(grins!) Thanks, Electroglyph...! I will play with those settings, most of it makes sense to me from playing with RDS a while back, but of course Rhino is much more advanced... Far as I can tell, it's the most ridiculous modeler around, much more productive for me than LW Modeler, at this point! Agent Smith, I thought that the black haze and fog was the cause of the black refractions, but wasn't sure. The Ray Depth was at 6, and the TIR at 6 as well, so I'm thinking that's all it is, perhaps I'll render it on white next time...