Maybe you could use 'Push" values? Do particles have a modifiable PUSH?

Also, I think the AUM has a tutorial on not having snow inside, but still seeing it through the windows..

------------------
"Dare to Do, what others Dare to Dream..."

Currently Recruiting for a Commercial CRPG Project based on a Published Pen & Paper Game:
www.talislanta.com
www.tamerlin.com
www.talislanta.com/talislanta/images/talpromo-56.ram
See our thread in 'User Projects' Forum