Base#
The Base color of a surface before lighting calculations. Base represents only the pure color reflection of a surface, excluding lighting, shadows, or reflective properties.
Parameters
Display Name |
Name |
Type |
Default |
|---|---|---|---|
diffuse_reflection_weight |
float |
0.8 |
|
diffuse_reflection_color |
color |
1.0, 1.0, 1.0 |
|
diffuse_reflection_roughness |
float |
0.0 |
|
metalness |
float |
0.0 |
This layer models the base layer, a statistical mix between diffuse reflection and diffuse transmission components.
Weight
This parameter sets the weight of diffused reflection or metallic reflectance.
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Color
This parameter sets diffuse reflection color of the dielectric surface or reflectance value of metallic surface by the probability that light is reflected or transmitted for each wavelength.
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Diffuse Roughness
Oren-Nayar surface roughness coefficient, simulating view-dependent diffuse reflection. At 0.0, the surface behaves similarly to a fully Lambertian reflection. Higher values are suitable for powdery surfaces like dust, sand, dried clay, concrete, etc.
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Metalness
At 0.0, the material consists of a diffuse or transmissive base layer, with a specular reflection layer on top. When set to 1.0, the surface behaves like a metallic surface. For fully reflective metal, one can set the base weight and metalness to 1.0 and decrease specular reflection roughness to 0.0. Metalness values between 0.0 and 1.0 can create surfaces like oxidized copper when some surface areas are reflective, and some areas are not.
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The metallic reflection is modeled as a GGX microfacet conductor BRDF. The absorption coefficient and complex index of refraction are computed from the base color and the specular reflection color. The base color controls the metallic surface appearance, and specular reflection weight and specular reflection color parameters only affect the edge tint.
See Thin Film section for more information.
