Question

I am trying to do something basic with GL. However I got a problem with the lights. I have a cube in the viewport and when I put GL_LIGHT0 at some point, it shades the cube without any problem. But GL_LIGHT1 does not act normally. When I disable light0 and put GL_LIGHT1 at the same location of light0, it just gives a different color to the shape. No shading, no lighting.

What is the problem here?

Answer 1

The default values for GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR with GL_LIGHT0 is (1,1,1), while it is (0,0,0) for GL_LIGHT1 to GL_LIGHT6.

If you set these values using glLight*, you should see consistent behaviour.