The Redoute
Ref 2531041 / GMI298
A fabric that breathes like a delicate breeze... Sylva delicately veils a window while letting the light pass through its openwork weave.
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https://www.laredoute.co.uk/ppdp/prod-350305040.aspx#shoppingtool=search 
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Corona render 9
Corona legacy mtl
The curtain is assigned turbosmooth only for rendering. For distant angles, you can remove it. FBX file without turbosmooth to avoid errors (add if necessary).