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I was studying the Relsoft tutorial about OpenGL and recommend the additional tutes :

http://www.xmission.com/~nate/opengl.html

There are realtime programs that let you change values and see "on-line" how the graphics change. Highly recommended; At least it help me a lot to understand well the glRotatef command, I was very confused about it.

Greets
Tio Bit

best ogl tute ever (not for fb tho): http://nehe.gamedev.net/lesson.asp?index=01