fn watch_poses(sender: &JobSender) -> SnapshotReader<GamePhysics>Expand description
Watch the physics world’s body poses.
The collector walks the rapier world on the physics thread and copies the moving bodies’ transforms; it answers nothing while they are unchanged, so a world whose bodies are all asleep publishes no snapshot at all. The snapshot carries state, not history: a body that moved twice between two reads is seen once, where it is now.