some simple questions

[newmannium]

I am a beginner for OpenGL. Could anyone
tell me:
1) what is "GL_PROJECTION?"
2) what is "GL_MODELVIEW?"
3) what is "glOrhto?"
4) and what is "glLoadIdentity()" for?

Thank you very much!

1 and 2
Matrix stacks in gl

3 sets up a frustum with orthographic view

that is a box in front of the screen instead of a truncated pyramid

loadidentity loads the identity matrix on the active matrix stack....

[Fredy]

Look for the OpenGL red book. http://fly.cc.fer.hr/~unreal/theredbook/