[Closed] pflow particle collision

Hi there,

I have a basic pflow scene with a sphere and particles raining downing and colliding with the sphere where they stop and move onto the next event. I am wondering if there is a way to then move the particles along the surface of the object they hit. As a general rule for my simulation I want them to move in the negative Z direction, so basically I want them to slide down my object until they reach its bottom and drop off. I realise that pflow tools might enable me to do this, but I would like to attempt this in MAXScript if possible. Bobo I emailled you about this not long ago, thought I might be able to find some more hints on here. I am guessing i need to effect the vector of each particle, maybe if I could move each particle down and then project it out onto the surface of the object, that may work but would not be very accurate.

Again, I am not spending alot of time on this, just an idea i want to test out on the side of my work. Let me know if you have any ideas?

Thanks,

Nathan