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Do you know any way to efficiently reverse the convexity of this mesh to the outside? I mean the part created after the boolean operation. Thanks for the suggestions.

enter image description here

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enter image description here

Assuming the blue loops are lying flat in a plane, you can try the following:

  • create a face which which is lying in that said plane (select 3 vertices for example and right-click -> New Edge/Face from Vertices)

  • separate that face, create an Empty and snap that empty with snap options Face Project and Align Rotation to Target

  • separate your concave geometry and add a Mirror modifier to it, choose the empty as the mirror object and set the mirror options appropiatly, you should now see the convex geometry you want

  • apply, cleanup, join back

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  • $\begingroup$ Thanks for the suggestion. The presented situation is only an example, in other situations the shapes will be more complicated, so a mirror will unfortunately not work. I'm still looking for a way to simulate the mirror effect, but from the point of view of individual polygons - I don't know how understandable it is :) $\endgroup$
    – Zyzio
    Jul 12, 2023 at 18:21
  • $\begingroup$ I think i understand. You need a way for some kind of mirror surface which is not flat but bends along some set of to-be-mirrored polygon stripes. Maybe update or ask a new question with a concrete example showing the complication in detail. $\endgroup$
    – taiyo
    Jul 12, 2023 at 19:44

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