Awesome ,
The volumes can also be your method of control for mouse/touch controls as well, so you may want them to be the same size of the hex depending on the platform. Now if you’re thinking more about controller usage, then it wouldn’t really matter much as you’d have another way to highlight the hexes for movement.
Adding the material to the meshes is a pretty good idea from a debug stand point. The “SHOW COLLISION” console command will actually render the entire collision mesh, even if it is normally hidden, with material. So if you have your system make changes to the “Tile Class” and that in turn propagates up to the render mesh, then you’ll have a way to debug it easily in the future.
I’m digging it =)
No performance gains that I’m aware of, perhaps super crazy minor if you were to collapse the bottom side of the collision hex, like a 6 sided cone.