How to create a static background image in an OpenGL scene (GLUT)?

Question

I am creating a scene, and I would like to show some static background image that would not change from how and what I do with the scene.

Answer 1

This usually means that you can skip clearing your color buffer at the beginning of the scene, instead you will set the default spelling projection and render the quad with (-1, -1,0), (-1, + 1,0), (+ 1, + 1.0), (+ 1, -1.0) and apply texture to this square.

Then you can set up the necessary perspective projection and display everything you want in your scene. The square will serve as your background.