Curtain for an arched window 1500 mm with goblet pleat.
The scene includes a simplified model of an arched window in the wall and a simplified model of a cornice for mounting.
The color of the model can be changed in the material settings.

https://3dsky.org/collection/shared/5255126  collection of my curtains.

For Corona render, it is recommended to use version no lower than 1.5, as the glossiness of materials is set considering PBR.

If you are working in V-Ray version lower than 3.1, please be careful, in the materials section BRDF is set to Microfaset GTR (GGX), if your version is older, the BRDF field will be empty. Choose Blinn, Phong, or Ward – whichever is preferable for you.