opengl coordinates to pixels

Hello
I would like to see a function to convert OpenGL coordinates to Pixels.
Or does it already exists?
Greetz Hylke

You can either use the feedback buffer, or simply use the gluProject and/or gluUnProject functions.
So, yes it already exists.

Originally posted by vincoof:
You can either use the feedback buffer, or simply use the gluProject and/or gluUnProject functions.
So, yes it already exists.

I already knew about the gluUnProject, but not gluProject and the feedback buffer.
Thanx Hylke