Hi, I want to apply colors (or textures) with alpha values to obj. models and then turn them around, but I am having problems if I rotate the objects. this actually causes problems with standard geos, too... I searched the archives for that problem but I found no real answer. maybe because there is none? what is necessary to get transparency working from all different viewpoints? I tried to play around with GEMglDepthFunc and other stuff, but not with the correct result. (correct maybe, but not what I wanted.) any help? thanks, marius.