Anisotropic

Anisotropic simulates a surface with an asymmetrical specular highlight that changes when the surface rotates relative to the light sources. An anisotropic appearance has a “grain,” or directionality. This appearance is commonly used to simulate brushed finishes on metallic surfaces.

Parameters

Base Color Sets the color of the appearance in diffuse white light.
Highlight Color Sets the color of the appearance's specular highlights.
Roughness Controls the highlight size in reflected light. The rougher the appearance, the more it diffuses the highlight (the larger and less focused the highlight becomes).
Distortion Controls the amount of distortion by changing the Roughness ratio in one direction on the surface, versus the perpendicular direction. Zero causes no distortion, 100 causes maximum distortion.
Angle Sets the Distortion effect direction.