Bathtub made of Stonex Raina material 159x79 cm Roca

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smoothing via TurboSmooth
there is no antialiasing in obj

Those who work in 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. Select Blinn, Phong or Ward - what is preferable for you.