Roughness

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Material Editor > Standard material > Multi-Layer or Oren-Nayar-Blinn Basic Parameters rollout > Advanced Diffuse group (unlabeled for Multi-Layer)

Roughness controls how quickly the diffuse component blends into the ambient component.

Note: The Roughness parameter is available only with the Oren-Nayar-Blinn and Multi-Level shaders, and with the Arch & Design material (mental ray).

Increasing the blending area between diffuse and ambient with Roughness

Procedure

To adjust the roughness:

Change the value of Roughness.

Increasing roughness makes the material have a flatter, more matte appearance.

Interface

Roughness—As you increase this value, the matte appearance of the material increases. It also grows darker and appears more flat. At 0, the roughness is the same as it is with Blinn shading. Default=50.

Click the map button to assign a map to Roughness. This button is a shortcut: you can also assign Diffuse Roughness mapping in the Maps rollout. See Diffuse Roughness Mapping.