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.
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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The bulk of your controls can be found under the Specular Parameters. Each of these relates in some way to the description below.
- Primary Specular: R is for "reflect" where light hits the surface of the hair and reflects. This is the strong primary colorless specular.
- Secondary Specular: TRT is for "transmit", "reflect", and "transmit" where light transmits through the hair surface, then it reflects from inside the hair and exits the front of the hair. This is the secondary colored specular.
- Transmit Specular: TT is for "transmit" and "transmit" where light transmits into the hair surface and then exits through the other side. This is the colored transmission that responds to rim lighting.