“Who works with V-Ray version lower than 3.1 pay attention to materials section BRDF (Microfaset GTR (GGX)) if your version is older than 3.1 – this section will be empty and you have to choose: Blinn Ward or Phong d dependence on material “

“For Corona render it is recommended to install a version of at least 1.5 since the glossiness of materials is configured considering PBR”