This is an improved version of the built in "normalmap" shader which also takes the roughness map into consideration. Here's how to use it: 1) Put the two files into C:\Users\username\Documents\makehuman\v1py3\data\shaders\glsl\ or wherever your data folder is. 2) Find a material that uses both "roughnessmapTexture" and "metallicmapTexture". 3) Copy both lines (but keep the originals) and add "shaderParam " in front of the new lines. 4) Make sure that the material has these lines: shininess 0.5 shader shaders/glsl/normalmap2 shaderParam litsphereTexture litspheres/skinmat_eye.png shaderConfig normal True shaderParam roughnessmapTexture blabla_roughness.png shaderParam metallicmapTexture blabla_metallic.png