Set for arched window 2000-2200 mm.
Arched curtains with goblet pleats with holdbacks on both sides and with trims, tulle for arched window.
The scene includes a simplified model of an arched window in the wall and a simplified model of a cornice for mounting.
The curtain set is grouped for convenience. In the export file, all objects are ungrouped.
The colors 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 a version no lower than 1.5, as the glossiness of the materials is set considering PBR.

If you are working in V-Ray version lower than 3.1, 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.