It is a special written terrain shader, which could be the problem. If you are good at shaders I can send it to you. It also calls atmospheric scattering and stuff, but maybe you could see the problem quickly.

Let me know if you good with shaders and I can send you a link to the .fx file.

It's pretty complex and calls a dll for atmospheric scattering. Unfortunately the guy who wrote it got in fight with bossman and quit. So if it isn't a problem anyone alse has seen before, it's probably the shader code. I have been playing around with that also but haven't found a solutions in there either with what I have done.

It just seems like the last vertex of the terrain_chunk isn't being recogninized or something screwy with it in the vertex shader to me.

Thanks,
Loco