No Collision between 2 gameObjects

The first object is the ball , it has rigidBody and sphere collider and the socend object is the bottom wall , it has a box collider
however the ball go thought the wall and no collision occurred
so , how to solve this problem ? :frowning:

The walls should have an Edge Collider (make sure Is Trigger is unchecked).

The ball should have a collider and a Rigidbody (which is not kinematic).

I think the problem is that your wall collider is a box collider and the ball is already inside the box. You don’t have to use Edge collider, just make sure that the collider doesn’t contain the ball.