Texture : lookup table
texturing in 3 steps
The overall mapping is composed of a surface parameterization and a viewing projection.
texturing in five steps:
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Compute the object space location of the pixel to be textured.
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Use a projector function to determine the correct (u, v) texture coordinate.
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Use corresponder function(s) to find texel.
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Apply value transform function.
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Modify illumination equation value.
Texture coordinate generation
