Roughness = affects how sharp/tight or blurred/diffused the highlights are. Water is not rough, so would be indicated by very dark values in the map and the highlights would be sharp and appear bright. Dry wood would be rough so have values near white and the highlights would be so blurred and diffused across the surface that it appears dull. Note that this does not have anything to do with the amount of light reflected though, that remains the same.

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Not approved by Scarfolk Council. For more information please reread. Or visit my local shop.