Arnold Diffuse Roughness Vs Specular Roughness

Specular map contains the colour of specular reflections. Normally with arnold 4, i would map the diffuse into the diffuse color, spec weight at 1, map spec roughness,.

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Add wetness look ( roughness 0) if i try to add some wetness to the ground, it has no effect due to this specular change. Press j to jump to the feed.

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Source: docs.arnoldrenderer.com

Little example for two students See, you cannot see any wetness on the floor.

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This thread what does the roughness setting on a diffuse shader do? Suggests a formula like this:

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The strength and size of specular reflections are determined by the roughness or glossiness of a surface, as previously stated. I believe you can use the inverse of those glossiness maps in the specular roughness slot of the aistandard shader.

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Little example for two students Specular map contains the colour of specular reflections.

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Diffuse_roughness=specular_roughness/3 but it also mentions that this formula was just. Its default value is 0.5, that is going to give you the non metal reflectivity (~4%).

Source: area.autodesk.com

Roughness map and specular map serves to different purposes. Diffuse_roughness=specular_roughness/3 but it also mentions that this formula was just.

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Roughness map and specular map serves to different purposes. I didn't know that backscattering was a synonymous for diffuse roughness.