thanks
Yeah, i used to export the 3dmodel and import it back into 3dsmax to get a reference. Then i would create whatever small object like a sphere to use it as a reference, and place it on the model to get XYZ coordinates without having to do trials&errors wich would simply be too much time consuming for adding lots of bubbles nodes.
I think I once posted on some thread to explain how i did it (to some extent...) somewhere...