OpenGL Programming Guide (Addison-Wesley Publishing Company)

normalized: Divide each of the components of a normal by the square root of the sum of their squares. Then, if the normal is thought of as a vector from the origin to the point (nx', ny', nz'), this vector has unit length.; factor = sqrt(nx2 + ny2 + nz2); nx' = nx / factor; ny' = ny / factor; nz' = nz / factor

OpenGL Programming Guide

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