     var metallic = i/num;
                    var roughness = j/num;
                    var len = colors.length;
                    colors.forEach(function(color, index){
                        material = new Hilo3d.PBRMaterial({
                            baseColor: new Hilo3d.Color(color[0], color[1], color[2]),
                            metallic: metallic,
                            roughness: roughness,
                            brdfLUT: brdfTexture,
                            diffuseEnvMap: 