Here is a quick test of OpenGL I did while I was in school.
1 : Shows the cubes and sphere scene
2 : Shows the (incomplete) solar system scene
3 : Shows the satellites scene
Z : Zoom in
D : Zoom out
R : Camera position and zoom reset
F : Shows/hides the fog
T : Starts/stops the solar system / satellites rotations
L : Shows/hides the objects' rotation path
Up, Down, Left and Right : Light source movement
I : Sets the light source position relative to the camera (default)
M : Sets the light source position relative to the scene
Q or Echap : Quits the program