Hello, I'm looking at making a golf game, but having looked into the physics side of it, I'm hitting an issue related to collision normals. This is in 3D and the course will be made out of a fairly smooth mesh. The issue is that for the physics update the normals are per-triangle, and not smoothed. This is highlighted in a video posted by another user comparing the normals returned by physics collisions for both a hard-edged mesh and a smooth shaded mesh (note the red normals match despite one being smooth). What I'm after is smooth, interpolated normals during collision: There's two aspects to this: 1. Is there a way of getting smooth normals, so that regardless of how detailed the mesh is, it still generates smooth normals across a triangle if it's vertices have unique normals? 2. Unity still hasn't exposed contact modification during the PhysX update. If this was possible then on contact, I could look up the correct, smooth normal from my own data for that contact location. Does anybody have any information on either of the above two points? Or does anybody know of another way to solve this?