Parameters

The Parameters sub-section can be used to define the direction of the hair, setting the base color strength, the reflection and SSS effects on the hair.

Basic Settings

• Tangent Vector Color: If you do not load any customized Hair Tangent Map, then the system uses this color to determine the direction of the entire hair texture.
• Flip Tangent Map Y: This checkbox can be used to swap the primary and secondary specularity position on the hair.

  Flip Tangent Map Y = Off	Flip Tangent Map Y = On

• AO map occlude all lighting: Instead of merely occluding the IBL effect, AO map can be used to occlude all lights in the project by activating this checkbox.
• Diffuse Strength: Use this slider to set the strength of the Base Color texture without actually changing the original image.

  Diffuse Strength = 0.800	Diffuse Strength = 2.000

• Hair Roughness Map Strength: This value set the roughness strength of the hair.

  Hair Roughness Map Strength = 0.555	Hair Roughness Map Strength = 0.777

• Hair Specular Map Strength: This setting adjusts the overall strength of the Specular Map.

  Hair Specular Map Strength = 1.000	Hair Specular Map Strength = 0.300

• Specular Strength:

  Specular Strength = 1.000	Specular Strength = 1.500

• Indirect Specular Strength

  Indirect Specular Strength = 0.000	Indirect Specular Strength = 2.000

• Transmission Strength: This value defines how much light is to pass through a hair.

  Transmission Strength = 1.000	Transmission Strength = 1.500

• Lit Back Face: This setting keeps the details of the dark areas of the hair in PBR shader.

  Darkness in PBR shader
  Lit Back Face = 0.000 (Digital Human Hair Shader)	Lit Back Face = 1.000 (Digital Human Hair Shader)