...
Roughness Along
Roughness Around
White Hair
This parameter controls the amount of white hairs in the clump of hair.
Medulla
Synthetic Fiber
...
Natural looking hair requires a slightly different variations from one hair strand to the next (having totally uniform parametrisation over the entire hair clump is generally only possible for synthetic hairs). The values in this section allow to randomly vary most parameters by a certain amount. Note that the variation is coherent from frame to frame in animation. A value of 0 indicates no variation for the parameter, a value of 1 indicates the largest possible variation and will be closer to a totally random value.
Dye Hue Variation
White Hair
This parameter controls the amount of white hairs in the clump of hair.
Technical Notes
...