diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index d7dd672..e886e3e 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -27,6 +27,18 @@ export function elementKey(modelId: string, el: THREE.Object3D): string {
   return `${modelId}:${id}`;
 }
 
+/** Globally accessible ref to the active R3F scene (set by SceneRefCapture). */
+export const sceneRef: { current: THREE.Scene | null } = { current: null };
+
+function SceneRefCapture() {
+  const { scene } = useThree();
+  useEffect(() => {
+    sceneRef.current = scene;
+    return () => { if (sceneRef.current === scene) sceneRef.current = null; };
+  }, [scene]);
+  return null;
+}
+
 
 function LoadingFallback() {
   return (