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Create traveling 'source' for POP grains?


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Hi - in an effort to expedite the simulation process, I was wondering if there was a way to indicate to Houdini which 'section' of a grain source is active at any moment. For example, picture a long flat cube which is a snowy trail for some skis - I only want Houdini to calculate the area through which the skis are traveling at that moment, rather than computing every snow grain on every frame.  Is there a way to do this?


(Or maybe it's already doing this?)




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