I want to throw a ball at a mesh and detect its collision. It has to be quite accurate so a box collider won't suffice. In an older Unity version I just added a Mesh Collider with the flag "trigger" set and it worked perfectly. With Unity5 I have to flag the collider as "Convex" in order to select "Is Trigger"... the problem is that now I get an error: Cooking::cookConvexMesh: user-provided hull must have less than 256 vertices! and it doesn't work anymore. I can't reduce the number of vertices to less than 256... what can I do? Please help.