ysvry: I tried Minnaert, Oren-Nayar and Lambert diffuse and WardIso, Phong, Blinn and Cook-Torr speculars. To be honest I saw only very moderate differences. Now it is Minnaert diffuse and Blinn specular. They seem slightly better than previous ones, but the material is still not very close to a good chrome. Looking fwd your replies...