I'm trying to use a mesh collider on the player's avatar, rather than the box collider.
I've added the mesh collider to the game object (which also has a rigid body) and selected the "convex" checkbox. However, the player still falls through all geometry, including Unity primitives, terrain, and other models.
In the mesh collider's property box, there's a value for "Mesh", which I have set to "None (Mesh)". I was led to believe this defaults to the model's own mesh, but now I'm not certain. If I change the value to something else from the "select mesh" list, like the cube, the collisions work. When I click over to Select Mesh --> Scene, the list is empty. I'm assuming I need to add the model's mesh to the list, but I can't find any documentation about that.