Hi, I think you answered such a question over and over, How to make a head up display that surrounds a viewport of a camera (ortho or perspective)
Thanx alot.

Your question is vague.Can you describe more?

Here’s a wild guess: Set an orthographic projection with glOrtho, load an identity on the modelview stack, then draw your overlays at will. This is a common approach for game HUDs.

Is that what you mean?