Balcony fencing and window grilles

Balcony fencing, window and door grilles. R-railing of the balcony = 2300mm on the handrail, length 4300. ?Who works in the 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 older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward ? which is preferable for you. ?If the version of CORONA is higher than 1.4:? For Corona render, it is recommended to set the version to at least 1.5, since the glossiness of the materials is adjusted for PBR. ?