Surface tangent dPdu
The Surface Tangent dPdu node converts the surface tangent along the U axis (in world space) into an RGB texture (figure 2). It is typically used for anisotropy, directional shading, procedural orientation, and OSL calculations.
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Surface Tangent dPdu
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Figure 1: Surface Tangent dPdu Node
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Surface Tangent dPdu
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Figure 2: A Sample Tangent dPdu node example