who works with V-Ray version lower than 3.1, pay attention to material section BRDF (microfaset GTR (GGX)), 3.1 - this section be empty, and you have to choose: Blinn, Ward or Phong, d dependece on materials.

for Corona render, it is "recommended to install a version of at least 1.5, since the glossiness of materials is". configured considering PBR

format: 3Dmax + FBX + OBJ
render: V-Ray + corona