Cottage is a classic style in modern processing.
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The indicators of the curves in the Falloff maps in formats in FBX and OBJ are not exported.
Who works in the V-Ray version is lower than 3.1. Be careful, the materials in the BRDF section are 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.