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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. High values may increase noise.


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.


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Transmit Specular Color

Specular color for the TT lobe.