chore(deps): lock file maintenance

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.generatelicensefile.json

@@ -1,6 +1,7 @@
 {
   "append": [
     "assets/fox.glb.license",
+    "assets/qwantani_afternoon_1k_hdr.jpg.license",
     "LICENSE"
   ],
   "replace": {

.github/dependabot.yml

@@ -1,20 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "pip"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-      day: "saturday"
-      time: "09:00"
-  - package-ecosystem: "npm"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-      day: "saturday"
-      time: "09:00"
-  - package-ecosystem: "github-actions"
-    directory: "/.github/workflows/"
-    schedule:
-      interval: "weekly"
-      day: "saturday"
-      time: "09:00"

.github/renovate.json5

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    ":disableDependencyDashboard"
+  ],
+  "automerge": true,
+  "automergeType": "branch",
+  "schedule": [ "* * * * 0,6" ],
+  "lockFileMaintenance": {
+    "enabled": true,
+    "schedule": [ "* * * * 0,6" ]
+  }
+}

.github/workflows/build.yml

@@ -0,0 +1,87 @@
+on:
+  push:
+  pull_request:
+  workflow_call:
+    inputs:
+      ref:
+        type: "string"
+        required: true
+        description: "The ref (branch or tag) to build"
+
+jobs:
+
+  build-frontend:
+    name: "Build frontend"
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v6"
+        with:
+          ref: "${{ inputs.ref }}"
+      - uses: "actions/setup-node@v6"
+        with:
+          cache: "yarn"
+      - run: "yarn install"
+      - run: "yarn build"
+      - uses: "actions/upload-artifact@v5"
+        with:
+          name: "frontend"
+          path: "dist"
+          retention-days: 5
+
+  build-backend:
+    name: "Build backend"
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v6"
+        with:
+          ref: "${{ inputs.ref }}"
+      - run: "pipx install poetry"
+      - uses: "actions/setup-python@v6"
+        with:
+          python-version: "3.13"
+          cache: "poetry"
+      - run: "poetry lock"
+      - run: "poetry install"
+      - run: "poetry build" # Skips building frontend (not using task)
+
+  build-logo:
+    name: "Build logo"
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v6"
+        with:
+          ref: "${{ inputs.ref }}"
+      - run: "pipx install poetry"
+      - uses: "actions/setup-python@v6"
+        with:
+          python-version: "3.13"
+          cache: "poetry"
+      - run: "poetry lock"
+      - run: "poetry install"
+      - run: "poetry run python yacv_server/logo.py"
+      - uses: "actions/upload-artifact@v5"
+        with:
+          name: "logo"
+          path: "assets/logo_build"
+          retention-days: 5
+
+  build-example:
+    name: "Build example"
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v6"
+        with:
+          ref: "${{ inputs.ref }}"
+      - run: "pipx install poetry"
+      - uses: "actions/setup-python@v6"
+        with:
+          python-version: "3.13"
+          cache: "poetry"
+      - run: "poetry lock"
+      - run: "poetry install"
+      - run: "YACV_DISABLE_SERVER=true poetry run python example/object.py"
+      - uses: "actions/upload-artifact@v5"
+        with:
+          name: "example"
+          path: "export"
+          retention-days: 5

.github/workflows/ci.yml

@@ -1,65 +0,0 @@
-name: "Continuous Integration"
-
-on:
-  push:
-    branches:
-      - "master"
-  pull_request:
-    branches:
-      - "master"
-
-jobs:
-
-  build-frontend:
-    name: "Build frontend"
-    runs-on: "ubuntu-latest"
-    steps:
-      - uses: "actions/checkout@v4"
-      - uses: "actions/setup-node@v4"
-        with:
-          cache: "yarn"
-      - run: "yarn install"
-      - run: "yarn build"
-      - uses: "actions/upload-artifact@v4"
-        with:
-          name: "frontend"
-          path: "./dist"
-          retention-days: 5
-
-  build-backend:
-    name: "Build backend"
-    runs-on: "ubuntu-latest"
-    steps:
-      - uses: "actions/checkout@v4"
-      - uses: "actions/setup-node@v4"
-        with:
-          cache: "yarn"
-      - run: "pipx install poetry"
-      - uses: "actions/setup-python@v5"
-        with:
-          python-version: "3.11"
-          cache: "poetry"
-      - run: "poetry install"
-      - run: "poetry build"
-
-  build-logo:
-    name: "Build logo"
-    runs-on: "ubuntu-latest"
-    steps:
-      - uses: "actions/checkout@v4"
-      - uses: "actions/setup-node@v4"
-        with:
-          cache: "yarn"
-      - run: "pipx install poetry"
-      - uses: "actions/setup-python@v5"
-        with:
-          python-version: "3.11"
-          cache: "poetry"
-      - run: "poetry install"
-      - run: "poetry run python yacv_server/logo.py"
-      - run: "cp assets/fox.glb assets/logo_build/fox.glb"
-      - uses: "actions/upload-artifact@v4"
-        with:
-          name: "logo"
-          path: "./assets/logo_build"
-          retention-days: 5

.github/workflows/deploy.yml

@@ -1,38 +0,0 @@
-name: "Deploy"
-
-on:
-  push:
-    tags:
-      - "v*"
-
-permissions:
-  contents: "write"
-
-jobs:
-  deploy:
-    concurrency: "ci-${{ github.ref }}" # Recommended if you intend to make multiple deployments in quick succession.
-    runs-on: "ubuntu-latest"
-    steps:
-      - uses: "actions/download-workflow-artifact@v3"
-        with:
-          workflow: "ci.yml"
-          name: "frontend"
-          path: "./public"
-      - uses: "actions/download-workflow-artifact@v3"
-        with:
-          workflow: "ci.yml"
-          name: "logo"
-          path: "./public"
-      - run: "ls -l -R ./public"
-      - uses: "JamesIves/github-pages-deploy-action@v4"
-        with:
-          folder: "public"
-      - uses: "svenstaro/upload-release-action@v2"
-        with:
-          repo_token: "${{ secrets.GITHUB_TOKEN }}"
-          file: "./public/*"
-          asset_name: "frontend"
-          tag: "${{ github.ref }}"
-          overwrite: true
-          file_glob: true
-

.github/workflows/deploy1.yml

@@ -0,0 +1,65 @@
+on:
+  push:
+    tags:
+      - "v**"
+
+permissions: # Same as deploy2.yml
+  contents: "write"
+  pages: "write"
+  id-token: "write"
+
+jobs:
+
+  update-versions:
+    runs-on: "ubuntu-latest"
+    outputs:
+      skip: "${{ steps.check_recursive.outputs.skip || 'false' }}" # Default to false if not set
+    steps:
+      - uses: "actions/checkout@v6"
+        with: # Ensure we are not in a detached HEAD state
+          ref: "master"
+          token: "${{ secrets.GH_PAT }}"
+      # Check that the tag commit is the latest master commit
+      - id: check_recursive
+        run: |
+          git fetch --tags
+          tag_commit=$(git rev-parse ${{ github.ref }})
+          master_commit=$(git rev-parse master)
+          if [ "$tag_commit" != "$master_commit" ]; then
+              echo "::warning ::The tag commit $tag_commit does not match the latest master commit $master_commit. This is probably a recursive tag push that will be ignored."
+              echo "skip=true" >> $GITHUB_OUTPUT
+          fi
+      - run: "echo 'CLEAN_VERSION=${{ github.ref }}' | sed 's,refs/tags/v,,g' >> $GITHUB_ENV"
+      # Write the new version to package.json
+      - uses: "actions/setup-node@v6"
+      - run: "yarn version --new-version $CLEAN_VERSION --no-git-tag-version"
+      # Write the new version to pyproject.toml
+      - run: "pipx install poetry"
+      - uses: "actions/setup-python@v6"
+        with:
+          python-version: "3.13"
+          cache: "poetry"
+      - run: "poetry version $CLEAN_VERSION"
+      # Commit the changes and move the tag!
+      - if: "steps.check_recursive.outputs.skip != 'true'"
+        run: |
+          git config --global user.email "yeicor@users.noreply.github.com"
+          git config --global user.name "Yeicor"
+          if git commit -am "Automatically update version to $CLEAN_VERSION"; then
+            git push
+            # Move the tag to the new commit
+            git tag -f -a "v$CLEAN_VERSION" -m "v$CLEAN_VERSION"
+            git push -f --tags # Force push the tag to GitHub
+            # The tag move will NOT trigger a new workflow
+          else
+            echo "No source change detected on version update (did you repeat a release tag??)"
+            exit 1
+          fi
+
+  deploy: # Makes sure all artifacts are updated and use the new version for the next deployment steps
+    needs: "update-versions"
+    if: "needs.update-versions.outputs.skip != 'true'" # Only run if the update-versions job did not skip
+    uses: "./.github/workflows/deploy2.yml"
+    secrets: "inherit" # Inherit the secrets from the parent workflow
+    with:
+      ref: "master"  # Ensure we are cloning the latest version of the repository

.github/workflows/deploy2.yml

@@ -0,0 +1,72 @@
+on:
+  workflow_call:
+    inputs:
+      ref:
+        type: "string"
+        required: true
+        description: "The ref (branch or tag) to build"
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: "write"
+  pages: "write"
+  id-token: "write"
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+
+  rebuild: # Makes sure all artifacts are updated and use the new version
+    uses: "./.github/workflows/build.yml"
+    with:
+      ref: "${{ inputs.ref }}"
+
+  deploy-frontend:
+    needs: "rebuild"
+    runs-on: "ubuntu-latest"
+    environment:
+      name: "github-pages"
+      url: "${{ steps.deployment.outputs.page_url }}"
+    steps:
+      - uses: "actions/download-artifact@v6"
+        with: # Downloads all artifacts from the build job
+          path: "./public"
+          merge-multiple: true
+      - uses: "actions/configure-pages@v5"
+      - uses: "actions/upload-pages-artifact@v4"
+        with:
+          path: 'public'
+      - id: "deployment"
+        uses: "actions/deploy-pages@v4"
+      - run: 'zip -r frontend.zip public'
+      - uses: "svenstaro/upload-release-action@v2"
+        with:
+          repo_token: "${{ secrets.GITHUB_TOKEN }}"
+          file: "frontend.zip"
+          tag: "${{ github.ref }}"
+          overwrite: true
+
+  deploy-backend:
+    needs: "rebuild"
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v6"
+        with:
+          ref: "${{ inputs.ref }}"
+      - uses: "actions/setup-node@v6"
+        with:
+          cache: "yarn"
+      - run: "pipx install poetry"
+      - uses: "actions/setup-python@v6"
+        with:
+          python-version: "3.13"
+          cache: "poetry"
+      - run: "poetry install"
+      - run: "poetry config pypi-token.pypi ${{ secrets.PYPI_TOKEN }}"
+      - run: "poetry run task build" # This task also builds the frontend (with reduced features for less size)
+      - run: "poetry publish"
+

.gitignore

@@ -11,3 +11,4 @@
 
 *.iml
 venv/
+__pycache__/

CONTRIBUTING.md

@@ -0,0 +1,15 @@
+# Contributing to Yet Another CAD Viewer
+
+Thank you for your interest in contributing to this project!
+
+## How to contribute
+
+- For **non-trivial changes** or new features, please [open an issue](https://github.com/yeicor-3d/yet-another-cad-viewer/issues) first to discuss your idea before submitting a pull request.
+- For **small fixes** (such as typo corrections or minor improvements), feel free to submit a pull request directly.
+
+## Pull requests
+
+- Make sure your changes are clear and concise.
+- Describe what your pull request does and reference any related issues.
+
+We appreciate your help in improving this project!

README.md

@@ -10,35 +10,32 @@ in a web browser.
 - All [GLTF 2.0](https://www.khronos.org/gltf/) features (textures, PBR materials, animations...).
 - All [model-viewer](https://modelviewer.dev/) features (smooth controls, augmented reality...).
 - Load multiple models at once, load external models and even images as quads.
+- Control clipping planes, transparency, edge/vertex sizes and explode each model.
 - View and interact with topological entities: faces, edges, vertices and locations.
-- Control clipping planes and transparency of each model.
 - Select any entity and measure bounding box size and distances.
-- Fully-featured [static deployment](#static-deployment): just upload the viewer and models to your server.
-- [Live lazy updates](#live-updates) while editing the CAD model (using the [yacv_server](yacv_server)).
+- Hot reloading while editing the CAD model (using the `yacv-server` package).
+- Fully-featured static deployment: just upload the viewer and models to your server.
+- Build123d playground! Code and build your model fully inside the
+  browser: [demo](https://yeicor-3d.github.io/yet-another-cad-viewer/#pg_code=https://raw.githubusercontent.com/gumyr/build123d/refs/heads/dev/examples/toy_truck.py).
 
-## Usage & demo
+## Usage
 
-The latest build is available at https://yeicor-3d.github.io/yet-another-cad-viewer/.
+The [example](example) is a fully working project that shows how to use the viewer.
 
-### Live updates
-
-To see the live updates you will need to run the [yacv_server](yacv_server) and
-open [the viewer](https://yeicor-3d.github.io/yet-another-cad-viewer/) with
-the `preloadModels=ws://<host>:32323/` query parameter (by default it already tries localhost).
-
-Note that [yacv_server](yacv_server) also hosts the frontend at `http://localhost:32323/` if you have no access to the
-internet.
-
-### Static deployment
-
-To deploy the viewer and models as a static website you can simply copy the latest build directory to your server.
-To load models use the `preloadModels=...` query parameter in the URL.
-It can be set multiple times to load multiple models.
-
-Note that you can simply reuse the [main deployment](https://yeicor-3d.github.io/yet-another-cad-viewer/) and host only
-your own models (linking them from the viewer with the `preloadModels` query parameter).
-
-To see a working example of a static deployment you can check out
-the [demo](https://yeicor-3d.github.io/yet-another-cad-viewer/?preloadModels=base.glb&preloadModels=fox.glb&preloadModels=img.jpg.glb&preloadModels=location.glb).
+You can play with the latest
+demo [here](https://yeicor-3d.github.io/yet-another-cad-viewer/?preload=logo.glb&preload=logo_hl.glb&preload=logo_hl_tex.glb&preload=fox.glb&preload=img.glb&preload=location.glb)
+(or
+[without animation](https://yeicor-3d.github.io/yet-another-cad-viewer/?autoplay=false&preload=logo.glb&preload=logo_hl.glb&preload=logo_hl_tex.glb&preload=fox.glb&preload=img.glb&preload=location.glb)).
 
 ![Demo](assets/screenshot.png)
+
+## Related projects
+
+- [cq-studio](https://github.com/ccazabon/cq-studio) provides an alternative workflow that detects file changes instead
+  of relying on an interactive environment like Jupyter for hot-reloading.
+  Uses the same backend and frontend behind the scenes.
+- [build123d-docker](https://github.com/derhuerst/build123d-docker/pkgs/container/build123d) provides docker images for
+  Yet Another CAD Viewer and other projects, with automatic updates.
+- [OCP.wasm](https://github.com/yeicor/OCP.wasm/) ports OCP (OpenCASCADE for Python) and supporting libraries to
+  WebAssembly, enabling full in-browser CAD model generation and manipulation. This powers the build123d playground
+  provided by this viewer.

assets/.gitignore

@@ -0,0 +1 @@
+/logo_build/

assets/qwantani_afternoon_1k_hdr.jpg.license

@@ -0,0 +1,2 @@
+CC0: Qwantani Afternoon by Greg Zaal (Photography) and Jarod Guest (Processing)
+https://polyhaven.com/a/qwantani_afternoon

build.py

@@ -1,7 +0,0 @@
-import os
-import subprocess
-
-if __name__ == "__main__":
-    # When building the backend, make sure the frontend is built first
-    subprocess.run(['yarn', 'install'], check=True)
-    subprocess.run(['yarn', 'build', '--outDir', 'yacv_server/frontend'], check=True)

example/.gitignore

@@ -0,0 +1,2 @@
+/venv/
+/export/

example/README.md

@@ -0,0 +1,40 @@
+# Quickstart of Yet Another CAD Viewer
+
+## Installation
+
+1. Download the contents of this folder.
+2. Assuming you have a recent version of Python 3 installed, install the required packages:
+
+```bash
+python -m venv venv
+. venv/bin/activate  # Execute this line every time you change the terminal
+pip install -r requirements.txt
+```
+
+## Usage
+
+### Development with hot-reloading
+
+To start the viewer, open the [GitHub Pages link](https://yeicor-3d.github.io/yet-another-cad-viewer/) of the frontend.
+It will try to connect to the server at `127.0.0.1:32323` by default (this can be changed with the `preload` query
+parameter).
+
+Running `python object.py` is enough to push the model to the viewer. However, the recommended way for developing with
+minimal latency is to run in cell mode (#%%). This way, the slow imports are only done once, and the server keeps
+running. After editing the file you can just re-run the cell with the `show_object` call to push the changes to
+the viewer.
+
+### Static final deployment
+
+Once your model is complete, you may want to share it with others using the same viewer.
+
+You can do so by exporting the model as a .glb file as a last step of your script.
+This is already done in `object.py` if the environment variable `CI` is set.
+
+Once you have the `object.glb` file, you can host it on any static file server and share the following link with others:
+`https://yeicor-3d.github.io/yet-another-cad-viewer/?preload=<link-to-object.glb>`
+
+For the example model, the build process is set up in [build.yml](../.github/workflows/build.yml), the upload process
+is set up in [deploy.yml](../.github/workflows/deploy.yml), and the final link is:
+https://yeicor-3d.github.io/yet-another-cad-viewer/?preload=example.glb&preload=example_hl.glb
+

example/object.py

@@ -0,0 +1,35 @@
+# Optional: enable logging to see what's happening
+import logging
+import os
+
+from build123d import *  # Also works with cadquery objects!
+from build123d import Compound
+
+logging.basicConfig(level=logging.DEBUG)
+
+from yacv_server import show, export_all  # Check out other exported methods for more features!
+
+# %%
+
+# Create a simple object
+with BuildPart() as example:
+    Box(10, 10, 5)
+    Cylinder(4, 5, mode=Mode.SUBTRACT)
+
+# Custom colors (optional)
+example.color = (0.1, 0.3, 0.1, 1)  # RGBA
+to_highlight = example.edges().group_by(Axis.Z)[-1]
+example_hl = Compound(to_highlight).translate((0, 0, 1e-3))  # To avoid z-fighting
+example_hl.color = (1, 1, .0, 1)
+
+# Show it in the frontend with hot-reloading (texture and other keyword arguments are optional)
+texture = (  # MIT License Framework7 Line Icons: https://www.svgrepo.com/svg/437552/checkmark-seal
+    "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASAQAAAAB+tbP6AAAAQ0lEQVQI12P4b3+A4Z/8AYYHBw8w"
+    "HHxwgOH8HyD+AsRPDjDMP+fAYD+fgcESiGfYOTCcqTnAcK4GogakFqQHpBdoBgAbGiPSbdzkhgAAAABJRU5ErkJggg==")
+show(example, example_hl, texture=texture)
+
+# %%
+
+# If running on CI, export the objects to .glb files for a static deployment
+if 'CI' in os.environ:
+    export_all('export')

example/requirements.txt

@@ -0,0 +1,2 @@
+build123d
+yacv-server

frontend/App.vue

@@ -1,17 +1,18 @@
 <!--suppress SillyAssignmentJS -->
-<script setup lang="ts">
-import {defineAsyncComponent, provide, type Ref, ref, shallowRef, triggerRef} from "vue";
+<script lang="ts" setup>
+import {defineAsyncComponent, provide, type Ref, ref, shallowRef, triggerRef, watch} from "vue";
 import Sidebar from "./misc/Sidebar.vue";
 import Loading from "./misc/Loading.vue";
 import Tools from "./tools/Tools.vue";
 import Models from "./models/Models.vue";
 import {VBtn, VLayout, VMain, VToolbarTitle} from "vuetify/lib/components/index.mjs";
 import {settings} from "./misc/settings";
-import {NetworkManager, NetworkUpdateEvent} from "./misc/network";
+import {NetworkManager, NetworkUpdateEvent, NetworkUpdateEventModel} from "./misc/network";
 import {SceneMgr} from "./misc/scene";
 import {Document} from "@gltf-transform/core";
 import type ModelViewerWrapperT from "./viewer/ModelViewerWrapper.vue";
-import {mdiPlus} from '@mdi/js'
+import {mdiCube, mdiPlus, mdiScriptTextPlay} from '@mdi/js'
+// @ts-expect-error
 import SvgIcon from '@jamescoyle/vue-icon';
 
 // NOTE: The ModelViewer library is big (THREE.js), so we split it and import it asynchronously
@@ -21,39 +22,115 @@ const ModelViewerWrapper = defineAsyncComponent({
   delay: 0,
 });
 
-let openSidebarsByDefault: Ref<boolean> = ref(window.innerWidth > 1200);
+let openSidebarsByDefault: Ref<boolean> = ref(window.innerWidth > window.innerHeight);
 
 const sceneUrl = ref("")
 const viewer: Ref<InstanceType<typeof ModelViewerWrapperT> | null> = ref(null);
 const sceneDocument = shallowRef(new Document());
 provide('sceneDocument', {sceneDocument});
 const models: Ref<InstanceType<typeof Models> | null> = ref(null)
+const tools: Ref<InstanceType<typeof Tools> | null> = ref(null)
 const disableTap = ref(false);
 const setDisableTap = (val: boolean) => disableTap.value = val;
 provide('disableTap', {disableTap, setDisableTap});
 
-async function onModelLoadRequest(model: NetworkUpdateEvent) {
-  sceneDocument.value = await SceneMgr.loadModel(sceneUrl, sceneDocument.value, model.name, model.url);
+async function onModelUpdateRequest(event: NetworkUpdateEvent) {
+  // Trigger progress bar as soon as possible (also triggered earlier for each raw notification)
+  if (viewer.value && event.models.length > 0) {
+    viewer.value.onProgress(0.10);
+  }
+  // Load/unload a new batch of models to optimize rendering time
+  console.log("Received model update request", event.models);
+  let shutdownRequestIndex = event.models.findIndex((model) => model.isRemove == null);
+  let shutdownRequest = null;
+  if (shutdownRequestIndex !== -1) {
+    console.log("Will shut down the connection after this load, as requested by the server");
+    shutdownRequest = event.models.splice(shutdownRequestIndex, 1)[0];
+  }
+  let doc = sceneDocument.value;
+  for (let modelIndex in event.models) {
+    let isLast = parseInt(modelIndex) === event.models.length - 1;
+    let model = event.models[modelIndex];
+    if (!model) continue;
+    tools.value?.removeObjectSelections(model.name);
+    try {
+      let loadHelpers = (await settings).loadHelpers;
+      if (!model.isRemove) {
+        doc = await SceneMgr.loadModel(sceneUrl, doc, model.name, model.url, isLast && loadHelpers, isLast);
+      } else {
+        doc = await SceneMgr.removeModel(sceneUrl, doc, model.name, isLast && loadHelpers, isLast);
+      }
+    } catch (e) {
+      console.error("Error loading model", model, e);
+    }
+  }
+  if (shutdownRequest !== null) {
+    console.log("Shutting down the connection as requested by the server");
+    event.disconnect();
+  }
+  sceneDocument.value = doc
   triggerRef(sceneDocument); // Why not triggered automatically?
 }
 
 async function onModelRemoveRequest(name: string) {
-  sceneDocument.value = await SceneMgr.removeModel(sceneUrl, sceneDocument.value, name);
-  triggerRef(sceneDocument); // Why not triggered automatically?
+  await onModelUpdateRequest(new NetworkUpdateEvent([new NetworkUpdateEventModel(name, "", null, true)], () => {
+  }));
 }
 
 // Set up the load model event listener
 let networkMgr = new NetworkManager();
-networkMgr.addEventListener('update', (e) => onModelLoadRequest(e as NetworkUpdateEvent));
-// Start loading all configured models ASAP
-for (let model of settings.preloadModels) {
-  networkMgr.load(model);
-}
+networkMgr.addEventListener('update-early',
+    (e) => viewer.value?.onProgress((e as CustomEvent<Array<any>>).detail.length * 0.01));
+networkMgr.addEventListener('update', (e) => onModelUpdateRequest(e as NetworkUpdateEvent));
+let preloadingModels = ref<Array<string>>([]);
+(async () => { // Start loading all configured models ASAP
+  let sett = await settings;
+  if (sett.preload.length > 0) {
+    watch(viewer, (newViewer) => {
+      if (newViewer) {
+        newViewer.setPosterText('<tspan x="50%" dy="1.2em">Trying to load' +
+            ' models from:</tspan>' + sett.preload.map((url: string) => '<tspan x="50%" dy="1.2em">- ' + url + '</tspan>').join(""));
+      }
+    });
+    for (let model of sett.preload) {
+      preloadingModels.value.push(model);
+      let removeFromPreloadingModels = () => {
+        preloadingModels.value = preloadingModels.value.filter((m) => m !== model);
+      };
+      networkMgr.load(model).then(removeFromPreloadingModels).catch((e) => {
+        removeFromPreloadingModels()
+        console.error("Error preloading model", model, e);
+      });
+    }
+  } // else No preloaded models (useful for playground mode)
+})();
 
 async function loadModelManual() {
   const modelUrl = prompt("For an improved experience in viewing CAD/GLTF models with automatic updates, it's recommended to use the official yacv_server Python package. This ensures seamless serving of models and automatic updates.\n\nOtherwise, enter the URL of the model to load:");
   if (modelUrl) await networkMgr.load(modelUrl);
 }
+
+function loadDemoModels() {
+  for (let name of ['fox.glb', 'img.glb', 'location.glb', 'logo.glb', 'logo_hl.glb', 'logo_hl_tex.glb']) {
+    networkMgr.load(`https://yeicor-3d.github.io/yet-another-cad-viewer/${name}`)
+  }
+}
+
+// Detect dropped .glb files and load them manually
+document.body.addEventListener("dragover", e => {
+  e.preventDefault(); // Allow drop
+});
+
+document.body.addEventListener("drop", async e => {
+  e.preventDefault();
+  const file = e.dataTransfer?.files?.[0];
+  if (!file) return;
+
+  const ext = file.name.split('.').pop()?.toLowerCase();
+  if (ext === 'glb' || ext === 'gltf') {
+    await networkMgr.load(file);
+  }
+});
 </script>
 
 <template>
@@ -61,28 +138,50 @@ async function loadModelManual() {
 
     <!-- The main content of the app is the model-viewer with the SVG "2D" overlay -->
     <v-main id="main">
-      <model-viewer-wrapper ref="viewer" :src="sceneUrl"/>
+      <model-viewer-wrapper v-if="sceneDocument.getRoot().listMeshes().length > 0" ref="viewer" :src="sceneUrl"/>
+      <!-- A nice no model loaded alternative to avoid breaking model-viewer-wrapper -->
+      <div v-else style="height: 100%; overflow-y: auto">
+        <v-toolbar-title class="text-center ma-16 text-h5">No model loaded</v-toolbar-title>
+        <v-btn @click="() => tools?.openPlayground()" class="mx-auto d-block my-4">
+          <svg-icon :path="mdiScriptTextPlay" type="mdi"/>&nbsp; Open playground...
+        </v-btn>
+        <v-btn @click="loadDemoModels" class="mx-auto d-block my-4">
+          <svg-icon :path="mdiCube" type="mdi"/>&nbsp; Load demo models...
+        </v-btn>
+        <v-btn @click="loadModelManual" class="mx-auto d-block my-4">
+          <svg-icon :path="mdiPlus" type="mdi"/>&nbsp; Load model manually...
+        </v-btn>
+        <span v-if="preloadingModels.length > 0" class="d-block text-center my-16">
+          <span class="d-block text-center text-h6">Still trying to load the following:</span>
+          <span class="d-block text-center" v-for="(model, index) in preloadingModels" :key="index">
+            <template v-if="model !== undefined">
+              {{ model }}<span v-if="index < preloadingModels.length - 1">, </span>
+            </template>
+          </span>
+        </span>
+
+      </div>
     </v-main>
 
     <!-- The left collapsible sidebar has the list of models -->
-    <sidebar :opened-init="openSidebarsByDefault" side="left" :width="300">
+    <sidebar :opened-init="openSidebarsByDefault" :width="300" side="left">
       <template #toolbar>
         <v-toolbar-title>Models</v-toolbar-title>
       </template>
       <template #toolbar-items>
         <v-btn icon="" @click="loadModelManual">
-          <svg-icon type="mdi" :path="mdiPlus"/>
+          <svg-icon :path="mdiPlus" type="mdi"/>
         </v-btn>
       </template>
-      <models ref="models" :viewer="viewer" @remove="onModelRemoveRequest"/>
+      <models ref="models" :viewer="viewer" @remove-model="onModelRemoveRequest"/>
     </sidebar>
 
     <!-- The right collapsible sidebar has the list of tools -->
-    <sidebar :opened-init="openSidebarsByDefault" side="right" :width="48 * 3 /* buttons */ + 1 /* border? */">
+    <sidebar :opened-init="openSidebarsByDefault" :width="48 * 3 /* buttons */ + 1 /* border? */" side="right">
       <template #toolbar>
         <v-toolbar-title>Tools</v-toolbar-title>
       </template>
-      <tools :viewer="viewer" @findModel="(name) => models?.findModel(name)"/>
+      <tools ref="tools" :viewer="viewer" @find-model="models?.findModel" @update-model="onModelUpdateRequest"/>
     </sidebar>
 
   </v-layout>
@@ -92,6 +191,6 @@ async function loadModelManual() {
 <style>
 html, body {
   height: 100%;
-  overflow: hidden;
+  overflow: hidden !important;
 }
-</style>
+</style>

frontend/index.ts

@@ -5,6 +5,12 @@ import {createVuetify} from 'vuetify';
 import * as directives from 'vuetify/lib/directives/index.mjs';
 import 'vuetify/dist/vuetify.css';
 
+// @ts-ignore
+if (__APP_NAME__) {
+    // @ts-ignore
+    console.log(`Starting ${__APP_NAME__} v${__APP_VERSION__} (${__APP_GIT_SHA__}${__APP_GIT_DIRTY__ ? "+dirty" : ""})...`);
+}
+
 const vuetify = createVuetify({
     directives,
     theme: {

frontend/misc/IfNotSmallBuild.vue

@@ -0,0 +1,31 @@
+<script setup lang="ts">
+import {mdiLockQuestion} from "@mdi/js";
+import {VBtn, VTooltip} from "vuetify/lib/components/index.mjs";
+// @ts-expect-error
+import SvgIcon from "@jamescoyle/vue-icon";
+
+// @ts-expect-error
+let isSmallBuild = typeof __YACV_SMALL_BUILD__ !== 'undefined' && __YACV_SMALL_BUILD__;
+
+function clickedButton() { // Redirect to the main build
+  window.open("https://yeicor-3d.github.io/yet-another-cad-viewer/" + window.location.search + window.location.hash, '_blank');
+}
+</script>
+
+<template>
+  <!--  @ts-ignore-->
+  <!-- Include the children as this is a full build -->
+  <slot v-if="!isSmallBuild"/>
+  <!-- A small info button saying that a feature is missing, and linking to the main build -->
+  <v-btn v-else icon @click="clickedButton" base-color="#a00" style="margin: auto; display: block;">
+    <v-tooltip activator="parent">
+      This feature is not available in the small build.<br/>
+      Click to go to the main build.
+    </v-tooltip>
+    <svg-icon :path="mdiLockQuestion" type="mdi"/>
+  </v-btn>
+</template>
+
+<style scoped>
+
+</style>

frontend/misc/Loading.vue

@@ -1,12 +1,13 @@
-<script setup lang="ts">
-import {VContainer, VRow, VCol, VProgressCircular} from "vuetify/lib/components/index.mjs";
+<script lang="ts" setup>
+import {VCol, VContainer, VProgressCircular, VRow} from "vuetify/lib/components/index.mjs";
 </script>
 
 <template>
   <v-container>
     <v-row justify="center" style="height: 100%">
       <v-col align-self="center">
-        <v-progress-circular indeterminate style="display: block; margin: 0 auto;"/>
+        <v-progress-circular indeterminate style="display: block; margin: 0 auto;"></v-progress-circular>
+        <slot/>
       </v-col>
     </v-row>
   </v-container>

frontend/misc/Sidebar.vue

@@ -1,7 +1,8 @@
-<script setup lang="ts">
+<script lang="ts" setup>
 import {ref} from "vue";
 import {VBtn, VNavigationDrawer, VToolbar, VToolbarItems} from "vuetify/lib/components/index.mjs";
 import {mdiChevronLeft, mdiChevronRight, mdiClose} from '@mdi/js'
+// @ts-expect-error
 import SvgIcon from '@jamescoyle/vue-icon';
 
 const props = defineProps<{
@@ -16,22 +17,22 @@ const openIcon = props.side === 'left' ? mdiChevronRight : mdiChevronLeft;
 </script>
 
 <template>
-  <v-btn icon @click="opened = !opened" class="open-button" :class="side">
-    <svg-icon type="mdi" :path="openIcon"/>
+  <v-btn :class="side" class="open-button" icon @click="opened = !opened">
+    <svg-icon :path="openIcon" type="mdi"/>
   </v-btn>
-  <v-navigation-drawer v-model="opened" permanent :location="side" :width="props.width">
+  <v-navigation-drawer v-model="opened" :location="side" :width="props.width" permanent>
     <v-toolbar density="compact">
       <v-toolbar-items v-if="side == 'right'">
         <slot name="toolbar-items"></slot>
         <v-btn icon @click="opened = !opened">
-          <svg-icon type="mdi" :path="mdiClose"/>
+          <svg-icon :path="mdiClose" type="mdi"/>
         </v-btn>
       </v-toolbar-items>
       <slot name="toolbar"></slot>
       <v-toolbar-items v-if="side == 'left'">
         <slot name="toolbar-items"></slot>
         <v-btn icon @click="opened = !opened">
-          <svg-icon type="mdi" :path="mdiClose"/>
+          <svg-icon :path="mdiClose" type="mdi"/>
         </v-btn>
       </v-toolbar-items>
     </v-toolbar>

frontend/misc/distances.ts

@@ -1,77 +1,88 @@
-import {BufferAttribute, InterleavedBufferAttribute, Vector3} from 'three';
-import type {MObject3D} from "../tools/Selection.vue";
-import type { ModelScene } from '@google/model-viewer/lib/three-components/ModelScene';
+import { BufferAttribute, InterleavedBufferAttribute, Vector3 } from "three";
+import type { MObject3D } from "../tools/Selection.vue";
+import type { ModelScene } from "@google/model-viewer/lib/three-components/ModelScene";
+import type { SelectionInfo } from "../tools/selection";
 
-
-function getCenterAndVertexList(obj: MObject3D, scene: ModelScene): {
-    center: Vector3,
-    vertices: Array<Vector3>
+function getCenterAndVertexList(
+  selInfo: SelectionInfo,
+  scene: ModelScene,
+): {
+  center: Vector3;
+  vertices: Array<Vector3>;
 } {
-    obj.updateMatrixWorld();
-    let pos: BufferAttribute | InterleavedBufferAttribute = obj.geometry.getAttribute('position');
-    let ind: BufferAttribute | null = obj.geometry.index;
-    if (!ind) {
-        ind = new BufferAttribute(new Uint16Array(pos.count), 1);
-        for (let i = 0; i < pos.count; i++) {
-            ind.array[i] = i;
-        }
+  if (!selInfo.object?.geometry) {
+    throw new Error("selInfo.object or geometry is undefined");
+  }
+  let pos = selInfo.object.geometry.getAttribute("position");
+  let ind = selInfo.object.geometry.index;
+  if (ind === null) {
+    ind = new BufferAttribute(new Uint16Array(pos.count), 1);
+    for (let i = 0; i < pos.count; i++) {
+      ind.array[i] = i;
     }
-    let center = new Vector3();
-    let vertices = [];
-    for (let i = 0; i < ind.count; i++) {
-        let index = ind.array[i];
-        let vertex = new Vector3(pos.getX(index), pos.getY(index), pos.getZ(index));
-        vertex = scene.target.worldToLocal(obj.localToWorld(vertex));
-        center.add(vertex);
-        vertices.push(vertex);
-    }
-    center = center.divideScalar(ind.count);
-    console.log("center", center)
-    return {center, vertices};
+  }
+  let center = new Vector3();
+  let vertices = [];
+  for (let i = selInfo.indices[0]; i < selInfo.indices[1]; i++) {
+    let index = ind.getX(i);
+    let vertex = new Vector3(pos.getX(index), pos.getY(index), pos.getZ(index));
+    vertex = scene.target.worldToLocal(selInfo.object.localToWorld(vertex));
+    center.add(vertex);
+    vertices.push(vertex);
+  }
+  center = center.divideScalar(selInfo.indices[1] - selInfo.indices[0]);
+  return { center, vertices };
 }
 
 /**
  * Given two THREE.Object3D objects, returns their closest and farthest vertices, and the geometric centers.
  * All of them are approximated and should not be used for precise calculations.
  */
-export function distances(a: MObject3D, b: MObject3D, scene: ModelScene): {
-    min: Array<Vector3>,
-    center: Array<Vector3>,
-    max: Array<Vector3>
+export function distances(
+  a: SelectionInfo,
+  b: SelectionInfo,
+  scene: ModelScene,
+): {
+  min: Array<Vector3>;
+  center: Array<Vector3>;
+  max: Array<Vector3>;
 } {
-    // Simplify this problem (approximate) by using the distance between each of their vertices.
-    // Find the center of each object.
-    let {center: aCenter, vertices: aVertices} = getCenterAndVertexList(a, scene);
-    let {center: bCenter, vertices: bVertices} = getCenterAndVertexList(b, scene);
+  // Simplify this problem (approximate) by using the distance between each of their vertices.
+  // Find the center of each object.
+  let { center: aCenter, vertices: aVertices } = getCenterAndVertexList(a, scene);
+  let { center: bCenter, vertices: bVertices } = getCenterAndVertexList(b, scene);
 
-    // Find the closest and farthest vertices.
-    // TODO: Compute actual min and max distances between the two objects.
-    // FIXME: Working for points and lines, but not triangles...
-    // FIXME: Really slow... (use a BVH or something)
-    let minDistance = Infinity;
-    let minDistanceVertices = [new Vector3(), new Vector3()];
-    let maxDistance = -Infinity;
-    let maxDistanceVertices = [new Vector3(), new Vector3()];
-    for (let i = 0; i < aVertices.length; i++) {
-        for (let j = 0; j < bVertices.length; j++) {
-            let distance = aVertices[i].distanceTo(bVertices[j]);
-            if (distance < minDistance) {
-                minDistance = distance;
-                minDistanceVertices[0] = aVertices[i];
-                minDistanceVertices[1] = bVertices[j];
-            }
-            if (distance > maxDistance) {
-                maxDistance = distance;
-                maxDistanceVertices[0] = aVertices[i];
-                maxDistanceVertices[1] = bVertices[j];
-            }
+  // Find the closest and farthest vertices.
+  // TODO: Compute actual min and max distances between the two objects.
+  // FIXME: Really slow... (use a BVH or something)
+  let minDistance = Infinity;
+  let minDistanceVertices = [new Vector3(), new Vector3()];
+  let maxDistance = -Infinity;
+  let maxDistanceVertices = [new Vector3(), new Vector3()];
+  for (let i = 0; i < aVertices.length; i++) {
+    for (let j = 0; j < bVertices.length; j++) {
+      const aVertex = aVertices[i];
+      const bVertex = bVertices[j];
+      if (aVertex && bVertex) {
+        let distance = aVertex.distanceTo(bVertex);
+        if (distance < minDistance) {
+          minDistance = distance;
+          minDistanceVertices[0] = aVertex;
+          minDistanceVertices[1] = bVertex;
         }
+        if (distance > maxDistance) {
+          maxDistance = distance;
+          maxDistanceVertices[0] = aVertex;
+          maxDistanceVertices[1] = bVertex;
+        }
+      }
     }
+  }
 
-    // Return the results.
-    return {
-        min: minDistanceVertices,
-        center: [aCenter, bCenter],
-        max: maxDistanceVertices
-    };
-}
+  // Return the results.
+  return {
+    min: minDistanceVertices,
+    center: [aCenter, bCenter],
+    max: maxDistanceVertices,
+  };
+}

frontend/misc/gltf.ts

@@ -1,10 +1,14 @@
-import {Document, Scene, type Transform, WebIO, Buffer} from "@gltf-transform/core";
-import {unpartition} from "@gltf-transform/functions";
+import { Buffer, Document, Scene, type Transform, WebIO } from "@gltf-transform/core";
+import { mergeDocuments, unpartition } from "@gltf-transform/functions";
+import { retrieveFile } from "../tools/upload-file.ts";
 
 let io = new WebIO();
 export let extrasNameKey = "__yacv_name";
 export let extrasNameValueHelpers = "__helpers";
 
