Why is there a different collisions point with constant setup?

Question

I have a bouncing ball in my game. Every time I start the game, the ball direction (a Vector3) and speed are constant. The ball has a rigidbody too. I'm using OnTriggerEnter to detect collisions.

After starting the game the ball will move to a wall. The question is, why is the collision point different every time?

Answer 1

i used FixedUpdate() insted of FixUpdate() and problem solved.