refactor: establish unified viewer workspaces

apps/viewer-3d/src/viewer/modelLoader.ts

@@ -62,6 +62,21 @@ async function getPLY(): Promise<PLYLoaderT> {
   return (_ply = new PLYLoader());
 }
 
+function normalizePlyAttributes(geometry: THREE.BufferGeometry): void {
+  for (const name of ['position', 'normal', 'uv', 'color']) {
+    const attribute = geometry.getAttribute(name);
+    if (!attribute || !(attribute.array instanceof Float64Array)) continue;
+    geometry.setAttribute(
+      name,
+      new THREE.Float32BufferAttribute(
+        new Float32Array(attribute.array),
+        attribute.itemSize,
+        attribute.normalized,
+      ),
+    );
+  }
+}
+
 /**
  * Load any supported model URL and resolve to a scene-addable Object3D.
  * `nameHint` carries the real file name for ext detection when `url` is a
@@ -165,7 +180,18 @@ export async function loadModel(
     case 'dae': {
       const loader = await getCollada();
       return new Promise<THREE.Object3D>((resolve, reject) => {
-        loader.load(url, (result) => resolve(result.scene), onXhr, (err) => reject(err));
+        loader.load(
+          url,
+          (result) => {
+            if (!result) {
+              reject(new Error('Collada loader returned no scene'));
+              return;
+            }
+            resolve(result.scene);
+          },
+          onXhr,
+          (err) => reject(err),
+        );
       });
     }
     case 'ply': {
@@ -174,6 +200,7 @@ export async function loadModel(
         loader.load(
           url,
           (geometry) => {
+            normalizePlyAttributes(geometry);
             const hasColor = geometry.hasAttribute('color');
             if (geometry.index) {
               // Triangle mesh