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Randomly duplicating geometry during a RBD simulation


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Hi all,

I posted this at the sidefx forum, but have had no replies and I'm really stuck :( ...
 
I've got a quite simple RBD simulation with a bunch of spheres falling down. 
What I'm trying to do is have those spheres randomly duplicate and nicely push apart at some point in the simulation and I'm really quite stuck :/ 
 
tried something earlier yesterday and sort of got what I was after...but I've tried to duplicate it in a simpler scene and it just wont happen. This is becoming really frustrating. 
I've attached my scene and hopefully the notes will explain my method, but just in case it doesn't, basically I've set up a SOP node branch after the dopimport1 to take the simulation and randomly select one of the spheres and then feed those all back into the dopimport1 node.
The file should make things easier to understand. 
 
I'm guessing there's some specific DOP nodes to copy geometry or something? I dunno.
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