unity sphere falls through the plane

Question

I have a elongated rigidbody sphere with Mesh Collider. It falls through the plane. (I made a rigidbody cube and does not fall through.)

I have problem with Mesh Collider repeately.. The collision of the object is not detected.

If I replace the mesh collider with box collider, it collides again.

I would like to collide a mesh collider with another mesh collider.

Answer 1

A Mesh Collider can not collide with another Mesh Collider unless Convex is checked on the Collider in question.

This is described in the Unity3D documentation: http://docs.unity3d.com/Documentation/Components/class-MeshCollider.html