Here is some scan data I put in a spreadsheet when I was writing the Marmoset PBR tutorial: https://docs.google.com/spreadsheet/ccc?key=0AlSRuM7BFhPVdGV4OXRETlYwYVVqbkp6aDNwYm1XaHc&usp=sharing#gid=0 Data is pulled from Quixel Megascans content Reflectivity in SRGB and linear space, roughness/gloss in SRGB and linear space,…