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

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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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