Silicon Graphics

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(-) OpenGL Programming Guide
(-) Chapter 6Lighting
(-) The Mathematics of Lighting

Scaled Global Ambient Light

The second term is computed by multiplying the global ambient light (as defined by the GL_LIGHT_MODEL_AMBIENT parameter) by the material's ambient property (GL_AMBIENT's values as assigned with glMaterial*()):

ambientlight model * ambientmaterial

Each of the R, G, and B values for these two parameters are multiplied separately to compute the final RGB value for this term: (R1R2, G1G2, B1B2).

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OpenGL Programming Guide

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