+// @ts-expect-error
+let isSmallBuild = typeof __YACV_SMALL_BUILD__ !== "undefined" && __YACV_SMALL_BUILD__;
+
 /**
  * Loads a GLB model from a URL and adds it to the document or replaces it if the names match.
  *
@@ -12,71 +16,148 @@ export let extrasNameValueHelpers = "__helpers";
  *
  * Remember to call mergeFinalize after all models have been merged (slower required operations).
  */
-export async function mergePartial(url: string, name: string, document: Document): Promise<Document> {
-    // Load the new document
-    let newDoc = await io.read(url);
+export async function mergePartial(
+  url: string | Blob,
+  name: string,
+  document: Document,
+  networkFinished: () => void = () => {},
+): Promise<Document> {
+  // Fetch the complete document from the network
+  // This could be done at the same time as the document is being processed, but I wanted better metrics
+  let response = await fetchOrRead(url);
+  let buffer = await response.arrayBuffer();
+  networkFinished();
 
-    // Remove any previous model with the same name
-    await document.transform(dropByName(name));
+  // Load the new document
+  let newDoc = null;
+  let alreadyTried: { [name: string]: boolean } = {};
+  while (newDoc == null) {
+    // Retry adding extensions as required until the document is loaded
+    try {
+      // Try to load fast if no extensions are used
+      newDoc = await io.readBinary(new Uint8Array(buffer));
+    } catch (e) {
+      // Fallback to wait for download and register big extensions
+      if (!isSmallBuild && e instanceof Error && e.message.toLowerCase().includes("khr_draco_mesh_compression")) {
+        if (alreadyTried["draco"]) throw e;
+        else alreadyTried["draco"] = true;
+        // WARNING: Draco decompression on web is really slow for non-trivial models! (it should work?)
+        let { KHRDracoMeshCompression } = await import("@gltf-transform/extensions");
+        // @ts-expect-error
+        let dracoDecoderWeb = await import("three/examples/jsm/libs/draco/draco_decoder.js");
+        // @ts-expect-error
+        let dracoEncoderWeb = await import("three/examples/jsm/libs/draco/draco_encoder.js");
+        io.registerExtensions([KHRDracoMeshCompression]).registerDependencies({
+          "draco3d.decoder": await dracoDecoderWeb.default({}),
+          "draco3d.encoder": await dracoEncoderWeb.default({}),
+        });
+      } else if (!isSmallBuild && e instanceof Error && e.message.toLowerCase().includes("ext_texture_webp")) {
+        if (alreadyTried["webp"]) throw e;
+        else alreadyTried["webp"] = true;
+        let { EXTTextureWebP } = await import("@gltf-transform/extensions");
+        io.registerExtensions([EXTTextureWebP]);
+      } else {
+        // TODO: Add more extensions as required
+        throw e;
+      }
+    }
+  }
 
-    // Ensure consistent names
-    // noinspection TypeScriptValidateJSTypes
-    await newDoc.transform(setNames(name));
+  // Remove any previous model with the same name
+  await document.transform(dropByName(name));
 
-    // Merge the new document into the current one
-    return document.merge(newDoc);
+  // Ensure consistent names
+  // noinspection TypeScriptValidateJSTypes
+  await newDoc.transform(setNames(name));
+
+  // Merge the new document into the current one
+  mergeDocuments(document, newDoc);
+  return document;
 }
 
 export async function mergeFinalize(document: Document): Promise<Document> {
-    // Single scene & buffer required before loading & rendering
-    return await document.transform(mergeScenes(), unpartition());
+  // Single scene & buffer required before loading & rendering
+  return await document.transform(mergeScenes(), unpartition());
 }
 
 export async function toBuffer(doc: Document): Promise<Uint8Array> {
-    return io.writeBinary(doc);
+  return io.writeBinary(doc);
 }
 
 export async function removeModel(name: string, document: Document): Promise<Document> {
-    return await document.transform(dropByName(name));
+  return await document.transform(dropByName(name));
 }
 
 /** Given a parsed GLTF document and a name, it forces the names of all elements to be identified by the name (or derivatives) */
 function setNames(name: string): Transform {
-    return (doc: Document) => {
-        // Do this automatically for all elements changing any name
-        for (let elem of doc.getGraph().listEdges().map(e => e.getChild())) {
-            if (!elem.getExtras()) elem.setExtras({});
-            elem.getExtras()[extrasNameKey] = name;
-        }
-        return doc;
+  return (doc: Document) => {
+    // Do this automatically for all elements changing any name
+    for (let elem of doc
+      .getGraph()
+      .listEdges()
+      .map((e) => e.getChild())) {
+      if (!elem.getExtras()) elem.setExtras({});
+      elem.getExtras()[extrasNameKey] = name;
     }
+    return doc;
+  };
 }
 
 /** Ensures that all elements with the given name are removed from the document */
 function dropByName(name: string): Transform {
-    return (doc: Document) => {
-        for (let elem of doc.getGraph().listEdges().map(e => e.getChild())) {
-            if (elem.getExtras() == null || elem instanceof Scene || elem instanceof Buffer) continue;
-            if ((elem.getExtras()[extrasNameKey]?.toString() ?? "") == name) {
-                elem.dispose();
-            }
-        }
-        return doc;
-    };
+  return (doc: Document) => {
+    for (let elem of doc
+      .getGraph()
+      .listEdges()
+      .map((e) => e.getChild())) {
+      if (elem.getExtras() == null || elem instanceof Scene || elem instanceof Buffer) continue;
+      if ((elem.getExtras()[extrasNameKey]?.toString() ?? "") == name) {
+        elem.dispose();
+      }
+    }
+    return doc;
+  };
 }
 
-
 /** Merges all scenes in the document into a single default scene */
 function mergeScenes(): Transform {
-    return (doc: Document) => {
-        let root = doc.getRoot();
-        let scene = root.getDefaultScene() ?? root.listScenes()[0];
-        for (let dropScene of root.listScenes()) {
-            if (dropScene === scene) continue;
-            for (let node of dropScene.listChildren()) {
-                scene.addChild(node);
-            }
-            dropScene.dispose();
-        }
+  return (doc: Document) => {
+    let root = doc.getRoot();
+    let scene = root.getDefaultScene() ?? root.listScenes()[0];
+    if (!scene) {
+      throw new Error("No scene found in GLTF document");
     }
+    for (let dropScene of root.listScenes()) {
+      if (dropScene === scene) continue;
+      for (let node of dropScene.listChildren()) {
+        scene.addChild(node);
+      }
+      dropScene.dispose();
+    }
+  };
+}
+
+/** Fetches a URL or reads it if it is a Blob URL */
+async function fetchOrRead(url: string | Blob) {
+  if (url instanceof Blob) {
+    // Use the FileReader API as fetch does not support Blob URLs
+    return new Promise<Response>((resolve, reject) => {
+      const reader = new FileReader();
+      reader.onloadend = (event: ProgressEvent<FileReader>) => {
+        if (event.target && event.target.result) {
+          resolve(new Response(event.target.result));
+        } else {
+          reject(new Error("Failed to read Blob URL: " + url));
+        }
+      };
+      reader.onerror = (error) => {
+        reject(new Error("Error reading Blob URL: " + url + " - " + error));
+      };
+      // Read the Blob URL as an ArrayBuffer
+      reader.readAsArrayBuffer(new Blob([url]));
+    });
+  } else {
+    // Fetch the URL
+    return retrieveFile(url);
+  }
 }

frontend/misc/helpers.ts

@@ -1,68 +1,112 @@
-import {Document, type TypedArray} from '@gltf-transform/core'
-import {Vector2} from "three/src/math/Vector2.js"
-import {Vector3} from "three/src/math/Vector3.js"
-import {Matrix4} from "three/src/math/Matrix4.js"
+// noinspection JSVoidFunctionReturnValueUsed,JSUnresolvedReference
 
+import { Document, type TypedArray } from "@gltf-transform/core";
+import { Vector2 } from "three/src/math/Vector2.js";
+import { Vector3 } from "three/src/math/Vector3.js";
+import { Matrix4 } from "three/src/math/Matrix4.js";
 
 /** Exports the colors used for the axes, primary and secondary. They match the orientation gizmo. */
 export const AxesColors = {
-    x: [[247, 60, 60], [148, 36, 36]],
-    z: [[108, 203, 38], [65, 122, 23]],
-    y: [[23, 140, 240], [14, 84, 144]]
-}
+  x: [
+    [247, 60, 60],
+    [148, 36, 36],
+  ],
+  z: [
+    [108, 203, 38],
+    [65, 122, 23],
+  ],
+  y: [
+    [23, 140, 240],
+    [14, 84, 144],
+  ],
+};
 
-function buildSimpleGltf(doc: Document, rawPositions: number[], rawIndices: number[], rawColors: number[] | null, transform: Matrix4, name: string = '__helper', mode: number = WebGL2RenderingContext.LINES) {
-    const buffer = doc.getRoot().listBuffers()[0] ?? doc.createBuffer(name + 'Buffer')
-    const scene = doc.getRoot().getDefaultScene() ?? doc.getRoot().listScenes()[0] ?? doc.createScene(name + 'Scene')
-    const positions = doc.createAccessor(name + 'Position')
-        .setArray(new Float32Array(rawPositions) as TypedArray)
-        .setType('VEC3')
-        .setBuffer(buffer)
-    const indices = doc.createAccessor(name + 'Indices')
-        .setArray(new Uint32Array(rawIndices) as TypedArray)
-        .setType('SCALAR')
-        .setBuffer(buffer)
-    let colors = null;
-    if (rawColors) {
-        colors = doc.createAccessor(name + 'Color')
-            .setArray(new Float32Array(rawColors) as TypedArray)
-            .setType('VEC3')
-            .setBuffer(buffer);
-    }
-    const material = doc.createMaterial(name + 'Material')
-        .setAlphaMode('OPAQUE')
-    const geometry = doc.createPrimitive()
-        .setIndices(indices)
-        .setAttribute('POSITION', positions)
-        .setMode(mode as any)
-        .setMaterial(material)
-    if (rawColors) {
-        geometry.setAttribute('COLOR_0', colors)
-    }
-    const mesh = doc.createMesh(name + 'Mesh').addPrimitive(geometry)
-    const node = doc.createNode(name + 'Node').setMesh(mesh).setMatrix(transform.elements as any)
-    scene.addChild(node)
+function buildSimpleGltf(
+  doc: Document,
+  rawPositions: number[],
+  rawIndices: number[],
+  rawColors: number[] | null,
+  transform: Matrix4,
+  name: string = "__helper",
+  mode: number = WebGL2RenderingContext.LINES,
+) {
+  const buffer = doc.getRoot().listBuffers()[0] ?? doc.createBuffer(name + "Buffer");
+  const scene = doc.getRoot().getDefaultScene() ?? doc.getRoot().listScenes()[0] ?? doc.createScene(name + "Scene");
+  if (!scene) throw new Error("Scene is undefined");
+  if (!rawPositions) throw new Error("rawPositions is undefined");
+  const positions = doc
+    .createAccessor(name + "Position")
+    .setArray(new Float32Array(rawPositions) as TypedArray)
+    .setType("VEC3")
+    .setBuffer(buffer);
+  const indices = doc
+    .createAccessor(name + "Indices")
+    .setArray(new Uint32Array(rawIndices) as TypedArray)
+    .setType("SCALAR")
+    .setBuffer(buffer);
+  let colors = null;
+  if (rawColors) {
+    colors = doc
+      .createAccessor(name + "Color")
+      .setArray(new Float32Array(rawColors) as TypedArray)
+      .setType("VEC4")
+      .setBuffer(buffer);
+  }
+  const material = doc.createMaterial(name + "Material").setAlphaMode("OPAQUE");
+  const geometry = doc
+    .createPrimitive()
+    .setIndices(indices)
+    .setAttribute("POSITION", positions)
+    .setMode(mode as any)
+    .setMaterial(material);
+  if (rawColors) {
+    geometry.setAttribute("COLOR_0", colors);
+  }
+  if (mode == WebGL2RenderingContext.TRIANGLES) {
+    geometry.setExtras({
+      face_triangles_end: [
+        rawIndices.length / 6,
+        (rawIndices.length * 2) / 6,
+        (rawIndices.length * 3) / 6,
+        (rawIndices.length * 4) / 6,
+        (rawIndices.length * 5) / 6,
+        rawIndices.length,
+      ],
+    });
+  } else if (mode == WebGL2RenderingContext.LINES) {
+    geometry.setExtras({ edge_points_end: [rawIndices.length / 3, (rawIndices.length * 2) / 3, rawIndices.length] });
+  }
+  const mesh = doc.createMesh(name + "Mesh").addPrimitive(geometry);
+  const node = doc
+    .createNode(name + "Node")
+    .setMesh(mesh)
+    .setMatrix(transform.elements as any);
+  scene.addChild(node);
 }
 
 /**
  * Create a new Axes helper as a GLTF model, useful for debugging positions and orientations.
  */
 export function newAxes(doc: Document, size: Vector3, transform: Matrix4) {
-    let rawPositions = [
-        [0, 0, 0, size.x, 0, 0],
-        [0, 0, 0, 0, size.y, 0],
-        [0, 0, 0, 0, 0, -size.z],
-    ];
-    let rawIndices = [0, 1];
-    let rawColors = [
-        [...(AxesColors.x[0]), ...(AxesColors.x[1])],
-        [...(AxesColors.y[0]), ...(AxesColors.y[1])],
-        [...(AxesColors.z[0]), ...(AxesColors.z[1])],
-    ].map(g => g.map(x => x / 255.0));
-    buildSimpleGltf(doc, rawPositions[0], rawIndices, rawColors[0], transform, '__helper_axes');
-    buildSimpleGltf(doc, rawPositions[1], rawIndices, rawColors[1], transform, '__helper_axes');
-    buildSimpleGltf(doc, rawPositions[2], rawIndices, rawColors[2], transform, '__helper_axes');
-    buildSimpleGltf(doc, [0, 0, 0], [0], null, transform, '__helper_axes', WebGL2RenderingContext.POINTS);
+  let rawIndices = [0, 1, 2, 3, 4, 5];
+  let rawPositions = [0, 0, 0, size.x, 0, 0, 0, 0, 0, 0, size.y, 0, 0, 0, 0, 0, 0, -size.z];
+  let rawColors = [
+    ...(AxesColors.x[0] ?? [255, 0, 0]),
+    255,
+    ...(AxesColors.x[1] ?? [255, 0, 0]),
+    255,
+    ...(AxesColors.y[0] ?? [0, 255, 0]),
+    255,
+    ...(AxesColors.y[1] ?? [0, 255, 0]),
+    255,
+    ...(AxesColors.z[0] ?? [0, 0, 255]),
+    255,
+    ...(AxesColors.z[1] ?? [0, 0, 255]),
+    255,
+  ].map((x) => x / 255.0);
+  // Axes at (0, 0, 0)
+  buildSimpleGltf(doc, rawPositions, rawIndices, rawColors, new Matrix4(), "__helper_axes");
+  buildSimpleGltf(doc, [0, 0, 0], [0], [1, 1, 1, 1], new Matrix4(), "__helper_axes", WebGL2RenderingContext.POINTS);
 }
 
 /**
@@ -71,48 +115,62 @@ export function newAxes(doc: Document, size: Vector3, transform: Matrix4) {
  * The grid is built as a box of triangles (representing lines) looking to the inside of the box.
  * This ensures that only the back of the grid is always visible, regardless of the camera position.
  */
-export function newGridBox(doc: Document, size: Vector3, baseTransform: Matrix4 = new Matrix4(), divisions = 10) {
-    // Create transformed positions for the inner faces of the box
-    for (let axis of [new Vector3(1, 0, 0), new Vector3(0, 1, 0), new Vector3(0, 0, -1)]) {
-        for (let positive of [1, -1]) {
-            let offset = axis.clone().multiply(size.clone().multiplyScalar(0.5 * positive));
-            let translation = new Matrix4().makeTranslation(offset.x, offset.y, offset.z)
-            let rotation = new Matrix4().lookAt(new Vector3(), offset, new Vector3(0, 1, 0))
-            let size2 = new Vector2();
-            if (axis.x) size2.set(size.z, size.y);
-            if (axis.y) size2.set(size.x, size.z);
-            if (axis.z) size2.set(size.x, size.y);
-            let transform = baseTransform.clone().multiply(translation).multiply(rotation);
-            newGridPlane(doc, size2, transform, divisions);
-        }
+export function newGridBox(doc: Document, size: Vector3, baseTransform: Matrix4, divisions = 10) {
+  // Create transformed positions for the inner faces of the box
+  let allPositions: number[] = [];
+  let allIndices: number[] = [];
+  for (let axis of [new Vector3(1, 0, 0), new Vector3(0, 1, 0), new Vector3(0, 0, -1)]) {
+    for (let positive of [1, -1]) {
+      let offset = axis.clone().multiply(size.clone().multiplyScalar(0.5 * positive));
+      let translation = new Matrix4().makeTranslation(offset.x, offset.y, offset.z);
+      let rotation = new Matrix4().lookAt(new Vector3(), offset, new Vector3(0, 1, 0));
+      let size2 = new Vector2();
+      if (axis.x) size2.set(size.z, size.y);
+      if (axis.y) size2.set(size.x, size.z);
+      if (axis.z) size2.set(size.x, size.y);
+      let transform = new Matrix4().multiply(translation).multiply(rotation);
+      let [rawPositions, rawIndices] = newGridPlane(size2, divisions);
+      let baseIndex = allPositions.length / 3;
+      for (let i of rawIndices) {
+        allIndices.push(i + baseIndex);
+      }
+      // Apply transform to the positions before adding them to the list
+      for (let i = 0; i < rawPositions.length; i += 3) {
+        let pos = new Vector3(rawPositions[i], rawPositions[i + 1], rawPositions[i + 2]);
+        pos.applyMatrix4(transform);
+        allPositions.push(pos.x, pos.y, pos.z);
+      }
     }
+  }
+  let colors = new Array((allPositions.length / 3) * 4).fill(1);
+  buildSimpleGltf(doc, allPositions, allIndices, colors, baseTransform, "__helper_grid", WebGL2RenderingContext.TRIANGLES);
 }
 
-export function newGridPlane(doc: Document, size: Vector2, transform: Matrix4 = new Matrix4(), divisions = 10, divisionWidth = 0.002) {
-    const rawPositions = [];
-    const rawIndices = [];
-    // Build the grid as triangles
-    for (let i = 0; i <= divisions; i++) {
-        const x = -size.x / 2 + size.x * i / divisions;
-        const y = -size.y / 2 + size.y * i / divisions;
+export function newGridPlane(size: Vector2, divisions = 10, divisionWidth = 0.002): [number[], number[]] {
+  const rawPositions = [];
+  const rawIndices = [];
+  // Build the grid as triangles
+  for (let i = 0; i <= divisions; i++) {
+    const x = -size.x / 2 + (size.x * i) / divisions;
+    const y = -size.y / 2 + (size.y * i) / divisions;
 
-        // Vertical quad (two triangles)
-        rawPositions.push(x - divisionWidth * size.x / 2, -size.y / 2, 0);
-        rawPositions.push(x + divisionWidth * size.x / 2, -size.y / 2, 0);
-        rawPositions.push(x + divisionWidth * size.x / 2, size.y / 2, 0);
-        rawPositions.push(x - divisionWidth * size.x / 2, size.y / 2, 0);
-        const baseIndex = i * 4;
-        rawIndices.push(baseIndex, baseIndex + 1, baseIndex + 2);
-        rawIndices.push(baseIndex, baseIndex + 2, baseIndex + 3);
+    // Vertical quad (two triangles)
+    rawPositions.push(x - (divisionWidth * size.x) / 2, -size.y / 2, 0);
+    rawPositions.push(x + (divisionWidth * size.x) / 2, -size.y / 2, 0);
+    rawPositions.push(x + (divisionWidth * size.x) / 2, size.y / 2, 0);
+    rawPositions.push(x - (divisionWidth * size.x) / 2, size.y / 2, 0);
+    const baseIndex = i * 4;
+    rawIndices.push(baseIndex, baseIndex + 1, baseIndex + 2);
+    rawIndices.push(baseIndex, baseIndex + 2, baseIndex + 3);
 
-        // Horizontal quad (two triangles)
-        rawPositions.push(-size.x / 2, y - divisionWidth * size.y / 2, 0);
-        rawPositions.push(size.x / 2, y - divisionWidth * size.y / 2, 0);
-        rawPositions.push(size.x / 2, y + divisionWidth * size.y / 2, 0);
-        rawPositions.push(-size.x / 2, y + divisionWidth * size.y / 2, 0);
-        const baseIndex2 = (divisions + 1 + i) * 4;
-        rawIndices.push(baseIndex2, baseIndex2 + 1, baseIndex2 + 2);
-        rawIndices.push(baseIndex2, baseIndex2 + 2, baseIndex2 + 3);
-    }
-    buildSimpleGltf(doc, rawPositions, rawIndices, null, transform, '__helper_grid', WebGL2RenderingContext.TRIANGLES);
-}
+    // Horizontal quad (two triangles)
+    rawPositions.push(-size.x / 2, y - (divisionWidth * size.y) / 2, 0);
+    rawPositions.push(size.x / 2, y - (divisionWidth * size.y) / 2, 0);
+    rawPositions.push(size.x / 2, y + (divisionWidth * size.y) / 2, 0);
+    rawPositions.push(-size.x / 2, y + (divisionWidth * size.y) / 2, 0);
+    const baseIndex2 = (divisions + 1 + i) * 4;
+    rawIndices.push(baseIndex2, baseIndex2 + 1, baseIndex2 + 2);
+    rawIndices.push(baseIndex2, baseIndex2 + 2, baseIndex2 + 3);
+  }
+  return [rawPositions, rawIndices];
+}

frontend/misc/lines.ts

@@ -0,0 +1,55 @@
+import {BufferGeometry} from 'three/src/core/BufferGeometry.js';
+import {Vector2} from 'three/src/math/Vector2.js';
+
+// The following imports must be done dynamically to be able to import three.js separately (smaller bundle sizee)
+// import {LineSegments2} from "three/examples/jsm/lines/LineSegments2.js";
+// import {LineMaterial} from "three/examples/jsm/lines/LineMaterial.js";
+// import {LineSegmentsGeometry} from 'three/examples/jsm/lines/LineSegmentsGeometry.js';
+const LineSegments2Import = import('three/examples/jsm/lines/LineSegments2.js');
+const LineMaterialImport = import('three/examples/jsm/lines/LineMaterial.js');
+const LineSegmentsGeometryImport = import('three/examples/jsm/lines/LineSegmentsGeometry.js');
+
+export async function toLineSegments(bufferGeometry: BufferGeometry, lineWidth: number = 0.1) {
+    const LineSegments2 = (await LineSegments2Import).LineSegments2;
+    const LineMaterial = (await LineMaterialImport).LineMaterial;
+    return new LineSegments2(await toLineSegmentsGeometry(bufferGeometry), new LineMaterial({
+        color: 0xffffffff,
+        vertexColors: true,
+        linewidth: lineWidth, // mm
+        worldUnits: true,
+        resolution: new Vector2(1, 1), // Update resolution on resize!!!
+    }));
+}
+
+async function toLineSegmentsGeometry(bufferGeometry: BufferGeometry) {
+    const LineSegmentsGeometry = (await LineSegmentsGeometryImport).LineSegmentsGeometry;
+    const lg = new LineSegmentsGeometry();
+
+    const position = bufferGeometry.getAttribute('position');
+    const indexAttribute = bufferGeometry.index!!;
+    const positions = [];
+    for (let index = 0; index != indexAttribute.count; ++index) {
+        const i = indexAttribute.getX(index);
+        const x = position.getX(i);
+        const y = position.getY(i);
+        const z = position.getZ(i);
+        positions.push(x, y, z);
+    }
+    lg.setPositions(positions);
+
+    const colors = [];
+    const color = bufferGeometry.getAttribute('color');
+    if (color) {
+        for (let index = 0; index != indexAttribute.count; ++index) {
+            const i = indexAttribute.getX(index);
+            const r = color.getX(i);
+            const g = color.getY(i);
+            const b = color.getZ(i);
+            colors.push(r, g, b);
+        }
+        lg.setColors(colors);
+    }
+
+    lg.userData = bufferGeometry.userData;
+    return lg;
+}

frontend/misc/network.ts

@@ -1,19 +1,38 @@
 import {settings} from "./settings";
 
-export class NetworkUpdateEvent extends Event {
-    name: string;
-    url: string;
+const batchTimeout = 250; // ms
 
-    constructor(name: string, url: string) {
-        super("update");
+export class NetworkUpdateEventModel {
+    name: string;
+    url: string | Blob;
+    // TODO: Detect and manage instances of the same object (same hash, different name)
+    hash: string | null;
+    isRemove: boolean | null; // This is null for a shutdown event
+
+    constructor(name: string, url: string | Blob, hash: string | null, isRemove: boolean | null) {
         this.name = name;
         this.url = url;
+        this.hash = hash;
+        this.isRemove = isRemove;
+    }
+}
+
+export class NetworkUpdateEvent extends Event {
+    models: NetworkUpdateEventModel[];
+    disconnect: () => void;
+
+    constructor(models: NetworkUpdateEventModel[], disconnect: () => void) {
+        super("update");
+        this.models = models;
+        this.disconnect = disconnect;
     }
 }
 
 /** Listens for updates and emits events when a model changes */
 export class NetworkManager extends EventTarget {
     private knownObjectHashes: { [name: string]: string | null } = {};
+    private bufferedUpdates: NetworkUpdateEventModel[] = [];
+    private batchTimeout: number | null = null;
 
     /**
      * Tries to load a new model (.glb) from the given URL.
@@ -23,43 +42,133 @@ export class NetworkManager extends EventTarget {
      *
      * Updates will be emitted as "update" events, including the download URL and the model name.
      */
-    async load(url: string) {
-        if (url.startsWith("ws://") || url.startsWith("wss://")) {
-            this.monitorWebSocket(url);
+    async load(url: string | Blob) {
+        if (!(url instanceof Blob) && (url.startsWith("dev+") || url.startsWith("dev "))) {
+            let baseUrl = new URL(url.slice(4));
+            baseUrl.searchParams.set("api_updates", "true");
+            await this.monitorDevServer(baseUrl);
         } else {
-            // Get the last part of the URL as the "name" of the model
-            let name = url.split("/").pop();
-            name = name?.split(".")[0] || `unknown-${Math.random()}`;
-            // Use a head request to get the hash of the file
-            let response = await fetch(url, {method: "HEAD"});
-            let hash = response.headers.get("etag");
+            let name;
+            let hash = null;
+            if (url instanceof Blob) {
+                if (url instanceof File) name = (url as File).name
+                else name = `blob-${Math.random()}`;
+                name = name.replace('.glb', '').replace('.gltf', '');
+            } else {
+                // If there is a #name parameter in the URL, use it as the name
+                let hashParams: URLSearchParams
+                try {
+                    let urlObj = new URL(url, window.location.href);
+                    hashParams = new URLSearchParams(urlObj.hash.slice(1));
+                } catch (e) {
+                    hashParams = new URLSearchParams();
+                }
+                if (hashParams.has("name")) {
+                    name = hashParams.get("name") || `unknown-${Math.random()}`;
+                } else { // Default to the last part of the URL as the "name" of the model
+                    name = url.split("/").pop();
+                }
+                name = name?.split(".")[0] || `unknown-${Math.random()}`;
+                // Use a head request to get the hash of the file
+                let response = await fetch(url, {method: "HEAD"});
+                hash = response.headers.get("etag");
+            }
             // Only trigger an update if the hash has changed
-            this.foundModel(name, hash, url);
+            this.foundModel(name, hash, url, false);
         }
     }
 
-    private monitorWebSocket(url: string) {
-        // WARNING: This will spam the console logs with failed requests when the server is down
-        let ws = new WebSocket(url);
-        ws.onmessage = (event) => {
-            let data = JSON.parse(event.data);
-            console.debug("WebSocket message", data);
-            let urlObj = new URL(url);
-            urlObj.protocol = urlObj.protocol === "ws:" ? "http:" : "https:";
-            urlObj.searchParams.set("api_object", data.name);
-            this.foundModel(data.name, data.hash, urlObj.toString());
-        };
-        ws.onerror = () => ws.close();
-        ws.onclose = () => setTimeout(() => this.monitorWebSocket(url), settings.monitorEveryMs);
-        let timeoutFaster = setTimeout(() => ws.close(), settings.monitorOpenTimeoutMs);
-        ws.onopen = () => clearTimeout(timeoutFaster);
+    private async monitorDevServer(url: URL, stop: () => boolean = () => false) {
+        while (!stop()) {
+            let monitorEveryMs = (await settings).monitorEveryMs;
+            try {
+                // WARNING: This will spam the console logs with failed requests when the server is down
+                const controller = new AbortController();
+                let response = await fetch(url.toString(), {signal: controller.signal});
+                // console.log("Monitoring", url.toString(), response);
+                if (response.status === 200) {
+                    let lines = readLinesStreamings(response.body!.getReader());
+                    for await (let line of lines) {
+                        if (stop()) break;
+                        if (!line || !line.startsWith("data:")) continue;
+                        let data: { name: string, hash: string, is_remove: boolean | null } = JSON.parse(line.slice(5));
+                        // console.debug("WebSocket message", data);
+                        let urlObj = new URL(url);
+                        urlObj.searchParams.delete("api_updates");
+                        urlObj.searchParams.set("api_object", data.name);
+                        this.foundModel(data.name, data.hash, urlObj.toString(), data.is_remove, async () => {
+                            controller.abort(); // Notify the server that we are done
+                        });
+                    }
+                } else {
+                    // Server is down, wait a little longer before retrying
+                    await new Promise(resolve => setTimeout(resolve, 10 * monitorEveryMs));
+                }
+                controller.abort();
+            } catch (e) { // Ignore errors (retry very soon)
+            }
+            await new Promise(resolve => setTimeout(resolve, monitorEveryMs));
+        }
     }
 
-    private foundModel(name: string, hash: string | null, url: string) {
-        let prevHash = this.knownObjectHashes[name];
-        if (!hash || hash !== prevHash) {
-            this.knownObjectHashes[name] = hash;
-            this.dispatchEvent(new NetworkUpdateEvent(name, url));
+    private foundModel(name: string, hash: string | null, url: string | Blob, isRemove: boolean | null, disconnect: () => void = () => {
+    }) {
+        // console.debug("Found model", name, "with hash", hash, "at", url, "isRemove", isRemove);
+
+        // We only care about the latest update per model name
+        this.bufferedUpdates = this.bufferedUpdates.filter(m => m.name !== name);
+
+        // Add the new model to the list of updates and dispatch the early update
+        let upd = new NetworkUpdateEventModel(name, url, hash, isRemove);
+        this.bufferedUpdates.push(upd);
+        this.dispatchEvent(new CustomEvent("update-early", {detail: this.bufferedUpdates}));
+
+        // Optimization: try to batch updates automatically for faster rendering
+        if (this.batchTimeout !== null) clearTimeout(this.batchTimeout);
+        this.batchTimeout = setTimeout(() => {
+            // Update known hashes for minimal updates
+            for (let model of this.bufferedUpdates) {
+                if (model.isRemove == false && model.hash && model.hash === this.knownObjectHashes[model.name]) {
+                    // Delete this useless update
+                    let foundFirst = false;
+                    this.bufferedUpdates = this.bufferedUpdates.filter(m => {
+                        if (m === model) {
+                            if (!foundFirst) { // Remove only first full match
+                                foundFirst = true;
+                                return false;
+                            }
+                        }
+                        return true;
+                    })
+                } else {
+                    // Keep this update and update the last known hash
+                    if (model.isRemove == true) {
+                        if (model.name in this.knownObjectHashes) delete this.knownObjectHashes[model.name];
+                    } else if (model.isRemove == false) {
+                        this.knownObjectHashes[model.name] = model.hash;
+                    }
+                }
+            }
+
+            // Dispatch the event to actually update the models
+            this.dispatchEvent(new NetworkUpdateEvent(this.bufferedUpdates, disconnect));
+            this.bufferedUpdates = [];
+        }, batchTimeout);
+    }
+}
+
+async function* readLinesStreamings(reader: ReadableStreamDefaultReader<Uint8Array>) {
+    let decoder = new TextDecoder();
+    let buffer = new Uint8Array();
+    while (true) {
+        let {value, done} = await reader.read();
+        if (done || !value) break;
+        buffer = new Uint8Array([...buffer, ...value]);
+        let text = decoder.decode(buffer);
+        let lines = text.split("\n");
+        for (let i = 0; i < lines.length - 1; i++) {
+            yield lines[i];
         }
+        buffer = new Uint8Array([...buffer.slice(-1)]);
     }
 }

frontend/misc/scene.ts

@@ -1,5 +1,5 @@
 import {type Ref} from 'vue';
-import {Document} from '@gltf-transform/core';
+import {Buffer, Document, Scene} from '@gltf-transform/core';
 import {extrasNameKey, extrasNameValueHelpers, mergeFinalize, mergePartial, removeModel, toBuffer} from "./gltf";
 import {newAxes, newGridBox} from "./helpers";
 import {Vector3} from "three/src/math/Vector3.js"
@@ -9,41 +9,36 @@ import {Matrix4} from "three/src/math/Matrix4.js"
 /** This class helps manage SceneManagerData. All methods are static to support reactivity... */
 export class SceneMgr {
     /** Loads a GLB model from a URL and adds it to the viewer or replaces it if the names match */
-    static async loadModel(sceneUrl: Ref<string>, document: Document, name: string, url: string): Promise<Document> {
+    static async loadModel(sceneUrl: Ref<string>, document: Document, name: string, url: string | Blob, updateHelpers: boolean = true, reloadScene: boolean = true): Promise<Document> {
         let loadStart = performance.now();
+        let loadNetworkEnd: number;
 
-        // Start merging into the current document, replacing or adding as needed
-        document = await mergePartial(url, name, document);
+        try {
+            // Start merging into the current document, replacing or adding as needed
+            document = await mergePartial(url, name, document, () => loadNetworkEnd = performance.now());
 
-        console.log("Model", name, "loaded in", performance.now() - loadStart, "ms");
+            console.log("Model", name, "loaded in", performance.now() - loadNetworkEnd!, "ms after",
+                loadNetworkEnd! - loadStart, "ms of transferring data (maybe building the object on the server)");
+        } finally {
+            if (updateHelpers) {
+                // Reload the helpers to fit the new model
+                await this.reloadHelpers(sceneUrl, document, reloadScene);
+                reloadScene = false;
+            }
 
-        if (name !== extrasNameValueHelpers) {
-            // Reload the helpers to fit the new model
-            // TODO: Only reload the helpers after a few milliseconds of no more models being added/removed
-            document = await this.reloadHelpers(sceneUrl, document);
-        } else {
-            // Display the final fully loaded model
-            let displayStart = performance.now();
-            document = await this.showCurrentDoc(sceneUrl, document);
-            console.log("Scene displayed in", performance.now() - displayStart, "ms");
+            if (reloadScene) {
+                // Display the final fully loaded model
+                let displayStart = performance.now();
+                document = await this.showCurrentDoc(sceneUrl, document);
+                console.log("Scene displayed in", performance.now() - displayStart, "ms");
+            }
         }
 
         return document;
     }
 
-    private static async reloadHelpers(sceneUrl: Ref<string>, document: Document): Promise<Document> {
-        let bb = SceneMgr.getBoundingBox(document);
-
-        // Create the helper axes and grid box
-        let helpersDoc = new Document();
-        let transform = (new Matrix4()).makeTranslation(bb.getCenter(new Vector3()));
-        newAxes(helpersDoc, bb.getSize(new Vector3()).multiplyScalar(0.5), transform);
-        newGridBox(helpersDoc, bb.getSize(new Vector3()), transform);
-        let helpersUrl = URL.createObjectURL(new Blob([await toBuffer(helpersDoc)]));
-        return await SceneMgr.loadModel(sceneUrl, document, extrasNameValueHelpers, helpersUrl);
-    }
-
-    static getBoundingBox(document: Document): Box3 {
+    static getBoundingBox(document: Document): Box3 | null {
+        if (document.getRoot().listNodes().length === 0) return null;
         // Get bounding box of the model and use it to set the size of the helpers
         let bbMin: number[] = [1e6, 1e6, 1e6];
         let bbMax: number[] = [-1e6, -1e6, -1e6];
@@ -67,7 +62,7 @@ export class SceneMgr {
     }
 
     /** Removes a model from the viewer */
-    static async removeModel(sceneUrl: Ref<string>, document: Document, name: string): Promise<Document> {
+    static async removeModel(sceneUrl: Ref<string>, document: Document, name: string, updateHelpers: boolean = true, reloadScene: boolean = true): Promise<Document> {
         let loadStart = performance.now();
 
         // Remove the model from the document
@@ -75,12 +70,41 @@ export class SceneMgr {
 
         console.log("Model", name, "removed in", performance.now() - loadStart, "ms");
 
-        // Reload the helpers to fit the new model (will also show the document)
-        document = await this.reloadHelpers(sceneUrl, document);
+        if (updateHelpers) {
+            // Reload the helpers to fit the new model (will also show the document)
+            document = await this.reloadHelpers(sceneUrl, document, reloadScene);
+        }
 
         return document;
     }
 
+    private static async reloadHelpers(sceneUrl: Ref<string>, document: Document, reloadScene: boolean): Promise<Document> {
+        let bb = SceneMgr.getBoundingBox(document);
+        if (!bb) return document; // Empty document, no helpers to show
+
+        // If only the helpers remain, go back to the empty scene
+        let noOtherModels = true;
+        for (let elem of document.getGraph().listEdges().map(e => e.getChild())) {
+            if (elem.getExtras() && !(elem instanceof Scene) && !(elem instanceof Buffer) &&
+                elem.getExtras()[extrasNameKey] !== extrasNameValueHelpers) {
+                // There are other elements in the document, so we can show the helpers
+                noOtherModels = false;
+                break;
+            }
+        }
+        if (noOtherModels) return await removeModel(extrasNameValueHelpers, document);
+
+        // Create the helper axes and grid box
+        let helpersDoc = new Document();
+        let transform = (new Matrix4()).makeTranslation(bb.getCenter(new Vector3()));
+        newAxes(helpersDoc, bb.getSize(new Vector3()).multiplyScalar(0.5), transform);
+        newGridBox(helpersDoc, bb.getSize(new Vector3()), transform);
+        let helpersUrl = URL.createObjectURL(new Blob([await toBuffer(helpersDoc) as ArrayBufferView<ArrayBuffer>]));
+        let newDocument = await SceneMgr.loadModel(sceneUrl, document, extrasNameValueHelpers, helpersUrl, false, reloadScene);
+        URL.revokeObjectURL(helpersUrl);
+        return newDocument;
+    }
+
     /** Serializes the current document into a GLB and updates the viewerSrc */
     private static async showCurrentDoc(sceneUrl: Ref<string>, document: Document): Promise<Document> {
         // Make sure the document is fully loaded and ready to be shown
@@ -88,8 +112,9 @@ export class SceneMgr {
 
