Man, having a dayjob can be such a pain sometimes! I haven''t had time to visit this forum in weeks! But I suppose I shouldn''t complain, having to work too many hours and take too many trips is better than not getting to work. At least for someone like me who hasn''t won the lottery or inherited a lot of money! Anyway, I used MFC to make a simple blending demo. Nothing to write home about at all but if you want to quickly play around with changing the parameters it might be useful. If anyone has any suggestions on how to extend it (I realize I''m reinventing a wheel that''s been reinvented about 50000 times, but hey, a learning experience is a learning experience right?), I will gratefully entertain them. I''m already considering adding a light, for experimentation on how changing that 4th parameter to the light functions affects the overall outcome, and maybe even playing around with materials. It''s at the end of this page: http://daltxcoltsfan.tripod.com/OpenGL/OpenGL.htm Joe P.S. apologies for the popup ads!