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Pyro: Loosing Velocity in sim?


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I have a pyro sim where I add a preroll velocity noise, my goal is to make density move quickly once it's injected in the simulation (i.e. I don't want to wait couple frames before I see density moving, note: density has a velocity field as well, but it takes also couple frames to move the smoke). Anyways, something I've noticed, when I add the pre-roll velocity noise field, it modifies the sim velocity field then quickly die or damped? is this normal? 


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