No spot of light on cube

Question

I have made three sources of light and one cube

I don\'t see a spot of light on faces. It\'s look like entire polygon is lit. And i don\'t know is this posible and

Answer 1

Remember that the fixed-function lighting equation is only evaluated at the vertices of a triangle and interpolated across the fragment. No per-pixel lighting unless you get creative with GL_DOT3_RGB textures.

Therefore if you want to see a nice spotlight highlight on your cube you'll need to subdivide your cube faces so that they're closer to pixel-sized:

EDIT: Also remember to pass in reasonable per-vertex normals. Lighting doesn't work too well without them :)