Translucency Headache

Hi everyone, just wanted to ask about vray for sketchup translucency. I made a roman blind model, however when I tried the instruction for translucent materials found in the vray manual the result is confusing. I do get some translucence in my material, however it seems that it is not true to what I was expecting.


Here's the result I got. The middle part of the curtain is darker than the edges... Diba dapat the farther the edges are in a translucent material the lighter it becomes. Here's a reference pic I'm trying to imitate.



Here is the material setting I have.


I used that for the vray2sidedmaterial as front and back material.

Hope you can enlighten me on this, thanks!