Thanks for the response, Chip! I did manage to get pretty close to doing it last night. I don't know if you can do it in RD 3D, but I put a small bulb light at the center of my object and made the object pretty transparent. So I do now have a light in it. The problem has become adjusting the light. I've tried playing with the transparency, playing with the size of the bulb, playing with the intensity of the light, and I don't see much in the way of variation. And my script sorta calls for it to be adjustable. Haven't even started the animation step of the process. Of course, I do have to be able to animate it. I'll doubtless be back on the forum when I reach that point. ^_^ I think I'll use your plan when I don't have to animate, though. It sounds a lot less complicated.