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The Diffuse rollout is part of the Generic material's parameters.

Diffuse

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Column width 60% Some options are available only in Advanced mode. Color – Specifies the color of the material. For dielectric materials, this is the diffuse color. For metals, this is the specular reflections color. Diffuse Roughness – Controls the Diffuse BRDF Falloff. It can be used to simulate rough surfaces or surfaces covered with dust (for example, skin or the surface of the moon). Note that this parameter only affects the diffuse portion of non-metallic materials. For more information, please see the Roughness Parameter example below. Column width 5%   Column width 35%

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This example demonstrates the effect of the  Roughness  parameterparameter. Note how, as the  Roughness  increasesincreases, the materials appears appear more "flat" and dusty.

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border true
Column width 30%   Column width 40% Image slider Panel borderStyle none Roughness = 0.0 (regular diffuse material) Panel borderStyle none Roughness = 0.3 Panel borderStyle none Roughness = 0.6 Panel borderStyle none Roughness = 0.8 Column width 30%

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