Vray2Sided render problem

[raistlin]

Hi! Is there a problem with Vray2Sided?

I've take the Confetti explosion tutorial and remade it.
I'd like to render with a Vray2Sided material and for a reason i don't Know...
It doesn't done it...

Here is the shader 
https://www.dropbox.com/s/ehdz8xccx8z8bk...s.jpg?dl=0

And here the result, with a simple twist plane as reference with the SAME shader...
PArticles don't displays the same result as the big plane...
https://www.dropbox.com/s/0bpqmel6d1jfpp...m.jpg?dl=0




It don't render on a multimaterial...
Thanx!