         // Serialize the document into a GLB and update the viewerSrc
         let buffer = await toBuffer(document);
-        let blob = new Blob([buffer], {type: 'model/gltf-binary'});
-        console.debug("Showing current doc", document, "as", Array.from(buffer));
+        let blob = new Blob([buffer as ArrayBufferView<ArrayBuffer>], {type: 'model/gltf-binary'});
+        console.debug("Showing current doc", document, "with", buffer.length, "total bytes");
+        if (sceneUrl.value.startsWith("blob:")) URL.revokeObjectURL(sceneUrl.value);
         sceneUrl.value = URL.createObjectURL(blob);
 
         return document;

frontend/misc/settings.ts

@@ -1,43 +1,132 @@
 // These are the default values for the settings, which are overridden below
-export const settings = {
-    preloadModels: [
-        // @ts-ignore
-        // new URL('../../assets/fox.glb', import.meta.url).href,
-        // @ts-ignore
-        // new URL('../../assets/logo_build/base.glb', import.meta.url).href,
-        // @ts-ignore
-        // new URL('../../assets/logo_build/location.glb', import.meta.url).href,
-        // @ts-ignore
-        // new URL('../../assets/logo_build/img.jpg.glb', import.meta.url).href,
-        // Websocket URLs automatically listen for new models from the python backend
-        "ws://127.0.0.1:32323/"
-    ],
-    displayLoadingEveryMs: 1000, /* How often to display partially loaded models */
-    monitorEveryMs: 100,
-    monitorOpenTimeoutMs: 100,
-    // ModelViewer settings
-    autoplay: true,
-    arModes: 'webxr scene-viewer quick-look',
-    exposure: 1,
-    shadowIntensity: 0,
-    background: '',
-}
+import {ungzip} from "pako";
+import {b64UrlDecode} from "../tools/b64.ts";
+import {retrieveFile} from "../tools/upload-file.ts";
 
 const firstTimeNames: Array<string> = []; // Needed for array values, which clear the array when overridden
-function parseSetting(name: string, value: string): any {
+export const settings = (async () => {
+    let settings = {
+        preload: [
+            // @ts-ignore
+            // new URL('../../assets/fox.glb', import.meta.url).href,
+            // @ts-ignore
+            // new URL('../../assets/logo_build/base.glb', import.meta.url).href,
+            // @ts-ignore
+            // new URL('../../assets/logo_build/location.glb', import.meta.url).href,
+            // @ts-ignore
+            // new URL('../../assets/logo_build/img.glb', import.meta.url).href,
+            // Websocket URLs automatically listen for new models from the python backend
+            '<auto>', // Get the default preload URL if not overridden
+        ],
+        loadHelpers: true,
+        edgeWidth: 0, /* The default line size for edges, set to 0 to use basic gl.LINEs */
+        displayLoadingEveryMs: 1000, /* How often to display partially loaded models */
+        monitorEveryMs: 100,
+        monitorOpenTimeoutMs: 1000,
+        // ModelViewer settings
+        autoplay: true, // Global animation toggle
+        arModes: 'webxr scene-viewer quick-look',
+        zoomSensitivity: 0.25,
+        orbitSensitivity: 1,
+        panSensitivity: 1,
+        exposure: 1,
+        shadowIntensity: 0,
+        // Nice low-res outdoor/high-contrast HDRI image (CC0 licensed) for lighting
+        environment: new URL('../../assets/qwantani_afternoon_1k_hdr.jpg', import.meta.url).href,
+        environmentIntensity: 1.0,
+        // Uniform (1x1 pixel) medium gray background for visibility (following dark/light mode)
+        skybox: (window.matchMedia("(prefers-color-scheme: dark)").matches ?
+            "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEU4ODiyn42XAAAACklEQVQI" +
+            "12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==" :
+            "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEW6urpaLVq8AAAACklEQVQI" +
+            "12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg=="),
+
+        // Playground settings
+        pg_code: "", // Automatically loaded and executed code for the playground
+        pg_opacity_loading: -1, // Opacity of the code during first load and run (< 0 is 0.0 if preload and 0.9 if not)
+        pg_opacity_loaded: 0.9, // Opacity of the code after it has been run for the first time
+    };
+
+    // Auto-override any settings from the URL (either GET parameters or hash)
+    const url = new URL(window.location.href);
+    url.searchParams.forEach((value, key) => {
+        if (key in settings) (settings as any)[key] = parseSetting(key, value, settings);
+    })
+    if (url.hash.length > 0) { // Hash has bigger limits as it is not sent to the server
+        const hash = url.hash.slice(1);
+        const hashParams = new URLSearchParams(hash);
+        hashParams.forEach((value, key) => {
+            if (key in settings) (settings as any)[key] = parseSetting(key, value, settings);
+        });
+    }
+
+    // Get the default preload URL if not overridden (requires a fetch that is avoided if possible)
+    for (let i = 0; i < settings.preload.length; i++) {
+        let url = settings.preload[i];
+        // Ignore empty preload URLs to allow overriding default auto behavior
+        if (url === '') {
+            settings.preload = settings.preload.slice(0, i).concat(settings.preload.slice(i + 1));
+            continue; // Skip this preload URL
+        }
+        // Handle special <auto> preload URL
+        if (url === '<auto>') {
+            if (settings.pg_code != "") { // <auto> means no preload URL if code is set
+                settings.preload = settings.preload.slice(0, i).concat(settings.preload.slice(i + 1));
+                continue; // Skip this preload URL
+            }
+            const possibleBackend = new URL("./?api_updates=true", window.location.href)
+            await fetch(possibleBackend, {method: "HEAD"}).then((response) => {
+                if (response.ok && response.headers.get("Content-Type") === "text/event-stream") {
+                    // Frontend served by the backend: default to this URL for updates
+                    url = "dev+" + possibleBackend.href;
+                }
+            }).catch((error) => console.error("Failed to check for backend:", error));
+            if (url === '<auto>') { // Fallback to the default preload URL of localhost
+                url = "dev+http://localhost:32323";
+            }
+        }
+        settings.preload[i] = url ?? "";
+    }
+
+    // Auto-decompress the code and other playground settings
+    if (settings.pg_code.length > 0) {
+        // pg_code has a few possible formats: URL, base64url+gzipped, or raw code (try them in that order)
+        try {
+            new URL(settings.pg_code); // Check if it's a valid absolute URL
+            settings.pg_code = await (await retrieveFile(settings.pg_code)).text();
+        } catch (error1) { // Not a valid URL, try base64url+gzipped
+            try {
+                settings.pg_code = ungzip(b64UrlDecode(settings.pg_code), {to: 'string'});
+            } catch (error2) { // Not base64url+gzipped, assume it's raw code
+                console.log("pg_code is not a URL (", error1, ") or base64url+gzipped (", error2, "), using it as raw code:", settings.pg_code);
+            }
+        }
+        if (settings.pg_opacity_loading < 0) {
+            // If the opacity is not set, use 0.0 if preload is set, otherwise 0.9
+            settings.pg_opacity_loading = settings.preload.length > 0 ? 0.0 : 0.9;
+        }
+    }
+    return settings;
+})()
+
+function parseSetting(name: string, value: string, settings: any): any {
     let arrayElem = name.endsWith(".0")
     if (arrayElem) name = name.slice(0, -2);
     let prevValue = (settings as any)[name];
     if (prevValue === undefined) throw new Error(`Unknown setting: ${name}`);
-    if (Array.isArray(prevValue) && !arrayElem) {
-        let toExtend = []
-        if (!firstTimeNames.includes(name)) {
-            firstTimeNames.push(name);
+    if (Array.isArray(prevValue)) {
+        if (!arrayElem) {
+            let toExtend = []
+            if (!firstTimeNames.includes(name)) {
+                firstTimeNames.push(name);
+            } else {
+                toExtend = prevValue;
+            }
+            toExtend.push(parseSetting(name + ".0", value, settings));
+            return toExtend;
         } else {
-            toExtend = prevValue;
+            prevValue = prevValue[0];
         }
-        toExtend.push(parseSetting(name + ".0", value));
-        return toExtend;
     }
     switch (typeof prevValue) {
         case 'boolean':
@@ -47,12 +136,6 @@ function parseSetting(name: string, value: string): any {
         case 'string':
             return value;
         default:
-            throw new Error(`Unknown setting type: ${typeof prevValue}`);
+            throw new Error(`Unknown setting type: ${typeof prevValue} -- ${prevValue}`);
     }
 }
-
-// Auto-override any settings from the URL
-const url = new URL(window.location.href);
-url.searchParams.forEach((value, key) => {
-    if (key in settings) (settings as any)[key] = parseSetting(key, value);
-})

frontend/models/Model.vue

@@ -1,4 +1,4 @@
-<script setup lang="ts">
+<script lang="ts" setup>
 import {
   VBtn,
   VBtnToggle,
@@ -12,26 +12,32 @@ import {
   VTooltip,
 } from "vuetify/lib/components/index.mjs";
 import {extrasNameKey, extrasNameValueHelpers} from "../misc/gltf";
-import {Document, Mesh} from "@gltf-transform/core";
-import {inject, ref, type ShallowRef, watch} from "vue";
+import {Mesh} from "@gltf-transform/core";
+import {nextTick, ref, watch} from "vue";
 import type ModelViewerWrapper from "../viewer/ModelViewerWrapper.vue";
 import {
+  mdiArrowExpand,
   mdiCircleOpacity,
   mdiCube,
   mdiDelete,
   mdiRectangle,
   mdiRectangleOutline,
   mdiSwapHorizontal,
+  mdiVectorLine,
   mdiVectorRectangle
 } from '@mdi/js'
+// @ts-expect-error
 import SvgIcon from '@jamescoyle/vue-icon';
-import {SceneMgr} from "../misc/scene";
 import {BackSide, FrontSide} from "three/src/constants.js";
 import {Box3} from "three/src/math/Box3.js";
 import {Color} from "three/src/math/Color.js";
 import {Plane} from "three/src/math/Plane.js";
 import {Vector3} from "three/src/math/Vector3.js";
 import type {MObject3D} from "../tools/Selection.vue";
+import {toLineSegments} from "../misc/lines.js";
+import {settings} from "../misc/settings.js"
+import {currentSceneRotation} from "../viewer/lighting.ts";
+import {Matrix4} from "three/src/math/Matrix4.js";
 
 const props = defineProps<{
   meshes: Array<Mesh>,
@@ -39,11 +45,14 @@ const props = defineProps<{
 }>();
 const emit = defineEmits<{ remove: [] }>()
 
-let modelName = props.meshes[0].getExtras()[extrasNameKey] // + " blah blah blah blah blag blah blah blah"
+let modelName = props.meshes[0]?.getExtras()?.[extrasNameKey] // + " blah blah blah blah blag blah blah blah"
 
-// Reactive properties
-const enabledFeatures = defineModel<Array<number>>("enabledFeatures", {default: [0, 1, 2]});
-const opacity = defineModel<number>("opacity", {default: 1});
+// Count the number of faces, edges and vertices
+let faceCount = ref(-1);
+let edgeCount = ref(-1);
+let vertexCount = ref(-1);
+
+// Clipping planes are handled in y-up space (swapped on interface, Z inverted later)
 const clipPlaneX = ref(1);
 const clipPlaneSwappedX = ref(false);
 const clipPlaneY = ref(1);
@@ -51,15 +60,20 @@ const clipPlaneSwappedY = ref(false);
 const clipPlaneZ = ref(1);
 const clipPlaneSwappedZ = ref(false);
 
-// Count the number of faces, edges and vertices
-let faceCount = props.meshes.map((m) => m.listPrimitives().filter(p => p.getMode() === WebGL2RenderingContext.TRIANGLES).length).reduce((a, b) => a + b, 0)
-let edgeCount = props.meshes.map((m) => m.listPrimitives().filter(p => p.getMode() in [WebGL2RenderingContext.LINE_STRIP, WebGL2RenderingContext.LINES]).length).reduce((a, b) => a + b, 0)
-let vertexCount = props.meshes.map((m) => m.listPrimitives().filter(p => p.getMode() === WebGL2RenderingContext.POINTS).length).reduce((a, b) => a + b, 0)
+const edgeWidth = ref(0);
+const explodeStrength = ref(0);
+const explodeSwapped = ref(false);
 
-// Set initial defaults for the enabled features
-if (faceCount === 0) enabledFeatures.value = enabledFeatures.value.filter((f) => f !== 0)
-if (edgeCount === 0) enabledFeatures.value = enabledFeatures.value.filter((f) => f !== 1)
-if (vertexCount === 0) enabledFeatures.value = enabledFeatures.value.filter((f) => f !== 2)
+// Load the settings for the default edge width
+(async () => {
+  let s = await settings;
+  edgeWidth.value = s.edgeWidth;
+})();
+
+// Misc properties
+const enabledFeatures = defineModel<Array<number>>("enabledFeatures", {default: [0, 1, 2]});
+const opacity = defineModel<number>("opacity", {default: 1});
+const wireframe = ref(false);
 
 // Listeners for changes in the properties (or viewer reloads)
 function onEnabledFeaturesChange(newEnabledFeatures: Array<number>) {
@@ -67,13 +81,10 @@ function onEnabledFeaturesChange(newEnabledFeatures: Array<number>) {
   let scene = props.viewer?.scene;
   let sceneModel = (scene as any)?._model;
   if (!scene || !sceneModel) return;
-  // Iterate all primitives of the mesh and set their visibility based on the enabled features
-  // Use the scene graph instead of the document to avoid reloading the same model, at the cost
-  // of not actually removing the primitives from the scene graph
   sceneModel.traverse((child: MObject3D) => {
     if (child.userData[extrasNameKey] === modelName) {
       let childIsFace = child.type == 'Mesh' || child.type == 'SkinnedMesh'
-      let childIsEdge = child.type == 'Line' || child.type == 'LineSegments'
+      let childIsEdge = child.type == 'Line' || child.type == 'LineSegments' || child.type == 'LineSegments2'
       let childIsVertex = child.type == 'Points'
       if (childIsFace || childIsEdge || childIsVertex) {
         let visible = newEnabledFeatures.includes(childIsFace ? 0 : childIsEdge ? 1 : childIsVertex ? 2 : -1);
@@ -87,16 +98,12 @@ function onEnabledFeaturesChange(newEnabledFeatures: Array<number>) {
   scene.queueRender()
 }
 
-watch(enabledFeatures, onEnabledFeaturesChange);
+watch(enabledFeatures, onEnabledFeaturesChange, {deep: true});
 
 function onOpacityChange(newOpacity: number) {
   let scene = props.viewer?.scene;
   let sceneModel = (scene as any)?._model;
   if (!scene || !sceneModel) return;
-  // Iterate all primitives of the mesh and set their opacity based on the enabled features
-  // Use the scene graph instead of the document to avoid reloading the same model, at the cost
-  // of not actually removing the primitives from the scene graph
-  // console.log('Opacity may have changed', newOpacity)
   sceneModel.traverse((child: MObject3D) => {
     if (child.userData[extrasNameKey] === modelName) {
       if (child.material && child.material.opacity !== newOpacity) {
@@ -111,7 +118,23 @@ function onOpacityChange(newOpacity: number) {
 
 watch(opacity, onOpacityChange);
 
-let {sceneDocument} = inject<{ sceneDocument: ShallowRef<Document> }>('sceneDocument')!!;
+function onWireframeChange(newWireframe: boolean) {
+  let scene = props.viewer?.scene;
+  let sceneModel = (scene as any)?._model;
+  if (!scene || !sceneModel) return;
+  sceneModel.traverse((child: MObject3D) => {
+    if (child.userData[extrasNameKey] === modelName) {
+      let childIsFace = child.type == 'Mesh' || child.type == 'SkinnedMesh'
+      if (child.material && child.material.wireframe !== newWireframe && childIsFace) {
+        child.material.wireframe = newWireframe;
+        child.material.needsUpdate = true;
+      }
+    }
+  });
+  scene.queueRender()
+}
+
+watch(wireframe, onWireframeChange);
 
 function onClipPlanesChange() {
   let scene = props.viewer?.scene;
@@ -125,25 +148,30 @@ function onClipPlanesChange() {
   if (props.viewer?.renderer && (enabledX || enabledY || enabledZ)) {
     // Global value for all models, once set it cannot be unset (unknown for other models...)
     props.viewer.renderer.threeRenderer.localClippingEnabled = true;
-    // Due to model-viewer's camera manipulation, the bounding box needs to be transformed
-    bbox = SceneMgr.getBoundingBox(sceneDocument.value);
-    bbox.translate(scene.getTarget());
+    // Get the bounding box containing all features of this model
+    bbox = new Box3();
+    sceneModel.traverse((child: MObject3D) => {
+      if (child.userData[extrasNameKey] === modelName) {
+        bbox.expandByObject(child);
+      }
+    });
   }
   sceneModel.traverse((child: MObject3D) => {
     if (child.userData[extrasNameKey] === modelName) {
       if (child.material) {
-        if (bbox) {
+        if (bbox?.isEmpty() == false) {
           let offsetX = bbox.min.x + clipPlaneX.value * (bbox.max.x - bbox.min.x);
-          let offsetY = bbox.min.z + clipPlaneY.value * (bbox.max.z - bbox.min.z);
-          let offsetZ = bbox.min.y + clipPlaneZ.value * (bbox.max.y - bbox.min.y);
+          let offsetY = bbox.min.y + clipPlaneY.value * (bbox.max.y - bbox.min.y);
+          let offsetZ = bbox.min.z + (1 - clipPlaneZ.value) * (bbox.max.z - bbox.min.z);
+          let rotSceneMatrix = new Matrix4().makeRotationY(currentSceneRotation);
           let planes = [
-            new Plane(new Vector3(-1, 0, 0), offsetX),
-            new Plane(new Vector3(0, 0, 1), offsetY),
-            new Plane(new Vector3(0, -1, 0), offsetZ),
+            new Plane(new Vector3(-1, 0, 0), offsetX).applyMatrix4(rotSceneMatrix),
+            new Plane(new Vector3(0, -1, 0), offsetY).applyMatrix4(rotSceneMatrix),
+            new Plane(new Vector3(0, 0, 1), -offsetZ).applyMatrix4(rotSceneMatrix),
           ];
-          if (clipPlaneSwappedX.value) planes[0].negate();
-          if (clipPlaneSwappedY.value) planes[1].negate();
-          if (clipPlaneSwappedZ.value) planes[2].negate();
+          if (clipPlaneSwappedX.value) planes[0]?.negate();
+          if (clipPlaneSwappedY.value) planes[1]?.negate();
+          if (clipPlaneSwappedZ.value) planes[2]?.negate();
           if (!enabledZ) planes.pop();
           if (!enabledY) planes.splice(1, 1);
           if (!enabledX) planes.shift();
@@ -165,20 +193,177 @@ watch(clipPlaneZ, onClipPlanesChange);
 watch(clipPlaneSwappedX, onClipPlanesChange);
 watch(clipPlaneSwappedY, onClipPlanesChange);
 watch(clipPlaneSwappedZ, onClipPlanesChange);
-// Clip planes are also affected by the camera position, so we need to listen to camera changes
-props.viewer!!.onElemReady((elem) => elem.addEventListener('camera-change', onClipPlanesChange))
+
+let edgeWidthChangeCleanup = [] as Array<() => void>;
+
+function onEdgeWidthChange(newEdgeWidth: number) {
+  let scene = props.viewer?.scene;
+  let sceneModel = (scene as any)?._model;
+  if (!scene || !sceneModel) return;
+  edgeWidthChangeCleanup.forEach((f) => f());
+  edgeWidthChangeCleanup = [];
+  let linesToImprove: Array<MObject3D> = [];
+  sceneModel.traverse((child: MObject3D) => {
+    if (child.userData[extrasNameKey] === modelName) {
+      if (child.type == 'Line' || child.type == 'LineSegments') {
+        // child.material.linewidth = 3; // Not supported in WebGL2
+        // Swap geometry with LineGeometry to support widths
+        // https://threejs.org/examples/?q=line#webgl_lines_fat
+        if (newEdgeWidth > 0) linesToImprove.push(child);
+      }
+      if (child.type == 'Points') {
+        (child.material as any).size = newEdgeWidth > 0 ? newEdgeWidth * 50 : 5;
+        child.material.needsUpdate = true;
+      }
+    }
+  });
+  linesToImprove.forEach(async (line: MObject3D) => {
+    let line2 = await toLineSegments(line.geometry, newEdgeWidth);
+    // Update resolution on resize
+    let resizeListener = (elem: HTMLElement) => {
+      line2.material.resolution.set(elem.clientWidth, elem.clientHeight);
+      line2.material.needsUpdate = true;
+    };
+    props.viewer!!.onElemReady((elem) => {
+      elem.addEventListener('resize', () => resizeListener(elem));
+      resizeListener(elem);
+    });
+    // Copy the transform of the original line
+    line2.position.copy(line.position);
+    line2.computeLineDistances();
+    line2.userData = Object.assign({}, line.userData);
+    line.parent!.add(line2);
+    line.children.forEach((o) => line2.add(o));
+    line.visible = false;
+    line.userData.niceLine = line2;
+    // line.parent!.remove(line); // Keep it for better raycast and selection!
+    line2.userData.noHit = true;
+    line2.visible = enabledFeatures.value.includes(1);
+    edgeWidthChangeCleanup.push(() => {
+      line2.parent!.remove(line2);
+      line.visible = enabledFeatures.value.includes(1);
+      props.viewer!!.onElemReady((elem) => {
+        elem.removeEventListener('resize', () => resizeListener(elem));
+      });
+    });
+  });
+  scene.queueRender()
+}
+
+watch(edgeWidth, onEdgeWidthChange);
+
+// Explode the model
+function onExplodeChange(newExplodeStrength: number) {
+  let scene = props.viewer?.scene;
+  let sceneModel = (scene as any)?._model;
+  if (!scene || !sceneModel) return;
+
+  // Get direction and size of the explosion in a first pass
+  const meBbox = new Box3();
+  const othersBbox = new Box3();
+  sceneModel.traverse((child: MObject3D) => {
+    if (child == sceneModel) return; // Skip the scene itself
+    const isMe = child.userData[extrasNameKey] === modelName;
+    if ((child.type === 'Mesh' || child.type === 'SkinnedMesh' ||
+        child.type === 'Line' || child.type === 'LineSegments' ||
+        child.type === 'Points') && !child.userData.noHit) {
+      if (isMe) {
+        meBbox.expandByObject(child);
+      } else if (!isMe && child.userData[extrasNameKey]) {
+        othersBbox.expandByObject(child);
+      }
+    }
+  });
+  const modelSize = new Vector3();
+  meBbox.getSize(modelSize);
+  const maxDimension = Math.max(modelSize.x, modelSize.y, modelSize.z);
+  const pushDirection = new Vector3().subVectors(meBbox.getCenter(new Vector3()), othersBbox.getCenter(new Vector3())).normalize();
+
+
+  // Use absolute value for strength calculation
+  let strength = Math.abs(newExplodeStrength);
+  if (explodeSwapped.value) strength = -strength;
+
+  // Apply explosion
+  sceneModel.traverse((child: MObject3D) => {
+    if (child.userData[extrasNameKey] === modelName) {
+      if ((child.type === 'Mesh' || child.type === 'SkinnedMesh' ||
+          child.type === 'Line' || child.type === 'LineSegments' ||
+          child.type === 'Points')) {
+
+        // Handle zero vector case (if object is at origin)
+        const direction = pushDirection.clone();
+        if (direction.lengthSq() < 0.0001) {
+          direction.set(0, 1, 0);
+          console.warn("Explode direction was zero, using (0, 1, 0) instead");
+        }
+
+        // Calculate new position based on model size
+        const factor = strength * maxDimension;
+        const newPosition = new Vector3().add(direction.multiplyScalar(factor));
+
+        // Apply new position
+        child.position.copy(newPosition);
+
+        // Update related objects (back is automatically updated)
+        if (child.userData.niceLine) {
+          child.userData.niceLine.position.copy(newPosition);
+        }
+      }
+    }
+  });
+
+  scene.queueRender();
+  onClipPlanesChange();
+}
+
+// Add watchers for explode variables
+watch(explodeStrength, (newVal) => onExplodeChange(newVal));
+watch(explodeSwapped, () => onExplodeChange(explodeStrength.value));
+
 
 function onModelLoad() {
   let scene = props.viewer?.scene;
   let sceneModel = (scene as any)?._model;
   if (!scene || !sceneModel) return;
-  // Iterate all primitives of the mesh and set their visibility based on the enabled features
-  // Use the scene graph instead of the document to avoid reloading the same model, at the cost
-  // of not actually removing the primitives from the scene graph
+
+  // Count the number of faces, edges and vertices
+  const isFirstLoad = faceCount.value === -1;
+  faceCount.value = props.meshes
+      .flatMap((m) => m.listPrimitives().filter(p => p.getMode() === WebGL2RenderingContext.TRIANGLES))
+      .map(p => (p.getExtras()?.face_triangles_end as any)?.length ?? 1)
+      .reduce((a, b) => a + b, 0)
+  edgeCount.value = props.meshes
+      .flatMap((m) => m.listPrimitives().filter(p => p.getMode() in [WebGL2RenderingContext.LINE_STRIP, WebGL2RenderingContext.LINES]))
+      .map(p => (p.getExtras()?.edge_points_end as any)?.length ?? 0)
+      .reduce((a, b) => a + b, 0)
+  vertexCount.value = props.meshes
+      .flatMap((m) => m.listPrimitives().filter(p => p.getMode() === WebGL2RenderingContext.POINTS))
+      .map(p => (p.getAttribute("POSITION")?.getCount() ?? 0))
+      .reduce((a, b) => a + b, 0)
+
+  // First time: set the enabled features to all provided features
+  if (isFirstLoad) {
+    if (faceCount.value === 0) enabledFeatures.value = enabledFeatures.value.filter((f) => f !== 0)
+    else if (!enabledFeatures.value.includes(0)) enabledFeatures.value.push(0)
+    if (edgeCount.value === 0) enabledFeatures.value = enabledFeatures.value.filter((f) => f !== 1)
+    else if (!enabledFeatures.value.includes(1)) enabledFeatures.value.push(1)
+    if (vertexCount.value === 0) enabledFeatures.value = enabledFeatures.value.filter((f) => f !== 2)
+    else if (!enabledFeatures.value.includes(2)) enabledFeatures.value.push(2)
+  }
+
+  // Add darkened back faces for all face objects to improve cutting planes
   let childrenToAdd: Array<MObject3D> = [];
   sceneModel.traverse((child: MObject3D) => {
+    child.updateMatrixWorld();  // Objects are mostly static, so ensure updated matrices
     if (child.userData[extrasNameKey] === modelName) {
       if (child.type == 'Mesh' || child.type == 'SkinnedMesh') {
+        // Compute a BVH for faster raycasting (MUCH faster selection)
+        // @ts-ignore
+        child.geometry?.computeBoundsTree({indirect: true}); // indirect to avoid changing index order
+        // TODO: Accelerated raycast for lines and points (https://github.com/gkjohnson/three-mesh-bvh/issues/243)
+        // TODO: ParallelMeshBVHWorker
+
         // We could implement cutting planes using the stencil buffer:
         // https://threejs.org/examples/?q=clipping#webgl_clipping_stencil
         // But this is buggy for lots of models, so instead we just draw
@@ -192,112 +377,143 @@ function onModelLoad() {
           backChild.material = child.material.clone();
           backChild.material.side = BackSide;
           backChild.material.color = new Color(0.25, 0.25, 0.25)
+          backChild.userData.noHit = true;
           child.userData.backChild = backChild;
           childrenToAdd.push(backChild as MObject3D);
         }
       }
-      // if (child.type == 'Line' || child.type == 'LineSegments') {
-      // child.material.linewidth = 3; // Not supported in WebGL2
-      // If wide lines are really needed, we need https://threejs.org/examples/?q=line#webgl_lines_fat
-      // }
-      if (child.type == 'Points') {
-        (child.material as any).size = 5;
-        child.material.needsUpdate = true;
-      }
     }
   });
   childrenToAdd.forEach((child: MObject3D) => sceneModel.add(child));
-  scene.queueRender()
 
   // Furthermore...
   // Enabled features may have been reset after a reload
-  onEnabledFeaturesChange(enabledFeatures.value)
+  onEnabledFeaturesChange(enabledFeatures.value);
   // Opacity may have been reset after a reload
-  onOpacityChange(opacity.value)
+  onOpacityChange(opacity.value);
+  // Wireframe may have been reset after a reload
+  onWireframeChange(wireframe.value);
   // Clip planes may have been reset after a reload
-  onClipPlanesChange()
+  onClipPlanesChange();
+  // Edge width may have been reset after a reload
+  onEdgeWidthChange(edgeWidth.value);
+  // Explode may have been reset after a reload
+  if (explodeStrength.value > 0) nextTick(() => onExplodeChange(explodeStrength.value));
+
+  scene.queueRender()
 }
 
 // props.viewer.elem may not yet be available, so we need to wait for it
-props.viewer!!.onElemReady((elem) => elem.addEventListener('load', onModelLoad))
+const onViewerReady = (viewer: InstanceType<typeof ModelViewerWrapper>) => {
+  viewer?.onElemReady((elem: HTMLElement) => {
+    elem.addEventListener('before-render', onModelLoad);
+    elem.addEventListener('camera-change', onClipPlanesChange);
+  });
+};
+if (props.viewer) onViewerReady(props.viewer); else watch((() => props.viewer) as any, onViewerReady);
 </script>
 
 <template>
   <v-expansion-panel :value="modelName">
-    <v-expansion-panel-title expand-icon="hide-this-icon" collapse-icon="hide-this-icon">
-      <v-btn-toggle v-model="enabledFeatures" multiple @click.stop color="surface-light">
+    <v-expansion-panel-title>
+      <v-btn-toggle v-model="enabledFeatures" color="surface-light" multiple @click.stop>
         <v-btn icon>
           <v-tooltip activator="parent">Toggle Faces ({{ faceCount }})</v-tooltip>
-          <svg-icon type="mdi" :path="mdiRectangle" :rotate="90"></svg-icon>
+          <svg-icon :path="mdiRectangle" :rotate="90" type="mdi"></svg-icon>
         </v-btn>
         <v-btn icon>
           <v-tooltip activator="parent">Toggle Edges ({{ edgeCount }})</v-tooltip>
-          <svg-icon type="mdi" :path="mdiRectangleOutline" :rotate="90"></svg-icon>
+          <svg-icon :path="mdiRectangleOutline" :rotate="90" type="mdi"></svg-icon>
         </v-btn>
         <v-btn icon>
           <v-tooltip activator="parent">Toggle Vertices ({{ vertexCount }})</v-tooltip>
-          <svg-icon type="mdi" :path="mdiVectorRectangle" :rotate="90"></svg-icon>
+          <svg-icon :path="mdiVectorRectangle" :rotate="90" type="mdi"></svg-icon>
         </v-btn>
       </v-btn-toggle>
       <div class="model-name">{{ modelName }}</div>
       <v-spacer></v-spacer>
       <v-btn icon @click.stop="emit('remove')">
         <v-tooltip activator="parent">Remove</v-tooltip>
-        <svg-icon type="mdi" :path="mdiDelete"></svg-icon>
+        <svg-icon :path="mdiDelete" type="mdi"></svg-icon>
       </v-btn>
     </v-expansion-panel-title>
     <v-expansion-panel-text>
-      <v-slider v-model="opacity" hide-details min="0" max="1" :step="0.1">
+      <v-slider v-model="opacity" :step="0.1" hide-details max="1" min="0">
         <template v-slot:prepend>
           <v-tooltip activator="parent">Change opacity</v-tooltip>
-          <svg-icon type="mdi" :path="mdiCircleOpacity"></svg-icon>
+          <svg-icon :path="mdiCircleOpacity" type="mdi"></svg-icon>
+        </template>
+        <template v-slot:append>
+          <v-tooltip activator="parent">Wireframe</v-tooltip>
+          <v-checkbox-btn v-model="wireframe" falseIcon="mdi-triangle" trueIcon="mdi-triangle-outline"></v-checkbox-btn>
+        </template>
+      </v-slider>
+      <v-slider v-model="explodeStrength" hide-details max="1" min="0">
+        <template v-slot:prepend>
+          <v-tooltip activator="parent">Explode model</v-tooltip>
+          <svg-icon :path="mdiArrowExpand" type="mdi"></svg-icon>
+        </template>
+        <template v-slot:append>
+          <v-tooltip activator="parent">Swap explode direction (may go crazy)</v-tooltip>
+          <v-checkbox-btn v-model="explodeSwapped" falseIcon="mdi-checkbox-blank-outline"
+                          trueIcon="mdi-checkbox-marked-outline">
+            <template v-slot:label>
+              <svg-icon :path="mdiSwapHorizontal" type="mdi"></svg-icon>
+            </template>
+          </v-checkbox-btn>
+        </template>
+      </v-slider>
+      <v-slider v-if="edgeCount > 0 || vertexCount > 0" v-model="edgeWidth" hide-details max="1" min="0">
+        <template v-slot:prepend>
+          <v-tooltip activator="parent">Edge and vertex sizes</v-tooltip>
+          <svg-icon :path="mdiVectorLine" type="mdi"></svg-icon>
         </template>
       </v-slider>
       <v-divider></v-divider>
-      <v-slider v-model="clipPlaneX" hide-details min="0" max="1">
+      <v-slider v-model="clipPlaneX" hide-details max="1" min="0">
         <template v-slot:prepend>
           <v-tooltip activator="parent">Clip plane X</v-tooltip>
-          <svg-icon type="mdi" :path="mdiCube" :rotate="120"></svg-icon>
+          <svg-icon :path="mdiCube" :rotate="120" type="mdi"></svg-icon>
           X
         </template>
         <template v-slot:append>
           <v-tooltip activator="parent">Swap clip plane X</v-tooltip>
-          <v-checkbox-btn trueIcon="mdi-checkbox-marked-outline" falseIcon="mdi-checkbox-blank-outline"
-                          v-model="clipPlaneSwappedX">
+          <v-checkbox-btn v-model="clipPlaneSwappedX" falseIcon="mdi-checkbox-blank-outline"
+                          trueIcon="mdi-checkbox-marked-outline">
             <template v-slot:label>
-              <svg-icon type="mdi" :path="mdiSwapHorizontal"></svg-icon>
+              <svg-icon :path="mdiSwapHorizontal" type="mdi"></svg-icon>
             </template>
           </v-checkbox-btn>
         </template>
       </v-slider>
-      <v-slider v-model="clipPlaneY" hide-details min="0" max="1">
+      <v-slider v-model="clipPlaneZ" hide-details max="1" min="0">
         <template v-slot:prepend>
           <v-tooltip activator="parent">Clip plane Y</v-tooltip>
-          <svg-icon type="mdi" :path="mdiCube" :rotate="-120"></svg-icon>
+          <svg-icon :path="mdiCube" :rotate="-120" type="mdi"></svg-icon>
           Y
         </template>
         <template v-slot:append>
           <v-tooltip activator="parent">Swap clip plane Y</v-tooltip>
-          <v-checkbox-btn trueIcon="mdi-checkbox-marked-outline" falseIcon="mdi-checkbox-blank-outline"
-                          v-model="clipPlaneSwappedY">
+          <v-checkbox-btn v-model="clipPlaneSwappedZ" falseIcon="mdi-checkbox-blank-outline"
+                          trueIcon="mdi-checkbox-marked-outline">
             <template v-slot:label>
-              <svg-icon type="mdi" :path="mdiSwapHorizontal"></svg-icon>
+              <svg-icon :path="mdiSwapHorizontal" type="mdi"></svg-icon>
             </template>
           </v-checkbox-btn>
         </template>
       </v-slider>
-      <v-slider v-model="clipPlaneZ" hide-details min="0" max="1">
+      <v-slider v-model="clipPlaneY" hide-details max="1" min="0">
         <template v-slot:prepend>
           <v-tooltip activator="parent">Clip plane Z</v-tooltip>
-          <svg-icon type="mdi" :path="mdiCube"></svg-icon>
+          <svg-icon :path="mdiCube" type="mdi"></svg-icon>
           Z
         </template>
         <template v-slot:append>
           <v-tooltip activator="parent">Swap clip plane Z</v-tooltip>
-          <v-checkbox-btn trueIcon="mdi-checkbox-marked-outline" falseIcon="mdi-checkbox-blank-outline"
-                          v-model="clipPlaneSwappedZ">
+          <v-checkbox-btn v-model="clipPlaneSwappedY" falseIcon="mdi-checkbox-blank-outline"
+                          trueIcon="mdi-checkbox-marked-outline">
             <template v-slot:label>
-              <svg-icon type="mdi" :path="mdiSwapHorizontal"></svg-icon>
+              <svg-icon :path="mdiSwapHorizontal" type="mdi"></svg-icon>
             </template>
           </v-checkbox-btn>
         </template>
@@ -313,10 +529,6 @@ props.viewer!!.onElemReady((elem) => elem.addEventListener('load', onModelLoad))
 }
 
 /* More compact accordions */
-.v-expansion-panel {
-  margin-top: 0 !important;
-}
-
 .v-expansion-panel-title {
   padding: 0;
 }
@@ -327,15 +539,16 @@ props.viewer!!.onElemReady((elem) => elem.addEventListener('load', onModelLoad))
 }
 
 .v-btn {
-  --v-btn-height: 16px;
+  --v-btn-height: 12px;
 }
 
 .model-name {
-  width: 130px;
-  min-height: 1.15em; /* HACK: Avoid eating the bottom of the text when using 1 line */
-  max-height: 2em;
+  width: 172px;
+  font-size: 110%;
+  overflow-x: clip;
+  overflow-y: visible; /* HACK: bottom of text is lost otherwise (due to buggy -webkit-box bounds?) */
+  word-wrap: break-word;
   text-overflow: ellipsis;
-  overflow: hidden;
   display: -webkit-box;
   -webkit-line-clamp: 2; /* https://caniuse.com/?search=line-clamp */
   -webkit-box-orient: vertical;
@@ -347,10 +560,6 @@ props.viewer!!.onElemReady((elem) => elem.addEventListener('load', onModelLoad))
   padding: 0 !important;
 }
 
-.hide-this-icon {
-  display: none !important;
-}
-
 .mdi-checkbox-blank-outline { /* HACK: mdi is not fully imported, only required icons... */
   background-image: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M19,3H5C3.89,3 3,3.89 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V5C21,3.89 20.1,3 19,3M19,5V19H5V5H19Z"/></svg>');
 }
@@ -358,4 +567,12 @@ props.viewer!!.onElemReady((elem) => elem.addEventListener('load', onModelLoad))
 .mdi-checkbox-marked-outline { /* HACK: mdi is not fully imported, only required icons... */
   background-image: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M19,19H5V5H15V3H5C3.89,3 3,3.89 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V11H19M7.91,10.08L6.5,11.5L11,16L21,6L19.59,4.58L11,13.17L7.91,10.08Z"/></svg>');
 }
-</style>
+
+.mdi-triangle { /* HACK: mdi is not fully imported, only required icons... */
+  background-image: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M1 21h22L12 2"/></svg>');
+}
+
+.mdi-triangle-outline { /* HACK: mdi is not fully imported, only required icons... */
+  background-image: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M12 2L1 21h22M12 6l7.53 13H4.47"/></svg>');
+}
+</style>

frontend/models/Models.vue

@@ -1,4 +1,4 @@
-<script setup lang="ts">
+<script lang="ts" setup>
 import {VExpansionPanels} from "vuetify/lib/components/index.mjs";
 import type ModelViewerWrapper from "../viewer/ModelViewerWrapper.vue";
 import {Document, Mesh} from "@gltf-transform/core";
@@ -7,17 +7,17 @@ import Model from "./Model.vue";
 import {inject, ref, type Ref} from "vue";
 
 const props = defineProps<{ viewer: InstanceType<typeof ModelViewerWrapper> | null }>();
-const emit = defineEmits<{ remove: [string] }>()
+const emit = defineEmits<{ removeModel: [string] }>()
 
 let {sceneDocument} = inject<{ sceneDocument: Ref<Document> }>('sceneDocument')!!;
 
-let expandedNames = ref<Array<string>>([]);
+const expandedNames = ref<Array<string>>([]);
 
 function meshesList(sceneDocument: Document): Array<Array<Mesh>> {
   // Grouped by shared name
   return sceneDocument.getRoot().listMeshes().reduce((acc, mesh) => {
     let name = mesh.getExtras()[extrasNameKey]?.toString() ?? 'Unnamed';
-    let group = acc.find((group) => meshName(group[0]) === name);
+    let group = acc.find((group) => group[0] && meshName(group[0]) === name);
     if (group) {
       group.push(mesh);
     } else {
@@ -32,22 +32,20 @@ function meshName(mesh: Mesh) {
 }
 
 function onRemove(mesh: Mesh) {
-  emit('remove', meshName(mesh))
+  emit('removeModel', meshName(mesh))
 }
 
 function findModel(name: string) {
-  console.log('Find model', name);
   if (!expandedNames.value.includes(name)) expandedNames.value.push(name);
-  console.log('Expanded', expandedNames.value);
 }
 
 defineExpose({findModel})
 </script>
 
 <template>
-  <v-expansion-panels v-for="meshes in meshesList(sceneDocument)" :key="meshName(meshes[0])"
-                      v-model="expandedNames" multiple>
-    <model :meshes="meshes" :viewer="props.viewer" @remove="onRemove(meshes[0])"/>
+  <v-expansion-panels v-for="meshes in meshesList(sceneDocument)" :key="meshes[0] ? meshName(meshes[0]) : 'unnamed'"
+                      v-model="expandedNames as any" multiple>
+    <model :meshes="meshes" :viewer="props.viewer" @remove="meshes[0] ? onRemove(meshes[0]) : undefined"/>
   </v-expansion-panels>
 </template>
 
