Roughness

It is considered to be removed. Please use Directive instead

sets roughness for the current material

Roughness[i_Real]

where i is in the range of 0 and 1.

Examples

rough material

Graphics3D[{White, Roughness[1], Sphere[], PointLight[Red, {-1,-3,3}]}]

polished

Graphics3D[{White, Roughness[0], Sphere[], PointLight[Red, {-1,-3,3}]}]