sorry man but i think you must be mistaken. virtually all cards support opengl, but very few support it fully. how come i can run my app with conventional picking on my pc fine, but if i stick in another (mainstream widely used ati card) it messes up. i have done a lot of testing with this, and am sure i am right. i have read elsewhere of many people having the same problem. for example the creater of an opengl modeller (www.cornflakezone.com) has had this problem.

finally i would say i am having problems with this rainbow coloring technique, does anyone know where i can get some decent sourcecode to learn from, as to say this problem is such a massive one, there is very little written about it

thanks