DirectX vs OpenGL

[flakbait]

I've been kinda curious about this for a while now. With the Ah2 beta progressing nicely with the new engine, and a couple new games coming out that use an OpenGL engine, I was wondering what the big pros and cons were to each one. I know DirectX uses M$ code and that it can be really tempermental, but I haven't heard much about OpenGL. Except, of course, that Q3/MoH/CoD use it and produce some really amazing visuals.

Care to enlighten an uninformed soul?





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Flakbait [Delta6]
Delta Six's Flight School
Put the P-61B in Aces High

[FOGOLD]

I tried Forgotten Battles in both and Half Life in both and I'll be b*****ed if I can see any difference whatsoever.