Thanks for reply, but I'm searching more traditional curtains, that look like the curtain on the free 3D models page.
And I don't think I will find it, because I computed the file of a such model should be very big, because of the high number of strings, each string being divided into a lot of little parts in order to make the waves and a natural shape.
So I decided to make a little program in C language, that create a .obj file to store a very basic curtain, usable to do some tests, because I'm not a good 3D graphist.
For a realistic number of strings, and a size of 60 cm on 140 cm, the .obj file generated takes around 400 MB unzipped and 41 MB zipped, but smaller models of around 100 MB can be generated for tests.
When I illuminate a room placing a light panel behind these curtains, the lighting of the room and the shadows are very ugly. The following picture compares the lighting with the two curtain models:
So it seems the renderer have difficulties to compute a good lighting and the shadows when the light go trough a lot of little holes.
In the tests I have done, if the string curtains take big files and a lot of memory, they however was rendered faster than those made of transparent surfaces.
