September 2018
Intermediate to advanced
472 pages
15h 36m
English
Content preview from OpenGL 4 Shading Language Cookbook - Third Edition
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There is a slight efficiency gain when using directional lights, due to the fact that there is no need to recompute the light direction for each vertex. This saves a subtraction operation, which is a small gain but could accumulate when there are several lights or when the lighting is computed per-fragment.
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