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Microfacets or tiny bits of roughness can scatter light in a way that has a blurry result. The less rough, the mirror-like and smooth/slick the material may look. High values will simply look diffuse.
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Normal/Bump
Here is where you supply a signal, either a texture or procedural pattern, to create a bump to the surface to "fake" surface details like small bumps or scratches. This means an artist doesn't have to model these tedious and often repetitious parts of a model.
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How strong the reflection tail effect is as a linear measurement 0 to 1, or maximum strength
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Length
How rough/wide the effect is from none at all to 1 or to none with a negative value.
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