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FLIP, how to use the MASK tap to limit field area

Hi everyone,

The key parameter is "add Curl Noise" in "Fluid Source" Node, my custom vortex velocity field is made of Stamp Points from a volume of tube, so the velocity field is a tube shape, after adding curl noise, the field turns to a cube shape.

My idea is making a Stamp Points density field (tube shape) to MASK the cube shape, but how to do it?





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