OnCollisionEnter is not called in unity

Question

I checked nearly every answer for this, but those were mostly simple errors and mistakes. My problem is that OnCollisionEnter is not called even when colliding whith other r

Answer 1

You need to make sure that the collision matrix (Edit->Project Settings->Physics) does not exclude collisions between the layers that your objects belong to.

Unity Docs

You also need to make sure that the other object has : collider, rigidbody and that the object itself or either of these components are not disabled.