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I found a weird problem - when applying a subdivision (in this case level 2, but it happens with any level) on the octagon, there is a strange pinching happening in two opposite corners.

Before:

Before:

And after:

And after:

Scale and rotation are applied if this could be related.

I'd really appreciate any tip on how to fix this!

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  • $\begingroup$ Can you share your blend file? blend-exchange.com $\endgroup$
    – taiyo
    Commented Oct 1, 2023 at 21:15
  • $\begingroup$ You should add more details about the way your mesh was made in order to get a better picture of your problem. add as many images and information as you can. the more the better. $\endgroup$
    – Emir
    Commented Oct 1, 2023 at 21:40
  • $\begingroup$ It is not strange as long as we don't know how you created it... things that could cause this: the edges there have a crease set, the edges are split there, duplicate vertices in this area etc. $\endgroup$
    – Gordon Brinkmann
    Commented Oct 1, 2023 at 21:46
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    $\begingroup$ try going into edit mode and pressing a to select all then m > Merge By Distance $\endgroup$
    – Harry McKenzie ♦
    Commented Oct 2, 2023 at 3:44
  • $\begingroup$ I can't reproduce the problem, so you must have overlapping vertices or inner faces, please share your file $\endgroup$
    – moonboots
    Commented Oct 2, 2023 at 6:52

1 Answer 1

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Face orientation was wrong, so I needed to recalculate normals. After that everything worked properly.

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