Kedvenc véleményem Carmacktól D3D vs OGL témában:
With OpenGL, you can get something working with simple, straightforward code, then if it is warranted, you can convert to display lists or vertex arrays for max performance (although the difference usually isn't that large). This is the right way of doing things -- like converting your crucial functions to assembly language after doing all your development in C.
With D3D, you have to do everything the painful way from the beginning. Like writing a complete program in assembly language, taking many times longer, missing chances for algorithmic improvements, etc. And then finding out it doesn't even go faster.
