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  • 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.

 

 

 Primary Specular Gain

Gain for the R lobe of Marschner specular. This is like a clearcoat where the specular is fairly sharp and glossy and normally not colored. This specular is a direct reflection which is not tinted by any volume attenuation. Modifications of the R lobe help to make a hair look "wet" as well.

 

Secondary Specular Gain

Gain for the TRT lobe of Marschner specular. This is a rougher and colored specular. This goes through the hair fiber volume twice.


Transmit Specular Gain

Gain for the TT lobe of Marschner specular. This is a transmission-type (refraction) specular with some volume attenuation. It goes through the fiber volume once.


Glint Gain

Gain for glints.


Primary Specular Color

Specular color for tinting the Primary Specular (the R lobe).


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Secondary Specular Color

Specular color for the TRT and glints lobes.

Because it represents two paths inside the hair fiber, it should be darker and more saturated than the Transmit Specular Color which technically is the square root of the Secondary Specular Color. For more realistic hair this should match with the Diffuse Color.


Transmit Specular Color

Specular color for the TT lobe.