Function useScene

React hook returning a kit-owned Scene. The Scene is constructed once per host component and tracked via useSyncExternalStore, so React re- renders on every Scene mutation (including undo/redo).

Two call shapes:

• Trivial: useScene({ items }) — one auto-registered system layer named 'default', each item added as a leaf with pose === data === item. Cheapest path for "a flat list of rects."
• Full: useScene({ systemLayers, initial?, ops?, ... }) — explicit layers, parenting, and custom op registration.

React hook returning a kit-owned Scene. The Scene is constructed once per host component and tracked via useSyncExternalStore, so React re- renders on every Scene mutation (including undo/redo).

Two call shapes:

• Trivial: useScene({ items }) — one auto-registered system layer named 'default', each item added as a leaf with pose === data === item. Cheapest path for "a flat list of rects."
• Full: useScene({ systemLayers, initial?, ops?, ... }) — explicit layers, parenting, and custom op registration.