particle collision hack

Just read this on the highend mailing list,  and can’t take credit for it, but wanted to spread the word.

if you ever have a need to   have a particle collide  with a surface but not  be affected by the collision

you set the  collision  “resiliance” to  -1   or a range of  anywhere between -1 and 0  and  the particlers

will just continue  straight on thru and register a proper collision event.

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