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subtract collisions particle fluid surface

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hello, I am trying to use the subtract collision volumes on the particle fluid surface node to make my water inside a sphere fit inside. So I converted a sphere to a sdf and used that as the collision. As you can see in the second photo, it deleted the inside, but I want everything on the outside deleted. So I attached a volume wrangle inverting the sdf, but that still didnt work. I am confused why inverting the sdf would not work.

thanks in advance



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