I'm working on a mobile game that involves a city scene (there will be other environments later) with buildings and cars and such. My player flies and drops a ball and I want the ball to interact via physics with the objects in the scene. Pic is attached. I have a big, thin rectangle that I've stretched across the ground and put a box collider on it so that'll work for a ground. So how do I add something to the buildings and cars so when the ball hits them, it rolls off and follows physics rules? I can't figure out if I need Rigidbodys or Colliders. Also, Mesh Colliders would be ideal because there's no way in heck I'm using multiple simple Colliders to cover a building; that would take ages to do. But if I used Mesh Colliders (if Colliders are in fact the solution) then won't that be too (processor) intensive for a mobile game? Any help would be appreciated.