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how to group smoke to apply separate forces


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I want part of my simulated smoke to accept a force that the other parts should ignore, but I am not sure where to start.

I considered creating a new volume field similar to density, and advecting that (which i am also not sure how to do), similarly to how the pyro solver allows you to control certain shaping parameters with a field.

But these are only guesses so far.

The force I want to specifically apply is being pipped in as a fieldforce, which a volume for is being crated in sops.

Any nudge in the right direction will be greatly appreciated.

Thanks.

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