Hi! Was playing around again, and was wondering, in chapter 24 the example project, there are trees and rocks etc as resources to render. These all have .mtl files. The files of the trees have a roughness an metallic property. But these each have three values per property? I only know these as single channel textures normally, so what would these other two values do?
roughness 1.0 1.0 1.0 metallic 1.0 1.0 1.0