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I was messing around with fluid simulations, and I noticed that if I rotate the domain, the direction of gravity rotates with the z axis of the domain. Can I make it so that gravity is always pointing in -z, and not -z relative to the domain?

I know I can calculate gravity for each direction and set that in the options of the domain, but I'm too lazy for that :/

file: https://easyupload.io/51rm22

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    $\begingroup$ i am pretty sure that you shouldn't rotate the domain and that it doesn't make what you hope it should make. The domain shouldn't be moved at all. If you want such an effect, make an effector in your domain, fill in a fluid in that effector and rotate that effector. The domain is just a theoretical construct, it is not a "real time" object like an effector. It is just the bounds of your simulation. Not more and not less. $\endgroup$
    – Chris
    Commented Mar 19, 2022 at 12:08

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Yes ... transforming domain's rotation calculates sim gravity in Local Z axis. Hard to say if it is for result stability (avoid some issues or glitches) or missing feature. Anyway you can set gravity global for domain like this ...

  • For Domain > Field Weigths > Gravity set zero
  • Add Empty > Force Field > Shape-Plane > Force and set Strenght -9.81

enter image description here

Note: In another post here I had to specify Domain > Field Weights > set Collection at some point to make it work, but when later deleted it worked as well. So probably some file specific issue.

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  • $\begingroup$ Nice solution !!! $\endgroup$
    – Chris
    Commented Mar 21, 2022 at 7:07

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