particle slide (isn't quite doing it 100%)

[demoan666]

hi everyone,

i am trying to slide particles in the inside of a geometry (a polygon box in this case) 

i want to get the particles freely slide along the walls (or even come on and off the walls because of the popattract force), which i managed to do with the two nodes popcollisiondetect and popproperty, however it doesn't quite slide... it goes past outside the box. especially if i increase the popforce amplitude.
to keep them sliding (and inside the box) i have to raise the "cling" in popproperty node to very high value which almost makes them look stick rather than slide.
However, a sphere instead of a box works fine.... the pighead somewhere in between the box and the sphere. anyone knows where i should tweak things?

FYI the settings for dopnetwork is same for all the three images (1a,1b,1c)

I would appreciate any help. 

PS: BTW how do i i make the quality of a simulation more precise (increase steps per frame) globally.

 

m.