Fabric Shader Overview

Yarn-based Cloth Shader : (aka) micro-fiber based BRDF : micro-fibers orientation returns correct physically-based macro specular highlights, suitable for both close-ups and distant views.

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Automagic color shifting, normal/bumps simulated with specular roughness for improved detail and consistency. Here we see also fiber fuzziness in action.

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Procedural weaving pattern support via WIFs (Weaving Information Files) files.

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Hanrahan-Krueger to simulate additional diffuse scattering  (the fabric model itself uses an ad-hoc phase function to describe the scattering inside the yarn and to simulate the way light interacts with fibers).

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