spawning particles on trigger from the surface of other instanced particles


Hi everybody!
I have a cloud of instanced particles, i am trying to make them 'spawn on trigger" other particles from the surface and not from their center.
can anyone give me any advice?


I still didn’t figured it out .
Does anyone know how to do it.
Actually,I find pretty wierd ,it isn’t an immediate option on the spawning node or under the “set instance geometry” node.
thanks anyways.


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