If using export formats, apply TurboSmoth with 2-3 iterations.
Who works in V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is lower than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which is preferable for you
Native Formats: MAX (Autodesk 3ds Max, filesize: 28.2 MB)
Exchange Formats: OBJ (OBJ, filesize: 12.2 MB), FBX (Autodesk FBX, filesize: 41.8 MB), MAX (Autodesk 3ds Max, filesize: 28.2 MB), 3DS (3D Studio, filesize: 3.18 MB), TEXTURES (Textures, filesize: 52.8 MB), JPG (JPG, filesize: 2.2 MB), STL (Stereolithography, filesize: 10.3 MB)