Corona version 9 The model uses materials that may not be displayed correctly in very old versions of the engine. Selfreflect mirrors from Anton Hendrik Denys in three sizes: 1250*30*1250 mm 1000*25*1000 mm 650*18*650 mm http://www.antonhendrikdenys.com/selfreflect-2018-_-a-mirror-collection/11bwnjderjjz3o48d375rp9edht4q2 The objects are unified, textures and materials have logical names For Corona render, it is recommended to install a version not lower than 1.5, since the glossiness of materials is configured with PBR in mind. Who works in a V-Ray version lower than 3.1 be careful, in the 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