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I'm trying to distribute geometry across a face to create a textured surface suitable for 3D printing.

I understand that Knife Project isn't available in geo nodes so I've tried boolean. I create instances and subtract them from the face and it gives inconsistent results (note the bottom left instance is correct but the others are not): Inconsistent difference results

All of the instances are positioned correctly: Edge view of instances in geo nodes viewer Isometric view of instances in geo nodes viewer

Any suggestions or alternative approaches? Thanks

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    $\begingroup$ Make sure all your hulls are manifold and you have safety margins: e.g. don't cut out a hole from a 1 m cube, using exactly 1 m long (deep) cylinder. Also make sure your entire node tree is visible when you share it... $\endgroup$
    – Markus von Broady
    Commented Jun 18 at 18:37
  • $\begingroup$ I added math nodes (not shown in the images) to eliminate all booleans at the edges, but that's not the issue. I wonder if boolean requires both operands to be manifold? The first is a single face and isn't manifold. I intend to use this to to decorate faces on a much larger object. $\endgroup$
    – Jay
    Commented Jun 18 at 20:26
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    $\begingroup$ I believe my thought about one operand being non manifold is the issue: "Only Manifold meshes are guaranteed to give proper results," $\endgroup$
    – Jay
    Commented Jun 18 at 20:31

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