Download Compound Collider Generator FREE Unity.
Compound Collider Generator (CCG) is a tool that makes the creation of collider meshes for complex, concave shapes easier. Using the Unity feature of Compound Colliders, CCG automatically creates child objects with Collider components on your selected GameObject.
Compound colliders allow you to create concave collision meshes for your dynamic Rigidbody objects, a feature not possible when using concave MeshColliders. Compound colliders also typically give better performance than MeshCollider objects and better reliability.