Delete particles when they touch a certain object

[moniker 67]

If you have an object that's a house, car or whatever else where you can have an scene inside, and you have for instance rain or snow, you dont want the rain and snow to enter throught the ceiling... so it would be useful to have a way to delete the particles automatically as they hit the house/car so you don't have to resort o workarounds like adding particles to the sides of the windows. And in a moving car scene, it's impossible to have rain or snow particles in front of the car anyway, so this is a problem.