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How to mirror geometry along Z normal of Reflection Plane? (When Local coordinates of geometry nodes modifier similar to global)

Like on the picture, but with geo nodes

enter image description here

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So here is a node setup which mirrors: (sorry, but just mirrors)

enter image description here

i found this answer here: https://math.stackexchange.com/questions/13261/how-to-get-a-reflection-vector

and so i called my variables n and d

result:

enter image description here

by changing n you influence the mirroring (or the angle of the mirror)

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