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## Summary The scene widget's serializeValue uploaded a fresh temp image on every queue, so the `image / mask / normal` filenames in the prompt JSON were new each run. The backend cache key (which hashes those input strings) never matched, forcing Load3D and every downstream node to re-execute even when the user changed nothing. Track a session-scoped dirty flag and last-output cache in module-level WeakMaps keyed by LGraphNode. serializeValue returns the cached output when nothing has changed; user actions that mutate the visible scene (scene/model/camera/light config, animation, recording, gizmo, camera orbit) mark dirty through useLoad3d watchers and event handlers. The model_file / width / height widget callbacks invalidate via a new optional onSceneInvalidated hook plumbed through Load3DConfiguration, so the captured screenshot stays consistent with the inputs the backend sees. ## Screenshots (if applicable) Before https://github.com/user-attachments/assets/5ee5f79f-dd38-401e-babe-4d6ea156e56d After https://github.com/user-attachments/assets/5e00beb4-937c-4c66-abb2-e455f5301de6