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.



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!

  • $\begingroup$ Can you share your blend file? blend-exchange.com $\endgroup$
    – taiyo
    Oct 1 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
    Oct 1 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. $\endgroup$ Oct 1 at 21:46
  • 1
    $\begingroup$ try going into edit mode and pressing a to select all then m > Merge By Distance $\endgroup$ Oct 2 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
    Oct 2 at 6:52

1 Answer 1


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


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