This compound reduces the number of particles based on them being within a null icon's shape. The null must intersect with the emitter in order to emit particles.
Plug this compound's Execute on Emit output into an Execute on Emit port of the Emit compound or into a port on the ICETree node. If you do the latter, the emission is updated at each frame.
For more information, see Filtering Particles Based on a Null Object [ICE Particle Simulations].
Tasks: Particles/Emission Control
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