A simple OSL node calculates tangent space for anisotropic materials.
Since there is no good tool to generate texture with negative color, a remap from [0, 1] to [-1, 1] may be needed to get negative direction.
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An OSL node to calculate tangent space for anisotropic material.
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conceptfarm/oslShader
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An OSL node to calculate tangent space for anisotropic material.
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