[ODE] Creating a TriList heightmap geom

[Pierre Terdiman]

> Anyone else tried tri-collider for vehicles? Or should I convert OPCODE so
> that it also uses double precision? :)

Just in case someone considers this idea seriously...  That would be totally
pointless.

At the end of the day, OPCODE provides a list of triangles to perform
collision response with. That list won't be different with double precision.
Actually OPCODE uses quantized floats, not even "real" ones. Accuracy just
isn't a problem here.

You might need it in collision response, however.

Pierre

PS : note that this would be different with other CD algorithms. For example
accuracy is an issue with GJK.