Advanced OpenGL Lighting

Color-material mode

Allows material values to be changed by glColor

glEnable(GL_COLOR_MATERIAL); glColorMaterial function

Secondary specular color

Specularity is added in after texture mapping

glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR)

Rescaling normals

glScale can affect normals adversely

glEnable(GL_NORMALIZE) or glEnable(GL_RESCALE_NORMAL)