So often when I need to mirror something, I'll have two bodies, and need to mirror an object from the first body to the second body. To do this, I select midplane, and get a plane in-between the two bodies, and mirror the object across that plane. What I would love, however, is to be able to select the two planes while in the mirror dialogue, and it generate the midplane between them, without the need for creating a midplane first.
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