Corona 9

Those who work in V-Ray versions lower than 3.1 be careful, the materials in the BRDF section contain 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

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.