@@ -63,4 +61,4 @@ defineExpose({findModel})
 .v-overlay--active > .v-overlay__content {
   display: block !important; /* HACK: Fix buggy tooltips not showing? */
 }
-</style>
+</style>

frontend/shims.d.ts

@@ -1,3 +0,0 @@
-// Avoids typescript error when importing some files
-declare module '@jamescoyle/vue-icon'
-declare module 'three-orientation-gizmo/src/OrientationGizmo'

frontend/tools/LicensesDialogContent.vue

@@ -1,4 +1,4 @@
-<script setup lang="ts">
+<script lang="ts" setup>
 // License text for all dependencies, only downloaded when/if needed
 // @ts-ignore
 import licenseText from "../../assets/licenses.txt?raw";

frontend/tools/OrientationGizmo.vue

@@ -1,27 +1,32 @@
-<script setup lang="ts">
+<script lang="ts" setup>
 import {onMounted, onUpdated, ref} from "vue";
 import type {ModelScene} from "@google/model-viewer/lib/three-components/ModelScene";
+// @ts-expect-error
 import * as OrientationGizmoRaw from "three-orientation-gizmo/src/OrientationGizmo";
-import type {ModelViewerElement} from '@google/model-viewer';
+import type ModelViewerWrapper from "../viewer/ModelViewerWrapper.vue";
+import {currentSceneRotation} from "../viewer/lighting.ts";
 
 // Optimized minimal dependencies from three
 import {Vector3} from "three/src/math/Vector3.js";
 import {Matrix4} from "three/src/math/Matrix4.js";
+import {Euler} from "three/src/math/Euler.js";
 
-globalThis.THREE = {Vector3, Matrix4} as any // HACK: Required for the gizmo to work
+(globalThis as any).THREE = {Vector3, Matrix4} as any // HACK: Required for the gizmo to work
 
-const OrientationGizmo = OrientationGizmoRaw.default;
-
-const props = defineProps<{ elem: ModelViewerElement | null, scene: ModelScene }>();
+const props = defineProps<{ viewer: InstanceType<typeof ModelViewerWrapper> }>();
 
 function createGizmo(expectedParent: HTMLElement, scene: ModelScene): HTMLElement {
   // noinspection SpellCheckingInspection
   let gizmo = new OrientationGizmoRaw.default(scene.camera, {
     size: expectedParent.clientWidth,
     bubbleSizePrimary: expectedParent.clientWidth / 12,
-    bubbleSizeSeconday: expectedParent.clientWidth / 14,
-    fontSize: (expectedParent.clientWidth / 10) + "px"
+    bubbleSizeSeconday: expectedParent.clientWidth / 12,
+    fontSize: (expectedParent.clientWidth / 10) + "px",
   });
+  // Make sure all bubbles are labeled
+  for (let bubble of gizmo.bubbles) {
+    bubble.label = bubble.axis.toUpperCase();
+  }
   // HACK: Swap axes to fake the CAD orientation
   for (let swap of [["y", "-z"], ["z", "-y"], ["z", "-z"]]) {
     let indexA = gizmo.bubbles.findIndex((bubble: any) => bubble.axis == swap[0])
@@ -33,21 +38,26 @@ function createGizmo(expectedParent: HTMLElement, scene: ModelScene): HTMLElemen
   }
   // Append and listen for events
   gizmo.onAxisSelected = (axis: { direction: { x: any; y: any; z: any; }; }) => {
-    let lookFrom = scene.getCamera().position.clone();
-    let lookAt = scene.getTarget().clone().add(scene.target.position);
-    let magnitude = lookFrom.clone().sub(lookAt).length()
-    let direction = new Vector3(axis.direction.x, axis.direction.y, axis.direction.z);
-    let newLookFrom = lookAt.clone().add(direction.clone().multiplyScalar(magnitude));
-    //console.log("New camera position", newLookFrom)
-    scene.getCamera().position.copy(newLookFrom);
-    scene.getCamera().lookAt(lookAt);
-    if ((scene as any).__perspectiveCamera) { // HACK: Make the hacky ortho also work
-      (scene as any).__perspectiveCamera.position.copy(newLookFrom);
-      (scene as any).__perspectiveCamera.lookAt(lookAt);
+    if (!props.viewer.elem || !props.viewer.controls) return;
+    // Animate the controls to the new wanted angle
+    const controls = props.viewer.controls;
+    const {theta: curTheta/*, phi: curPhi*/} = (controls as any).goalSpherical;
+    let wantedTheta = NaN;
+    let wantedPhi = NaN;
+    let attempt = 0
+    while ((attempt == 0 || curTheta == wantedTheta) && attempt < 2) {
+      if (attempt > 0) { // Flip the camera if the user clicks on the same axis
+        axis.direction.x = -axis.direction.x;
+        axis.direction.y = -axis.direction.y;
+        axis.direction.z = -axis.direction.z;
+      }
+      wantedTheta = Math.atan2(axis.direction.x, axis.direction.z) + currentSceneRotation;
+      wantedPhi = Math.asin(-axis.direction.y) + Math.PI / 2;
+      attempt++;
     }
+    controls.setOrbit(wantedTheta, wantedPhi);
+    props.viewer.elem?.dispatchEvent(new CustomEvent('camera-change', {detail: {source: 'none'}}))
     scene.queueRender();
-    requestIdleCallback(() => props.elem?.dispatchEvent(
-        new CustomEvent('camera-change', {detail: {source: 'none'}})))
   }
   return gizmo;
 }
@@ -59,17 +69,22 @@ let gizmo: HTMLElement & { update: () => void }
 
 function updateGizmo() {
   if (gizmo.isConnected) {
+    // HACK: Update camera temporarily to match skybox rotation before updating the gizmo and go back
+    let prevRot = ((gizmo as any).camera).rotation.clone() as Euler;
+    let thetaMat = new Matrix4().makeRotationY(-currentSceneRotation);
+    ((gizmo as any).camera).rotation.setFromRotationMatrix(thetaMat.multiply(new Matrix4().makeRotationFromEuler(prevRot)));
     gizmo.update();
-    requestIdleCallback(updateGizmo);
+    ((gizmo as any).camera).rotation.set(prevRot.x, prevRot.y, prevRot.z);
+    requestIdleCallback(updateGizmo, {timeout: 250});
   }
 }
 
 let reinstall = () => {
-  if(!container.value) return;
+  if (!container.value) return;
   if (gizmo) container.value.removeChild(gizmo);
-  gizmo = createGizmo(container.value, props.scene as ModelScene) as typeof gizmo;
+  gizmo = createGizmo(container.value, props.viewer.scene!! as any) as typeof gizmo;
   container.value.appendChild(gizmo);
-  requestIdleCallback(updateGizmo); // Low priority updates
+  requestIdleCallback(updateGizmo, {timeout: 250}); // Low priority updates
 }
 onMounted(reinstall)
 onUpdated(reinstall);

frontend/tools/PlaygroundDialogContent.vue

@@ -0,0 +1,414 @@
+<script setup lang="ts">
+import {setupMonaco} from "./monaco.ts";
+import {VueMonacoEditor} from '@guolao/vue-monaco-editor'
+import {nextTick, onMounted, ref, shallowRef} from "vue";
+import Loading from "../misc/Loading.vue";
+import {newPyodideWorker} from "./pyodide-worker-api.ts";
+import {
+  mdiBroom,
+  mdiCircleOpacity,
+  mdiClose,
+  mdiContentSave,
+  mdiFolderOpen,
+  mdiPlay,
+  mdiReload,
+  mdiShare,
+  mdiUpload
+} from "@mdi/js";
+import {VBtn, VCard, VCardText, VSlider, VSpacer, VToolbar, VToolbarTitle, VTooltip} from "vuetify/components";
+// @ts-expect-error
+import SvgIcon from '@jamescoyle/vue-icon';
+import {version as pyodideVersion} from "pyodide";
+import {gzip} from 'pako';
+import {b64UrlEncode} from "./b64.ts";
+import {Base64} from 'js-base64'; // More compatible with binary data from python...
+import {NetworkUpdateEvent, NetworkUpdateEventModel} from "../misc/network.ts";
+import {settings} from "../misc/settings.ts";
+// @ts-expect-error
+import playgroundStartupCode from './PlaygroundStartup.py?raw';
+import {uploadFile} from "./upload-file.ts";
+
+const model = defineModel<{ code: string, firstTime: boolean }>({required: true}); // Initial code should only be set on first load!
+const emit = defineEmits<{ close: [], updateModel: [NetworkUpdateEvent] }>()
+
+// ============ LOAD MONACO EDITOR ============
+setupMonaco() // Must be called before using the editor
+
+const outputText = ref(``);
+
+function output(text: string) {
+  outputText.value += text; // Append to output
+  // Avoid too much output, keep it reasonable
+  let max_output = 10000; // 10k characters
+  if (outputText.value.length > max_output) {
+    outputText.value = outputText.value.slice(-max_output); // Keep only the last 10k characters
+  }
+  console.log(text); // Also log to console
+  nextTick(() => { // Scroll to bottom
+    const consoleElement = document.querySelector('.playground-console');
+    if (consoleElement) {
+      consoleElement.scrollTop = consoleElement.scrollHeight;
+    }
+  })
+}
+
+const MONACO_EDITOR_OPTIONS = {
+  automaticLayout: true,
+  formatOnType: true,
+  formatOnPaste: true,
+}
+
+const editorTheme = window.matchMedia("(prefers-color-scheme: dark)").matches ? `vs-dark` : `vs`
+const editor = shallowRef()
+const handleMount = (editorInstance: typeof VueMonacoEditor) => (editor.value = editorInstance)
+const opacity = ref(0.9); // Opacity for the editor (overriden when settings are loaded)
+
+// ============ LOAD PYODIDE (ASYNC) ============
+let pyodideWorker: ReturnType<typeof newPyodideWorker> | null = (import.meta as any).hot?.data?.pyodideWorker || null;
+const running = ref(true);
+
+async function setupPyodide(first: boolean, loadSnapshot: Uint8Array | undefined = undefined) {
+  running.value = true;
+  if (opacity.value == 0.0 && !first) opacity.value = 0.9; // User doesn't know how to show code again, reset after reopening
+  if (pyodideWorker === null) {
+    output("Creating new Pyodide worker...\n");
+    pyodideWorker = newPyodideWorker(Object.assign({
+      // Note: python wheels are downloaded from the CDN, as we can't know which ones are needed in advance to bundle them
+      // Furthermore, this lets us use the latest version of all wheels including ocp-specific ones without app updates
+      indexURL: `https://cdn.jsdelivr.net/pyodide/v${pyodideVersion}/full/`,
+      packages: ["micropip", "sqlite3"], // Faster load if done here
+      // _makeSnapshot: true, // Enable snapshotting for faster startup (still experimental: breaks loading any packages)
+    }, (loadSnapshot ? {_loadSnapshot: loadSnapshot} : {}))); // Load snapshot if provided
+    if ((import.meta as any).hot) (import.meta as any).hot.data.pyodideWorker = pyodideWorker
+  } else {
+    output("Reusing existing Pyodide instance...\n");
+  }
+  output("Preloading packages...\n");
+  await pyodideWorker.asyncRun(playgroundStartupCode, output, output); // Also import yacv_server and mock ocp_vscode here for faster custom code execution
+  running.value = false; // Indicate that Pyodide is ready
+  output("Pyodide worker ready.\n");
+}
+
+async function runCode() {
+  if (pyodideWorker === null) {
+    output("Pyodide worker is not initialized. Please wait...\n");
+    return;
+  }
+  if (running.value) {
+    output("Pyodide is already running. Please wait...\n");
+    return;
+  }
+  output("Running code...\n");
+  try {
+    running.value = true;
+    await pyodideWorker.asyncRun(model.value.code, output, (msg: string) => {
+      // Detect models printed to console (since http server is not available in pyodide)
+      if (msg.startsWith(yacvServerModelPrefix)) {
+        const modelData = msg.slice(yacvServerModelPrefix.length);
+        onModelData(modelData);
+      } else {
+        output(msg); // Print other messages directly
+      }
+    });
+  } catch (e) {
+    output(`Error running code: ${e}\n`);
+  } finally {
+    output("Code execution finished.\n");
+    running.value = false; // Indicate that Pyodide is ready
+  }
+}
+
+const yacvServerModelPrefix = "yacv_server://model/";
+
+function onModelData(modelData: string) {
+  output(`Model data detected... ${modelData.length}B\n`);
+  // Decode the model data and emit the event for the interface to handle
+  // - Start by finding the end of the initial json object by looking for brackets.
+  let i = 0;
+  let openBrackets = 0;
+  for (; i < modelData.length; i++) {
+    if (modelData[i] === '{') openBrackets++;
+    else if (modelData[i] === '}') openBrackets--;
+    if (openBrackets === 0) break; // Found the end of the JSON object
+  }
+  if (openBrackets !== 0) throw `Error: Invalid model data received: ${modelData}\n`
+  const jsonData = modelData.slice(0, i + 1); // Extract the JSON part and parse it into the proper class
+  let modelMetadataRaw = JSON.parse(jsonData);
+  const modelMetadata: any = new NetworkUpdateEventModel(modelMetadataRaw.name, "", modelMetadataRaw.hash, modelMetadataRaw.is_remove)
+  // console.debug(`Model metadata:`, modelMetadata);
+  output(`Model metadata: ${JSON.stringify(modelMetadata)}\n`);
+  // - Now decode the rest of the model data which is a single base64 encoded glb file (or an empty string)
+  if (!modelMetadata.isRemove) {
+    const binaryData = Base64.toUint8Array(modelData.slice(i + 1)); // Extract the base64 part
+    console.assert(binaryData.slice(0, 4).toString() == "103,108,84,70", // Ugly...
+        "Invalid GLTF binary data received: " + binaryData.slice(0, 4).toString());
+    // - Save for upload and share link feature
+    builtModelsGlb[modelMetadata.name] = binaryData;
+    // - Create a Blob from the binary data to be used as a URL
+    const blob = new Blob([binaryData as ArrayBufferView<ArrayBuffer>], {type: 'model/gltf-binary'});
+    modelMetadata.url = URL.createObjectURL(blob); // Set the hacked URL in the model metadata XXX: revoked on App.vue
+  } else {
+    delete builtModelsGlb[modelMetadata.name]; // Remove from built models if it's a remove request
+  }
+  // - Emit the event with the model metadata and URL
+  let networkUpdateEvent = new NetworkUpdateEvent([modelMetadata], () => {
+  });
+  emit('updateModel', networkUpdateEvent);
+}
+
+function resetWorker(loadSnapshot: Uint8Array | undefined = undefined) {
+  if (pyodideWorker) {
+    pyodideWorker.terminate(); // Terminate existing worker
+    pyodideWorker = null; // Reset worker reference
+  }
+  outputText.value = ``; // Clear output text
+  setupPyodide(false, loadSnapshot); // Reinitialize Pyodide
+}
+
+function shareLinkCommon(added: Record<string, Array<string> | string>, forgotten: Array<string>) {
+  const baseUrl = window.location
+  const searchParams = new URLSearchParams(baseUrl.search);
+  for (const k of forgotten) searchParams.delete(k);
+  const hashParams = new URLSearchParams(baseUrl.hash.slice(1)); // Keep all previous URL parameters
+  for (const k of forgotten) hashParams.delete(k);
+  for (const k in added) {
+    if (Array.isArray(added[k])) {
+      for (const v of added[k]) {
+        hashParams.append(k, v); // Prefer hash to GET
+      }
+    } else if (typeof added[k] === 'string') {
+      hashParams.set(k, added[k]); // Prefer hash to GET
+    }
+  }
+  const shareUrl = `${baseUrl.origin}${baseUrl.pathname}?${searchParams}#${hashParams}`;
+  output(`Share link ready: ${shareUrl}\n`)
+  if (navigator.clipboard?.writeText === undefined) {
+    output("Clipboard API not available. Please copy the link manually.\n");
+    return;
+  } else {
+    navigator.clipboard.writeText(shareUrl)
+        .then(() => output("Link copied to clipboard!\n"))
+        .catch(err => output(`Failed to copy link: ${err}\n`));
+  }
+}
+
+function shareLink() {
+  shareLinkCommon({'pg_code': b64UrlEncode(gzip(model.value.code, {level: 9}))}, ['pg_code']);
+}
+
+const builtModelsGlb: Record<string, Uint8Array> = {}; // Store built models to support uploading
+async function uploadAndShareLink() {
+  try {
+    output("Uploading files...\n");
+
+    // Upload code.py
+    const codeBlob = new Blob([model.value.code], {type: 'text/x-python'});
+    const newParams: Record<string, string | Array<string>> = {
+      'pg_code': await uploadFile('code.py', new Uint8Array(await codeBlob.arrayBuffer()))
+    };
+
+    // Upload all models
+    newParams['preload'] = []
+    for (const name in builtModelsGlb) {
+      const glb: any = builtModelsGlb[name];
+      const url = await uploadFile(name + '.glb', glb)
+      newParams['preload'].push(url); // Add to preload list
+    }
+
+    // Build share URL
+    return shareLinkCommon(newParams, ['pg_code'])
+  } catch (e) {
+    output(`Error uploading/sharing files: ${e}. Falling back to private share link.\n`);
+    return shareLink(); // Fallback to private share link if upload fails
+  }
+}
+
+function saveSnapshot() {
+  throw new Error("Not implemented yet!"); // TODO: Implement snapshot saving
+}
+
+function loadSnapshot() {
+  throw new Error("Not implemented yet!"); // TODO: Implement snapshot loading
+}
+
+(async () => {
+  const sett = await settings
+  if (model.value.firstTime) opacity.value = sett.pg_opacity_loading
+  await setupPyodide(true);
+  if (model.value.firstTime) {
+    await runCode();
+    opacity.value = sett.pg_opacity_loaded
+    model.value.firstTime = false
+  }
+})()
+
+// Add keyboard shortcuts
+const editorRef = ref<HTMLElement | null>(null);
+onMounted(() => {
+  if (editorRef.value) {
+    editorRef.value.addEventListener('keydown', (event: Event) => {
+      if (!(event instanceof KeyboardEvent)) return; // Ensure event is a KeyboardEvent
+      if (event.key === 'F10') { // Run code on F10
+        event.preventDefault(); // Prevent default behavior of the key
+        runCode();
+      } else if (event.key === 'Escape') { // Close on Escape key
+        emit('close');
+      }
+    });
+  }
+});
+</script>
+
+<template>
+  <v-card class="popup-card"
+          :style="opacity == 0 ? `position: absolute; top: calc(-50vh + 24px); width: calc(100vw - 64px);` : ``">
+    <v-toolbar class="popup">
+      <v-toolbar-title style="flex: 0 1 auto">Playground</v-toolbar-title>
+      <v-spacer></v-spacer>
+
+      <span style="display: inline-flex; margin-right: 16px;">
+        <svg-icon :path="mdiCircleOpacity" type="mdi" style="height: 32px"></svg-icon>
+        <v-slider v-model="opacity" :max="1" :min="0" :step="0.1"
+                  style="width: 100px; height: 32px">
+        </v-slider>
+        <v-tooltip activator="parent"
+                   location="bottom">Opacity of the editor (0 = hidden, 1 = fully visible)</v-tooltip>
+      </span>
+
+      <span style="padding-left: 12px; width: 48px;"><!-- This span is only needed to force tooltip to work while button is disabled -->
+        <v-btn icon disabled @click="saveSnapshot()">
+          <svg-icon :path="mdiContentSave" type="mdi"/>
+        </v-btn>
+        <v-tooltip activator="parent"
+                   location="bottom">Save current state to a snapshot for fast startup (WIP)</v-tooltip>
+      </span>
+      <span style="padding-right: 12px; width: 48px;"><!-- This span is only needed to force tooltip to work while button is disabled -->
+        <v-btn icon disabled @click="loadSnapshot()">
+          <svg-icon :path="mdiFolderOpen" type="mdi"/>
+        </v-btn>
+        <v-tooltip activator="parent" location="bottom">Load snapshot for fast startup (WIP)</v-tooltip>
+      </span>
+
+      <v-btn icon @click="shareLink()" style="padding-left: 12px;">
+        <svg-icon :path="mdiShare" type="mdi"/>
+        <v-tooltip activator="parent" location="bottom">Share link that automatically runs the code.<br/>Only people
+          with the link can see the code.
+        </v-tooltip>
+      </v-btn>
+
+      <v-btn icon @click="uploadAndShareLink()" style="padding-right: 12px">
+        <svg-icon :path="mdiShare" type="mdi" style="position: absolute; scale: 75%; top: 6px;"/>
+        <svg-icon :path="mdiUpload" type="mdi" style="position: absolute; scale: 75%; bottom: 6px;"/>
+        <v-tooltip activator="parent" location="bottom">Uploads all models and code and then shares a link to them.<br/>Useful
+          to view the models while the playground loads, but uses third-party storage.
+        </v-tooltip>
+      </v-btn>
+
+      <v-btn icon @click="resetWorker()" style="padding-left: 12px;">
+        <svg-icon :path="mdiReload" type="mdi"/>
+        <v-tooltip activator="parent" location="bottom">Reset Pyodide worker (this forgets all previous state and will
+          take a little while)
+        </v-tooltip>
+      </v-btn>
+
+      <v-btn icon @click="runCode()" :disabled="running" style="padding-right: 12px">
+        <svg-icon :path="mdiPlay" type="mdi"/>
+        <Loading v-if="running" style="position: absolute; top: -16%; left: -28%"/><!-- Ugly positioning -->
+        <v-tooltip activator="parent" location="bottom">Run code</v-tooltip>
+      </v-btn>
+
+      <v-btn icon @click="emit('close')">
+        <svg-icon :path="mdiClose" type="mdi"/>
+        <v-tooltip activator="parent" location="bottom">Close (Pyodide remains loaded)</v-tooltip>
+      </v-btn>
+    </v-toolbar>
+    <v-card-text class="popup-card-text" :style="opacity == 0 ? `display: none` : ``">
+      <!-- Only show content if opacity is greater than 0 -->
+      <div class="playground-container">
+        <div class="playground-editor" ref="editorRef">
+          <VueMonacoEditor v-model:value="model.code" :theme="editorTheme" :options="MONACO_EDITOR_OPTIONS"
+                           language="python" @mount="handleMount"/>
+        </div>
+        <div class="playground-console">
+          <h3 style="display:flex; align-items: center; justify-content: space-between; margin: 0;">
+            Console Output
+            <v-spacer></v-spacer>
+            <v-btn @click="outputText = ''">
+              <svg-icon :path="mdiBroom" type="mdi" class="h-"/>
+            </v-btn>
+          </h3>
+          <pre>{{ outputText }}</pre> <!-- Placeholder for console output -->
+          <Loading v-if="running"/>
+        </div>
+      </div>
+    </v-card-text>
+  </v-card>
+</template>
+
+<style scoped>
+.popup-card {
+  background-color: #00000000; /* Transparent background */
+}
+
+.v-toolbar.popup > * {
+  overflow-x: auto;
+}
+
+.popup-card-text {
+  background-color: #1e1e1e; /* Matches the Monaco editor background */
+  opacity: v-bind(opacity);
+}
+
+.playground-container {
+  display: flex;
+  flex-direction: row;
+}
+
+.playground-editor {
+  flex: 1;
+  height: calc(100vh - 150px);
+}
+
+.playground-console {
+  flex: 0.5;
+  padding: 10px;
+  overflow-y: auto;
+  min-width: 100px;
+  height: calc(100vh - 150px);
+}
+
+.playground-console pre {
+  margin: 0;
+  white-space: pre-wrap;
+  word-break: break-all;
+}
+
+@media (min-height: 100vw) {
+  /* Adjust layout for vertical space */
+  .playground-container {
+    flex-direction: column;
+  }
+
+  .playground-editor {
+    flex: 1;
+    min-height: 60vh;
+  }
+
+  .playground-editor > * {
+    min-height: 60vh;
+  }
+
+  .playground-console {
+    max-height: calc(40vh - 150px);
+  }
+}
+
+/* TODO: Adjust more colors on bright mode */
+</style>
+
+<style>
+/* https://stackoverflow.com/questions/47017753/monaco-editor-dynamically-resizable/71876526#71876526 */
+.monaco-editor {
+  position: absolute !important;
+}
+</style>

frontend/tools/PlaygroundStartup.py

@@ -0,0 +1,24 @@
+import micropip
+
+# Prioritize the OCP.wasm package repository for finding the ported dependencies.
+micropip.set_index_urls(["https://yeicor.github.io/OCP.wasm", "https://pypi.org/simple"])
+
+# For build123d < 0.10.0, we need to install the mock the py-lib3mf package (before the main install).
+await micropip.install("lib3mf")
+micropip.add_mock_package("py-lib3mf", "2.4.1", modules={"py_lib3mf": 'from lib3mf import *'})
+
+# Install the yacv_server package, which is the main server for the OCP.wasm playground; and also preinstalls build123d.
+await micropip.install("yacv_server", pre=True)
+
+# Preimport the yacv_server package to ensure it is available in the global scope, and mock the ocp_vscode package.
+from yacv_server import *
+
+micropip.add_mock_package("ocp-vscode", "2.8.9", modules={"ocp_vscode": 'from yacv_server import *'})
+show_object = show
+
+# Preinstall the font-fetcher package and install its hook to automatically download any requested font.
+await micropip.install("font-fetcher", pre=True)
+
+from font_fetcher.ocp import install_ocp_font_hook
+
+install_ocp_font_hook()

frontend/tools/Selection.vue

@@ -1,49 +1,56 @@
-<script setup lang="ts">
-import {defineModel, inject, ref, type ShallowRef, watch} from "vue";
+<script lang="ts" setup>
+import {inject, ref, type ShallowRef, watch} from "vue";
 import {VBtn, VSelect, VTooltip} from "vuetify/lib/components/index.mjs";
+// @ts-expect-error
 import SvgIcon from '@jamescoyle/vue-icon';
 import type {ModelViewerElement} from '@google/model-viewer';
 import type {ModelScene} from "@google/model-viewer/lib/three-components/ModelScene";
 import {mdiCubeOutline, mdiCursorDefaultClick, mdiFeatureSearch, mdiRuler} from '@mdi/js';
 import type {Intersection, Material, Mesh, Object3D} from "three";
-import {Box3, Matrix4, Raycaster, Vector3} from "three";
+import {Box3, Color, Raycaster, Vector3} from "three";
 import type ModelViewerWrapperT from "../viewer/ModelViewerWrapper.vue";
 import {extrasNameKey} from "../misc/gltf";
 import {SceneMgr} from "../misc/scene";
 import {Document} from "@gltf-transform/core";
 import {AxesColors} from "../misc/helpers";
 import {distances} from "../misc/distances";
+import {highlight, highlightUndo, hitToSelectionInfo, type SelectionInfo} from "./selection";
 
 export type MObject3D = Mesh & {
   userData: { noHit?: boolean },
-  material: Material & { color: { r: number, g: number, b: number }, __prevBaseColorFactor?: [number, number, number] }
+  material: Material & {
+    color: Color,
+    wireframe?: boolean
+  }
 };
 
 let props = defineProps<{ viewer: typeof ModelViewerWrapperT | null }>();
 let emit = defineEmits<{ findModel: [string] }>();
 let {setDisableTap} = inject<{ setDisableTap: (arg0: boolean) => void }>('disableTap')!!;
 let selectionEnabled = ref(false);
-let selected = defineModel<Array<Intersection<MObject3D>>>({default: []});
-let highlightNextSelection = ref([false, false]); // Second is whether selection was enabled before
+let selected = defineModel<Array<SelectionInfo>>({default: []});
+let openNextSelection = ref([false, false]); // Second is whether selection was enabled before
 let showBoundingBox = ref<Boolean>(false); // Enabled automatically on start
 let showDistances = ref<Boolean>(true);
 
 let mouseDownAt: [number, number] | null = null;
+let mouseDownTime = 0;
 let selectFilter = ref('Any (S)');
 const raycaster = new Raycaster();
 
 
-let selectionMoveListener = (event: MouseEvent) => {
+let mouseDownListener = (event: MouseEvent) => {
   mouseDownAt = [event.clientX, event.clientY];
+  mouseDownTime = performance.now();
   if (!selectionEnabled.value) return;
 };
 
-let selectionListener = (event: MouseEvent) => {
+let mouseUpListener = (event: MouseEvent) => {
   // If the mouse moved while clicked (dragging), avoid selection logic
   if (mouseDownAt) {
     let [x, y] = mouseDownAt;
     mouseDownAt = null;
-    if (Math.abs(event.clientX - x) > 5 || Math.abs(event.clientY - y) > 5) {
+    if (Math.abs(event.clientX - x) > 5 || Math.abs(event.clientY - y) > 5 || performance.now() - mouseDownTime > 500) {
       return;
     }
   }
@@ -54,15 +61,22 @@ let selectionListener = (event: MouseEvent) => {
   }
 
   // Set raycaster parameters
+  let paramScale = 1; // Make it easier to select vertices/edges based on camera distance
+  if (props.viewer?.scene) {
+    let scene = props.viewer.scene;
+    let lookAtCenter = scene.getTarget().clone().add(scene.target.position);
+    paramScale = scene.camera.position.distanceTo(lookAtCenter) / 150;
+    // console.log('paramScale', paramScale)
+  }
   if (selectFilter.value === 'Any (S)') {
-    raycaster.params.Line.threshold = 0.2;
-    raycaster.params.Points.threshold = 0.8;
+    raycaster.params.Line.threshold = paramScale;
+    raycaster.params.Points.threshold = paramScale * 2;  // Make vertices easier to select than edges
   } else if (selectFilter.value === '(E)dges') {
-    raycaster.params.Line.threshold = 0.8;
+    raycaster.params.Line.threshold = paramScale;
     raycaster.params.Points.threshold = 0.0;
   } else if (selectFilter.value === '(V)ertices') {
     raycaster.params.Line.threshold = 0.0;
-    raycaster.params.Points.threshold = 0.8;
+    raycaster.params.Points.threshold = paramScale;
   } else if (selectFilter.value === '(F)aces') {
     raycaster.params.Line.threshold = 0.0;
     raycaster.params.Points.threshold = 0.0;
@@ -74,7 +88,7 @@ let selectionListener = (event: MouseEvent) => {
   const ndcCoords = scene.getNDC(event.clientX, event.clientY);
   raycaster.setFromCamera(ndcCoords, scene.camera);
   if (!scene.camera.isPerspectiveCamera) {
-    // Need to fix the ray direction for ortho camera FIXME: Still buggy...
+    // Need to fix the ray direction for ortho camera FIXME: Still buggy for off-center clicks
     raycaster.ray.direction.copy(scene.camera.getWorldDirection(new Vector3()));
   }
   //console.log('Ray', raycaster.ray);
@@ -85,31 +99,69 @@ let selectionListener = (event: MouseEvent) => {
   // let lineHandle = props.viewer?.addLine3D(actualFrom, actualTo, "Ray")
   // setTimeout(() => props.viewer?.removeLine3D(lineHandle), 30000)
 
-  // Find all hit objects and select the wanted one based on the filter
-  const hits = raycaster.intersectObject(scene, true);
-  let hit = hits.find((hit: Intersection<Object3D>) => {
-    if (!hit.object || !(hit.object as any).isMesh) return false;
-    const kind = hit.object.type
+  // Find all hit objects and raycast the wanted ones based on the filter
+  let objects: Array<any> = [];
+  scene.traverse((obj) => {
+    const kind = obj.type
     let isFace = kind === 'Mesh' || kind === 'SkinnedMesh';
     let isEdge = kind === 'Line' || kind === 'LineSegments';
     let isVertex = kind === 'Points';
-    const kindOk = (selectFilter.value === 'Any (S)') ||
-        (isFace && selectFilter.value === '(F)aces') ||
-        (isEdge && selectFilter.value === '(E)dges') ||
-        (isVertex && selectFilter.value === '(V)ertices');
-    return hit.object.visible && !hit.object.userData.noHit && kindOk;
-  }) as Intersection<MObject3D> | undefined;
-  //console.log('Hit', hit)
+    if (obj.userData.noHit !== true &&
+        ((selectFilter.value === 'Any (S)' && (isFace || isEdge || isVertex)) ||
+            (selectFilter.value === '(F)aces' && isFace) ||
+            (selectFilter.value === '(E)dges' && isEdge) ||
+            (selectFilter.value === '(V)ertices' && isVertex))) {
+      objects.push(obj);
+    }
+  });
+  //console.log("Raycasting objects", objects)
 
-  if (!highlightNextSelection.value[0]) {
+  // Run the raycaster on the selected objects only searching for the first hit
+  // @ts-ignore
+  raycaster.firstHitOnly = true;
+  const hits = raycaster.intersectObjects(objects, false);
+  let hit = hits
+      // Check feasibility
+      .filter((hit: Intersection<Object3D>) => {
+        if (!hit.object) return false;
+        const kind = hit.object.type
+        let isFace = kind === 'Mesh' || kind === 'SkinnedMesh';
+        let isEdge = kind === 'Line' || kind === 'LineSegments';
+        let isVertex = kind === 'Points';
+        const kindOk = (selectFilter.value === 'Any (S)') ||
+            (isFace && selectFilter.value === '(F)aces') ||
+            (isEdge && selectFilter.value === '(E)dges') ||
+            (isVertex && selectFilter.value === '(V)ertices');
+        return (!isFace || hit.object.visible) && kindOk;
+      })
+      // Sort for highlighting partially hidden edges/vertices
+      .sort((a, b) => {
+        function lowerIsBetter(hit: Intersection<Object3D>) {
+          let score = hit.distance;
+          // Faces are easier to hit than 0-width edges/vertices, so we need to adjust scores
+          if (hit.object.type === 'Mesh' || hit.object.type === 'SkinnedMesh') score += paramScale;
+          // Edges are easier to hit than vertices, so we need to adjust scores
+          if (hit.object.type === 'Line' || hit.object.type === 'LineSegments') score += paramScale / 2;
+          return score;
+        }
+
+        return lowerIsBetter(a) - lowerIsBetter(b);
+      })
+      // Return the best hit
+      [0] as Intersection<MObject3D> | undefined;
+
+  if (!openNextSelection.value[0]) {
     // If we are selecting, toggle the selection or deselect all if no hit
-    if (hit) {
+    let selInfo: SelectionInfo | null = null;
+    if (hit) selInfo = hitToSelectionInfo(hit);
+    //console.log('Hit', hit, 'SelInfo', selInfo);
+    if (hit && selInfo !== null) {
       // Toggle selection
-      const wasSelected = selected.value.find((m) => m.object.name === hit?.object?.name) !== undefined;
+      const wasSelected = selected.value.find((m) => m.getKey() === selInfo.getKey()) !== undefined;
       if (wasSelected) {
-        deselect(hit)
+        deselect(selInfo)
       } else {
-        select(hit)
+        select(selInfo)
       }
     } else {
       deselectAll();
@@ -120,39 +172,27 @@ let selectionListener = (event: MouseEvent) => {
     // Otherwise, highlight the model that owns the hit
     emit('findModel', hit.object.userData[extrasNameKey])
     // And reset the selection mode
-    toggleHighlightNextSelection()
+    toggleOpenNextSelection()
   }
   scene.queueRender() // Force rerender of model-viewer
 }
 
-function select(hit: Intersection<MObject3D>) {
-  console.log('Selecting', hit.object.name)
-  if (selected.value.find((m) => m.object.name === hit.object.name) === undefined) {
-    selected.value.push(hit);
+function select(selInfo: SelectionInfo) {
+  // console.log('Selecting', selInfo.object.name)
+  if (selected.value.find((m) => m.getKey() === selInfo.getKey()) === undefined) {
+    selected.value.push(selInfo);
   }
-  hit.object.material.__prevBaseColorFactor = [
-    hit.object.material.color.r,
-    hit.object.material.color.g,
-    hit.object.material.color.b,
-  ];
-  hit.object.material.color.r = 1;
-  hit.object.material.color.g = 0;
-  hit.object.material.color.b = 0;
+  highlight(selInfo);
 }
 
-function deselect(hit: Intersection<MObject3D>, alsoRemove = true) {
-  console.log('Deselecting', hit.object.name)
+function deselect(selInfo: SelectionInfo, alsoRemove = true) {
+  // console.log('Deselecting', selInfo.object.name)
   if (alsoRemove) {
     // Remove the matching object from the selection
-    let toRemove = selected.value.findIndex((m) => m.object.name === hit.object.name);
+    let toRemove = selected.value.findIndex((m) => m.getKey() === selInfo.getKey());
     selected.value.splice(toRemove, 1);
   }
-  if (hit.object.material.__prevBaseColorFactor) {
-    hit.object.material.color.r = hit.object.material.__prevBaseColorFactor[0]
-    hit.object.material.color.g = hit.object.material.__prevBaseColorFactor[1]
-    hit.object.material.color.b = hit.object.material.__prevBaseColorFactor[2]
-    delete hit.object.material.__prevBaseColorFactor;
-  }
+  highlightUndo(selInfo);
 }
 
 function deselectAll(alsoRemove = true) {
@@ -170,17 +210,17 @@ function toggleSelection() {
   setDisableTap(selectionEnabled.value);
 }
 
-function toggleHighlightNextSelection() {
-  highlightNextSelection.value = [
-    !highlightNextSelection.value[0],
-    highlightNextSelection.value[0] ? highlightNextSelection.value[1] : selectionEnabled.value
+function toggleOpenNextSelection() {
+  openNextSelection.value = [
+    !openNextSelection.value[0],
+    openNextSelection.value[0] ? (openNextSelection.value[1] ?? false) : selectionEnabled.value
   ];
-  if (highlightNextSelection.value[0]) {
+  if (openNextSelection.value[0]) {
     // Reuse selection code to identify the model
     if (!selectionEnabled.value) toggleSelection()
   } else {
-    if (selectionEnabled.value !== highlightNextSelection.value[1]) toggleSelection()
-    highlightNextSelection.value = [false, false];
+    if (selectionEnabled.value !== openNextSelection.value[1]) toggleSelection()
+    openNextSelection.value = [false, false];
   }
 }
 
