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I accidently found that Bevel modifier with weight option somehow improves n-gon after subsurfing, but don't understand what does it actually do. There is no real bevel weight applied to the edge.

Decimate modifier draws same amount of faces either Bevel is turn or off. Normals also behave similiar, but shading is smoother. enter image description here

File to play with:

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  • $\begingroup$ It maybe a problem caused by the non correct update of vertex normals. By the way it's not strictly related to the Bevel modifier, you can for example force the update by switching to edit mode (i.stack.imgur.com/ujZZF.gif) or use another modifier that interact with the faces (wireframe, simple deform with zero factor, triangulate...) $\endgroup$
    – Carlo
    Jun 22, 2017 at 18:02
  • $\begingroup$ Can you check whether in the Mesh Tab under Normals "Auto Smoothing" is active? $\endgroup$
    – Ben
    Feb 5, 2019 at 0:22
  • $\begingroup$ Auto Smooth is "Off" $\endgroup$
    – Serge L
    Feb 5, 2019 at 10:43
  • $\begingroup$ I think Carlo is right, I played with that creased edge that you have around the top and when I push its crease value back to -1, it behaves like it should at 0. My guess is, that somewhere along the way, these value get overwritten. $\endgroup$
    – Ben
    Feb 20, 2019 at 13:20

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