More curtain models:
https://3dsky.org/collection/shared/5249944 

Linen curtains with Roman blinds
Thick and light-transmitting linen in two light natural shades

3dsmax 2013 and FBX file with Vray materials
3dsmax 2013 and FBX file with Corona materials
Preview materials from Corona
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For Vray versions below 3.1 some materials may not be displayed in MatEditor and during rendering. To fix this set the value to Blinn in the BRDF section.