@@ -217,14 +257,29 @@ let onViewerReady = (viewer: typeof ModelViewerWrapperT) => {
   viewer.onElemReady((elem: ModelViewerElement) => {
     if (hasListeners) return;
     hasListeners = true;
-    elem.addEventListener('mouseup', selectionListener);
-    elem.addEventListener('mousedown', selectionMoveListener); // Avoid clicking when dragging
-    elem.addEventListener('load', () => {
+    elem.addEventListener('mousedown', mouseDownListener); // Avoid clicking when dragging
+    elem.addEventListener('mouseup', mouseUpListener);
+    elem.addEventListener('before-render', () => {
+      // After a reload of the scene, we need to recover object references and highlight them again
+      for (let sel of selected.value) {
+        let scene = props.viewer?.scene;
+        if (!scene) continue;
+        let foundObject = null;
+        scene.traverse((obj: MObject3D) => {
+          if (sel.matches(obj)) {
+            foundObject = obj as MObject3D;
+          }
+        });
+        if (foundObject) {
+          sel.object = foundObject;
+          highlight(sel);
+        } else {
+          selected.value = selected.value.filter((m) => m.getKey() !== sel.getKey());
+        }
+      }
       if (firstLoad) {
         toggleShowBoundingBox();
         firstLoad = false;
-      } else {
-        updateBoundingBox();
       }
     });
     elem.addEventListener('camera-change', onCameraChange);
@@ -249,11 +304,12 @@ function updateBoundingBox() {
   if (selected.value.length > 0) {
     bb = new Box3();
     for (let hit of selected.value) {
-      bb.expandByObject(hit.object);
+      bb.union(hit.getBox())
     }
-    bb.applyMatrix4(new Matrix4().makeTranslation(props.viewer?.scene.getTarget()));
   } else {
-    bb = SceneMgr.getBoundingBox(sceneDocument.value);
+    let boundingBox = SceneMgr.getBoundingBox(sceneDocument.value);
+    if (!boundingBox) return; // No models. Should not happen.
+    bb = boundingBox
   }
   // Define each edge of the bounding box, to draw a line for each axis
   let corners = [
@@ -274,14 +330,20 @@ function updateBoundingBox() {
   // Only draw one edge per axis, the 2nd closest one to the camera
   for (let edgeI in edgesByAxis) {
     let axisEdges = edgesByAxis[edgeI];
-    let edge: Array<number> = axisEdges[0];
+    if (!axisEdges || axisEdges.length === 0) continue;
+    let edge: Array<number> = axisEdges[0] ?? [];
     for (let i = 0; i < 2; i++) { // Find the 2nd closest one by running twice dropping the first
-      edge = axisEdges[0];
+      if (!axisEdges || axisEdges.length === 0) break;
+      edge = axisEdges[0] ?? [];
       let edgeDist = Infinity;
-      let cameraPos: Vector3 = props.viewer?.scene.camera.position;
+      let cameraPos: Vector3 = props.viewer?.scene?.camera?.position ?? new Vector3();
       for (let testEdge of axisEdges) {
-        let from = new Vector3(...corners[testEdge[0]]);
-        let to = new Vector3(...corners[testEdge[1]]);
+        if (!testEdge || testEdge.length < 2) continue;
+        let cornerA = corners[testEdge[0] ?? 0];
+        let cornerB = corners[testEdge[1] ?? 0];
+        if (!cornerA || !cornerB) continue;
+        let from = new Vector3(...cornerA);
+        let to = new Vector3(...cornerB);
         let mid = from.clone().add(to).multiplyScalar(0.5);
         let newDist = cameraPos.distanceTo(mid);
         if (newDist < edgeDist) {
@@ -291,17 +353,24 @@ function updateBoundingBox() {
       }
       axisEdges = axisEdges.filter((e) => e !== edge);
     }
-    let from = new Vector3(...corners[edge[0]]);
-    let to = new Vector3(...corners[edge[1]]);
-    let color = [AxesColors.x, AxesColors.y, AxesColors.z][edgeI][1]; // Secondary colors
+    if (!edge || edge.length < 2) continue;
+    let cornerA = corners[edge[0] ?? 0];
+    let cornerB = corners[edge[1] ?? 0];
+    if (!cornerA || !cornerB) continue;
+    let from = new Vector3(...cornerA);
+    let to = new Vector3(...cornerB);
+    let length = to.clone().sub(from).length();
+    if (length < 0.05) continue; // Skip very small edges (e.g. a single point)
+    let colorArray = [AxesColors.x, AxesColors.y, AxesColors.z][parseInt(edgeI)];
+    let color = colorArray ? colorArray[1] : [255, 255, 255]; // Secondary colors
     let lineCacheKey = JSON.stringify([from, to]);
     let matchingLine = boundingBoxLines[lineCacheKey];
     if (matchingLine) {
       boundingBoxLinesToRemove = boundingBoxLinesToRemove.filter((l) => l !== lineCacheKey);
     } else {
       let newLineId = props.viewer?.addLine3D(from, to,
-          to.clone().sub(from).length().toFixed(1) + "mm", {
-            "stroke": "rgb(" + color.join(',') + ")",
+          length.toFixed(1) + "mm", {
+            "stroke": "rgb(" + (color ?? [255, 255, 255]).join(',') + ")",
             "stroke-width": "2"
           });
       if (newLineId) {
@@ -337,7 +406,7 @@ function updateDistances() {
   let distanceLinesToRemove = Object.keys(distanceLines);
 
   function ensureLine(from: Vector3, to: Vector3, text: string, color: string) {
-    console.log('ensureLine', from, to, text, color)
+    // console.log('ensureLine', from, to, text, color)
     let lineCacheKey = JSON.stringify([from, to]);
     let matchingLine = distanceLines[lineCacheKey];
     if (matchingLine) {
@@ -352,12 +421,17 @@ function updateDistances() {
   }
 
   // Add lines (if not already added)
-  let objA = selected.value[0].object;
-  let objB = selected.value[1].object;
-  let {min, center, max} = distances(objA, objB, props.viewer?.scene);
-  ensureLine(max[0], max[1], max[1].distanceTo(max[0]).toFixed(1) + "mm", "orange");
-  ensureLine(center[0], center[1], center[1].distanceTo(center[0]).toFixed(1) + "mm", "green");
-  ensureLine(min[0], min[1], min[1].distanceTo(min[0]).toFixed(1) + "mm", "cyan");
+  if (!selected.value[0] || !selected.value[1] || !props.viewer?.scene) return;
+  let {min, center, max} = distances(selected.value[0], selected.value[1], props.viewer.scene);
+  if (max[0] && max[1]) {
+    ensureLine(max[0], max[1], max[1].distanceTo(max[0]).toFixed(1) + "mm", "orange");
+  }
+  if (center[0] && center[1]) {
+    ensureLine(center[0], center[1], center[1].distanceTo(center[0]).toFixed(1) + "mm", "green");
+  }
+  if (min[0] && min[1]) {
+    ensureLine(min[0], min[1], min[1].distanceTo(min[0]).toFixed(1) + "mm", "cyan");
+  }
 
   // Remove the lines that are no longer needed
   for (let lineLocator of distanceLinesToRemove) {
@@ -368,8 +442,14 @@ function updateDistances() {
   return;
 }
 
+defineExpose({deselect, updateBoundingBox, updateDistances});
+
 // Add keyboard shortcuts
 window.addEventListener('keydown', (event) => {
+  if ((event.target as any)?.tagName && ((event.target as any).tagName === 'INPUT' || (event.target as any).tagName === 'TEXTAREA')) {
+    // Ignore key events when an input is focused, except for text inputs
+    return;
+  }
   if (event.key === 's') {
     if (selectFilter.value == 'Any (S)') toggleSelection();
     else {
@@ -398,59 +478,48 @@ window.addEventListener('keydown', (event) => {
     toggleShowBoundingBox();
   } else if (event.key === 'd') {
     toggleShowDistances();
-  } else if (event.key === 'h') {
-    toggleHighlightNextSelection();
+  } else if (event.key === 'o') {
+    toggleOpenNextSelection();
   }
 });
 </script>
 
 <template>
-  <div class="select-parent">
-    <v-btn icon @click="toggleSelection" :color="selectionEnabled ? 'surface-light' : ''">
-      <v-tooltip activator="parent">{{ selectionEnabled ? 'Disable (s)election mode' : 'Enable (s)election mode' }}
-      </v-tooltip>
-      <svg-icon type="mdi" :path="mdiCursorDefaultClick"/>
-    </v-btn>
-    <v-tooltip :text="'Select only '  + selectFilter.toString().toLocaleLowerCase()" :open-on-click="false">
-      <template v-slot:activator="{ props }">
-        <v-select v-bind="props" class="select-only" variant="underlined"
-                  :items="['Any (S)', '(F)aces', '(E)dges', '(V)ertices']"
-                  v-model="selectFilter"/>
-      </template>
+  <v-btn :color="selectionEnabled ? 'surface-light' : ''" icon @click="toggleSelection">
+    <v-tooltip activator="parent">{{ selectionEnabled ? 'Disable (s)election mode' : 'Enable (s)election mode' }}
     </v-tooltip>
-  </div>
-  <v-btn icon @click="toggleHighlightNextSelection" :color="highlightNextSelection[0] ? 'surface-light' : ''">
-    <v-tooltip activator="parent">(H)ighlight the next clicked element in the models list</v-tooltip>
-    <svg-icon type="mdi" :path="mdiFeatureSearch"/>
+    <svg-icon :path="mdiCursorDefaultClick" type="mdi"/>
   </v-btn>
-  <v-btn icon @click="toggleShowBoundingBox" :color="showBoundingBox ? 'surface-light' : ''">
+  <v-tooltip :open-on-click="false" :text="'Select only '  + selectFilter.toString().toLocaleLowerCase()">
+    <template v-slot:activator="{ props }">
+      <v-select v-model="selectFilter" :items="['Any (S)', '(F)aces', '(E)dges', '(V)ertices']" class="select-only"
+                v-bind="props"
+                variant="underlined"/>
+    </template>
+  </v-tooltip>
+  <v-btn :color="openNextSelection[0] ? 'surface-light' : ''" icon @click="toggleOpenNextSelection">
+    <v-tooltip activator="parent">(O)pen the next clicked element in the models list</v-tooltip>
+    <svg-icon :path="mdiFeatureSearch" type="mdi"/>
+  </v-btn>
+  <v-btn :color="showBoundingBox ? 'surface-light' : ''" icon @click="toggleShowBoundingBox">
     <v-tooltip activator="parent">{{ showBoundingBox ? 'Hide selection (b)ounds' : 'Show selection (b)ounds' }}
     </v-tooltip>
-    <svg-icon type="mdi" :path="mdiCubeOutline"/>
+    <svg-icon :path="mdiCubeOutline" type="mdi"/>
   </v-btn>
-  <v-btn icon @click="toggleShowDistances" :color="showDistances ? 'surface-light' : ''">
+  <v-btn :color="showDistances ? 'surface-light' : ''" icon @click="toggleShowDistances">
     <v-tooltip activator="parent">
       {{ showDistances ? 'Hide selection (d)istances' : 'Show (d)istances (when a pair of features is selected)' }}
     </v-tooltip>
-    <svg-icon type="mdi" :path="mdiRuler"/>
+    <svg-icon :path="mdiRuler" type="mdi"/>
   </v-btn>
 </template>
 
 <style scoped>
-/* Very hacky styling... */
-.select-parent {
-  height: 48px;
-}
-
-.select-parent .v-btn {
-  position: relative;
-  top: -42px;
-}
-
 .select-only {
-  display: inline-block;
-  width: calc(100% - 48px);
+  float: right;
+  height: 36px;
   position: relative;
   top: -12px;
+  width: calc(100% - 48px);
 }
-</style>
+</style>

frontend/tools/Tools.vue

@@ -1,4 +1,4 @@
-<script setup lang="ts">
+<script lang="ts" setup>
 import {
   VBtn,
   VCard,
@@ -13,14 +13,26 @@ import {
 import OrientationGizmo from "./OrientationGizmo.vue";
 import type {PerspectiveCamera} from "three/src/cameras/PerspectiveCamera.js";
 import {OrthographicCamera} from "three/src/cameras/OrthographicCamera.js";
-import {mdiClose, mdiCrosshairsGps, mdiDownload, mdiGithub, mdiLicense, mdiProjector} from '@mdi/js'
+import {
+  mdiClose,
+  mdiCrosshairsGps,
+  mdiDownload,
+  mdiGithub,
+  mdiLicense,
+  mdiLightbulb,
+  mdiProjector,
+  mdiScriptTextPlay
+} from '@mdi/js'
+// @ts-expect-error
 import SvgIcon from '@jamescoyle/vue-icon';
 import type {ModelViewerElement} from '@google/model-viewer';
-import type {Intersection} from "three";
-import type {MObject3D} from "./Selection.vue";
 import Loading from "../misc/Loading.vue";
 import type ModelViewerWrapper from "../viewer/ModelViewerWrapper.vue";
-import {defineAsyncComponent, type Ref, ref} from "vue";
+import {defineAsyncComponent, ref} from "vue";
+import type {SelectionInfo} from "./selection";
+import {settings} from "../misc/settings.ts";
+import type {NetworkUpdateEvent} from "../misc/network.ts";
+import IfNotSmallBuild from "../misc/IfNotSmallBuild.vue";
 
 const SelectionComponent = defineAsyncComponent({
   loader: () => import("./Selection.vue"),
@@ -35,14 +47,29 @@ const LicensesDialogContent = defineAsyncComponent({
   delay: 0,
 });
 
+const PlaygroundDialogContent = defineAsyncComponent({
+  loader: () => import("./PlaygroundDialogContent.vue"),
+  loadingComponent: Loading,
+  delay: 0,
+});
+
 
 let props = defineProps<{ viewer: InstanceType<typeof ModelViewerWrapper> | null }>();
-const emit = defineEmits<{ findModel: [string] }>()
+const emit = defineEmits<{ findModel: [string], updateModel: [NetworkUpdateEvent] }>()
 
-let selection: Ref<Array<Intersection<MObject3D>>> = ref([]);
-let selectionFaceCount = () => selection.value.filter((s) => s.object.type == "Mesh" || s.object.type == "SkinnedMesh").length
-let selectionEdgeCount = () => selection.value.filter((s) => s.object.type == "Line").length
-let selectionVertexCount = () => selection.value.filter((s) => s.object.type == "Points").length
+const sett = ref<any | null>(null);
+const showPlaygroundDialog = ref(false);
+const pg_model = ref({code: '# Loading...', firstTime: false});
+(async () => {
+  sett.value = await settings;
+  pg_model.value = {code: sett.value.pg_code, firstTime: true};
+  showPlaygroundDialog.value = pg_model.value.code != "";
+})();
+
+let selection = ref<Array<SelectionInfo>>([]);
+let selectionFaceCount = () => selection.value.filter((s) => s.kind == 'face').length
+let selectionEdgeCount = () => selection.value.filter((s) => s.kind == 'edge').length
+let selectionVertexCount = () => selection.value.filter((s) => s.kind == "vertex").length
 
 function syncOrthoCamera(force: boolean) {
   let scene = props.viewer?.scene;
@@ -50,19 +77,21 @@ function syncOrthoCamera(force: boolean) {
   let perspectiveCam: PerspectiveCamera = (scene as any).__perspectiveCamera;
   if (force || perspectiveCam && scene.camera != perspectiveCam) {
     // Get zoom level from perspective camera
-    let dist = scene.getTarget().distanceToSquared(perspectiveCam.position);
-    let w = scene.aspect * dist ** 1.1 / 4000;
-    let h = dist ** 1.1 / 4000;
+    let lookAtCenter = scene.getTarget().clone().add(scene.target.position);
+    let perspectiveWidthAtCenter =
+        2 * Math.tan(perspectiveCam.fov * Math.PI / 180 / 2) * perspectiveCam.position.distanceTo(lookAtCenter);
+    let w = perspectiveWidthAtCenter;
+    let h = perspectiveWidthAtCenter / scene.aspect;
     (scene as any).camera = new OrthographicCamera(-w, w, h, -h, perspectiveCam.near, perspectiveCam.far);
     scene.camera.position.copy(perspectiveCam.position);
-    scene.camera.lookAt(scene.getTarget().clone().add(scene.target.position));
+    scene.camera.rotation.copy(perspectiveCam.rotation);
     if (force) scene.queueRender() // Force rerender of model-viewer
     requestAnimationFrame(() => syncOrthoCamera(false));
   }
 }
 
 let toggleProjectionText = ref('PERSP'); // Default to perspective camera
-function toggleProjection() {
+async function toggleProjection() {
   let scene = props.viewer?.scene;
   if (!scene) return;
   let prevCam = scene.camera;
@@ -77,16 +106,16 @@ function toggleProjection() {
     scene.queueRender() // Force rerender of model-viewer
   }
   toggleProjectionText.value = wasPerspectiveCamera ? 'ORTHO' : 'PERSP';
-  // The camera change may take a few frames to take effect, dispatch the event after a delay
-  requestIdleCallback(() => props.viewer?.elem?.dispatchEvent(
-      new CustomEvent('camera-change', {detail: {source: 'none'}})))
+  // The camera change may take a frame to take effect, dispatch the event after a delay
+  await new Promise((resolve) => requestAnimationFrame(resolve));
+  props.viewer?.elem?.dispatchEvent(new CustomEvent('camera-change', {detail: {source: 'none'}}));
 }
 
 async function centerCamera() {
   let viewerEl: ModelViewerElement | null | undefined = props.viewer?.elem;
   if (!viewerEl) return;
-  await viewerEl.updateFraming();
-  viewerEl.zoom(3);
+  props.viewer?.scene?.setTarget(0, 0, 0); // Center the target
+  viewerEl.zoom(-1000000); // Max zoom out
 }
 
 
@@ -99,15 +128,29 @@ async function downloadSceneGlb() {
   link.download = file.name;
   link.href = URL.createObjectURL(file);
   link.click();
+  URL.revokeObjectURL(link.href);
 }
 
 async function openGithub() {
   window.open('https://github.com/yeicor-3d/yet-another-cad-viewer', '_blank')
 }
 
+function removeObjectSelections(objName: string) {
+  for (let selInfo of selection.value.filter((s) => s.getObjectName() === objName)) {
+    selectionComp.value?.deselect(selInfo);
+  }
+  selectionComp.value?.updateBoundingBox();
+  selectionComp.value?.updateDistances();
+}
+
+defineExpose({removeObjectSelections, openPlayground: () => showPlaygroundDialog.value = true});
 
 // Add keyboard shortcuts
-window.addEventListener('keydown', (event) => {
+document.addEventListener('keydown', (event) => {
+  if ((event.target as any)?.tagName && ((event.target as any).tagName === 'INPUT' || (event.target as any).tagName === 'TEXTAREA')) {
+    // Ignore key events when an input is focused, except for text inputs
+    return;
+  }
   if (event.key === 'p') toggleProjection();
   else if (event.key === 'c') centerCamera();
   else if (event.key === 'd') downloadSceneGlb();
@@ -116,45 +159,66 @@ window.addEventListener('keydown', (event) => {
 </script>
 
 <template>
-  <orientation-gizmo :scene="props.viewer.scene as any" :elem="props.viewer.elem" v-if="props.viewer?.scene"/>
+  <orientation-gizmo v-if="props.viewer?.scene" :viewer="props.viewer"/>
   <v-divider/>
   <h5>Camera</h5>
   <v-btn icon @click="toggleProjection"><span class="icon-detail">{{ toggleProjectionText }}</span>
     <v-tooltip activator="parent">Toggle (P)rojection<br/>(currently
       {{ toggleProjectionText === 'PERSP' ? 'perspective' : 'orthographic' }})
     </v-tooltip>
-    <svg-icon type="mdi" :path="mdiProjector"></svg-icon>
+    <svg-icon :path="mdiProjector" type="mdi"></svg-icon>
   </v-btn>
   <v-btn icon @click="centerCamera">
     <v-tooltip activator="parent">Re(c)enter Camera</v-tooltip>
-    <svg-icon type="mdi" :path="mdiCrosshairsGps"/>
+    <svg-icon :path="mdiCrosshairsGps" type="mdi"/>
   </v-btn>
+  <span>
+    <v-tooltip activator="parent">To rotate the light hold shift and drag the mouse or use two fingers<br/>
+    Note that this breaks slightly clipping planes for now... (restart to fix)</v-tooltip>
+    <v-btn icon disabled style="background: black;">
+      <svg-icon :path="mdiLightbulb" type="mdi"/>
+    </v-btn>
+  </span>
   <v-divider/>
   <h5>Selection ({{ selectionFaceCount() }}F {{ selectionEdgeCount() }}E {{ selectionVertexCount() }}V)</h5>
-  <selection-component :ref="selectionComp as any" :viewer="props.viewer as any" v-model="selection"
-                       @findModel="(name) => emit('findModel', name)"/>
+  <selection-component ref="selectionComp" v-model="selection" :viewer="props.viewer as any"
+                       @findModel="(name: string) => emit('findModel', name)"/>
   <v-divider/>
   <v-spacer></v-spacer>
   <h5>Extras</h5>
-  <v-btn icon @click="downloadSceneGlb">
-    <v-tooltip activator="parent">(D)ownload Scene</v-tooltip>
-    <svg-icon type="mdi" :path="mdiDownload"/>
-  </v-btn>
-  <v-dialog id="licenses-dialog" fullscreen>
+  <v-dialog v-model="showPlaygroundDialog" persistent :scrim="false" attach="body">
     <template v-slot:activator="{ props }">
-      <v-btn icon v-bind="props">
-        <v-tooltip activator="parent">Show Licenses</v-tooltip>
-        <svg-icon type="mdi" :path="mdiLicense"/>
+      <v-btn v-bind="props" style="width: 100%">
+        <v-tooltip activator="parent">Open a python editor and build models directly in the browser!</v-tooltip>
+        <svg-icon :path="mdiScriptTextPlay" type="mdi"/>
+        &nbsp;Sandbox
       </v-btn>
     </template>
     <template v-slot:default="{ isActive }">
-      <v-card>
-        <v-toolbar>
+      <if-not-small-build>
+        <playground-dialog-content v-if="sett != null" v-model="pg_model" @close="isActive.value = false"
+                                   @update-model="(event: NetworkUpdateEvent) => emit('updateModel', event)"/>
+      </if-not-small-build>
+    </template>
+  </v-dialog>
+  <v-btn icon @click="downloadSceneGlb">
+    <v-tooltip activator="parent">(D)ownload Scene</v-tooltip>
+    <svg-icon :path="mdiDownload" type="mdi"/>
+  </v-btn>
+  <v-dialog>
+    <template v-slot:activator="{ props }">
+      <v-btn icon v-bind="props">
+        <v-tooltip activator="parent">Show Licenses</v-tooltip>
+        <svg-icon :path="mdiLicense" type="mdi"/>
+      </v-btn>
+    </template>
+    <template v-slot:default="{ isActive }">
+      <v-card style="height: 90vh">
+        <v-toolbar class="popup">
           <v-toolbar-title>Licenses</v-toolbar-title>
-          <v-spacer>
-          </v-spacer>
+          <v-spacer></v-spacer>
           <v-btn icon @click="isActive.value = false">
-            <svg-icon type="mdi" :path="mdiClose"/>
+            <svg-icon :path="mdiClose" type="mdi"/>
           </v-btn>
         </v-toolbar>
         <v-card-text>
@@ -165,7 +229,7 @@ window.addEventListener('keydown', (event) => {
   </v-dialog>
   <v-btn icon @click="openGithub">
     <v-tooltip activator="parent">Open (G)itHub</v-tooltip>
-    <svg-icon type="mdi" :path="mdiGithub"/>
+    <svg-icon :path="mdiGithub" type="mdi"/>
   </v-btn>
   <div ref="statsHolder"></div>
 </template>
@@ -185,4 +249,21 @@ window.addEventListener('keydown', (event) => {
   position: relative;
   top: 5px;
 }
-</style>
+
+h5 {
+  font-size: 14px;
+}
+
+.v-toolbar {
+  position: sticky !important;
+  top: 0;
+}
+
+.v-toolbar.popup {
+  height: 32px;
+}
+
+.v-toolbar.popup > div {
+  height: 32px !important;
+}
+</style>

frontend/tools/b64.ts

@@ -0,0 +1,21 @@
+export function b64UrlEncode(data: Uint8Array): string {
+    const base64 = btoa(String.fromCharCode(...data));
+    return base64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
+}
+
+export function b64UrlDecode(encoded: string): Uint8Array {
+    // Replace URL-safe characters with standard base64 characters
+    let base64 = encoded.replace(/-/g, '+').replace(/_/g, '/');
+    // Add padding if necessary
+    const padding = base64.length % 4;
+    if (padding) {
+        base64 += '='.repeat(4 - padding);
+    }
+    // Decode the base64 string to a byte array
+    const binaryString = atob(base64);
+    const byteArray = new Uint8Array(binaryString.length);
+    for (let i = 0; i < binaryString.length; i++) {
+        byteArray[i] = binaryString.charCodeAt(i);
+    }
+    return byteArray;
+}

frontend/tools/monaco.ts

@@ -0,0 +1,35 @@
+import {loader} from "@guolao/vue-monaco-editor"
+
+import * as monaco from "monaco-editor"
+//@ts-ignore
+import editorWorker from "monaco-editor/esm/vs/editor/editor.worker?worker"
+//@ts-ignore
+import jsonWorker from "monaco-editor/esm/vs/language/json/json.worker?worker"
+//@ts-ignore
+import cssWorker from "monaco-editor/esm/vs/language/css/css.worker?worker"
+//@ts-ignore
+import htmlWorker from "monaco-editor/esm/vs/language/html/html.worker?worker"
+//@ts-ignore
+import tsWorker from "monaco-editor/esm/vs/language/typescript/ts.worker?worker"
+
+(self as any).MonacoEnvironment = {
+    getWorker(_: any, label: string) {
+        if (label === "json") {
+            return new jsonWorker()
+        }
+        if (label === "css" || label === "scss" || label === "less") {
+            return new cssWorker()
+        }
+        if (label === "html" || label === "handlebars" || label === "razor") {
+            return new htmlWorker()
+        }
+        if (label === "typescript" || label === "javascript") {
+            return new tsWorker()
+        }
+        return new editorWorker()
+    }
+}
+
+export function setupMonaco() {
+    loader.config({monaco})
+}

frontend/tools/pyodide-worker-api.ts

@@ -0,0 +1,45 @@
+import type {loadPyodide} from "pyodide";
+import type {MessageEventDataIn} from "./pyodide-worker.ts";
+
+let requestId = 0;
+
+/** Simple API for the Pyodide worker. */
+export function newPyodideWorker(initOpts: Parameters<typeof loadPyodide>[0]) {
+    let worker = new Worker(new URL('./pyodide-worker.ts', import.meta.url), {type: "module"});
+    worker.postMessage(initOpts);
+    const commonRequestResponse = (event: MessageEventDataIn, stdout?: (msg: string) => void, stderr?: (msg: string) => void) => {
+        return new Promise((resolve, reject) => {
+            worker.addEventListener("message", function listener(event: MessageEvent) {
+                if (stdout && event.data?.stdout) {
+                    stdout(event.data.stdout); // No clue if associated with this request, but we handle it anyway.
+                    return;
+                }
+                if (stderr && event.data?.stderr) {
+                    stderr(event.data.stderr); // No clue if associated with this request, but we handle it anyway.
+                    return;
+                }
+                if (event.data?.id !== event.data.id) return; // Ignore messages that are not for this request.
+                if (event.data?.error) {
+                    worker.removeEventListener("message", listener);
+                    reject(event.data.error);
+                } else if (event.data?.hasOwnProperty("result")) {
+                    worker.removeEventListener("message", listener);
+                    resolve(event.data.result);
+                } else {
+                    throw new Error("Unexpected message from worker: " + JSON.stringify(event.data));
+                }
+            })
+            worker.postMessage(event);
+        });
+    }
+    return {
+        asyncRun: (code: string, stdout: (msg: string) => void, stderr: (msg: string) => void) =>
+            commonRequestResponse({type: "asyncRun", id: requestId++, code}, stdout, stderr),
+        mkdirTree: (path: string) => commonRequestResponse({type: "mkdirTree", id: requestId++, path}),
+        writeFile: (path: string, content: string) =>
+            commonRequestResponse({type: "writeFile", id: requestId++, path, content}),
+        makeSnapshot: () => commonRequestResponse({type: "makeSnapshot", id: requestId++}),
+        terminate: () => worker.terminate()
+    }
+}
+

frontend/tools/pyodide-worker.ts

@@ -0,0 +1,83 @@
+import {loadPyodide, type PyodideAPI} from "pyodide";
+
+let myLoadPyodide = (initOpts: Parameters<typeof loadPyodide>[0]) => loadPyodide({
+    ...initOpts,
+    stdout: (msg) => self.postMessage({stdout: msg + "\n"}), // Add newline for better readability
+    stderr: (msg) => self.postMessage({stderr: msg + "\n"}), // Add newline for better readability
+    stdin: () => {
+        console.warn("Input requested by Python code, but stdin is not supported in this playground.");
+        return "";
+    },
+});
+
+let pyodideReadyPromise: Promise<PyodideAPI> | null = null;
+
+export type MessageEventDataIn = {
+    type: 'asyncRun';
+    id: number;
+    code: string;
+} | {
+    type: 'mkdirTree';
+    id: number;
+    path: string;
+} | {
+    type: 'writeFile';
+    id: number;
+    path: string;
+    content: string;
+} | {
+    type: 'makeSnapshot';
+    id: number;
+}
+
+self.onmessage = async (event: MessageEvent<MessageEventDataIn>) => {
+    if (!pyodideReadyPromise) { // First message is always the init message
+        // If we haven't loaded Pyodide yet, do so now.
+        // This is a singleton, so we only load it once.
+        pyodideReadyPromise = myLoadPyodide(event.data as Parameters<typeof loadPyodide>[0]);
+        return;
+    }
+    if (event.data.type === 'mkdirTree') {
+        // Create a directory tree in the Pyodide filesystem.
+        const pyodide = await pyodideReadyPromise;
+        try {
+            await pyodide.FS.mkdirTree(event.data.path);
+            self.postMessage({id: event.data.id, result: true});
+        } catch (error: any) {
+            self.postMessage({id: event.data.id, error: error.message});
+        }
+        return;
+    } else if (event.data.type === 'writeFile') {
+        // Write a file to the Pyodide filesystem.
+        const pyodide = await pyodideReadyPromise;
+        try {
+            await pyodide.FS.writeFile(event.data.path, event.data.content);
+            self.postMessage({id: event.data.id, result: true});
+        } catch (error: any) {
+            self.postMessage({id: event.data.id, error: error.message});
+        }
+    } else if (event.data.type === 'asyncRun') {
+        let code = event.data.code;
+        // make sure loading is done
+        const pyodide = await pyodideReadyPromise;
+        // Now load any packages we need, run the code, and send the result back.
+        await pyodide.loadPackagesFromImports(code);
+        try {
+            self.postMessage({id: event.data.id, result: await pyodide.runPythonAsync(code)});
+        } catch (error: any) {
+            self.postMessage({id: event.data.id, error: error.message});
+        }
+    } else if (event.data.type === 'makeSnapshot') {
+        // Take a snapshot of the current Pyodide filesystem.
+        const pyodide = await pyodideReadyPromise;
+        try {
+            const snapshot = pyodide.makeMemorySnapshot();
+            self.postMessage({id: event.data.id, result: snapshot});
+        } catch (error: any) {
+            self.postMessage({id: event.data.id, error: error.message});
+        }
+    } else {
+        console.error("Unknown message type:", (event.data as any)?.type);
+        self.postMessage({id: (event.data as any)?.id, error: "Unknown message type: " + (event.data as any)?.type});
+    }
+};

frontend/tools/selection.ts

@@ -0,0 +1,182 @@
+// Model management from the graphics side
+
+import type { MObject3D } from "./Selection.vue";
+import type { Intersection } from "three";
+import { Box3 } from "three";
+import { extrasNameKey } from "../misc/gltf";
+
+/** Information about a single item in the selection */
+export class SelectionInfo {
+  /** The object which was (partially) selected */
+  object: MObject3D;
+  /** The type of the selection */
+  kind: "face" | "edge" | "vertex";
+  /** Start and end indices of the primitives in the geometry */
+  indices: [number, number];
+
+  constructor(object: MObject3D, kind: "face" | "edge" | "vertex", indices: [number, number]) {
+    this.object = object;
+    this.kind = kind;
+    this.indices = indices;
+  }
+
+  public getObjectName() {
+    return this.object.userData[extrasNameKey];
+  }
+
+  public matches(object: MObject3D) {
+    return (
+      this.getObjectName() === object.userData[extrasNameKey] &&
+      ((this.kind === "face" && (object.type === "Mesh" || object.type === "SkinnedMesh")) ||
+        (this.kind === "edge" && (object.type === "Line" || object.type === "LineSegments")) ||
+        (this.kind === "vertex" && object.type === "Points"))
+    );
+  }
+
+  public getKey() {
+    return this.object.uuid + this.kind + this.indices[0].toFixed() + this.indices[1].toFixed();
+  }
+
+  public getBox(): Box3 {
+    let index = this.object.geometry.index || { getX: (i: number) => i };
+    let pos = this.object.geometry.getAttribute("position");
+    let min = [Infinity, Infinity, Infinity];
+    let max = [-Infinity, -Infinity, -Infinity];
+    for (let i = this.indices[0]; i < this.indices[1]; i++) {
+      let vertIndex = index!.getX(i);
+      let x = pos.getX(vertIndex);
+      let y = pos.getY(vertIndex);
+      let z = pos.getZ(vertIndex);
+      min[0] = Math.min(min[0] ?? Infinity, x);
+      min[1] = Math.min(min[1] ?? Infinity, y);
+      min[2] = Math.min(min[2] ?? Infinity, z);
+      max[0] = Math.max(max[0] ?? -Infinity, x);
+      max[1] = Math.max(max[1] ?? -Infinity, y);
+      max[2] = Math.max(max[2] ?? -Infinity, z);
+    }
+    return new Box3().setFromArray([...min, ...max]);
+  }
+}
+
+export function hitToSelectionInfo(hit: Intersection<MObject3D>): SelectionInfo | null {
+  let kind = hit.object.type;
+  if (kind == "Mesh" || kind == "SkinnedMesh") {
+    let indices = hitFaceTriangleIndices(hit);
+    if (indices === null) return null;
+    return new SelectionInfo(hit.object, "face", indices);
+  } else if (kind == "Line" || kind == "LineSegments") {
+    // Select raw lines, not the wide meshes representing them
+    // This is because the indices refer to the raw lines, not the wide meshes
+    // Furthermore, this allows better "fuzzy" raycasting logic
+    let indices = hitEdgePointIndices(hit);
+    if (indices === null) return null;
+    return new SelectionInfo(hit.object, "edge", indices);
+  } else if (kind == "Points") {
+    if (hit.index === undefined) return null;
+    return new SelectionInfo(hit.object, "vertex", [hit.index, hit.index + 1]);
+  }
+  return null;
+}
+
+function hitFaceTriangleIndices(hit: Intersection<MObject3D>): [number, number] | null {
+  let faceTrianglesEnd = hit?.object?.geometry?.userData?.face_triangles_end;
+  if (!hit.faceIndex) return null;
+  if (!faceTrianglesEnd) {
+    // Fallback to selecting the whole imported mesh
+    //console.log("No face_triangles_end found, selecting the whole mesh");
+    return [0, (hit.object.geometry.index ?? hit.object.geometry.attributes.position)?.count ?? 0];
+  } else {
+    // Normal CAD model
+    let rawIndex = hit.faceIndex * 3; // Faces are triangles with 3 indices
+    for (let i = 0; i < faceTrianglesEnd.length; i++) {
+      let faceSwapIndex = faceTrianglesEnd[i];
+      if (rawIndex < faceSwapIndex) {
+        let start = i === 0 ? 0 : faceTrianglesEnd[i - 1];
+        return [start, faceTrianglesEnd[i]];
+      }
+    }
+  }
+  return null;
+}
+
+function hitEdgePointIndices(hit: Intersection<MObject3D>): [number, number] | null {
+  let edgePointsEnd = hit?.object?.geometry?.userData?.edge_points_end;
+  if (!edgePointsEnd || hit.index === undefined) return null;
+  let rawIndex = hit.index; // Faces are triangles with 3 indices
+  for (let i = 0; i < edgePointsEnd.length; i++) {
+    let edgeSwapIndex = edgePointsEnd[i];
+    if (rawIndex < edgeSwapIndex) {
+      let start = i === 0 ? 0 : edgePointsEnd[i - 1];
+      return [start, edgePointsEnd[i]];
+    }
+  }
+  return null;
+}
+
+function applyColor(
+  selInfo: SelectionInfo,
+  colorAttribute: any,
+  color: [number, number, number, number],
+): [number, number, number, number] {
+  let index = selInfo.object.geometry.index;
+  let prevColor: [number, number, number, number] | null = null;
+  if (colorAttribute !== undefined) {
+    for (let i = selInfo.indices[0]; i < selInfo.indices[1]; i++) {
+      let vertIndex = index!.getX(i);
+      if (prevColor === null)
+        prevColor = [
+          colorAttribute.getX(vertIndex),
+          colorAttribute.getY(vertIndex),
+          colorAttribute.getZ(vertIndex),
+          colorAttribute.getW(vertIndex),
+        ];
+      colorAttribute.setXYZW(vertIndex, color[0], color[1], color[2], color[3]);
+    }
+    colorAttribute.needsUpdate = true;
+    if (selInfo.object.userData.niceLine !== undefined) {
+      // Need to update the color of the nice line as well
+      let indexAttribute = selInfo.object.geometry.index!!;
+      let allNewColors = [];
+      for (let i = 0; i < indexAttribute.count; i++) {
+        if (indexAttribute.getX(i) >= selInfo.indices[0] && indexAttribute.getX(i) < selInfo.indices[1]) {
+          allNewColors.push(color[0], color[1], color[2]);
+        } else {
+          allNewColors.push(
+            colorAttribute.getX(indexAttribute.getX(i)),
+            colorAttribute.getY(indexAttribute.getX(i)),
+            colorAttribute.getZ(indexAttribute.getX(i)),
+          );
+        }
+      }
+      selInfo.object.userData.niceLine.geometry.setColors(allNewColors);
+      for (let attribute of Object.values(selInfo.object.userData.niceLine.geometry.attributes)) {
+        (attribute as any).needsUpdate = true;
+      }
+    }
+  } else {
+    // Fallback to tinting the whole mesh for imported models
+    //console.log("No color attribute found, tinting the whole mesh")
+    let tmpPrevColor = selInfo.object.material.color;
+    prevColor = [tmpPrevColor.r, tmpPrevColor.g, tmpPrevColor.b, 1];
+    selInfo.object.material.color.setRGB(color[0], color[1], color[2]);
+    selInfo.object.material.needsUpdate = true;
+  }
+  return prevColor!;
+}
+
+export function highlight(selInfo: SelectionInfo): void {
+  // Update the color of all the triangles in the face
+  let geometry = selInfo.object.geometry;
+  let colorAttr = selInfo.object.geometry.getAttribute("color");
+  geometry.userData.savedColor = geometry.userData.savedColor || {};
+  geometry.userData.savedColor[selInfo.getKey()] = applyColor(selInfo, colorAttr, [1.0, 0.0, 0.0, 1.0]);
+}
+
+export function highlightUndo(selInfo: SelectionInfo): void {
+  // Update the color of all the triangles in the face
+  let geometry = selInfo.object.geometry;
+  let colorAttr = selInfo.object.geometry.getAttribute("color");
+  let savedColor = geometry.userData.savedColor[selInfo.getKey()];
+  applyColor(selInfo, colorAttr, savedColor);
+  delete geometry.userData.savedColor[selInfo.getKey()];
+}

frontend/tools/upload-file.ts

@@ -0,0 +1,91 @@
+//@ts-expect-error
+import encryptCode from "tanmayo7lock?raw";
+
+function encrypt(msg: string, secret: string = "hudfhgd8fghdfgh3uhuifdgh"): string {
+    let exports: any = {};
+    eval(encryptCode.replace("exports.encrypt = encrypt;", "exports.LargeDataCrypto = LargeDataCrypto;\nexports.encrypt = encrypt;"));
+    return exports.LargeDataCrypto.encrypt(msg, secret);
+}
+
+async function check(lockerName: string) {
+    const fileUrl = `https://vouz-backend.onrender.com/api/check_key`;
+    const response = await fetch(fileUrl, {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json',
+            'Accept': 'application/json'
+        },
+        body: JSON.stringify({name: encrypt(lockerName), key: encrypt(lockerName)}),
+    });
+    if (!response.ok) throw new Error(`Failed to get file URL: ${response.status} ${response.statusText} -- ${await response.text()}`);
+    const status = await response.json();
+    return {response, status};
+}
+
+export async function uploadFile(name: string, data: Uint8Array): Promise<string> {
+    // "Free" storage, let's see how long it lasts...
+    // Create a locker
+    const lockerUrl = `https://vouz-backend.onrender.com/api/locker`
+    const lockerName = `yacv-pg-${name}-${Date.now()}`; // Unique locker name
+    let responsePromise = fetch(lockerUrl, {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json',
+            'Accept': 'application/json'
+        },
+        body: JSON.stringify({name: encrypt(lockerName), passkey: encrypt(lockerName)}),
+    });
+
+    // The previous request never answers 🤮
+    responsePromise.then((response) => console.warn(`Locker creation response: ${response.status} ${response.statusText} -- ${response.headers.get('Content-Type')}`));
+    // Instead, poll the check endpoint until the locker is created
+    let i: number;
+    for (i = 0; i < 10; i++) {
+        await new Promise(resolve => setTimeout(resolve, 250)); // Wait a bit before checking
+        try {
+            let {status} = await check(lockerName);
+            if (status && status.data && status.data.length == 0) break // Locker is created
+        } catch (e) { // Ignore errors, they will be thrown later
+        }
+    }
+    if (i >= 10) throw new Error(`Failed to create locker after 10 attempts: ${lockerName}`);
+
+    // Upload file to the locker
+    const uploadUrl = `https://vouz-backend.onrender.com/api/upload`;
+    const formData = new FormData();
+    formData.append('file', new Blob([data as ArrayBufferView<ArrayBuffer>], {type: 'application/octet-stream'}), name);
+    formData.append("name", encrypt(lockerName));
+    formData.append("passkey", encrypt(lockerName));
+    const response = await fetch(uploadUrl, {
+        method: 'POST',
+        body: formData,
+    })
+    if (!response.ok) throw new Error(`Failed to upload file: ${response.status} ${response.statusText} -- ${await response.text()}`);
+
+    // Fake URL for retrieveFile to work
+    return "https://vouz.tech#name=" + encodeURIComponent(name) + "&locker=" + encodeURIComponent(lockerName);
+}
+
+/** Given any URL, it retrieves the file, with custom code for the vouz.tech locker. */
+export async function retrieveFile(url: string): Promise<Response> {
+    let realUrl = url;// Normal fetch if the URL is not a vouz.tech locker URL
+    if (url.indexOf("https://vouz.tech#") !== -1) { // Check if the URL is a vouz.tech locker URL
+        // Parse the URL to get the locker name and file name
+        const urlObj = new URL(url);
+        const hashParams = new URLSearchParams(urlObj.hash.slice(1)); // Remove the leading '#'
+        const lockerName = hashParams.get('locker') || (() => {
+            throw new Error("Locker name not found in URL hash")
+        })();
+        const name = hashParams.get('name') || (() => {
+            throw new Error("File name not found in URL hash")
+        })();
+        // Get the URL of the uploaded file
+        let {status} = await check(lockerName);
+        if (!status || !status.data || status.data.length == 0 || !status.data[0].url) {
+            throw new Error(`No file URL found in response: ${JSON.stringify(status)}`);
+        }
+        console.debug("File access requested successfully, URL:", status.data[0].url);
+        realUrl = "https://corsproxy.io/?url=" + status.data[0].url + "#name=" + encodeURIComponent(name) + "&locker=" + encodeURIComponent(lockerName);
+    }
+    return await fetch(realUrl);
+}

frontend/viewer/ModelViewerWrapper.vue

@@ -1,44 +1,122 @@
-<script lang="ts">
-</script>
-
-<script setup lang="ts">
+<script lang="ts" setup>
 import {settings} from "../misc/settings";
-import {onMounted, inject, type Ref} from "vue";
-import {$scene, $renderer} from "@google/model-viewer/lib/model-viewer-base";
-import Loading from "../misc/Loading.vue";
-import {ref, watch} from "vue";
+import {inject, onUpdated, type Ref, ref, watch} from "vue";
+import {$renderer, $scene} from "@google/model-viewer/lib/model-viewer-base";
+import {$controls} from '@google/model-viewer/lib/features/controls.js';
+import {type SmoothControls} from '@google/model-viewer/lib/three-components/SmoothControls';
 import {ModelViewerElement} from '@google/model-viewer';
 import type {ModelScene} from "@google/model-viewer/lib/three-components/ModelScene";
 import {Hotspot} from "@google/model-viewer/lib/three-components/Hotspot";
 import type {Renderer} from "@google/model-viewer/lib/three-components/Renderer";
 import type {Vector3} from "three";
+import {BufferGeometry, Mesh} from "three";
+import {acceleratedRaycast, computeBoundsTree, disposeBoundsTree} from 'three-mesh-bvh';
+import {setupLighting} from "./lighting.ts";
 
