September 2018
Intermediate to advanced
472 pages
15h 36m
English
Content preview from OpenGL 4 Shading Language Cookbook - Third Edition
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Using a nonlocal viewer
We can avoid the extra normalization needed to compute the vector towards the viewer (v) by using a so-called nonlocal viewer. Instead of computing the direction toward the origin, we simply use the constant vector (0, 0, 1) for all vertices. Of course, it is not accurate, but in practice the visual results are very similar, often visually indistinguishable, saving us one normalization.
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