Are there any good particle includes/macros besides the ones by
Colefax?  I'm kind of hoping there's one out there that can handle
collision detection against any object, be it using trace() or
whatever.  What I need is something very basic - particles emitting from
an area and falling straight down like rain.  While it would be cool for
them to bounce off objects, I could just have them die on contact.

Anyway, the particles themselves are easy enough to make, but how can I
tell if one has hit an object between frames?  Better yet, maybe someone
has already done it.

Help!!! ;)

-Mike

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