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I have a simple sphere. Half of it has an anisotropic BSDF material, the other half has a Principled BSDF material with anisotropy. I believe I have the same settings for the two materials, but they render differently. How do I get the materials to match?

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It looks like if you play a bit with the Principled settings you get about the same result. I can't tell you more as I don't know anything about anisotropy ;)

enter image description here

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The manual section on the Principled Node says

Compared to the Anisotropic BSDF node, the direction of highlight elongation is rotated by 90°. Add 0.25 to the value to correct.

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