elchtest mod :)

[joevenzon]

Wheels are modeled as GhostObjects and therefore don't collide themselves, but save collisions. In the new bullet version, there must be a instant Collision check, which is preferable, but I did not yet try it.

I do a discrete collision test in COLLISION_WORLD::CollideObject. The key is to call findAlgorithm on the collision dispatcher and then processCollision on the algo. I use my AABB_SPACE_PARTITIONING_NODE class to determine which pairs to test, which is faster than bullet's general broadphase algorithm (because the bullet algorithm is meant for dynamic objects and makes less assumptions).