Hello to you all! I 'm facing a kind of peculiar problem which I really can't say if it is my problem or Unity's ... I 'm trying to fix a Roulette through physics.. My roulette has a stationary part and a moving part. I've also a small ball (sphere). I've placed on both, the moving part and the stationary part, a rigidbody (kinematic & uses gravity) and a Mesh Collider. My ball is GameObject with a rigidbody and a sphere collider. when my sphere's scaling is X:0.04, Y:0.04, Z:0.04 the collisions do take place and the ball lies on the roulette. But when I change the scaling of the ball (where I want it to be: x: 0.01 y:0.01 z:0.01) the ball falls through the roulette and through the table!!! Am I missing something?? Has anyone any idea why this happens? Thanks in advance, kind regards!