I use  babylon.2.4.0-alpha with cannon version 0.6.2 (for physics and SphereImpostor   I need cannon because it implements mesh impostor. I have ball and set it this values playBall.setPhysicsState( { impostor: BABYLON.PhysicsEngine.SphereImpostor, mass: 1, restitution: 0 } ); Can anybody tell me if there are problems with mass and restitution, because if I change value there is no diffrenece !   If I use oimo physics then there is difference if I cha