Everything you've always wanted to know about normal maps but were afraid to ask
Jul 28, 2011 by Paul Roberts
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Inconsistent implementation of normal mapping algorithms is a headache for games artists and a subject of much debate. Jean-Francois Yelle has written a helpful article clarifying the differences between DCC applications, and a white paper to help ensure that normal maps display consistently in 3DS Max and your game engine. More at Into the Pixels.