I’ve pushed changes to the PhysicsCollisionObject javadoc to note some properties/features that don’t apply to characters or ghost objects, specifically:
- continuous collision detection (CCD)
- contact damping/processing/stiffness
- deactivation (sleeping)
- friction
- restitution
I suspect these properties don’t apply to soft bodies either, but I haven’t analyzed the (native) code sufficiently to be certain.
