Thanks for the suggestion Jim but I can’t get that to do what I’m after.
I have a stream of TPs and I want some of them to be attracted ( and finally stick) to a polygon helix that is surrounding the beam The remaining particles go on and stick to another polygon object which has a TPdeflector with bounce set to zero. I’m using c4d R13 and haven’t done very much in it for a number of years now so am very rusty with it.
XdcamEx & HD, C300, DSLRs, all sorts of production & post gear and a very untidy desk. On the East Coast of the UK