How could I set parameter's value, using attributes values?

[Masoud]

Hello;

In my “Attribute VOP” , I add a “Bind Export” node, called “HitDistance” attribute. (Actually, this attribute gives me the distanse of a geo to particles hit location). 

Now in my SHOP node, I would like to set the smoke intensity , using “HitDistance” attribute. Question is how could I access that value?

Thanks.
MSD.