 ModelViewerElement.modelCacheSize = 0; // Also needed to avoid tree shaking
-
-const emit = defineEmits<{ load: [] }>()
+//@ts-ignore
+BufferGeometry.prototype.computeBoundsTree = computeBoundsTree;
+//@ts-ignore
+BufferGeometry.prototype.disposeBoundsTree = disposeBoundsTree;
+//@ts-ignore
+Mesh.prototype.raycast = acceleratedRaycast;
 
 const props = defineProps<{ src: string }>();
 
 const elem = ref<ModelViewerElement | null>(null);
 const scene = ref<ModelScene | null>(null);
 const renderer = ref<Renderer | null>(null);
+const controls = ref<SmoothControls | null>(null);
 
-onMounted(() => {
-  if (!elem.value) return;
-  elem.value.addEventListener('load', async () => {
-    if (!elem.value) return;
-    // Delete the initial load banner
-    let banner = elem.value.querySelector('.initial-load-banner');
-    if (banner) banner.remove();
-    // Set the scene and renderer
+const sett = ref<any | null>(null);
+(async () => sett.value = await settings)();
+
+let lastCameraTargetPosition: Vector3 | undefined = undefined;
+let lastCameraZoom: number | undefined = undefined;
+let lastCameraUrl = props.src.toString();
+let initialized = false
+onUpdated(() => {
+  if (!elem.value) return; // Not ready yet
+  if (initialized) return; // Already initialized
+  initialized = true;
+  elem.value.addEventListener('before-render', () => {
+    if (!elem.value) return
+    // Extract internals of model-viewer in order to hack unsupported features
     scene.value = elem.value[$scene] as ModelScene;
     renderer.value = elem.value[$renderer] as Renderer;
-    // Emit the load event
-    emit('load')
+    controls.value = (elem.value as any)[$controls] as SmoothControls;
+    // Recover the camera position if it was set before
+    if (lastCameraTargetPosition) {
+      // console.log("RESTORING camera position?", lastCameraTargetPosition);
+      scene.value.setTarget(-lastCameraTargetPosition.x, -lastCameraTargetPosition.y, -lastCameraTargetPosition.z);
+      scene.value.jumpToGoal(); // Avoid move animation
+    }
+    (async () => {
+      let tries = 0
+      while (tries++ < 25) {
+        if (!lastCameraZoom || !elem.value?.getCameraOrbit()?.radius) break;
+        let change = lastCameraZoom - elem.value.getCameraOrbit().radius;
+        //console.log("Zooming to", lastCameraZoom, "from", elem.value.getCameraOrbit().radius, "change", change);
+        if (Math.abs(change) < 0.001) break;
+        elem.value.zoom(-Math.sign(change) * (Math.pow(Math.abs(change) + 1, 0.9) - 1)); // Arbitrary, experimental
+        elem.value.jumpCameraToGoal();
+        await elem.value.updateComplete;
+      }
+      //console.log("Ready to save!")
+      lastCameraUrl = props.src.toString();
+    })();
   });
   elem.value.addEventListener('camera-change', onCameraChange);
+  elem.value.addEventListener('progress', (ev) => onProgress((ev as any).detail.totalProgress));
+  setupLighting(elem.value);
 });
 
+function onCameraChange() {
+  // Remember the camera position to keep it in case of scene changes
+  if (scene.value && props.src.toString() == lastCameraUrl) {  // Don't overwrite with initial unwanted positions
+    lastCameraTargetPosition = scene.value.target.position.clone();
+    lastCameraZoom = elem.value?.getCameraOrbit()?.radius;
+    //console.log("Saving camera?", lastCameraTargetPosition, lastCameraZoom);
+  }
+  // Also need to update the SVG overlay
+  for (let lineId in lines.value) {
+    onCameraChangeLine(lineId as any);
+  }
+}
+
+// Handles loading the events for <model-viewer>'s slotted progress bar
+const progressBar = ref<HTMLElement | null>(null);
+const updateBar = ref<HTMLElement | null>(null);
+let onProgressHideTimeout: number | null = null;
+const onProgress = (totalProgress: number) => {
+  if (!progressBar.value || !updateBar.value) return;
+  // Update the progress bar and ensure it's visible
+  progressBar.value.style.display = 'block';
+  progressBar.value.style.opacity = '1'; // Fade in
+  updateBar.value.style.width = `${totalProgress * 100}%`;
+  // Auto-hide smoothly when no progress is made for a while
+  if (onProgressHideTimeout) clearTimeout(onProgressHideTimeout);
+  onProgressHideTimeout = setTimeout(() => {
+    if (!progressBar.value) return;
+    progressBar.value.style.opacity = '0'; // Fade out
+    setTimeout(() => {
+      if (!progressBar.value) return;
+      progressBar.value.style.display = 'none'; // Actually hide
+    }, 300); // 0.3s fade out
+  }, 1000);
+};
+
+const poster = ref<string>("")
+const setPosterText = (newText: string) => {
+  poster.value = "data:image/svg+xml;charset=utf-8;base64," + btoa(
+      '<svg width="800" height="600" xmlns="http://www.w3.org/2000/svg" fill="gray">' +
+      '<text x="50%" y="0%" dominant-baseline="middle" text-anchor="middle" font-size="48px">' +
+      newText +
+      '</text>' +
+      '</svg>')
+}
+setPosterText("Loading...")
+
 class Line3DData {
   startHotspot: HTMLElement = document.body
   endHotspot: HTMLElement = document.body
@@ -76,45 +154,38 @@ function addLine3D(p1: Vector3, p2: Vector3, centerText?: string, lineAttrs: { [
     lineAttrs: lineAttrs
   };
   scene.value.queueRender() // Needed to update the hotspots
-  requestIdleCallback(() => onCameraChangeLine(id));
+  requestIdleCallback(() => onCameraChangeLine(id), {timeout: 100});
   return id;
 }
 
 function removeLine3D(id: number): boolean {
   if (!scene.value || !(id in lines.value)) return false;
   scene.value.removeHotspot(new Hotspot({name: 'line' + id + '_start'}));
-  lines.value[id].startHotspot.parentElement?.remove()
+  lines.value[id]?.startHotspot.parentElement?.remove()
   scene.value.removeHotspot(new Hotspot({name: 'line' + id + '_end'}));
-  lines.value[id].endHotspot.parentElement?.remove()
+  lines.value[id]?.endHotspot.parentElement?.remove()
   delete lines.value[id];
   scene.value.queueRender() // Needed to update the hotspots
   return true;
 }
 
-function onCameraChange() {
-  // Need to update the SVG overlay
-  for (let lineId in lines.value) {
-    onCameraChangeLine(lineId as any);
-  }
-}
-
 let svg = ref<SVGElement | null>(null);
 
 function onCameraChangeLine(lineId: number) {
   if (!(lineId in lines.value) || !(elem.value)) return // Silently ignore (not updated yet)
   // Update start and end 2D positions
   let {x: xB, y: yB} = elem.value.getBoundingClientRect();
-  let {x, y} = lines.value[lineId].startHotspot.getBoundingClientRect();
-  lines.value[lineId].start2D = [x - xB, y - yB];
-  let {x: x2, y: y2} = lines.value[lineId].endHotspot.getBoundingClientRect();
-  lines.value[lineId].end2D = [x2 - xB, y2 - yB];
+  let {x, y} = lines.value[lineId]?.startHotspot.getBoundingClientRect() ?? {x: 0, y: 0};
+  if (lines.value[lineId]) lines.value[lineId].start2D = [x - xB, y - yB];
+  let {x: x2, y: y2} = lines.value[lineId]?.endHotspot.getBoundingClientRect() ?? {x: 0, y: 0};
+  if (lines.value[lineId]) lines.value[lineId].end2D = [x2 - xB, y2 - yB];
 
   // Update the center text size if needed
-  if (svg.value && lines.value[lineId].centerText && lines.value[lineId].centerTextSize[0] === 0) {
+  if (svg.value && lines.value[lineId]?.centerText && lines.value[lineId]?.centerTextSize[0] === 0) {
     let text = svg.value.getElementsByClassName('line' + lineId + '_text')[0] as SVGTextElement | undefined;
     if (text) {
       let bbox = text.getBBox();
-      lines.value[lineId].centerTextSize = [bbox.width, bbox.height];
+      if (lines.value[lineId]) lines.value[lineId].centerTextSize = [bbox.width, bbox.height];
     }
   }
 }
@@ -133,42 +204,47 @@ function entries(lines: { [id: number]: Line3DData }): [string, Line3DData][] {
   return Object.entries(lines);
 }
 
-defineExpose({elem, onElemReady, scene, renderer, addLine3D, removeLine3D});
+defineExpose({elem, onElemReady, scene, renderer, controls, addLine3D, removeLine3D, onProgress, setPosterText});
 
 let {disableTap} = inject<{ disableTap: Ref<boolean> }>('disableTap')!!;
-watch(disableTap, (value) => {
-  // Rerender not auto triggered? This works anyway...
-  if (value) elem.value?.setAttribute('disable-tap', '');
-  else elem.value?.removeAttribute('disable-tap');
+watch(disableTap, (newDisableTap) => {
+  if (elem.value) elem.value.disableTap = newDisableTap;
 });
 </script>
 
 <template>
   <!-- The main 3D model viewer -->
-  <model-viewer ref="elem" style="width: 100%; height: 100%" :src="props.src" alt="The 3D model(s)" camera-controls
-                camera-orbit="30deg 75deg auto" max-camera-orbit="Infinity 180deg auto"
-                min-camera-orbit="-Infinity 0deg 5%" :disable-tap="disableTap" :exposure="settings.exposure"
-                :shadow-intensity="settings.shadowIntensity" interaction-prompt="none" :autoplay="settings.autoplay"
-                :ar="settings.arModes.length > 0" :ar-modes="settings.arModes" :skybox-image="settings.background"
-                :environment-image="settings.background">
-    <slot></slot> <!-- Controls, annotations, etc. -->
-    <loading class="annotation initial-load-banner"></loading>
+  <model-viewer ref="elem" v-if="sett != null" :ar="sett.arModes.length > 0" :ar-modes="sett.arModes"
+                :environment-image="sett.environment" :exposure="sett.exposure" :autoplay="sett.autoplay"
+                :orbit-sensitivity="sett.orbitSensitivity" :pan-sensitivity="sett.panSensitivity"
+                :poster="poster" :shadow-intensity="sett.shadowIntensity" :skybox-image="sett.skybox"
+                :src="props.src" :zoom-sensitivity="sett.zoomSensitivity" alt="The 3D model(s)" camera-controls
+                camera-orbit="45deg 45deg auto" interaction-prompt="none" max-camera-orbit="Infinity 180deg auto"
+                min-camera-orbit="-Infinity 0deg 5%" style="width: 100%; height: 100%">
+    <slot></slot>
+    <!-- Add a progress bar to the top of the model viewer -->
+    <div ref="progressBar" slot="progress-bar" class="progress-bar">
+      <div ref="updateBar" class="update-bar"/>
+    </div>
   </model-viewer>
 
   <!-- The SVG overlay for fake 3D lines attached to the model -->
   <div class="overlay-svg-wrapper">
-    <svg ref="svg" class="overlay-svg" width="100%" height="100%" xmlns="http://www.w3.org/2000/svg">
+    <svg ref="svg" class="overlay-svg" height="100%" width="100%" xmlns="http://www.w3.org/2000/svg">
       <g v-for="[lineId, line] in entries(lines)" :key="lineId">
-        <line :x1="line.start2D[0]" :y1="line.start2D[1]" :x2="line.end2D[0]"
+        <line :x1="line.start2D[0]" :x2="line.end2D[0]" :y1="line.start2D[1]"
               :y2="line.end2D[1]" v-bind="line.lineAttrs"/>
         <g v-if="line.centerText !== undefined">
-          <rect :x="(line.start2D[0] + line.end2D[0]) / 2 - line.centerTextSize[0]/2 - 4"
-                :y="(line.start2D[1] + line.end2D[1]) / 2 - line.centerTextSize[1]/2 - 2"
-                :width="line.centerTextSize[0] + 8" :height="line.centerTextSize[1] + 4"
-                fill="gray" fill-opacity="0.75" rx="4" ry="4" stroke="black" v-if="line.centerText"/>
-          <text :x="(line.start2D[0] + line.end2D[0]) / 2" :y="(line.start2D[1] + line.end2D[1]) / 2"
-                text-anchor="middle" dominant-baseline="middle" font-size="16" fill="black"
-                :class="'line' + lineId + '_text'" v-if="line.centerText">
+          <rect v-if="line.centerText"
+                :height="line.centerTextSize[1] + 4"
+                :width="line.centerTextSize[0] + 8"
+                :x="(line.start2D[0] + line.end2D[0]) / 2 - line.centerTextSize[0]/2 - 4"
+                :y="(line.start2D[1] + line.end2D[1]) / 2 - line.centerTextSize[1]/2 - 2" fill="gray"
+                fill-opacity="0.75" rx="4" ry="4" stroke="black"/>
+          <text v-if="line.centerText" :class="'line' + lineId + '_text'"
+                :x="(line.start2D[0] + line.end2D[0]) / 2" :y="(line.start2D[1] + line.end2D[1]) / 2"
+                dominant-baseline="middle" fill="black"
+                font-size="16" text-anchor="middle">
             {{ line.centerText }}
           </text>
         </g>
@@ -202,4 +278,30 @@ watch(disableTap, (value) => {
   height: 100dvh;
   pointer-events: none;
 }
-</style>
+
+.progress-bar {
+  display: block;
+  pointer-events: none;
+  width: 100%;
+  height: 10%;
+  max-height: 2%;
+  position: absolute;
+  left: 50%;
+  top: 0;
+  transform: translate3d(-50%, 0%, 0);
+  border-radius: 25px;
+  box-shadow: 0 3px 10px 3px rgba(0, 0, 0, 0.5), 0 0 5px 1px rgba(0, 0, 0, 0.6);
+  border: 1px solid rgba(255, 255, 255, 0.9);
+  background-color: rgba(0, 0, 0, 0.5);
+  transition: opacity 0.3s;
+}
+
+.update-bar {
+  background-color: rgba(255, 255, 255, 0.9);
+  width: 0;
+  height: 100%;
+  border-radius: 25px;
+  float: left;
+  transition: width 0.3s;
+}
+</style>

frontend/viewer/lighting.ts

@@ -0,0 +1,96 @@
+import { ModelViewerElement } from "@google/model-viewer";
+import { $scene } from "@google/model-viewer/lib/model-viewer-base";
+import { settings } from "../misc/settings.ts";
+
+export let currentSceneRotation = 0; // radians, 0 is the default rotation
+
+export async function setupLighting(modelViewer: ModelViewerElement) {
+  modelViewer[$scene].environmentIntensity = (await settings).environmentIntensity;
+  // Code is mostly copied from the example at: https://modelviewer.dev/examples/stagingandcameras/#turnSkybox
+  let lastX: number;
+  let panning = false;
+  let radiansPerPixel: number;
+
+  const startPan = () => {
+    const orbit = modelViewer.getCameraOrbit();
+    const { radius } = orbit;
+    radiansPerPixel = (-1 * radius) / modelViewer.getBoundingClientRect().height;
+    modelViewer.interactionPrompt = "none";
+  };
+
+  const updatePan = (thisX: number) => {
+    const delta = (thisX - lastX) * radiansPerPixel;
+    lastX = thisX;
+    currentSceneRotation += delta;
+    const orbit = modelViewer.getCameraOrbit();
+    orbit.theta += delta;
+    modelViewer.cameraOrbit = orbit.toString();
+    modelViewer.resetTurntableRotation(currentSceneRotation);
+    modelViewer.jumpCameraToGoal();
+  };
+
+  modelViewer.addEventListener(
+    "mousedown",
+    (event) => {
+      panning = event.metaKey || event.shiftKey;
+      if (!panning) return;
+
+      lastX = event.clientX;
+      startPan();
+      event.stopPropagation();
+    },
+    true,
+  );
+
+  modelViewer.addEventListener(
+    "touchstart",
+    (event) => {
+      const { targetTouches, touches } = event;
+      panning = targetTouches.length === 2 && targetTouches.length === touches.length;
+      if (!panning) return;
+
+      lastX = 0.5 * ((targetTouches[0]?.clientX ?? 0) + (targetTouches[1]?.clientX ?? 0));
+      startPan();
+    },
+    true,
+  );
+
+  document.addEventListener(
+    "mousemove",
+    (event) => {
+      if (!panning) return;
+
+      updatePan(event.clientX);
+      event.stopPropagation();
+    },
+    true,
+  );
+
+  modelViewer.addEventListener(
+    "touchmove",
+    (event) => {
+      if (!panning || event.targetTouches.length !== 2) return;
+
+      const { targetTouches } = event;
+      const thisX = 0.5 * ((targetTouches[0]?.clientX ?? 0) + (targetTouches[1]?.clientX ?? 0));
+      updatePan(thisX);
+    },
+    true,
+  );
+
+  document.addEventListener(
+    "mouseup",
+    (event) => {
+      panning = false;
+    },
+    true,
+  );
+
+  modelViewer.addEventListener(
+    "touchend",
+    (event) => {
+      panning = false;
+    },
+    true,
+  );
+}

package.json

@@ -1,8 +1,9 @@
 {
   "name": "yet-another-cad-viewer",
-  "version": "0.1.0",
+  "version": "0.10.11",
   "description": "",
   "license": "MIT",
+  "private": true,
   "author": "Yeicor <4929005+Yeicor@users.noreply.github.com>",
   "type": "module",
   "scripts": {
@@ -14,31 +15,41 @@
     "update-licenses": "generate-license-file --input package.json --output assets/licenses.txt --overwrite"
   },
   "dependencies": {
-    "@gltf-transform/core": "^3.10.0",
-    "@gltf-transform/functions": "^3.10.0",
-    "@google/model-viewer": "^3.4.0",
+    "@gltf-transform/core": "^4.1.0",
+    "@gltf-transform/extensions": "^4.1.0",
+    "@gltf-transform/functions": "^4.1.0",
+    "@google/model-viewer": "^4.0.0",
+    "@guolao/vue-monaco-editor": "^1.5.5",
     "@jamescoyle/vue-icon": "^0.1.2",
     "@mdi/js": "^7.4.47",
     "@mdi/svg": "^7.4.47",
-    "three": "^0.160.1",
-    "three-orientation-gizmo": "https://github.com/jrj2211/three-orientation-gizmo",
-    "vue": "^3.4.21",
-    "vuetify": "^3.5.7"
+    "js-base64": "^3.7.7",
+    "monaco-editor": "^0.55.0",
+    "pako": "^2.1.0",
+    "pyodide": "^0.29.0",
+    "tanmayo7lock": "^1.0.18",
+    "three": "^0.181.0",
+    "three-mesh-bvh": "^0.9.0",
+    "three-orientation-gizmo": "git+https://github.com/jrj2211/three-orientation-gizmo.git",
+    "vue": "^3.5.13",
+    "vuetify": "^3.7.4"
   },
   "devDependencies": {
-    "@tsconfig/node20": "^20.1.2",
-    "@types/node": "^20.11.24",
-    "@types/three": "^0.160.0",
-    "@vitejs/plugin-vue": "^5.0.3",
-    "@vitejs/plugin-vue-jsx": "^3.1.0",
-    "@vue/tsconfig": "^0.5.1",
+    "@tsconfig/node20": "^20.1.4",
+    "@types/node": "^24.0.0",
+    "@types/pako": "^2.0.3",
+    "@types/three": "^0.181.0",
+    "@vitejs/plugin-vue": "^6.0.0",
+    "@vitejs/plugin-vue-jsx": "^5.0.0",
+    "@vue/tsconfig": "^0.8.0",
     "buffer": "^5.5.0||^6.0.0",
-    "commander": "^12.0.0",
-    "generate-license-file": "^3.0.1",
-    "npm-run-all2": "^6.1.1",
-    "terser": "^5.28.1",
-    "typescript": "~5.3.0",
-    "vite": "^5.0.11",
-    "vue-tsc": "^2.0.3"
+    "commander": "^14.0.0",
+    "generate-license-file": "^4.0.0",
+    "npm-run-all2": "^8.0.0",
+    "terser": "^5.36.0",
+    "typescript": "^5.9.2",
+    "vite": "^7.0.0",
+    "vite-plugin-static-copy": "^3.1.1",
+    "vue-tsc": "^3.0.0"
   }
 }

pyproject.toml

@@ -1,35 +1,34 @@
+[build-system]
+requires = ["poetry-core==2.1.3", "taskipy==1.14.1"]
+build-backend = "poetry.core.masonry.api"
+
 [tool.poetry]
 name = "yacv-server"
-version = "0.1.0"  # TODO: Update automatically by CI on release (also for package.json!)
+version = "0.10.11"
 description = "Yet Another CAD Viewer (server)"
 authors = ["Yeicor <4929005+Yeicor@users.noreply.github.com>"]
 license = "MIT"
 readme = "README.md"
 include = [
-    { path = 'yacv_server/frontend/*', format = 'wheel' },
-    { path = 'yacv_server/frontend/*', format = 'sdist' },
+    { path = 'yacv_server/frontend/**/*', format = 'wheel' },
+    { path = 'yacv_server/frontend/**/*', format = 'sdist' },
 ]
 
+[tool.taskipy.tasks]
+build = "task build_frontend && task build_backend"
+build_frontend = "rm -rf yacv_server/frontend || true && yarn install && YACV_SMALL_BUILD=true yarn build --outDir yacv_server/frontend"
+build_backend = "poetry build --format wheel"
+
 [tool.poetry.dependencies]
-python = "^3.9"
+python = ">=3.12,<3.13" # Due to vtk transitive dependency of build123d -> cadquery-ocp -> vtk
 
 # CAD
-build123d = "^0.4.0"
-ocp-tessellate = "^2.0.6"
-
-# Web
-aiohttp = "^3.9.3"
-aiohttp-cors = "^0.7.0"
-aiohttp-devtools = "^1.1.2"
+build123d = ">=0.10,<0.11"
 
 # Misc
 pygltflib = "^1.16.2"
-pillow = "^10.2.0"
+pillow = ">=12,<12.1"
+poetry-core = "==2.2.1"
 
-[tool.poetry.build]
-generate-setup-file = false
-script = "build.py"
-
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
+[tool.poetry.group.dev.dependencies]
+taskipy = "^1.14.1"

tsconfig.json

@@ -8,12 +8,11 @@
     "frontend/**/__tests__/*"
   ],
   "compilerOptions": {
-    "composite": true,
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
-
+    "declaration": false,
     "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
     }
   }
-}
+}

vite.config.ts

@@ -1,21 +1,33 @@
 import {fileURLToPath, URL} from 'node:url'
 
 import {defineConfig} from 'vite'
+// @ts-ignore
 import vue from '@vitejs/plugin-vue'
+// @ts-ignore
 import vueJsx from '@vitejs/plugin-vue-jsx'
+import {name, version} from './package.json'
+import {execSync} from 'child_process'
+import {viteStaticCopy} from "vite-plugin-static-copy";
+import {dirname, join} from "path";
+import {version as pyodideVersion} from "pyodide";
+
+let wantsSmallBuild = process.env.YACV_SMALL_BUILD == "true";
 
 // https://vitejs.dev/config/
 export default defineConfig({
+    base: "",
     plugins: [
         vue({
             template: {
                 compilerOptions: {
-                    isCustomElement: tag => tag == 'model-viewer'
+                    isCustomElement: (tag: string) => tag == 'model-viewer'
                 }
             }
         }),
         vueJsx(),
+        viteStaticCopyPyodide(),
     ],
+    optimizeDeps: {exclude: ["pyodide"]},
     resolve: {
         alias: {
             // @ts-ignore
@@ -23,7 +35,53 @@ export default defineConfig({
         }
     },
     build: {
-        assetsDir: '.',
+        assetsDir: '.', // Support deploying to a subdirectory using relative URLs
         cssCodeSplit: false, // Small enough to inline
+        chunkSizeWarningLimit: 1024, // KB. Three.js is big. Draco is even bigger but not likely to be used.
+        sourcemap: true, // For debugging production
+        rollupOptions: {
+            output: {
+                experimentalMinChunkSize: 512000, // 512KB (avoid too many small chunks)
+            },
+            external: wantsSmallBuild ? [
+                // Exclude some large optional dependencies if small build is requested (for embedding in python package)
+                "pyodide",
+                /.*\/pyodide-worker.*/,
+                "monaco-editor",
+                /monaco-editor\/.*/,
+                "@guolao/vue-monaco-editor",
+                /three\/examples\/jsm\/libs\/draco\/draco_(en|de)coder\.js/,
+            ] : [],
+        },
+    },
+    worker: {
+        format: 'es', // Use ES modules for workers (IIFE is not supported with code-splitting)
+    },
+    define: {
+        __APP_NAME__: JSON.stringify(name),
+        __APP_VERSION__: JSON.stringify(version),
+        __APP_GIT_SHA__: JSON.stringify(execSync('git rev-parse HEAD').toString().trim()),
+        __APP_GIT_DIRTY__: JSON.stringify(execSync('git diff --quiet || echo dirty').toString().trim()),
+        __YACV_SMALL_BUILD__: JSON.stringify(wantsSmallBuild)
     }
 })
+
+
+function viteStaticCopyPyodide() {
+    const PYODIDE_EXCLUDE = [
+        "!**/*.{md,html}",
+        "!**/*.d.ts",
+        "!**/*.whl",
+        "!**/node_modules",
+    ];
+    // @ts-ignore
+    const pyodideDir = dirname(fileURLToPath(import.meta.resolve("pyodide")));
+    return viteStaticCopy({
+        targets: wantsSmallBuild ? [] : [
+            {
+                src: [join(pyodideDir, "*")].concat(PYODIDE_EXCLUDE),
+                dest: "pyodide-v" + pyodideVersion, // It would be better to use hashed names instead of folder...
+            },
+        ],
+    });
+}

yacv_server/__init__.py

@@ -1,42 +1,21 @@
-import logging
 import os
-import time
 
-from aiohttp import web
-from build123d import Vector
+from yacv_server.cad import image_to_gltf
+from yacv_server.yacv import YACV
 
-from server import Server
-
-server = Server()
+yacv = YACV()
 """The server instance. This is the main entry point to serve CAD objects and other data to the frontend."""
 
 if 'YACV_DISABLE_SERVER' not in os.environ:
     # Start a new server ASAP to let the polling client connect while still building CAD objects
     # This is a bit of a hack, but it is seamless to the user. This behavior can be disabled by setting
     # the environment variable YACV_DISABLE_SERVER to a non-empty value
-    server.start()
+    yacv.start()
 
 # Expose some nice aliases using the default server instance
-show = server.show
-show_object = show
-show_image = server.show_image
-show_all = server.show_cad_all
-
-
-def _get_app() -> web.Application:
-    """Required by aiohttp-devtools"""
-    logging.basicConfig(level=logging.DEBUG)
-    from logo import build_logo, ASSETS_DIR
-    logo, img_location, img_path = build_logo()
-    server.show_cad(logo, 'logo')
-    server.show_cad(img_location, 'location')
-    server.show_image(img_path, img_location, 20)
-    server.show_gltf(open(os.path.join(ASSETS_DIR, 'fox.glb'), 'rb').read(), 'fox')
-    return server.app
-
-
-if __name__ == '__main__':
-    # Publish the logo to the server (reusing code from the aiohttp-devtools)
-    _get_app()
-    # Keep the server running for testing
-    time.sleep(60)
+show = yacv.show
+show_all = yacv.show_cad_all
+image_to_gltf = image_to_gltf
+export_all = yacv.export_all
+remove = yacv.remove
+clear = yacv.clear

yacv_server/cad.py

@@ -2,17 +2,41 @@
 Utilities to work with CAD objects
 """
 import hashlib
-from typing import Optional, Union, List, Tuple
+import io
+import re
+from typing import Optional, Union, Tuple
 
+from OCP.TopExp import TopExp
 from OCP.TopLoc import TopLoc_Location
+from OCP.TopTools import TopTools_IndexedMapOfShape
 from OCP.TopoDS import TopoDS_Shape
+from build123d import Compound, Color
 
-from gltf import GLTFMgr
+from yacv_server.gltf import GLTFMgr
 
-CADLike = Union[TopoDS_Shape, TopLoc_Location]  # Faces, Edges, Vertices and Locations for now
+CADCoreLike = Union[TopoDS_Shape, TopLoc_Location]  # Faces, Edges, Vertices and Locations for now
+CADLike = Union[CADCoreLike, any]  # build123d and cadquery types
+ColorTuple = Tuple[float, float, float, float]
 
 
-def get_shape(obj: any, error: bool = True) -> Optional[CADLike]:
+def get_color(obj: any) -> Optional[ColorTuple]:
+    """Get color from a CAD Object or any other color-like object"""
+    if 'color' in dir(obj):
+        obj = obj.color
+    if isinstance(obj, tuple):
+        c = None
+        if len(obj) == 3:
+            c = obj + (1,)
+        elif len(obj) == 4:
+            c = obj
+        # noinspection PyTypeChecker
+        return [min(max(float(x), 0), 1) for x in c]
+    if isinstance(obj, Color):
+        return obj.to_tuple()
+    return None
+
+
+def get_shape(obj: CADLike, error: bool = True) -> Optional[CADCoreLike]:
     """ Get the shape of a CAD-like object """
 
     # Try to grab a shape if a different type of object was passed
@@ -39,28 +63,50 @@ def get_shape(obj: any, error: bool = True) -> Optional[CADLike]:
     if isinstance(obj, TopoDS_Shape):
         return obj
 
+    # Handle iterables like Build123d ShapeList by extracting all sub-shapes and making a compound
+    if isinstance(obj, list) or isinstance(obj, tuple) or isinstance(obj, set) or isinstance(obj, dict):
+        try:
+            if isinstance(obj, dict):
+                obj_iter = iter(obj.values())
+            else:
+                obj_iter = iter(obj)
+            # print(obj, ' -> ', obj_iter)
+            shapes_raw = [get_shape(sub_obj, error=False) for sub_obj in obj_iter]
+            # Silently drop non-shapes
+            shapes_raw_filtered = [shape for shape in shapes_raw if shape is not None]
+            if len(shapes_raw_filtered) > 0:  # Continue if we found at least one shape
+                # Sorting is required to improve hashcode consistency
+                shapes_raw_filtered_sorted = sorted(shapes_raw_filtered, key=lambda x: _hashcode(x))
+                # Build a single compound shape (skip locations/axes here, they can't be in a Compound)
+                shapes_bd = [Compound(shape) for shape in shapes_raw_filtered_sorted if
+                             shape is not None and not isinstance(shape, TopLoc_Location)]
+                return get_shape(Compound(shapes_bd), error)
+        except TypeError:
+            pass
+
     if error:
         raise ValueError(f'Cannot show object of type {type(obj)} (submit issue?)')
     else:
         return None
 
 
-def grab_all_cad() -> List[Tuple[str, CADLike]]:
+def grab_all_cad() -> set[Tuple[str, CADCoreLike]]:
     """ Grab all shapes by inspecting the stack """
     import inspect
     stack = inspect.stack()
-    shapes = []
+    shapes = set()
     for frame in stack:
         for key, value in frame.frame.f_locals.items():
             shape = get_shape(value, error=False)
-            if shape:
-                shapes.append((key, shape))
+            if shape and shape not in shapes:
+                shapes.add((key, shape))
     return shapes
 
 
-def image_to_gltf(source: str | bytes, center: any, ppmm: int, name: Optional[str] = None,
-                  save_mime: str = 'image/jpeg') -> Tuple[bytes, str]:
-    """Convert an image to a GLTF CAD object, indicating the center location and pixels per millimeter."""
+def image_to_gltf(source: str | bytes, center: any, width: Optional[float] = None, height: Optional[float] = None,
+                  name: Optional[str] = None, save_mime: str = 'image/jpeg', power_of_two: bool = True) \
+        -> Tuple[bytes, str]:
+    """Convert an image to a GLTF CAD object."""
     from PIL import Image
     import io
     import os
@@ -71,16 +117,16 @@ def image_to_gltf(source: str | bytes, center: any, ppmm: int, name: Optional[st
     # Handle arguments
     if name is None:
         if isinstance(source, str):
-            name = os.path.basename(source)
+            name, _ = os.path.splitext(os.path.basename(source))
         else:
             hasher = hashlib.md5()
             hasher.update(source)
             name = 'image_' + hasher.hexdigest()
-    format: str
+    _format: str
     if save_mime == 'image/jpeg':
-        format = 'JPEG'
+        _format = 'JPEG'
     elif save_mime == 'image/png':
-        format = 'PNG'
+        _format = 'PNG'
     else:
         raise ValueError(f'Unsupported save MIME type (for GLTF files): {save_mime}')
 
@@ -89,28 +135,41 @@ def image_to_gltf(source: str | bytes, center: any, ppmm: int, name: Optional[st
     if not isinstance(center_loc, TopLoc_Location):
         raise ValueError('Center location not valid')
     plane = Plane(Location(center_loc))
-    # Convert coordinates system
-    plane.origin = Vector(plane.origin.X, plane.origin.Z, -plane.origin.Y)
-    plane.z_dir = -plane.y_dir
-    plane.y_dir = plane.z_dir
-
-    def vert(v: Vector) -> Tuple[float, float, float]:
-        return v.X, v.Y, v.Z
 
     # Load the image to a byte buffer
     img = Image.open(source)
     img_buf = io.BytesIO()
-    img.save(img_buf, format=format)
+
+    # Use the original dimensions for scaling the model
+    if width is None and height is None:
+        raise ValueError('At least one of width or height must be specified')  # Fallback to pixels == mm?
+    elif width is None:
+        width = img.width / img.height * height
+    elif height is None:
+        height = height or img.height / img.width * width  # Apply default aspect ratio if unspecified
+
+    # Resize the image to a power of two if requested (recommended for GLTF)
+    if power_of_two:
+        new_width = 2 ** (img.width - 1).bit_length()
+        new_height = 2 ** (img.height - 1).bit_length()
+        img = img.resize((new_width, new_height))
+
+    # Save the image to a buffer
+    img.save(img_buf, format=_format)
     img_buf = img_buf.getvalue()
 
+    # Convert coordinates system as a last step (gltf is Y-up instead of Z-up)
+    def vert(v: Vector) -> Vector:
+        return Vector(v.X, v.Z, -v.Y)
+
     # Build the gltf
     mgr = GLTFMgr(image=(img_buf, save_mime))
     mgr.add_face([
-        vert(plane.origin - plane.x_dir * img.width / (2 * ppmm) - plane.y_dir * img.height / (2 * ppmm)),
-        vert(plane.origin + plane.x_dir * img.width / (2 * ppmm) - plane.y_dir * img.height / (2 * ppmm)),
-        vert(plane.origin + plane.x_dir * img.width / (2 * ppmm) + plane.y_dir * img.height / (2 * ppmm)),
-        vert(plane.origin - plane.x_dir * img.width / (2 * ppmm) + plane.y_dir * img.height / (2 * ppmm)),
-    ], [
+        vert(plane.origin - plane.x_dir * width / 2 + plane.y_dir * height / 2),
+        vert(plane.origin + plane.x_dir * width / 2 + plane.y_dir * height / 2),
+        vert(plane.origin + plane.x_dir * width / 2 - plane.y_dir * height / 2),
+        vert(plane.origin - plane.x_dir * width / 2 - plane.y_dir * height / 2),
+    ], [vert(plane.z_dir)] * 4, [
         (0, 2, 1),
         (0, 3, 2),
     ], [
@@ -118,7 +177,36 @@ def image_to_gltf(source: str | bytes, center: any, ppmm: int, name: Optional[st
         (1, 0),
         (1, 1),
         (0, 1),
-    ])
+    ], (1, 1, 1, 1))
 
     # Return the GLTF binary blob and the suggested name of the image
-    return b''.join(mgr.gltf.save_to_bytes()), name
+    return b''.join(mgr.build().save_to_bytes()), name
+
+
+def _hashcode(obj: Union[bytes, CADCoreLike], **extras) -> str:
+    """Utility to compute the STABLE hash code of a shape"""
+    # NOTE: obj.HashCode(MAX_HASH_CODE) is not stable across different runs of the same program
+    # This is best-effort and not guaranteed to be unique
+    hasher = hashlib.md5(usedforsecurity=False)
+    for k, v in extras.items():
+        hasher.update(str(k).encode())
+        hasher.update(str(v).encode())
+    if isinstance(obj, bytes):
+        hasher.update(obj)
+    elif isinstance(obj, TopLoc_Location):
+        sub_data = io.BytesIO()
+        obj.DumpJson(sub_data)
+        hasher.update(sub_data.getvalue())
+    elif isinstance(obj, TopoDS_Shape):
+        map_of_shapes = TopTools_IndexedMapOfShape()
+        TopExp.MapShapes_s(obj, map_of_shapes)
+        for i in range(1, map_of_shapes.Extent() + 1):
+            sub_shape = map_of_shapes.FindKey(i)
+            sub_data = io.BytesIO()
+            TopoDS_Shape.DumpJson(sub_shape, sub_data)
+            val = sub_data.getvalue()
+            val = re.sub(b'"this": "[^"]*"', b'', val)  # Remove memory address
+            hasher.update(val)
+    else:
+        raise ValueError(f'Cannot hash object of type {type(obj)}')
+    return hasher.hexdigest()

yacv_server/gltf.py

@@ -4,51 +4,107 @@ import numpy as np
 from build123d import Location, Plane, Vector
 from pygltflib import *
 
-_checkerboard_image_bytes = base64.decodebytes(
-    b'iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAF0lEQVQI12N49OjR////Gf'
-    b'/////48WMATwULS8tcyj8AAAAASUVORK5CYII=')
+
+def get_version() -> str:
+    try:
+        return importlib.metadata.version("yacv_server")
+    except importlib.metadata.PackageNotFoundError:
+        return "unknown"
 
 
 class GLTFMgr:
     """A utility class to build our GLTF2 objects easily and incrementally"""
 
