[ODE] Ray-TriMesh Collider

[Vadim Macagon]

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Hehe, lots of emails from me today.

I added an extra parameter to the dGeomRay*Params(), which gives you finer
control of the proccess. I think the firstContact parameter was being used
incorrectly (so I fixed that).

Aside from that I've also changed the way the contact point is generated for
ray/mesh collision (collision_trimesh_ray.cpp), as far as I know - knowing
the T value (along the line) is sufficient to compute the point of
contact... so I didn't see the point of using barycentric coordinates (which
amounts to more computation) to work out the same thing. Likewise I don't
quite understand why the T value was computed again, since OPCODE already
did it and stored it in Faces[i].mDistance.

Patches are attached (hopefuly they'll make it into CVS in a couple of
months :P).


Cheers,

Vadim.

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