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Gas Advect velocity with no divergence preservation

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Wondering why when the an incoming velocity field to a dop simulation doesn't "move" while being self advected unless there is a project non-divergent in the sim. In a barebone smoke sim, I can advect incoming scalar fields using a velocity filed imported from SOPs, but when I try to advect the velocity field by itself, the velocity field doesn't seem to move inside the smoke object container. 




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