Update OCCT, Add GUI Tools, b123d Script Support

index.html

@@ -73,6 +73,7 @@ <h1 hidden></h1>
                 <select id="editorMode" class="topnav-select" title="Editor Language Mode">
                     <option value="cascadestudio">CascadeStudio JS</option>
                     <option value="openscad">OpenSCAD</option>
+                    <option value="python">Python (build123d)</option>
                 </select>
             </div>
         </div>

packages/cascade-core/package.json

@@ -35,9 +35,11 @@
 		"types/"
 	],
 	"dependencies": {
-		"opencascade.js": "github:zalo/opencascade.js#cascadestudio-v2",
+		"brython": "^3.14.3",
+		"opencascade.js": "github:zalo/opencascade.js#cascadestudio-v3-occt801",
 		"openscad-parser": "^0.6.3",
 		"opentype.js": "^1.3.4",
-		"potpack": "^2.0.0"
+		"potpack": "^2.0.0",
+		"quickhull3d": "^3.1.2"
 	}
 }

packages/cascade-core/scripts/build.cjs

@@ -17,7 +17,8 @@ if (fs.existsSync(distDir)) {
 }
 fs.mkdirSync(distDir, { recursive: true });
 
-// 1. Bundle the worker entry point
+// 1. Regenerate the oc.* symbol manifest, then bundle the worker entry point
+require('./generate-occt-symbols.cjs');
 console.log('[cascade-core] Bundling worker...');
 execFileSync(npx, [
   'esbuild',
@@ -38,7 +39,14 @@ if (fs.existsSync(wasmSrc)) {
   fs.copyFileSync(wasmSrc, path.join(distDir, 'cascadestudio.wasm'));
 }
 
-// 3. Copy fonts to dist/fonts/
+// 3. Copy Brython (lazy-loaded by the worker for Python/build123d mode)
+console.log('[cascade-core] Copying Brython...');
+const brythonSrc = path.join(monoRoot, 'node_modules', 'brython', 'brython.js');
+if (fs.existsSync(brythonSrc)) {
+  fs.copyFileSync(brythonSrc, path.join(distDir, 'brython.js'));
+}
+
+// 4. Copy fonts to dist/fonts/
 console.log('[cascade-core] Copying fonts...');
 const fontsDir = path.join(pkgRoot, 'fonts');
 const distFontsDir = path.join(distDir, 'fonts');

packages/cascade-core/scripts/generate-occt-symbols.cjs

@@ -0,0 +1,35 @@
+/**
+ * Scans the worker sources for every `oc.<Symbol>` reference and writes
+ * UsedOCCTSymbols.generated.js. The worker verifies this list against the
+ * loaded WASM at startup.
+ *
+ * Why: the Embind binding generator derives numbered overload suffixes
+ * (e.g. BRepBuilderAPI_MakeEdge_24) from each class's overload set. A new
+ * OCCT version can silently renumber them, which previously surfaced only
+ * as cryptic "not a constructor" errors deep inside user evaluations.
+ */
+const fs = require('fs');
+const path = require('path');
+
+const workerDir = path.join(__dirname, '..', 'src', 'worker');
+const outFile = path.join(workerDir, 'UsedOCCTSymbols.generated.js');
+
+const symbols = new Set();
+for (const file of fs.readdirSync(workerDir)) {
+  if (!file.endsWith('.js') || file.endsWith('.generated.js')) { continue; }
+  const src = fs.readFileSync(path.join(workerDir, file), 'utf8');
+  for (const m of src.matchAll(/\boc\.([A-Za-z_][A-Za-z0-9_]*)/g)) {
+    symbols.add(m[1]);
+  }
+}
+
+const sorted = [...symbols].sort();
+const banner =
+  '// GENERATED by scripts/generate-occt-symbols.cjs — do not edit.\n' +
+  '// Every oc.* symbol referenced by the worker sources. Verified against\n' +
+  '// the loaded OpenCascade module at startup (see CascadeWorker.init).\n';
+fs.writeFileSync(
+  outFile,
+  banner + 'export const USED_OCCT_SYMBOLS = ' + JSON.stringify(sorted, null, 2) + ';\n'
+);
+console.log(`[cascade-core] ${sorted.length} oc.* symbols -> ${path.relative(process.cwd(), outFile)}`);

packages/cascade-core/src/engine/CascadeEngine.js

@@ -58,16 +58,19 @@ class CascadeEngine {
 
   /** Evaluate CAD code and return mesh data.
    *  Fires intermediate events (log, addSlider, etc.) in real-time.
+   *  `language` selects the worker runtime ('cascadestudio' default;
+   *  'python' evaluates build123d-lite code via Brython).
    *  Returns: { meshData: { faces, edges }, sceneOptions, logs, errors } */
-  async evaluate(code, { guiState = {}, maxDeviation, sceneOptions } = {}) {
+  async evaluate(code, { guiState = {}, maxDeviation, sceneOptions, language } = {}) {
     if (!this._ready) throw new Error('CascadeEngine not initialized. Call init() first.');
 
     this._working = true;
 
     // Send evaluation command (fire-and-forget — worker processes asynchronously)
     this._messageBus.send('Evaluate', {
       code,
-      GUIState: guiState
+      GUIState: guiState,
+      language
     });
 
     // Request meshing — this returns a Promise that resolves with [facesAndEdges, sceneOptions]
@@ -83,9 +86,9 @@ class CascadeEngine {
 
     if (!result) return { meshData: null, sceneOptions: {} };
 
-    const [[faces, edges], resultSceneOptions] = result;
+    const [[faces, edges], resultSceneOptions, shapeLines] = result;
     return {
-      meshData: { faces, edges },
+      meshData: { faces, edges, shapeLines: shapeLines || [] },
       sceneOptions: resultSceneOptions || {}
     };
   }