-    def __init__(self, image: Tuple[bytes, str] = (_checkerboard_image_bytes, 'image/png')):
+    gltf: GLTF2
+
+    # Intermediate data to be filled by the add_* methods and merged into the GLTF object
+    # - Face data
+    face_indices: List[int]  # 3 indices per triangle
+    face_positions: List[float]  # x, y, z
+    face_normals: List[float]  # x, y, z
+    face_tex_coords: List[float]  # u, v
+    face_colors: List[float]  # r, g, b, a
+    image: Optional[Tuple[bytes, str]]  # image/png
+    # - Edge data
+    edge_indices: List[int]  # 2 indices per edge
+    edge_positions: List[float]  # x, y, z
+    edge_colors: List[float]  # r, g, b, a
+    # - Vertex data
+    vertex_indices: List[int]  # 1 index per vertex
+    vertex_positions: List[float]  # x, y, z
+    vertex_colors: List[float]  # r, g, b, a
+
+    def __init__(self, image: Optional[Tuple[bytes, str]] = None):
         self.gltf = GLTF2(
-            asset=Asset(generator=f"yacv_server@{importlib.metadata.version('yacv_server')}"),
+            asset=Asset(generator=f"yacv_server@{get_version()}"),
             scene=0,
             scenes=[Scene(nodes=[0])],
-            nodes=[Node(mesh=0)],
-            meshes=[Mesh(primitives=[])],
-            accessors=[],
-            bufferViews=[BufferView(buffer=0, byteLength=len(image[0]), byteOffset=0)],
-            buffers=[Buffer(byteLength=len(image[0]))],
-            samplers=[Sampler(magFilter=NEAREST)],
-            textures=[Texture(source=0, sampler=0)],
-            images=[Image(bufferView=0, mimeType=image[1])],
+            nodes=[Node(mesh=0)],  # TODO: Server-side detection of shallow copies --> nodes
+            meshes=[Mesh(primitives=[
+                Primitive(indices=-1, attributes=Attributes(), mode=TRIANGLES, material=0,
+                          extras={"face_triangles_end": []}),
+                Primitive(indices=-1, attributes=Attributes(), mode=LINES, material=0,
+                          extras={"edge_points_end": []}),
+                Primitive(indices=-1, attributes=Attributes(), mode=POINTS, material=0),
+            ])],
+            materials=[Material(pbrMetallicRoughness=PbrMetallicRoughness(metallicFactor=0.1, roughnessFactor=1.0),
+                                alphaCutoff=None)],
         )
-        self.gltf.set_binary_blob(image[0])
+        self.face_indices = []
+        self.face_positions = []
+        self.face_normals = []
+        self.face_tex_coords = []
+        self.face_colors = []
+        self.image = image
+        self.edge_indices = []
+        self.edge_positions = []
+        self.edge_colors = []
+        self.vertex_indices = []
+        self.vertex_positions = []
+        self.vertex_colors = []
 
-    def add_face(self, vertices_raw: List[Tuple[float, float, float]], indices_raw: List[Tuple[int, int, int]],
-                 tex_coord_raw: List[Tuple[float, float]]):
-        """Add a face to the GLTF as a new primitive of the unique mesh"""
-        vertices = np.array([[v[0], v[1], v[2]] for v in vertices_raw], dtype=np.float32)
-        indices = np.array([[i[0], i[1], i[2]] for i in indices_raw], dtype=np.uint32)
-        tex_coord = np.array([[t[0], t[1]] for t in tex_coord_raw], dtype=np.float32)
-        self._add_any(vertices, indices, tex_coord, mode=TRIANGLES, material="face")
+    @property
+    def _faces_primitive(self) -> Primitive:
+        return [p for p in self.gltf.meshes[0].primitives if p.mode == TRIANGLES][0]
 
-    def add_edge(self, vertices_raw: List[Tuple[float, float, float]], mat: str = None):
-        """Add an edge to the GLTF as a new primitive of the unique mesh"""
-        vertices = np.array([[v[0], v[1], v[2]] for v in vertices_raw], dtype=np.float32)
-        indices = np.array(list(map(lambda i: [i, i + 1], range(len(vertices) - 1))), dtype=np.uint32)
-        tex_coord = np.array([])
-        self._add_any(vertices, indices, tex_coord, mode=LINE_STRIP, material=mat or "edge")
+    @property
+    def _edges_primitive(self) -> Primitive:
+        return [p for p in self.gltf.meshes[0].primitives if p.mode == LINES][0]
 
-    def add_vertex(self, vertex: Tuple[float, float, float]):
-        """Add a vertex to the GLTF as a new primitive of the unique mesh"""
-        vertices = np.array([[vertex[0], vertex[1], vertex[2]]])
-        indices = np.array([[0]], dtype=np.uint32)
-        tex_coord = np.array([], dtype=np.float32)
-        self._add_any(vertices, indices, tex_coord, mode=POINTS, material="vertex")
+    @property
+    def _vertices_primitive(self) -> Primitive:
+        return [p for p in self.gltf.meshes[0].primitives if p.mode == POINTS][0]
+
+    def add_face(self, vertices_raw: List[Vector], normals: List[Vector], indices_raw: List[Tuple[int, int, int]],
+                 tex_coord_raw: List[Tuple[float, float]], color: Tuple[float, float, float, float]):
+        """Add a face to the GLTF mesh"""
+        # assert len(vertices_raw) == len(tex_coord_raw), f"Vertices and texture coordinates have different lengths"
+        # assert min([i for t in indices_raw for i in t]) == 0, f"Face indices start at {min(indices_raw)}"
+        # assert max([e for t in indices_raw for e in t]) < len(vertices_raw), f"Indices have non-existing vertices"
+        base_index = len(self.face_positions) // 3  # All the new indices reference the new vertices
+        self.face_indices.extend([base_index + i for t in indices_raw for i in t])
+        self.face_positions.extend([v for t in vertices_raw for v in t])
+        self.face_normals.extend([n for t in normals for n in t])
+        self.face_tex_coords.extend([c for t in tex_coord_raw for c in t])
+        self.face_colors.extend([col for _ in range(len(vertices_raw)) for col in color])
+        self._faces_primitive.extras["face_triangles_end"].append(len(self.face_indices))
+
+    def add_edge(self, vertices_raw: List[Tuple[Tuple[float, float, float], Tuple[float, float, float]]],
+                 color: Tuple[float, float, float, float]):
+        """Add an edge to the GLTF mesh"""
+        vertices_flat = [v for t in vertices_raw for v in t]  # Line from 0 to 1, 2 to 3, 4 to 5, etc.
+        base_index = len(self.edge_positions) // 3
+        self.edge_indices.extend([base_index + i for i in range(len(vertices_flat))])
+        self.edge_positions.extend([v for t in vertices_flat for v in t])
+        self.edge_colors.extend([col for _ in range(len(vertices_flat)) for col in color])
+        self._edges_primitive.extras["edge_points_end"].append(len(self.edge_indices))
+
+    def add_vertex(self, vertex: Tuple[float, float, float], color: Tuple[float, float, float, float]):
+        """Add a vertex to the GLTF mesh"""
+        base_index = len(self.vertex_positions) // 3
+        self.vertex_indices.append(base_index)
+        self.vertex_positions.extend(vertex)
+        self.vertex_colors.extend(color)
 
     def add_location(self, loc: Location):
         """Add a location to the GLTF as a new primitive of the unique mesh"""
@@ -58,120 +114,96 @@ class GLTFMgr:
             return v.X, v.Y, v.Z
 
         # Add 1 origin vertex and 3 edges with custom colors to identify the X, Y and Z axis
-        self.add_vertex(vert(pl.origin))
-        self.add_edge([vert(pl.origin), vert(pl.origin + pl.x_dir)], mat="locX")
-        self.add_edge([vert(pl.origin), vert(pl.origin + pl.y_dir)], mat="locY")
-        self.add_edge([vert(pl.origin), vert(pl.origin + pl.z_dir)], mat="locZ")
+        # The colors are hardcoded. You can add vertices and edges manually to change them.
+        self.add_vertex(vert(pl.origin), color=(0.1, 0.1, 0.1, 1.0))
+        self.add_edge([(vert(pl.origin), vert(pl.origin + pl.x_dir))], color=(0.97, 0.24, 0.24, 1.0))
+        self.add_edge([(vert(pl.origin), vert(pl.origin + pl.y_dir))], color=(0.42, 0.8, 0.15, 1.0))
+        self.add_edge([(vert(pl.origin), vert(pl.origin + pl.z_dir))], color=(0.09, 0.55, 0.94, 1.0))
 
-    def add_material(self, kind: str) -> int:
-        """It is important to use a different material for each primitive to be able to change them at runtime"""
-        new_material: Material
-        if kind == "face":
-            new_material = Material(name="face", alphaCutoff=None, pbrMetallicRoughness=PbrMetallicRoughness(
-                baseColorTexture=TextureInfo(index=0), baseColorFactor=[1, 1, 0.5, 1]), doubleSided=True)
-        elif kind == "edge":
-            new_material = Material(name="edge", alphaCutoff=None, pbrMetallicRoughness=PbrMetallicRoughness(
-                baseColorFactor=[0, 0, 0.5, 1]))
-        elif kind == "vertex":
-            new_material = Material(name="vertex", alphaCutoff=None, pbrMetallicRoughness=PbrMetallicRoughness(
-                baseColorFactor=[0, 0.3, 0.3, 1]))
-        elif kind == "locX":
-            new_material = Material(name="locX", alphaCutoff=None, pbrMetallicRoughness=PbrMetallicRoughness(
-                baseColorFactor=[0.97, 0.24, 0.24, 1]))
-        elif kind == "locY":
-            new_material = Material(name="locY", alphaCutoff=None, pbrMetallicRoughness=PbrMetallicRoughness(
-                baseColorFactor=[0.42, 0.8, 0.15, 1]))
-        elif kind == "locZ":
-            new_material = Material(name="locZ", alphaCutoff=None, pbrMetallicRoughness=PbrMetallicRoughness(
-                baseColorFactor=[0.09, 0.55, 0.94, 1]))
+    def build(self) -> GLTF2:
+        """Merge the intermediate data into the GLTF object and return it"""
+        buffers_list: List[Tuple[Accessor, BufferView, bytes]] = []
+
+        if len(self.face_indices) > 0:
+            self._faces_primitive.indices = len(buffers_list)
+            buffers_list.append(_gen_buffer_metadata(self.face_indices, 1))
+            self._faces_primitive.attributes.POSITION = len(buffers_list)
+            buffers_list.append(_gen_buffer_metadata(self.face_positions, 3))
+            self._faces_primitive.attributes.NORMAL = len(buffers_list)
+            buffers_list.append(_gen_buffer_metadata(self.face_normals, 3))
+            self._faces_primitive.attributes.TEXCOORD_0 = len(buffers_list)
+            buffers_list.append(_gen_buffer_metadata(self.face_tex_coords, 2))
+            self._faces_primitive.attributes.COLOR_0 = len(buffers_list)
+            buffers_list.append(_gen_buffer_metadata(self.face_colors, 4))
         else:
-            raise ValueError(f"Unknown material kind {kind}")
-        self.gltf.materials.append(new_material)
-        return len(self.gltf.materials) - 1
+            self.image = None  # Unused image
+            self.gltf.meshes[0].primitives = list(  # Remove unused faces primitive
+                filter(lambda p: p.mode != TRIANGLES, self.gltf.meshes[0].primitives))
 
-    def _add_any(self, vertices: np.ndarray, indices: np.ndarray, tex_coord: np.ndarray, mode: int = TRIANGLES,
-                 material: str = "face"):
-        assert vertices.ndim == 2
-        assert vertices.shape[1] == 3
-        vertices = vertices.astype(np.float32)
-        vertices_blob = vertices.tobytes()
+        edges_and_vertices_mat = 0
+        if self.image is not None and (len(self.edge_indices) > 0 or len(self.vertex_indices) > 0):
+            # Create a material without texture for edges and vertices
+            edges_and_vertices_mat = len(self.gltf.materials)
+            new_mat = copy.deepcopy(self.gltf.materials[0])
+            new_mat.pbrMetallicRoughness.baseColorTexture = None
+            self.gltf.materials.append(new_mat)
 
-        assert indices.ndim == 2
-        assert indices.shape[1] == 3 and mode == TRIANGLES or indices.shape[1] == 2 and mode == LINE_STRIP or \
-               indices.shape[1] == 1 and mode == POINTS
-        indices = indices.astype(np.uint32)
-        indices_blob = indices.flatten().tobytes()
+        # Treat edges and vertices the same way
+        for (indices, positions, colors, primitive, kind) in [
+            (self.edge_indices, self.edge_positions, self.edge_colors, self._edges_primitive, LINES),
+            (self.vertex_indices, self.vertex_positions, self.vertex_colors, self._vertices_primitive, POINTS)
+        ]:
+            if len(indices) > 0:
+                primitive.material = edges_and_vertices_mat
+                primitive.indices = len(buffers_list)
+                buffers_list.append(_gen_buffer_metadata(indices, 1))
+                primitive.attributes.POSITION = len(buffers_list)
+                buffers_list.append(_gen_buffer_metadata(positions, 3))
+                primitive.attributes.COLOR_0 = len(buffers_list)
+                buffers_list.append(_gen_buffer_metadata(colors, 4))
+            else:
+                self.gltf.meshes[0].primitives = list(  # Remove unused edges primitive
+                    filter(lambda p: p.mode != kind, self.gltf.meshes[0].primitives))
 
-        # Check that all vertices are referenced by the indices
-        assert indices.max() == len(vertices) - 1, f"{indices.max()} != {len(vertices) - 1}"
-        assert indices.min() == 0
-        assert np.unique(indices.flatten()).size == len(vertices)
+        if self.image is not None:  # Add texture last as it creates a fake accessor that is not added!
+            self.gltf.images = [Image(bufferView=len(buffers_list), mimeType=self.image[1])]
+            self.gltf.textures = [Texture(source=0, sampler=0)]
+            self.gltf.samplers = [Sampler(magFilter=NEAREST)]
+            # noinspection PyPep8Naming
+            self.gltf.materials[0].pbrMetallicRoughness.baseColorTexture = TextureInfo(index=0)
+            buffers_list.append((Accessor(), BufferView(), self.image[0]))
 
-        assert len(tex_coord) == 0 or tex_coord.ndim == 2
-        assert len(tex_coord) == 0 or tex_coord.shape[1] == 2
-        tex_coord = tex_coord.astype(np.float32)
-        tex_coord_blob = tex_coord.tobytes()
-
-        accessor_base = len(self.gltf.accessors)
-        self.gltf.meshes[0].primitives.append(
-            Primitive(
-                attributes=Attributes(POSITION=accessor_base + 1, TEXCOORD_0=accessor_base + 2)
-                if len(tex_coord) > 0 else Attributes(POSITION=accessor_base + 1),
-                indices=accessor_base,
-                mode=mode,
-                material=self.add_material(material),
-            )
-        )
-
-        buffer_view_base = len(self.gltf.bufferViews)
-        self.gltf.accessors.extend([it for it in [
-            Accessor(
-                bufferView=buffer_view_base,
-                componentType=UNSIGNED_INT,
-                count=indices.size,
-                type=SCALAR,
-                max=[int(indices.max())],
-                min=[int(indices.min())],
-            ),
-            Accessor(
-                bufferView=buffer_view_base + 1,
-                componentType=FLOAT,
-                count=len(vertices),
-                type=VEC3,
-                max=vertices.max(axis=0).tolist(),
-                min=vertices.min(axis=0).tolist(),
-            ),
-            Accessor(
-                bufferView=buffer_view_base + 2,
-                componentType=FLOAT,
-                count=len(tex_coord),
-                type=VEC2,
-                max=tex_coord.max(axis=0).tolist(),
-                min=tex_coord.min(axis=0).tolist(),
-            ) if len(tex_coord) > 0 else None
-        ] if it is not None])
-
-        prev_binary_blob = self.gltf.binary_blob()
+        # Once all the data is ready, we can concatenate the buffers updating the accessors and views
+        prev_binary_blob = self.gltf.binary_blob() or b''
         byte_offset_base = len(prev_binary_blob)
-        self.gltf.bufferViews.extend([bv for bv in [
-            BufferView(
-                buffer=0,
-                byteOffset=byte_offset_base,
-                byteLength=len(indices_blob),
-                target=ELEMENT_ARRAY_BUFFER,
-            ),
-            BufferView(
-                buffer=0,
-                byteOffset=byte_offset_base + len(indices_blob),
-                byteLength=len(vertices_blob),
-                target=ARRAY_BUFFER,
-            ),
-            BufferView(
-                buffer=0,
-                byteOffset=byte_offset_base + len(indices_blob) + len(vertices_blob),
-                byteLength=len(tex_coord_blob),
-                target=ARRAY_BUFFER,
-            )
-        ] if bv.byteLength > 0])
+        for accessor, bufferView, blob in buffers_list:
 
-        self.gltf.set_binary_blob(prev_binary_blob + indices_blob + vertices_blob + tex_coord_blob)
+            if accessor.componentType is not None:  # Remove accessor of texture
+                buffer_view_base = len(self.gltf.bufferViews)
+                accessor.bufferView = buffer_view_base
+                self.gltf.accessors.append(accessor)
+
+            bufferView.buffer = 0
+            bufferView.byteOffset = byte_offset_base
+            bufferView.byteLength = len(blob)
+            self.gltf.bufferViews.append(bufferView)
+
+            byte_offset_base += len(blob)
+            prev_binary_blob += blob
+
+        self.gltf.buffers.append(Buffer(byteLength=byte_offset_base))
+        self.gltf.set_binary_blob(prev_binary_blob)
+
+        return self.gltf
+
+
+def _gen_buffer_metadata(data: List[any], chunk: int) -> Tuple[Accessor, BufferView, bytes]:
+    return Accessor(
+        componentType={1: UNSIGNED_INT, 2: FLOAT, 3: FLOAT, 4: FLOAT}[chunk],
+        count=len(data) // chunk,
+        type={1: SCALAR, 2: VEC2, 3: VEC3, 4: VEC4}[chunk],
+        max=[max(data[i::chunk]) for i in range(chunk)],
+        min=[min(data[i::chunk]) for i in range(chunk)],
+    ), BufferView(
+        target={1: ELEMENT_ARRAY_BUFFER, 2: ARRAY_BUFFER, 3: ARRAY_BUFFER, 4: ARRAY_BUFFER}[chunk],
+    ), np.array(data, dtype={1: np.uint32, 2: np.float32, 3: np.float32, 4: np.float32}[chunk]).tobytes()

yacv_server/logo.py

@@ -1,58 +1,72 @@
-import asyncio
-import logging
 import os
-from typing import Tuple
+from typing import Union, Dict
 
 from build123d import *
 
 ASSETS_DIR = os.getenv('ASSETS_DIR', os.path.join(os.path.dirname(__file__), '..', 'assets'))
 
 
-def build_logo(text: bool = True) -> Tuple[Part, Location, str]:
+def build_logo(text: bool = True) -> Dict[str, Union[Compound, Location, str]]:
     """Builds the CAD part of the logo"""
     with BuildPart(Plane.XY.offset(50)) as logo_obj:
         Box(22, 40, 30)
         fillet(edges().filter_by(Axis.Y).group_by(Axis.Z)[-1], 10)
         offset(solid(), 2, openings=faces().group_by(Axis.Z)[0] + faces().filter_by(Plane.XZ))
         if text:
-            text_at_plane = Plane.YZ
-            text_at_plane.origin = faces().group_by(Axis.X)[-1].face().center()
-            with BuildSketch(text_at_plane.location):
-                Text('Yet Another\nCAD Viewer', 7, font_path='/usr/share/fonts/TTF/OpenSans-Regular.ttf')
+            with BuildSketch(Plane.YZ.move(Pos(faces().group_by(Axis.X)[-1].face().center()))):
+                Text('Yet Another\nCAD Viewer', 6, font_path='/usr/share/fonts/TTF/Hack-Regular.ttf')
             extrude(amount=1)
+        logo_face_curved_front = faces().filter_by(GeomType.CYLINDER).group_by(Axis.X)[-1].face()
 
-    logo_img_location = logo_obj.faces().group_by(Axis.X)[0].face().center_location  # Avoid overlapping:
-    logo_img_location.position = Vector(logo_img_location.position.X - 4e-2, logo_img_location.position.Y,
-                                        logo_img_location.position.Z)
+    # Highlight text edges with a custom color
+    to_highlight = logo_obj.edges().group_by(Axis.X)[-1]
+    logo_obj_hl = Compound(to_highlight).translate((1e-3, 0, 0))  # To avoid z-fighting
+    logo_obj_hl.color = (0, 0.3, 0.3, 1)
+
+    # Highlight face with custom texture
+    logo_face_curved_front.yacv_texture = \
+        'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAF0lEQVQI12N49OjR////Gf' \
+        '/////48WMATwULS8tcyj8AAAAASUVORK5CYII='
+    logo_face_curved_front.color = (0, 0.5, 0.0, 1)
+    logo_obj = Compound(logo_obj.faces() - ShapeList([logo_face_curved_front]))  # Remove face from the main object
+
+    # Add a logo image to the CAD part
+    logo_img_location = logo_obj.faces().group_by(Axis.X)[0].face().center_location
+    logo_img_location *= Location((0, 0, 4e-2), (0, 0, 90))  # Avoid overlapping and adjust placement
     logo_img_path = os.path.join(ASSETS_DIR, 'img.jpg')
-    return logo_obj.part, logo_img_location, logo_img_path
+    img_glb_bytes, img_name = image_to_gltf(logo_img_path, logo_img_location, height=18)
+
+    # Add an animated fox to the CAD part
+    fox_glb_bytes = open(os.path.join(ASSETS_DIR, 'fox.glb'), 'rb').read()
+
+    return {'fox': fox_glb_bytes, 'logo': logo_obj, 'logo_hl': logo_obj_hl, 'logo_hl_tex': logo_face_curved_front,
+            'location': logo_img_location, img_name: img_glb_bytes}
 
 
 if __name__ == "__main__":
+    import logging
+
     logging.basicConfig(level=logging.DEBUG)
 
-    # Start an offline server to export the CAD part of the logo in a way compatible with the frontend
-    # If this is not set, the server will auto-start on import and show_* calls will provide live updates
-    os.environ['YACV_DISABLE_SERVER'] = '1'
-    from yacv_server import show, show_image
+    testing_server = os.getenv('TESTING_SERVER') is not None
+
+    if not testing_server:
+        # Start an offline server to export the CAD part of the logo in a way compatible with the frontend
+        # If this is not set, the server will auto-start on import and show_* calls will provide live updates
+        os.environ['YACV_DISABLE_SERVER'] = 'True'
+
+    from yacv_server import export_all, show, image_to_gltf
+
+    # Build the CAD part of the logo
+    logo = build_logo()
 
     # Add the CAD part of the logo to the server
-    logo, img_location, img_path = build_logo()
-    show(logo, 'base')
-    show(img_location, 'location')
-    show_image(img_path, img_location, 20)
+    show(*[obj for obj in logo.values()], names=[name for name in logo.keys()])
 
-
-    async def exporter():
-        # We need access to the actual server object for advanced features like exporting to file
-        from yacv_server import server
-        for name in server.shown_object_names():
-            print(f'Exporting {name} to GLB...')
-            with open(os.path.join(ASSETS_DIR, 'logo_build', f'{name}.glb'), 'wb') as f:
-                f.write(await server.export(name))
-
-
-    # Save the complete logo to multiple GLB files (async required)
-    asyncio.run(exporter())
-
-    print('Logo saved!')
+    if testing_server:
+        # remove('location')  # Test removing a part
+        pass
+    else:
+        # Save the complete logo to multiple GLB files
+        export_all(os.path.join(ASSETS_DIR, 'logo_build'))
+        print('Logo saved!')

yacv_server/main.py

@@ -1,6 +0,0 @@
-from os import system
-
-if __name__ == '__main__':
-    # Just a reminder that a hot-reloading server can be started with the following command:
-    # Need to disable auto-start to avoid conflicts with the hot-reloading server
-    system('YACV_DISABLE_SERVER=true aiohttp-devtools runserver __init__.py --port 32323 --app-factory _get_app')

yacv_server/myhttp.py

@@ -0,0 +1,141 @@
+import io
+import os
+import urllib.parse
+from http import HTTPStatus, HTTPMethod
+from http.server import SimpleHTTPRequestHandler
+
+from yacv_server.mylogger import logger
+
+# Find the frontend folder (optional, but recommended)
+FILE_DIR = os.path.dirname(__file__)
+FRONTEND_BASE_PATH = os.getenv('FRONTEND_BASE_PATH', os.path.join(FILE_DIR, 'frontend'))
+if not os.path.exists(FRONTEND_BASE_PATH):
+    if os.path.exists(os.path.join(FILE_DIR, '..', 'dist')):  # Fallback to dev build
+        FRONTEND_BASE_PATH = os.path.join(FILE_DIR, '..', 'dist')
+    else:
+        logger.warning('Frontend not found at %s', FRONTEND_BASE_PATH)
+        FRONTEND_BASE_PATH = None
+
+# Define the API paths (also available at the root path for simplicity)
+UPDATES_API_PATH = '/api/updates'
+OBJECTS_API_PATH = '/api/object'  # /{name}
+
+
+class HTTPHandler(SimpleHTTPRequestHandler):
+    yacv: 'yacv.YACV'
+
+    def __init__(self, *args, yacv: 'yacv.YACV', **kwargs):
+        self.yacv = yacv
+        super().__init__(*args, **kwargs, directory=FRONTEND_BASE_PATH)
+
+    def log_message(self, fmt, *args):
+        logger.debug(fmt, *args)
+
+    def end_headers(self):
+        # Add CORS headers to the response
+        self.send_header('Access-Control-Allow-Origin', '*')
+        self.send_header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
+        super().end_headers()
+
+    def translate_path(self, path: str) -> str:
+        """Translate a path to the local filesystem, adds some basic security checks"""
+        path = super().translate_path(path)
+        path = os.path.realpath(path)  # Avoid symlink hacks
+        if self.directory:  # Ensure proper subdirectory
+            base = os.path.realpath(self.directory)
+            if not path.startswith(base):
+                self.send_error(HTTPStatus.FORBIDDEN, "Path is not in the frontend directory")
+                return ''
+        return path
+
+    def send_head(self):
+        path_parts = self.path.split('?', 1)
+        if len(path_parts) == 1:
+            path_parts.append('')
+        [path, query_str] = path_parts
+        query = urllib.parse.parse_qs(query_str)
+        if path == UPDATES_API_PATH or path == '/' and query.get('api_updates') is not None:
+            return self._api_updates()
+        elif path.startswith(OBJECTS_API_PATH) or path == '/' and query.get('api_object') is not None:
+            if path.startswith(OBJECTS_API_PATH):
+                obj_name = self.path[len(OBJECTS_API_PATH) + 1:]
+            else:
+                obj_name = query.get('api_object').pop()
+            return self._api_object(obj_name)
+        elif path.endswith('/'):  # Frontend index.html
+            self.path += 'index.html'
+            return super().send_head()
+        else:  # Normal frontend file
+            return super().send_head()
+
+    def _api_updates(self):
+        """Handles a publish-only websocket connection that send show_object events along with their hashes and URLs"""
+
+        self.send_response(HTTPStatus.OK)
+        self.send_header("Content-Type", "text/event-stream")
+        self.send_header("Cache-Control", "no-cache")
+        if not self.requestline.startswith(HTTPMethod.HEAD):
+            # Chunked transfer encoding!
+            self.send_header("Transfer-Encoding", "chunked")
+        else:
+            self.send_header("Content-Length", "0")
+        self.end_headers()
+
+        if self.requestline.startswith(HTTPMethod.HEAD):
+            return
+
+        # Keep a shared read lock to know if any frontend is still working before shutting down
+        with self.yacv.frontend_lock.r_locked():
+
+            # Avoid accepting new connections while shutting down
+            if self.yacv.shutting_down.is_set() and self.yacv.at_least_one_client.is_set():
+                self.send_error(HTTPStatus.SERVICE_UNAVAILABLE, 'Server is shutting down')
+                return
+            self.yacv.at_least_one_client.set()
+            logger.debug('Updates client connected')
+
+            def write_chunk(_chunk_data: str):
+                self.wfile.write(hex(len(_chunk_data))[2:].encode('utf-8'))
+                self.wfile.write(b'\r\n')
+                self.wfile.write(_chunk_data.encode('utf-8'))
+                self.wfile.write(b'\r\n')
+                self.wfile.flush()
+
+            write_chunk('retry: 100\n\n')
+
+            subscription = self.yacv.show_events.subscribe(yield_timeout=1.0)  # Keep-alive interval
+            try:
+                for data in subscription:
+                    if data is None:
+                        write_chunk(':keep-alive\n\n')
+                    else:
+                        logger.debug('Sending info about %s: %s', data.name, data)
+                        # noinspection PyUnresolvedReferences
+                        to_send = data.to_json()
+                        write_chunk(f'data: {to_send}\n\n')
+            except (BrokenPipeError, ConnectionResetError):  # Client disconnected normally
+                pass
+            finally:
+                subscription.close()
+
+        logger.debug('Updates client disconnected')
+
+    def _api_object(self, obj_name: str):
+        """Returns the object file with the matching name, building it if necessary."""
+        # Export the object (or fail if not found)
+        _export = self.yacv.export(obj_name)
+        if _export is None:
+            self.send_error(HTTPStatus.NOT_FOUND, f'Object {obj_name} not found')
+            return io.BytesIO()
+
+        exported_glb, _hash = _export
+
+        # Wrap the GLB in a response and return it
+        self.send_response(HTTPStatus.OK)
+        self.send_header('Content-Type', 'model/gltf-binary')
+        self.send_header('Content-Length', str(len(exported_glb)))
+        self.send_header('Content-Disposition', f'attachment; filename="{obj_name}.glb"')
+        self.send_header('E-Tag', f'"{_hash}"')
+        self.end_headers()
+        self.wfile.write(exported_glb)
+        return None

yacv_server/plugin.py

@@ -1 +1 @@
-# TODO: Plugins that can freely modify the GLTF file as it is being built
+# TODO(if there is interest): Plugins that can freely modify the GLTF file as it is being built

yacv_server/pubsub.py

@@ -1,64 +1,87 @@
-import asyncio
-from typing import List, TypeVar, \
-    Generic, AsyncGenerator
+import queue
+import threading
+from typing import List, TypeVar, Generic, Generator
 
-from mylogger import logger
+from yacv_server.mylogger import logger
 
 T = TypeVar('T')
 
+_end_of_queue = object()
+
 
 class BufferedPubSub(Generic[T]):
-    """A simple implementation of publish-subscribe pattern using asyncio and buffering all previous events"""
+    """A simple implementation of publish-subscribe pattern using threading and buffering all previous events"""
 
     _buffer: List[T]
-    _subscribers: List[asyncio.Queue[T]]
-    _lock = asyncio.Lock()
-    max_buffer_size = 1000
+    _buffer_lock: threading.Lock
+    _subscribers: List[queue.Queue[T]]
+    _subscribers_lock: threading.Lock
+    max_buffer_size: int
 
-    def __init__(self):
+    def __init__(self, max_buffer_size: int = 100):
         self._buffer = []
+        self._buffer_lock = threading.Lock()
         self._subscribers = []
+        self._subscribers_lock = threading.Lock()
+        self.max_buffer_size = max_buffer_size
 
-    def publish_nowait(self, event: T):
+    def publish(self, event: T):
         """Publishes an event without blocking (synchronous API does not require locking)"""
-        self._buffer.append(event)
-        if len(self._buffer) > self.max_buffer_size:
-            self._buffer.pop(0)
-        for q in self._subscribers:
-            q.put_nowait(event)
+        with self._buffer_lock:
+            self._buffer.append(event)
+            if len(self._buffer) > self.max_buffer_size:
+                self._buffer.pop(0)
+            for q in self._subscribers:
+                q.put(event)
 
-    async def _subscribe(self, include_buffered: bool = True, include_future: bool = True) -> asyncio.Queue[T]:
+    def _subscribe(self, include_buffered: bool = True, include_future: bool = True) -> queue.Queue[T]:
         """Subscribes to events"""
-        q = asyncio.Queue()
-        async with self._lock:
+        q = queue.Queue()
+        with self._subscribers_lock:
             self._subscribers.append(q)
         logger.debug(f"Subscribed to %s (%d subscribers)", self, len(self._subscribers))
         if include_buffered:
-            for event in self._buffer:
-                await q.put(event)
+            with self._buffer_lock:
+                for event in self._buffer:
+                    q.put(event)
             if not include_future:
-                await q.put(None)
+                q.put(_end_of_queue)
         return q
 
-    async def _unsubscribe(self, q: asyncio.Queue[T]):
+    def _unsubscribe(self, q: queue.Queue[T]):
         """Unsubscribes from events"""
-        async with self._lock:
+        with self._subscribers_lock:
             self._subscribers.remove(q)
         logger.debug(f"Unsubscribed from %s (%d subscribers)", self, len(self._subscribers))
 
-    async def subscribe(self, include_buffered: bool = True, include_future: bool = True) -> AsyncGenerator[T, None]:
-        """Subscribes to events as an async generator that yields events and automatically unsubscribes"""
-        q = await self._subscribe(include_buffered, include_future)
+    def subscribe(self, include_buffered: bool = True, include_future: bool = True,
+                  yield_timeout: float | None = 0.0) -> Generator[T, None, None]:
+        """Subscribes to events as a generator that yields events and automatically unsubscribes"""
+        q = self._subscribe(include_buffered, include_future)
         try:
             while True:
-                v = await q.get()
+                try:
+                    v = q.get(timeout=yield_timeout)
+                except queue.Empty:
+                    v = None
                 # include_future is incompatible with None values as they are used to signal the end of the stream
-                if v is None and not include_future:
+                if v is _end_of_queue:
                     break
                 yield v
         finally:  # When aclose() is called
-            await self._unsubscribe(q)
+            self._unsubscribe(q)
 
     def buffer(self) -> List[T]:
         """Returns a shallow copy of the list of buffered events"""
-        return self._buffer[:]
+        with self._buffer_lock:
+            return self._buffer[:]
+
+    def delete(self, event: T):
+        """Deletes an event from the buffer"""
+        with self._buffer_lock:
+            self._buffer.remove(event)
+
+    def clear(self):
+        """Clears the buffer"""
+        with self._buffer_lock:
+            self._buffer.clear()

yacv_server/rwlock.py

@@ -0,0 +1,96 @@
+# -*- coding: utf-8 -*-
+""" rwlock.py
+
+    A class to implement read-write locks on top of the standard threading
+    library.
+
+    This is implemented with two mutexes (threading.Lock instances) as per this
+    wikipedia pseudocode:
+
+    https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock#Using_two_mutexes
+
+    Code written by Tyler Neylon at Unbox Research.
+
+    This file is public domain.
+"""
+
+# _______________________________________________________________________
+# Imports
+
+from contextlib import contextmanager
+from threading import Lock
+
+
+# _______________________________________________________________________
+# Class
+
+class RWLock(object):
+    """ RWLock class; this is meant to allow an object to be read from by
+        multiple threads, but only written to by a single thread at a time. See:
+        https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock
+
+        Usage:
+
+            from rwlock import RWLock
+
+            my_obj_rwlock = RWLock()
+
+            # When reading from my_obj:
+            with my_obj_rwlock.r_locked():
+                do_read_only_things_with(my_obj)
+
+            # When writing to my_obj:
+            with my_obj_rwlock.w_locked():
+                mutate(my_obj)
+    """
+
+    def __init__(self):
+
+        self.w_lock = Lock()
+        self.num_r_lock = Lock()
+        self.num_r = 0
+
+    # ___________________________________________________________________
+    # Reading methods.
+
+    def r_acquire(self, *args, **kwargs):
+        self.num_r_lock.acquire(*args, **kwargs)
+        self.num_r += 1
+        if self.num_r == 1:
+            self.w_lock.acquire(*args, **kwargs)
+        self.num_r_lock.release()
+
+    def r_release(self, *args, **kwargs):
+        assert self.num_r > 0
+        self.num_r_lock.acquire(*args, **kwargs)
+        self.num_r -= 1
+        if self.num_r == 0:
+            self.w_lock.release()
+        self.num_r_lock.release()
+
+    @contextmanager
+    def r_locked(self, *args, **kwargs):
+        """ This method is designed to be used via the `with` statement. """
+        try:
+            self.r_acquire(*args, **kwargs)
+            yield
+        finally:
+            self.r_release()
+
+    # ___________________________________________________________________
+    # Writing methods.
+
+    def w_acquire(self, *args, **kwargs):
+        self.w_lock.acquire(*args, **kwargs)
+
+    def w_release(self):
+        self.w_lock.release()
+
+    @contextmanager
+    def w_locked(self, *args, **kwargs):
+        """ This method is designed to be used via the `with` statement. """
+        try:
+            self.w_acquire(*args, **kwargs)
+            yield
+        finally:
+            self.w_release()

