Lazily creates the ScenePhysics for a Scene, or returns the
existing one. Auto-destroyed when the Scene fires onSceneDestroyed.
The first caller decides the rapier module and gravity; subsequent
callers are handed the same instance and the params.rapier /
params.gravity they pass in are ignored.
Lazily creates the ScenePhysics for a Scene, or returns the existing one. Auto-destroyed when the Scene fires
onSceneDestroyed.The first caller decides the rapier module and gravity; subsequent callers are handed the same instance and the
params.rapier/params.gravitythey pass in are ignored.