Those who work on V-Ray versions below 3.1, be careful. Microfaset GTR is installed in the materials of the BRDF section, if the version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward — whichever is more convenient for you...Manufacturer's website: https://www.reggiani.net/projectors/family/yori-ip66