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Crazy Bump was never open source, but the author released version 1.2.3 as freeware before abandoning the project. Distribution of this final free version is generally considered abandonware. However: crazy bump download
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A Normal Map is a special texture that uses RGB values to simulate the direction of surface normals. In plain English: it tricks the game engine or render engine into thinking a flat surface has bumps, grooves, and scratches.
: Control how light "shines" off different parts of a surface.