Lighting Basics

You can think of lighting as a way of automatically computing per-vertex colors
Based on how geometry would look under a certain light source
Pays attention to the normals to the surface. This means that to get smooth shading, you must give a different normal for each vertex.
"Shading" normals need not be true "geometric" normals - they are often an average of the normals of adjacent triangles.
OpenGL lighting is "local" - it considers only direct illumination, not shadowing or interreflection of light
To do lighting: set up a light source, set up materials, specify geometry with normals