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There are two choices of diffuse models: Zinke and Kajiya. By default, it is set to Zinke diffuse model which is for bidirectional scattering. See Importance Sampling for Physically-Based Hair Fiber Models.

 

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titleDiffuse Parameters

Diffuse Gain

This parameter is a multiplier to the Diffuse Color. 0.0 means no diffuse color while 1.0 is the full affect. The default is 0.0 which provides a very realistic dark to medium hair but with potentially higher rendering cost. You may need to use higher amounts for lighter hair like platinum blond or grey hair.

 

Diffuse Color

This is the diffuse color of the hair itself. Even for blond hair this is a darker shade than other color parameters for most realistic hair. For the best realism we recommend this be the same color as your Secondary Specular Color. The default is middle grey.

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