The Hair BSDF node is used to add shading for Hair.
- Color of the hair.
- Controls the way the light is rotated (angular shift) for the reflection/transmission.
- Roughness U/V
- Controls the roughness in the direction light is skewed, and perpendicular to it.
- Input tangent.
There are two components that can be used to control the look of the hair. Usually you are going to want each of these and use a Mix Node.
- The light that bounces off the surface of the hair.
- The light that passes through the hair and comes out the other side.
- Standard shader output.