Unluck Software Simple MeshCollider Combine is a easy to use editor extension that combines many mesh colliders into a single mesh collider.
Merges verts so the resulting collider will no longer have gaps. This fixes seams that causes unwanted collisions on visually smooth surfaces. Great for modular physics driven games.
Features
One click mesh collider combine tool
Fixes seams
Example scene
C# Scripts
* Designed only for 3D Mesh Colliders.
Unity 2018 compatible