It looks like the TIR version needs to have a greater Max Ray Depth. I'm pretty sure that's why some of the surfaces are dark and not reflecting the scene becuase when Bryce hits the MRD, it just colors the surface. I've never understood how Byrce chooses this color but it's usually a shade of gray. For glass/TIR scenes I always set the ray depth quite large, around 100 MRD. This way I can be sure that no rays are cut off too soon. Just becuase it's set to 100 doesn't mean that every ray gets bounced that many times, the ray trace bounce still stops when it hits something "solid". Excellent image; Dan