Preset – Offers some commonly used hair settings as presets. You can choose between White, White (Fur), Sandy Blond, Golden Blond, Light Brown, Dark Brown, Aged Dark Brown, Ginger Red, Auburn, Scarlet Red(Dyed), Atlantic Blue (Dyed), Lagoon Blue (Dyed), Black presets. See the Presets example below for comparison.
Melanin – The pigmentation component that gives the hair strand its main color. The higher the value assigned, the higher the concentration of melanin and the darker the hair strands are.See the Melanin examplebelow to understand how different values work.
Pheomelanin – The redness (pheomelanin content) of the hair strand as fraction of all melanin. 1.0 makes the hair redder. The ratio of melanin to pheomelanin determines how red the hair is. The Pheomelanin value will have no effect if the Melanin is set to 0. See the Pheomelanin example below.
Dye color – Applies a color tint to the hair. For a dyed hair look, set the Melanin to 0, otherwise the melanin darkens the dye color and pheomelanin introduces redness to it. White means no hair dye. See the Dye color examplebelow.
Opacity – Controls the opacity of hair. White is fully opaque, while black is fully transparent.
Diffuse color – Controls the diffuse component of the shader. Use this for materials made out of cloth threads or other non-translucent fibers, as well as for dirty hair.
Diffuse amount – Specifies the amount for the diffuse component of the material.
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Note that real-world hair or fur does not have a diffuse component. Although the diffuse parameter allows for some artistic control, for realistic results it is best to disable it by leaving the Diffuse amount at 0.
Glossiness – Controls the glossiness along the hair strand. It primarily controls the width of the highlight, essentially how shiny the hair appears.
Primary glossiness boost – Additional scaling factor to boost the primary reflection glossiness. This can be useful for reproducing the effect of shiny coating on rough looking fur.
Softness – Controls the overall softness of the hair by how much the highlights are wrapped around the individual hair strands. Higher values make the highlights wrap almost completely around the strands giving the hair a smoother look, while lower values make the it look crispercrispier. See the Softness examplebelow.
Highlight shift– Shifts the highlights along the hair strand. Positive values shift the highlight away from the root of the hair, while negative values move the highlight closer to the root. Values in the range 2-4 are typical for human hair. See the Highlight shift example below.
IOR – Hair index of refraction. The typical value for human hair is 1.55. The higher the value, the more reflective the hair strands. See the IOR example below.
