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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 ...


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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