> In short, I was aiming my comments mostly at the use of the dSpaceCollide callback, NOT at actually using dCollide. I see what you mean, that would take advantage of the hash space too. BTW, what is ODE's hash space internally - is it an octree? > Afaik, that's the correct way to spell it: Frustrum. :) Unfortunately no (it would give my brain a break ;): http://www.yourdictionary.com/ahd/f/f0346500.html -- gl