Other models of curtains: https://3dsky.org/collection/shared/5455252 

The archive contains the 3ds max 2018 scene for Corona and V-Ray + fbx files.

The renderers for the previews are made in Corona Render 9. On the Corona Legacy Mtl model. A version of Corona Render at least 1.5 is required. The conversion of materials to V-Ray is performed using V-Ray scene converter.

Poly: 67 846
Verts: 69 311

Attention (!) the Roman curtain has not been worked out in detail (lace, fasteners). It is not suitable for detailed closets.

In the model: long curtains, tulle, Roman curtain.

All my models are optimized, made for smoothing (where it is needed). They don't have unnecessary geometry or unnecessarily heavy maps. All archives are as light as possible without loss of quality. All objects and materials are logically named.

"For Corona Render: it is recommended to install a version not lower than 1.5, since the glossiness of the materials is configured with PBR in mind.

If you work in a V-Ray version lower than 3.1, be careful. In the materials in the BRDF section, there is a Microfaset GTR( GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward, whichever is preferable for you."