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I've almost gotten the effect I want but I'm stumped on how to take it that last 25% of the way. I've created a torus that scales up, emits smoke, then scales back down...I'm attempting to create a suction effect so as the torus scales down the smoke gets sucked into the center. After reading some other forum posts about reverse expansion I tried setting that up and it's kind of working....however the suction doesn't seem to be following the velocity caused by the scaling of the torus. I tried doing some sort of setup within a volume vop but I'm hitting a wall on how to get that velocity to be taken into consideration by my expansion. Thanks for taking a look! smoke_suction.hip
