Set for narrow arched windows 1000 mm.
Arched curtains with goblet pleat, one tieback for each full curtain. Tulle for arched cornice.
The scene includes a simplified model of an arched window in the wall and a simplified model of the cornice for example display of the mounting.
The set of curtains 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 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 under the BRDF section is Microfaset GTR (GGX), if your version is older, the BRDF field will be empty. Choose Blinn, Phong, or Ward – whichever is preferable for you.