Manufacturer Website: http://www.giovannibarbieri.com/details/triface-2 

Who works in the V-Ray version lower than 3.1 be careful in some materials in the BRDF section there is Microfaset GTR (GGX) if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you.