The context of this question: I am writing technical documentation in the field of computational science, i.e. simulating physical systems on the computer.
I am writing about a method, which takes in an existing mesh, creates the mirror image and joins the results. This way, if we have a symmetric problem, we need to create only half the geometry with our meshing tool, and we can then apply the mirroring operation.
What I want to know is the correct preposition for the following sentence:
"Mirror the geometry by(?) the user-provided plane"