Sheen 

An energy-conserving sheen layer that can be used to approximate microfiber, cloth-like surfaces such as velvet and satin of varying roughness. Sheen is layered onto the diffuse component and its weight is determined with this attribute. Sheen can be thought of as the density or the combination of the density and length of the fibers.

0 (default)
0.5
1

Sheen Color

The color of the fibers. Tints the color of the sheen contribution.

Red
Green
Blue

Sheen Roughness

This modulates how much the microfibers diverge from the surface normal direction.

0
0.3 (default)
1

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