yacv_server/server.py

@@ -1,306 +0,0 @@
-import asyncio
-import atexit
-import os
-import signal
-import sys
-import time
-from dataclasses import dataclass
-from threading import Thread
-from typing import Optional, Dict, Union
-
-import aiohttp_cors
-from OCP.TopLoc import TopLoc_Location
-from OCP.TopoDS import TopoDS_Shape
-from aiohttp import web
-from build123d import Shape, Axis, Location, Vector
-from dataclasses_json import dataclass_json
-
-from cad import get_shape, grab_all_cad, image_to_gltf
-from mylogger import logger
-from pubsub import BufferedPubSub
-from tessellate import _hashcode, tessellate
-
-# Find the frontend folder (optional, but recommended)
-FILE_DIR = os.path.dirname(__file__)
-FRONTEND_BASE_PATH = os.getenv('FRONTEND_BASE_PATH', os.path.join(FILE_DIR, 'frontend'))
-if not os.path.exists(FRONTEND_BASE_PATH):
-    if os.path.exists(os.path.join(FILE_DIR, '..', 'dist')):  # Fallback to dev build
-        FRONTEND_BASE_PATH = os.path.join(FILE_DIR, '..', 'dist')
-    else:
-        logger.warning('Frontend not found at %s', FRONTEND_BASE_PATH)
-
-# Define the API paths (also available at the root path for simplicity)
-UPDATES_API_PATH = '/api/updates'
-OBJECTS_API_PATH = '/api/object'  # /{name}
-
-
-@dataclass_json
-@dataclass
-class UpdatesApiData:
-    """Data sent to the client through the updates API"""
-    name: str
-    """Name of the object. Should be unique unless you want to overwrite the previous object"""
-    hash: str
-    """Hash of the object, to detect changes without rebuilding the object"""
-
-
-class UpdatesApiFullData(UpdatesApiData):
-    obj: Optional[TopoDS_Shape]
-    """The OCCT object, if any (not serialized)"""
-    kwargs: Optional[Dict[str, any]]
-    """The show_object options, if any (not serialized)"""
-
-    def __init__(self, name: str, hash: str, obj: Optional[TopoDS_Shape] = None,
-                 kwargs: Optional[Dict[str, any]] = None):
-        self.name = name
-        self.hash = hash
-        self.obj = obj
-        self.kwargs = kwargs
-
-    def to_json(self) -> str:
-        return super().to_json()
-
-
-# noinspection PyUnusedLocal
-async def _index_handler(request: web.Request) -> web.Response:
-    return web.HTTPTemporaryRedirect(location='index.html')
-
-
-class Server:
-    app = web.Application()
-    runner: web.AppRunner
-    thread: Optional[Thread] = None
-    do_shutdown = asyncio.Event()
-    show_events = BufferedPubSub[UpdatesApiFullData]()
-    object_events: Dict[str, BufferedPubSub[bytes]] = {}
-    object_events_lock = asyncio.Lock()
-
-    def __init__(self, *args, **kwargs):
-        # --- Routes ---
-        # - APIs
-        self.app.router.add_route('GET', f'{UPDATES_API_PATH}', self._api_updates)
-        self.app.router.add_route('GET', f'{OBJECTS_API_PATH}/{{name}}', self._api_object)
-        # - Single websocket/objects/frontend entrypoint to ease client configuration
-        self.app.router.add_get('/', self._entrypoint)
-        # - Static files from the frontend
-        self.app.router.add_get('/{path:(.*/|)}', _index_handler)  # Any folder -> index.html
-        self.app.router.add_static('/', path=FRONTEND_BASE_PATH, name='static_frontend')
-        # --- CORS ---
-        cors = aiohttp_cors.setup(self.app, defaults={
-            "*": aiohttp_cors.ResourceOptions(
-                allow_credentials=True,
-                expose_headers="*",
-                allow_headers="*",
-            )
-        })
-        for route in list(self.app.router.routes()):
-            cors.add(route)
-        # --- Misc ---
-        self.loop = asyncio.new_event_loop()
-
-    def start(self):
-        """Starts the web server in the background"""
-        assert self.thread is None, "Server currently running, cannot start another one"
-        # Start the server in a separate daemon thread
-        self.thread = Thread(target=self._run_server, name='yacv_server', daemon=True)
-        signal.signal(signal.SIGINT | signal.SIGTERM, self.stop)
-        atexit.register(self.stop)
-        self.thread.start()
-
-    # noinspection PyUnusedLocal
-    def stop(self, *args):
-        """Stops the web server"""
-        if self.thread is None:
-            print('Cannot stop server because it is not running')
-            return
-        # FIXME: Wait for at least one client to confirm ready before stopping in case we are too fast?
-        self.loop.call_soon_threadsafe(lambda *a: self.do_shutdown.set())
-        self.thread.join(timeout=12)
-        self.thread = None
-        if len(args) >= 1 and args[0] in (signal.SIGINT, signal.SIGTERM):
-            sys.exit(0)  # Exit with success
-
-    def _run_server(self):
-        """Runs the web server"""
-        asyncio.set_event_loop(self.loop)
-        self.loop.run_until_complete(self._run_server_async())
-        self.loop.stop()
-        self.loop.close()
-
-    async def _run_server_async(self):
-        """Runs the web server (async)"""
-        runner = web.AppRunner(self.app)
-        await runner.setup()
-        site = web.TCPSite(runner, os.getenv('YACV_HOST', 'localhost'), int(os.getenv('YACV_PORT', 32323)))
-        await site.start()
-        # print(f'Server started at {site.name}')
-        # Wait for a signal to stop the server while running
-        await self.do_shutdown.wait()
-        # print('Shutting down server...')
-        await runner.cleanup()
-
-    async def _entrypoint(self, request: web.Request) -> web.StreamResponse:
-        """Main entrypoint to the server, which automatically serves the frontend/updates/objects"""
-        if request.headers.get('Upgrade', '').lower() == 'websocket':  # WebSocket -> updates API
-            return await self._api_updates(request)
-        elif request.query.get('api_object', '') != '':  # ?api_object={name} -> object API
-            request.match_info['name'] = request.query['api_object']
-            return await self._api_object(request)
-        else:  # Anything else -> frontend index.html
-            return await _index_handler(request)
-
-    async def _api_updates(self, request: web.Request) -> web.WebSocketResponse:
-        """Handles a publish-only websocket connection that send show_object events along with their hashes and URLs"""
-        ws = web.WebSocketResponse()
-        await ws.prepare(request)
-
-        async def _send_api_updates():
-            subscription = self.show_events.subscribe()
-            try:
-                async for data in subscription:
-                    logger.debug('Sending info about %s to %s: %s', data.name, request.remote, data)
-                    # noinspection PyUnresolvedReferences
-                    await ws.send_str(data.to_json())
-            finally:
-                await subscription.aclose()
-
-        # Start sending updates to the client automatically
-        send_task = asyncio.create_task(_send_api_updates())
-        receive_task = asyncio.create_task(ws.receive())
-        try:
-            logger.debug('Client connected: %s', request.remote)
-            # Wait for the client to close the connection (or send a message)
-            done, pending = await asyncio.wait([send_task, receive_task], return_when=asyncio.FIRST_COMPLETED)
-            # Make sure to stop sending updates to the client and close the connection
-            for task in pending:
-                task.cancel()
-        finally:
-            await ws.close()
-            logger.debug('Client disconnected: %s', request.remote)
-
-        return ws
-
-    obj_counter = 0
-
-    def _show_common(self, name: Optional[str], hash: str, start: float, obj: Optional[TopoDS_Shape] = None,
-                     kwargs=None):
-        name = name or f'object_{self.obj_counter}'
-        self.obj_counter += 1
-        precomputed_info = UpdatesApiFullData(name=name, hash=hash, obj=obj, kwargs=kwargs or {})
-        self.show_events.publish_nowait(precomputed_info)
-        logger.info('show_object(%s, %s) took %.3f seconds', name, hash, time.time() - start)
-        return precomputed_info
-
-    def show(self, any_object: Union[bytes, TopoDS_Shape, any], name: Optional[str] = None, **kwargs):
-        """Publishes "any" object to the server"""
-        if isinstance(any_object, bytes):
-            self.show_gltf(any_object, name, **kwargs)
-        else:
-            self.show_cad(any_object, name, **kwargs)
-
-    def show_gltf(self, gltf: bytes, name: Optional[str] = None, **kwargs):
-        """Publishes any single-file GLTF object to the server."""
-        start = time.time()
-        # Precompute the info and send it to the client as if it was a CAD object
-        precomputed_info = self._show_common(name, _hashcode(gltf, **kwargs), start, kwargs=kwargs)
-        # Also pre-populate the GLTF data for the object API
-        publish_to = BufferedPubSub[bytes]()
-        publish_to.publish_nowait(gltf)
-        publish_to.publish_nowait(b'')  # Signal the end of the stream
-        self.object_events[precomputed_info.name] = publish_to
-
-    def show_image(self, source: str | bytes, center: any, ppmm: int, name: Optional[str] = None,
-                   save_mime: str = 'image/jpeg', **kwargs):
-        """Publishes an image as a quad GLTF object, indicating the center location and pixels per millimeter."""
-        # Convert the image to a GLTF CAD object
-        gltf, name = image_to_gltf(source, center, ppmm, name, save_mime)
-        # Publish it like any other GLTF object
-        self.show_gltf(gltf, name, **kwargs)
-
-    def show_cad(self, obj: Union[TopoDS_Shape, any], name: Optional[str] = None, **kwargs):
-        """Publishes a CAD object to the server"""
-        start = time.time()
-
-        # Get the shape of a CAD-like object
-        obj = get_shape(obj)
-
-        # Convert Z-up (OCCT convention) to Y-up (GLTF convention)
-        if isinstance(obj, TopoDS_Shape):
-            obj = Shape(obj).rotate(Axis.X, -90).wrapped
-        elif isinstance(obj, TopLoc_Location):
-            tmp_location = Location(obj)
-            tmp_location.position = Vector(tmp_location.position.X, tmp_location.position.Z, -tmp_location.position.Y)
-            tmp_location.orientation = Vector(tmp_location.orientation.X - 90, tmp_location.orientation.Y,
-                                              tmp_location.orientation.Z)
-            obj = tmp_location.wrapped
-
-        self._show_common(name, _hashcode(obj, **kwargs), start, obj, kwargs)
-
-    def show_cad_all(self, **kwargs):
-        """Publishes all CAD objects to the server"""
-        for name, obj in grab_all_cad():
-            self.show_cad(obj, name, **kwargs)
-
-    async def _api_object(self, request: web.Request) -> web.Response:
-        """Returns the object file with the matching name, building it if necessary."""
-        # Export the object (or fail if not found)
-        exported_glb = await self.export(request.match_info['name'])
-
-        # Wrap the GLB in a response and return it
-        response = web.Response(body=exported_glb)
-        response.content_type = 'model/gltf-binary'
-        response.headers['Content-Disposition'] = f'attachment; filename="{request.match_info["name"]}.glb"'
-        return response
-
-    def shown_object_names(self) -> list[str]:
-        """Returns the names of all objects that have been shown"""
-        return list([obj.name for obj in self.show_events.buffer()])
-
-    async def export(self, name: str) -> bytes:
-        """Export the given previously-shown object to a single GLB file, building it if necessary."""
-        start = time.time()
-
-        # Check that the object to build exists and grab it if it does
-        found = False
-        obj: Optional[TopoDS_Shape] = None
-        kwargs: Optional[Dict[str, any]] = None
-        subscription = self.show_events.buffer()
-        for data in subscription:
-            if data.name == name:
-                obj = data.obj
-                kwargs = data.kwargs
-                found = True  # Required because obj could be None
-                break
-        if not found:
-            raise web.HTTPNotFound(text=f'No object named {name} was previously shown')
-
-        # Use the lock to ensure that we don't build the object twice
-        async with self.object_events_lock:
-            # If there are no object events for this name, we need to build the object
-            if name not in self.object_events:
-                # Prepare the pubsub for the object
-                publish_to = BufferedPubSub[bytes]()
-                self.object_events[name] = publish_to
-
-                def _build_object():
-                    # Build and publish the object (once)
-                    gltf = tessellate(obj, tolerance=kwargs.get('tolerance', 0.1),
-                                      angular_tolerance=kwargs.get('angular_tolerance', 0.1),
-                                      faces=kwargs.get('faces', True),
-                                      edges=kwargs.get('edges', True),
-                                      vertices=kwargs.get('vertices', True))
-                    glb_list_of_bytes = gltf.save_to_bytes()
-                    publish_to.publish_nowait(b''.join(glb_list_of_bytes))
-                    logger.info('export(%s) took %.3f seconds, %d parts', name, time.time() - start,
-                                len(gltf.meshes[0].primitives))
-
-                # We should build it fully even if we are cancelled, so we use a separate task
-                # Furthermore, building is CPU-bound, so we use the default executor
-                await asyncio.get_running_loop().run_in_executor(None, _build_object)
-
-        # In either case return the elements of a subscription to the async generator
-        subscription = self.object_events[name].subscribe()
-        try:
-            return await anext(subscription)
-        finally:
-            await subscription.aclose()

yacv_server/tessellate.py

@@ -1,76 +1,91 @@
-import hashlib
-import io
-import re
-from typing import List, Dict, Tuple, Union
+from typing import List, Dict, Tuple, Optional
 
 from OCP.BRep import BRep_Tool
 from OCP.BRepAdaptor import BRepAdaptor_Curve
 from OCP.GCPnts import GCPnts_TangentialDeflection
-from OCP.TopExp import TopExp
+from OCP.BRepLib import BRepLib_ToolTriangulatedShape
+from OCP.TopAbs import TopAbs_Orientation
 from OCP.TopLoc import TopLoc_Location
-from OCP.TopTools import TopTools_IndexedMapOfShape
 from OCP.TopoDS import TopoDS_Face, TopoDS_Edge, TopoDS_Shape, TopoDS_Vertex
-from build123d import Shape, Vertex, Face, Location
+from build123d import Vertex, Face, Location, Compound, Vector
 from pygltflib import GLTF2
 
-import mylogger
-from cad import CADLike
-from gltf import GLTFMgr
+from yacv_server.cad import CADCoreLike, ColorTuple
+from yacv_server.gltf import GLTFMgr
+from yacv_server.mylogger import logger
 
 
 def tessellate(
-        cad_like: CADLike,
-        tolerance: float = 0.1,
-        angular_tolerance: float = 0.1,
-        faces: bool = True,
-        edges: bool = True,
-        vertices: bool = True,
+        cad_like: CADCoreLike, color_faces: ColorTuple, color_edges: ColorTuple, color_vertices: ColorTuple,
+        color_obj: Optional[ColorTuple] = None, tolerance: float = 0.1, angular_tolerance: float = 0.1,
+        faces: bool = True, edges: bool = True, vertices: bool = True, texture: Optional[Tuple[bytes, str]] = None,
 ) -> GLTF2:
     """Tessellate a whole shape into a list of triangle vertices and a list of triangle indices."""
-    mgr = GLTFMgr()
+    if texture is None:
+        mgr = GLTFMgr()
+    else:
+        mgr = GLTFMgr(texture)
 
     if isinstance(cad_like, TopLoc_Location):
         mgr.add_location(Location(cad_like))
 
     elif isinstance(cad_like, TopoDS_Shape):
-        shape = Shape(cad_like)
+        shape = Compound(cad_like)
 
         # Perform tessellation tasks
-        edge_to_faces: Dict[TopoDS_Edge, List[TopoDS_Face]] = {}
-        vertex_to_faces: Dict[TopoDS_Vertex, List[TopoDS_Face]] = {}
-        if faces:
-            for face in shape.faces():
-                _tessellate_face(mgr, face.wrapped, tolerance, angular_tolerance)
+        edge_to_faces: Dict[str, List[TopoDS_Face]] = {}
+        vertex_to_faces: Dict[str, List[TopoDS_Face]] = {}
+        if faces and hasattr(shape, 'faces'):
+            shape_faces = shape.faces()
+            for face in shape_faces:
+                _tessellate_face(mgr, face.wrapped, color_obj or color_faces, tolerance, angular_tolerance)
                 if edges:
                     for edge in face.edges():
                         edge_to_faces[edge.wrapped] = edge_to_faces.get(edge.wrapped, []) + [face.wrapped]
                 if vertices:
                     for vertex in face.vertices():
                         vertex_to_faces[vertex.wrapped] = vertex_to_faces.get(vertex.wrapped, []) + [face.wrapped]
-        if edges:
-            for edge in shape.edges():
-                _tessellate_edge(mgr, edge.wrapped, edge_to_faces.get(edge.wrapped, []), angular_tolerance,
-                                 angular_tolerance)
-        if vertices:
+            if len(shape_faces) > 0: color_obj = None  # Don't color edges/vertices if faces are colored
+        if edges and hasattr(shape, 'edges'):
+            shape_edges = shape.edges()
+            for edge in shape_edges:
+                _tessellate_edge(mgr, edge.wrapped, edge_to_faces.get(edge.wrapped, []), color_obj or color_edges,
+                                 angular_tolerance, angular_tolerance)
+            if len(shape_edges) > 0: color_obj = None  # Don't color vertices if edges are colored
+        if vertices and hasattr(shape, 'vertices'):
             for vertex in shape.vertices():
-                _tessellate_vertex(mgr, vertex.wrapped, vertex_to_faces.get(vertex.wrapped, []))
+                _tessellate_vertex(mgr, vertex.wrapped, vertex_to_faces.get(vertex.wrapped, []),
+                                   color_obj or color_vertices)
 
-    return mgr.gltf
+    else:
+        raise TypeError(f"Unsupported type: {type(cad_like)}: {cad_like}")
+
+    return mgr.build()
 
 
 def _tessellate_face(
         mgr: GLTFMgr,
         ocp_face: TopoDS_Face,
+        color: ColorTuple,
         tolerance: float = 1e-3,
-        angular_tolerance: float = 0.1
+        angular_tolerance: float = 0.1,
 ):
-    face = Shape(ocp_face)
-    face.mesh(tolerance, angular_tolerance)
+    face = Compound(ocp_face)
+    # face.mesh(tolerance, angular_tolerance)
+    tri_mesh = face.tessellate(tolerance, angular_tolerance)
+    # noinspection PyArgumentList
     poly = BRep_Tool.Triangulation_s(face.wrapped, TopLoc_Location())
     if poly is None:
-        mylogger.logger.warn("No triangulation found for face")
+        logger.warn("No triangulation found for face")
         return GLTF2()
-    tri_mesh = face.tessellate(tolerance, angular_tolerance)
+
+    # Get the normal for each vertex (for smooth instead of flat shading!)
+    BRepLib_ToolTriangulatedShape.ComputeNormals_s(face.wrapped, poly)
+    reversed_face = face.wrapped.Orientation() == TopAbs_Orientation.TopAbs_REVERSED
+    normals = [
+        -Vector(v) if reversed_face else Vector(v)
+        for v in (poly.Normal(i) for i in range(1, poly.NbNodes() + 1))
+    ]
 
     # Get UV of each face from the parameters
     uv = [
@@ -78,9 +93,10 @@ def _tessellate_face(
         for v in (poly.UVNode(i) for i in range(1, poly.NbNodes() + 1))
     ]
 
-    vertices = [(v.X, v.Y, v.Z) for v in tri_mesh[0]]
+    vertices = tri_mesh[0]
     indices = tri_mesh[1]
-    mgr.add_face(vertices, indices, uv)
+    mgr.add_face(vertices, normals, indices, uv, color)
+    return None
 
 
 def _push_point(v: Tuple[float, float, float], faces: List[TopoDS_Face]) -> Tuple[float, float, float]:
@@ -91,9 +107,9 @@ def _push_point(v: Tuple[float, float, float], faces: List[TopoDS_Face]) -> Tupl
         push_dir = (push_dir[0] + normal.X, push_dir[1] + normal.Y, push_dir[2] + normal.Z)
     if push_dir != (0, 0, 0):
         # Normalize the push direction by the number of faces and a constant factor
-        # NOTE: Don't overdo it, or metrics will be wrong
-        n = len(faces) / 1e-3
-        push_dir = (push_dir[0] / n, push_dir[1] / n, push_dir[2] / n)
+        # NOTE: Don't overdo it, or metrics will be (more) wrong
+        n = 1e-3 / len(faces)
+        push_dir = (push_dir[0] * n, push_dir[1] * n, push_dir[2] * n)
         # Push the vertex by the normal
         v = (v[0] + push_dir[0], v[1] + push_dir[1], v[2] + push_dir[2])
     return v
@@ -103,6 +119,7 @@ def _tessellate_edge(
         mgr: GLTFMgr,
         ocp_edge: TopoDS_Edge,
         faces: List[TopoDS_Face],
+        color: ColorTuple,
         angular_deflection: float = 0.1,
         curvature_deflection: float = 0.1,
 ):
@@ -119,38 +136,12 @@ def _tessellate_edge(
             for i in range(1, discretizer.NbPoints() + 1)
         )
     ]
-    mgr.add_edge(vertices)
+
+    # Convert strip of vertices to a list of pairs of vertices
+    vertices = [(vertices[i], vertices[i + 1]) for i in range(len(vertices) - 1)]
+    mgr.add_edge(vertices, color)
 
 
-def _tessellate_vertex(mgr: GLTFMgr, ocp_vertex: TopoDS_Vertex, faces: List[TopoDS_Face]):
+def _tessellate_vertex(mgr: GLTFMgr, ocp_vertex: TopoDS_Vertex, faces: List[TopoDS_Face], color: ColorTuple):
     c = Vertex(ocp_vertex).center()
-    mgr.add_vertex(_push_point((c.X, c.Y, c.Z), faces))
-
-
-def _hashcode(obj: Union[bytes, TopoDS_Shape], **extras) -> str:
-    """Utility to compute the hash code of a shape recursively without the need to tessellate it"""
-    # NOTE: obj.HashCode(MAX_HASH_CODE) is not stable across different runs of the same program
-    # This is best-effort and not guaranteed to be unique
-    hasher = hashlib.md5(usedforsecurity=False)
-    for k, v in extras.items():
-        hasher.update(str(k).encode())
-        hasher.update(str(v).encode())
-    if isinstance(obj, bytes):
-        hasher.update(obj)
-    elif isinstance(obj, TopLoc_Location):
-        sub_data = io.BytesIO()
-        obj.DumpJson(sub_data)
-        hasher.update(sub_data.getvalue())
-    elif isinstance(obj, TopoDS_Shape):
-        map_of_shapes = TopTools_IndexedMapOfShape()
-        TopExp.MapShapes_s(obj, map_of_shapes)
-        for i in range(1, map_of_shapes.Extent() + 1):
-            sub_shape = map_of_shapes.FindKey(i)
-            sub_data = io.BytesIO()
-            TopoDS_Shape.DumpJson(sub_shape, sub_data)
-            val = sub_data.getvalue()
-            val = re.sub(b'"this": "[^"]*"', b'', val)  # Remove memory address
-            hasher.update(val)
-    else:
-        raise ValueError(f'Cannot hash object of type {type(obj)}')
-    return hasher.hexdigest()
+    mgr.add_vertex(_push_point((c.X, c.Y, c.Z), faces), color)

yacv_server/yacv.py

@@ -0,0 +1,499 @@
+import atexit
+import base64
+import copy
+import inspect
+import os
+import signal
+import sys
+import threading
+import time
+from dataclasses import dataclass
+from enum import Enum, auto
+from http.server import ThreadingHTTPServer
+from io import BytesIO
+from threading import Thread
+from typing import Optional, Dict, Union, Callable, List, Tuple
+
+from OCP.TopLoc import TopLoc_Location
+from OCP.TopoDS import TopoDS_Shape
+from PIL import Image
+# noinspection PyProtectedMember
+from build123d import Shape, Axis, Location, Vector
+from dataclasses_json import dataclass_json
+
+from yacv_server.cad import _hashcode, get_color, ColorTuple
+from yacv_server.cad import get_shape, grab_all_cad, CADCoreLike, CADLike
+from yacv_server.gltf import get_version
+from yacv_server.myhttp import HTTPHandler
+from yacv_server.mylogger import logger
+from yacv_server.pubsub import BufferedPubSub
+from yacv_server.rwlock import RWLock
+from yacv_server.tessellate import tessellate
+
+
+@dataclass_json
+@dataclass
+class UpdatesApiData:
+    """Data sent to the client through the updates API"""
+    name: str
+    """Name of the object. Should be unique unless you want to overwrite the previous object"""
+    hash: str
+    """Hash of the object, to detect changes without rebuilding the object"""
+    is_remove: Optional[bool]
+    """Whether to remove the object from the scene. If None, this is a shutdown request"""
+
+
+YACVSupported = Union[bytes, CADCoreLike]
+
+
+class UpdatesApiFullData(UpdatesApiData):
+    obj: YACVSupported
+    """The OCCT object (not serialized)"""
+    kwargs: Optional[Dict[str, any]]
+    """The show_object options, if any (not serialized)"""
+
+    def __init__(self, obj: YACVSupported, name: str, _hash: str, is_remove: Optional[bool] = False,
+                 kwargs: Optional[Dict[str, any]] = None):
+        self.name = name
+        self.hash = _hash
+        self.is_remove = is_remove
+        self.obj = obj
+        self.kwargs = kwargs
+
+    def to_json(self) -> str:
+        # noinspection PyUnresolvedReferences
+        return super().to_json()
+
+
+class YACVProtocol(Enum):
+    """Enum of communication protocols supported by the server"""
+    HTTP = auto()
+    """The recommended protocol for any platform that can run a web server."""
+    STDERR = auto()
+    """Prints the updates one by one to stderr (first metadata, then base64 of glb file) using a special prefix. Required for Pyodide support."""
+
+
+class YACV:
+    """The main yacv_server class, which manages the web server and the CAD objects."""
+
+    # Startup
+    protocol: YACVProtocol
+    """The protocol used by the server. Defaults to HTTP, but can be set to STDERR for Pyodide support."""
+    server_thread: Optional[Thread]
+    """The main thread running the server (will spawn other threads for each request)"""
+    server: Optional[ThreadingHTTPServer]
+    """The server object"""
+    startup_complete: threading.Event
+    """Event to signal when the server has started"""
+
+    # Running
+    show_events: BufferedPubSub[UpdatesApiFullData]
+    """PubSub for show events (objects to be shown in/removed from the scene)"""
+    build_events: Dict[str, BufferedPubSub[bytes]]
+    """PubSub for build events (objects that were built)"""
+    build_events_lock: threading.Lock
+    """Lock to ensure that objects are only built once"""
+
+    # Shutdown
+    at_least_one_client: threading.Event
+    """Event to signal when at least one client has connected"""
+    shutting_down: threading.Event
+    """Event to signal when the server is shutting down"""
+    frontend_lock: RWLock
+    """Lock to ensure that the frontend has finished working before we shut down"""
+
+    texture: Optional[Tuple[bytes, str]]
+    """Default texture to use for model faces, in (data, mimetype) format.
+    If left as None, no texture will be used.
+    
+    It can be set with the YACV_TEXTURE=<uri> and overridden by the custom `yacv_texture` attribute of an object.
+    The <uri> can be file:<path> or data:<mime>;base64,<data> where <mime> is the mime type and 
+    <data> is the base64 encoded image."""
+
+    color_faces: Optional[ColorTuple]
+    """Overrides the default color to use for model faces. Applies even if a texture is used. 
+    
+    You can use `show(..., color_faces=...)` or the standard way of setting colors for build123d/cadquery objects to 
+    override this color.
+    
+    It can be set with the YACV_COLOR_FACES=<color> environment variable, where <color> is a color
+    in the hexadecimal format #RRGGBB or #RRGGBBAA."""
+
+    color_edges: Optional[ColorTuple]
+    """Overrides the default color to use for model edges. 
+    
+    You can use `show(..., color_edges=...) or the standard way of setting colors for build123d/cadquery objects to
+    override this color.
+        
+    It can be set with the YACV_COLOR_EDGES=<color> environment variable, where <color> is a color
+    in the hexadecimal format #RRGGBB or #RRGGBBAA."""
+
+    color_vertices: Optional[ColorTuple]
+    """Overrides the default color to use for model vertices.
+    
+    You can use `show(..., color_vertices=...)` or the standard way of setting colors for build123d/cadquery objects to
+    override this color.
+    
+    It can be set with the YACV_COLOR_VERTICES=<color> environment variable, where <color> is a color
+    in the hexadecimal format #RRGGBB or #RRGGBBAA."""
+
+    def __init__(self):
+        """Initializes the YACV server"""
+        raw_protocol = os.getenv('YACV_PROTOCOL', 'http' if sys.platform != 'emscripten' else 'stderr').upper()
+        self.protocol = YACVProtocol[raw_protocol] if raw_protocol in YACVProtocol.__members__ else YACVProtocol.HTTP
+        self.server_thread = None
+        self.server = None
+        self.startup_complete = threading.Event()
+        self.show_events = BufferedPubSub()
+        self.build_events = {}
+        self.build_events_lock = threading.Lock()
+        self.at_least_one_client = threading.Event()
+        self.shutting_down = threading.Event()
+        self.frontend_lock = RWLock()
+        self.texture = _read_texture_uri(os.getenv("YACV_TEXTURE"))
+        self.color_faces = _read_color(os.getenv("YACV_COLOR_FACES", "#ffbf00"))  # Default yellow
+        self.color_edges = _read_color(os.getenv("YACV_COLOR_EDGES", "#1a1aff"))  # Default blue
+        self.color_vertices = _read_color(os.getenv("YACV_COLOR_VERTICES", "#1a1a1a"))  # Default dark gray
+        logger.info('Using yacv-server v%s', get_version())
+
+    def start(self):
+        """Starts the web server in the background"""
+        if self.protocol == YACVProtocol.STDERR: return  # No server to start, just print to stderr
+        assert self.server_thread is None, "Server currently running, cannot start another one"
+        assert self.startup_complete.is_set() is False, "Server already started"
+        # Start the server in a separate daemon thread
+        self.server_thread = Thread(target=self._run_server, name='yacv_server', daemon=True)
+        signal.signal(signal.SIGINT | signal.SIGTERM, self.stop)
+        atexit.register(self.stop)
+        self.server_thread.start()
+        logger.info('Server started (requested)...')
+        # Wait for the server to be ready before returning
+        while not self.startup_complete.wait():
+            time.sleep(0.01)
+        logger.info('Server started (received)...')
+
+    # noinspection PyUnusedLocal
+    def stop(self, *args):
+        """Stops the web server"""
+        if self.protocol == YACVProtocol.STDERR: return  # No server to stop, just print to stderr
+        # The remainder is for the HTTP protocol only
+        if self.server_thread is None:
+            logger.error('Cannot stop server because it is not running')
+            return
+
+        # Inform the server that we are shutting down
+        self.shutting_down.set()
+        # noinspection PyTypeChecker
+        self._show_event(UpdatesApiFullData(name='__shutdown', _hash='', is_remove=None, obj=None))
+
+        # If we were too fast, ensure that at least one client has connected
+        graceful_secs_connect = float(os.getenv('YACV_GRACEFUL_SECS_CONNECT', 12.0))
+        if graceful_secs_connect > 0:
+            start = time.time()
+            try:
+                if not self.at_least_one_client.is_set():
+                    logger.warning(
+                        'Waiting for at least one frontend request before stopping server, cancel with CTRL+C...')
+                while (not self.at_least_one_client.wait(graceful_secs_connect / 10) and
+                       time.time() - start < graceful_secs_connect):
+                    time.sleep(0.01)
+            except KeyboardInterrupt:
+                pass
+
+        # Wait for the server to stop gracefully (all frontends to stop working)
+        graceful_secs_request = float(os.getenv('YACV_GRACEFUL_SECS_WORK', 1000000))
+        with self.frontend_lock.w_locked(timeout=graceful_secs_request):
+            # Stop the server
+            self.server.shutdown()
+
+            # Wait for the server thread to stop
+            self.server_thread.join(timeout=30)
+            self.server_thread = None
+            if len(args) >= 1 and args[0] in (signal.SIGINT, signal.SIGTERM):
+                sys.exit(0)  # Exit with success
+
+    _yacvServerModelPrefix = "yacv_server://model/"
+
+    def _run_server(self):
+        """Runs the web server"""
+        logger.info('Starting server in %s mode...', self.protocol.name)
+        self.server = ThreadingHTTPServer(
+            (os.getenv('YACV_HOST', 'localhost'), int(os.getenv('YACV_PORT', 32323))),
+            lambda a, b, c: HTTPHandler(a, b, c, yacv=self))
+        # noinspection HttpUrlsUsage
+        logger.info(f'Serving at http://{self.server.server_name}:{self.server.server_port}')
+        self.startup_complete.set()
+        self.server.serve_forever()
+
+    def _show_event(self, event: UpdatesApiFullData):
+        """Handles a show event by publishing it to the show events buffer (and special handling for stderr protocol)."""
+        self.show_events.publish(event)
+        # If the protocol is STDERR, we need to print the event to stderr
+        if self.protocol == YACVProtocol.STDERR:
+            msg = f'{self._yacvServerModelPrefix}{event.to_json()}'
+            if not event.is_remove:
+                # Always build the object even if the interface already has it (optimization disabled for Pyodide)
+                glb_and_hash = self.export(event.name)
+                if glb_and_hash is None:
+                    logger.warning('Object %s not found, ignoring it...', event.name)
+                    return
+                glb = glb_and_hash[0]
+                msg += f'{base64.b64encode(glb).decode("utf-8")}'
+            print(msg, file=sys.stderr, flush=True)
+
+    def show(self, *objs: List[YACVSupported], names: Optional[Union[str, List[str]]] = None, **kwargs):
+        """
+        Shows the given CAD objects in the frontend. The objects will be tessellated and converted to GLTF. Optionally,
+        the following keyword arguments can be used:
+
+        - auto_clear: Whether to clear the previous objects before showing the new ones (default: True)
+        - texture: The texture to use for the faces of the object (see `YACV.texture` for more info)
+        - color: The default color to use for the objects (can be overridden by the `color` attribute of each object)
+        - tolerance: The tolerance for tessellating the object (default: 0.1)
+        - angular_tolerance: The angular tolerance for tessellating the object (default: 0.1)
+        - faces: Whether to tessellate and show the faces of the object (default: True)
+        - edges: Whether to tessellate and show the edges of the object (default: True)
+        - vertices: Whether to tessellate and show the vertices of the object (default: True)
+
+        :param objs: The CAD objects to show. Can be CAD-like objects (solids, locations, etc.) or bytes (GLTF) objects.
+        :param names: The names of the objects. If None, the variable names will be used (if possible). The number of
+            names must match the number of objects. An object of the same name will be replaced in the frontend.
+        :param kwargs: Additional options for the show_object event.
+        """
+        # Prepare the arguments
+        start = time.time()
+        names = names or [_find_var_name(obj) for obj in objs]
+        if isinstance(names, str):
+            names = [names]
+        assert len(names) == len(objs), 'Number of names must match the number of objects'
+        for color_name in ('color_faces', 'color_edges', 'color_vertices'):
+            if color_name in kwargs:
+                kwargs[color_name] = get_color(kwargs[color_name]) or _read_color(kwargs[color_name])
+
+        # Handle auto clearing of previous objects
+        if kwargs.get('auto_clear', True):
+            self.clear(except_names=names)
+
+        # Remove a previous object event with the same name
+        for old_event in self.show_events.buffer():
+            if old_event.name in names:
+                self.show_events.delete(old_event)
+                if old_event.name in self.build_events:
+                    del self.build_events[old_event.name]
+
+        # Publish the show event
+        for obj, name in zip(objs, names):
+            obj_color = get_color(obj)
+            # Some properties may be lost in preprocessing, so save them in kwargs
+            _kwargs = kwargs.copy()
+            if obj_color is not None:
+                _kwargs['color_obj'] = obj_color  # Only applies to highest-dimensional objects
+            _kwargs['texture'] = _read_texture_uri(getattr(obj, 'yacv_texture', None) or kwargs.get('texture', None))
+            if not isinstance(obj, bytes):
+                obj = _preprocess_cad(obj, **_kwargs)
+            _hash = _hashcode(obj, **_kwargs)
+            event = UpdatesApiFullData(name=name, _hash=_hash, obj=obj, kwargs=_kwargs or {})
+            self._show_event(event)
+
+        logger.info('show %s took %.3f seconds', names, time.time() - start)
+
+    def show_cad_all(self, **kwargs):
+        """Publishes all CAD objects in the current scope to the server. See `show` for more details."""
+        all_cad = list(grab_all_cad())  # List for reproducible iteration order
+        self.show(*[cad for _, cad in all_cad], names=[name for name, _ in all_cad], **kwargs)
+
+    def remove(self, name: str):
+        """Removes a previously-shown object from the scene"""
+        show_events = self._show_events(name)
+        if len(show_events) > 0:
+            # Ensure only the new remove event remains for this name
+            for old_show_event in show_events:
+                self.show_events.delete(old_show_event)
+
+            # Delete any cached object builds
+            with self.build_events_lock:
+                if name in self.build_events:
+                    del self.build_events[name]
+
+            # Publish the remove event
+            show_event = copy.copy(show_events[-1])
+            show_event.is_remove = True
+            self._show_event(show_event)
+
+    def clear(self, except_names: List[str] = None):
+        """Clears all previously-shown objects from the scene"""
+        if except_names is None:
+            except_names = []
+        for event in self.show_events.buffer():
+            if event.name not in except_names:
+                self.remove(event.name)
+
+    def shown_object_names(self, apply_removes: bool = True) -> List[str]:
+        """Returns the names of all objects that have been shown"""
+        res = set()
+        for obj in self.show_events.buffer():
+            if not obj.is_remove or not apply_removes:
+                res.add(obj.name)
+            else:
+                res.discard(obj.name)
+        return list(res)
+
+    def _show_events(self, name: str, apply_removes: bool = True) -> List[UpdatesApiFullData]:
+        """Returns the show events with the given name"""
+        res = []
+        for event in self.show_events.buffer():
+            if event.name == name:
+                if not event.is_remove or not apply_removes:
+                    res.append(event)
+                else:
+                    # Also remove the previous events
+                    for old_event in res:
+                        if old_event.name == event.name:
+                            res.remove(old_event)
+        return res
+
+    def export(self, name: str) -> Optional[Tuple[bytes, str]]:
+        """Export the given previously-shown object to a single GLB blob, building it if necessary."""
+        start = time.time()
+
+        # Check that the object to build exists and grab it if it does
+        events = self._show_events(name)
+        if len(events) == 0:
+            logger.warning('Object %s not found', name)
+            return None
+        event = events[-1]
+
+        # Use the lock to ensure that we don't build the object twice
+        with self.build_events_lock:
+            # If there are no object events for this name, we need to build the object
+            if name not in self.build_events:
+                logger.debug('Building object %s with hash %s', name, event.hash)
+
+                # Prepare the pubsub for the object
+                publish_to = BufferedPubSub[bytes]()
+                self.build_events[name] = publish_to
+
+                # Build and publish the object (once)
+                if isinstance(event.obj, bytes):  # Already a GLTF
+                    publish_to.publish(event.obj)
+                else:  # CAD object to tessellate and convert to GLTF
+                    gltf = tessellate(
+                        event.obj,
+                        color_faces=event.kwargs.get('color_faces', self.color_faces),
+                        color_edges=event.kwargs.get('color_edges', self.color_edges),
+                        color_vertices=event.kwargs.get('color_vertices', self.color_vertices),
+                        color_obj=event.kwargs.get('color_obj', None),
+                        tolerance=event.kwargs.get('tolerance', 0.1),
+                        angular_tolerance=event.kwargs.get('angular_tolerance', 0.1),
+                        faces=event.kwargs.get('faces', True), edges=event.kwargs.get('edges', True),
+                        vertices=event.kwargs.get('vertices', True),
+                        texture=event.kwargs.get('texture', self.texture))
+                    glb_list_of_bytes = gltf.save_to_bytes()
+                    glb_bytes = b''.join(glb_list_of_bytes)
+                    publish_to.publish(glb_bytes)
+                    logger.info('export(%s) took %.3f seconds, %s', name, time.time() - start,
+                                sizeof_fmt(len(glb_bytes)))
+
+            # In either case return the elements of a subscription to the async generator
+            subscription = self.build_events[name].subscribe()
+            try:
+                return next(subscription), event.hash
+            finally:
+                # noinspection PyInconsistentReturns
+                subscription.close()
+
+    def export_all(self, folder: str,
+                   export_filter: Callable[[str, Optional[CADCoreLike]], bool] = lambda name, obj: True):
+        """Export all previously-shown objects to GLB files in the given folder"""
+        os.makedirs(folder, exist_ok=True)
+        for name in self.shown_object_names():
+            if export_filter(name, self._show_events(name)[-1].obj):
+                with open(os.path.join(folder, f'{name}.glb'), 'wb') as f:
+                    f.write(self.export(name)[0])
+
+
+def _read_texture_uri(uri: str) -> Optional[Tuple[bytes, str]]:
+    if uri is None:
+        return None
+    if uri.startswith("file:"):
+        path = uri[len("file:"):]
+        with open(path, 'rb') as f:
+            data = f.read()
+        buf = BytesIO(data)
+        img = Image.open(buf)
+        mtype = img.get_format_mimetype()
+        return data, mtype
+    if uri.startswith("data:"):  # https://en.wikipedia.org/wiki/Data_URI_scheme#Syntax (limited)
+        mtype_and_data = uri[len("data:"):]
+        mtype = mtype_and_data.split(";", 1)[0]
+        data_str = mtype_and_data.split(",", 1)[1]
+        data = base64.b64decode(data_str)
+        return data, mtype
+    return None
+
+
+def _read_color(color: str) -> Optional[ColorTuple]:
+    """Reads a color from a string in the format #RRGGBB or #RRGGBBAA"""
+    if color is None:
+        return None
+    if not color.startswith('#') or len(color) not in (7, 9):
+        raise ValueError(f'Invalid color format: {color}')
+    r = float(int(color[1:3], 16)) / 255.0
+    g = float(int(color[3:5], 16)) / 255.0
+    b = float(int(color[5:7], 16)) / 255.0
+    a = float(int(color[7:9], 16)) / 255.0 if len(color) == 9 else 1.0
+    return r, g, b, a
+
+
+# noinspection PyUnusedLocal
+def _preprocess_cad(obj: CADLike, **kwargs) -> CADCoreLike:
+    # Get the shape of a CAD-like object
+    obj = get_shape(obj)
+
+    # Convert Z-up (OCCT convention) to Y-up (GLTF convention)
+    if isinstance(obj, TopoDS_Shape):
+        obj = Shape(obj).rotate(Axis.X, -90).wrapped
+    elif isinstance(obj, TopLoc_Location):
+        tmp_location = Location(obj)
+        tmp_location.position = Vector(tmp_location.position.X, tmp_location.position.Z,
+                                       -tmp_location.position.Y)
+        tmp_location.orientation = Vector(tmp_location.orientation.X - 90, tmp_location.orientation.Y,
+                                          tmp_location.orientation.Z)
+        obj = tmp_location.wrapped
+
+    return obj
+
+
+_obj_name_counts = {}
+
+
+def _find_var_name(obj: any, avoid_levels: int = 2) -> str:
+    """A hacky way to get a stable name for an object that may change over time"""
+
+    # Build123d objects have a "label" property, CadQuery Assembly's have "name"
+    for f in ('label', 'name'):
+        if hasattr(obj, f):
+            v = getattr(obj, f)
+            if v != '':
+                return v;
+
+    # Otherwise walk up our stack to see if there's a local variable that points to it
+    obj_shape = get_shape(obj, error=False) or obj
+    for frame in inspect.stack()[avoid_levels:]:
+        for key, value in frame.frame.f_locals.items():
+            if get_shape(value, error=False) is obj_shape:
+                return key
+
+    # Last resort, name it for its type with a disambiguating number
+    global _obj_name_counts
+    t = obj.__class__.__name__
+    _obj_name_counts[t] = 1 if t not in _obj_name_counts else _obj_name_counts[t] + 1
+    return t + str(_obj_name_counts[t])
+
+
+def sizeof_fmt(num, suffix="B"):
+    for unit in ("", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"):
+        if abs(num) < 1024.0:
+            return f"{num:3.1f}{unit}{suffix}"
+        num /= 1024.0
+    return f"{num:.1f}Yi{suffix}"