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This looks like the bottom layer of a volume texture that many games these days use to perform color correction. The idea is that the final RGB screen color, after rendering and tonemapping, is used as a texture coordinate to index into this texture, and the color found in the texture replaces the original color. This allows artists to arbitrarily modify ...


3

Applying two normal maps is not that bad. Many games apply multiple normal maps already because they're blending between texture layers (e.g. for terrain), so having a normal map representing the larger displacements and another normal map for fine details is pretty reasonable. Check out Blending in Detail by Colin Barré-Brisebois and Stephen Hill for a ...



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