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Roughness

Roughness controls the spread of microfacet reflections, from sharp polished highlights to broad matte reflections.

Example​

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Configure the material​

The following fields update an existing PBR material; see Materials guide.

material.setProps({
  pbrMaterial: {
    metallicRoughnessValues: [0, 0.6]
  }
});

Parameters and textures​

The second component of metallicRoughnessValues is roughness, in [0, 1], with a default of 1. It is multiplied by the green channel of the linear metallic-roughness texture. Low roughness needs a useful light or environment reflection to remain visible. Roughness does not blur geometry or replace normal mapping.

Model integration​

Uniform updates do not add shader features or texture resources. The glTF converter supplies the matching defines and bindings when importing these material inputs.

See Textures and UV coordinates for binding names, map enablement, and color handling.