Opengl drawing a 2d overlay on a 3d scene problem

Question

I have a moving 3d scene set up, and I want to make a stationary 2d GUI overlay that is always on top, when I try making 2d shapes I don\'t see anything. When I call: glMatr

Answer 1

In addition, I also use a separate FBO for these kind of things. Usually the overlay doesn't have to be redrawn all the time, so render it on demand to a FBO and just render it as a fullscreen quad each frame. It wastes some fillrate but in general I find it is usually faster anyway and makes the code so much cleaner.