I'm not sure what kinds of evil rendering times others are experiencing, but sometimes I sleep and that's when I render stuff. (grins) The effects AA options in Bryce 5 rock, you need only apply them to a complex scene with lots of transperancies and refractions. But has anyone noticed any benefit to the TIR settings? Rochr, did you use TIR on those spheres? I'm curious, I can't seem to notice any differences when using it or not.