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Asked: 2026-05-10T22:47:13+00:00

I am rendering an OpenGL scene that include some bitmap text. It is my

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I am rendering an OpenGL scene that include some bitmap text. It is my understanding the order I draw things in will determine which items are on top.

However, my bitmap text, even though I draw it last, is not on top!

For instance, I am drawing:

1) Background
2) Buttons
3) Text

All at the same z depth. Buttons are above the background, but text is invisible. It I change the z depth of the text, I can see it, but I then have other problems.

I am using the bitmap text method from Nehe’s Tutorials.

How can I make the text visible without changing the z depth?

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1 Answer

  1. You can simply disable the z-test via 

      glDisable (GL_DEPTH_TEST);  // or something related..

    If you do so the Z of your text-primitives will be ignored. Primitives are drawn in the same order as your call the gl-functions.

    Another way would be to set some constant z-offset via glPolygonOffset (not recommended) or set the depth-compare mode to something like GL_LESS_EQUAL (the EQUAL is the important one). That makes sure that primitives drawn with the same depth are rendered ontop of each other.

    Hope that helps.

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