[ODE] 16 bits indices and TriMesh

[Hannes Norda]

> > Is there any other way working around this problem than me cloning
> > indexbuffers or changing my renderingengine to using 32bits indices
instead of
> > 16bits?
> You can enable MeshInterface callbacks by defining
> #define OPC_USE_CALLBACKS
>
> And then changing the trimesh code to setup the callbacks to generate the
> triangle vertices.
>
> If performance is a problem it might be worth making a new #define in
> MeshInterface and changing the mesh data to shorts.
>
> Joe Ante
>

I overlooked the OPC_USE_CALLBACKS, it seems very likely that this will do
the trick.
I tried hacking the IndexedTriangle class to use uwords instead of udwords
but all hell broke loose, so I gonna give the callbacks a try today....

Cheers

/Hannes