Both models are grouped and signed dimensions are for rendering. Diffuse texture map by the integrated ColorCorrect and does not require third-party plug-ins. Change the color of the curtains is carried out in a couple of movements sliders. For translucent shtor- add on material Vray2SidedMtl, or use his method. Each stitched fabric curtains can be separated from each other and repainted in a unique color (selected polygons with an angular reference to 45 deg.)