latest (#9011)

Author: slimbuck

src/scene/gsplat-unified/gsplat-octree.js

@@ -360,7 +360,11 @@ class GSplatOctree {
      */
     ensureFileResource(fileIndex) {
         Debug.assert(fileIndex >= 0 && fileIndex < this.files.length);
-        Debug.assert(this.assetLoader);
+
+        // If octree was destroyed, assetLoader is null - nothing to load
+        if (!this.assetLoader) {
+            return;
+        }
 
         // resource already loaded
         if (this.fileResources.has(fileIndex)) {

src/scene/gsplat-unified/gsplat-world.js

@@ -447,6 +447,19 @@ class GSplatWorld {
         result.overdrawDirty = false;
         result.sortNeeded = false;
 
+        // Drop instances whose octree was destroyed (e.g. the asset was unloaded) before the
+        // layer placement change reaches reconcile - they can no longer stream and their
+        // resources are gone, so letting them run this update would assert and crash the
+        // budget pass. Mirrors the removal branch in reconcile.
+        for (const [placement, inst] of this._octreeInstances) {
+            if (inst.octree.destroyed) {
+                this._octreeInstances.delete(placement);
+                this._layerPlacementsDirty = true;
+                this._placementSetChanged = true;
+                this._octreeInstancesToDestroy.push(inst);
+            }
+        }
+
         // Cadence: a free-running metronome raises a latched request every 10 frames.
         if (--this._framesTillFullUpdate <= 0) {
             this._framesTillFullUpdate = 10;