Geometry:
Who works in the V-Ray version lower than 3.1, be careful, in some materials in the BRDF section there is a 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. 3dsMax 2015 + Obj (Vray)