I did a hole in my mesh in Blender 2.82 with boolean modifier, and I made some changes about topology so that the subdivision surface modifier can work properly. I removed all the doubles, and I checked the normals, they are fine.

image 1

But the result isn't what I've expected. We can see a bump, right below the hole (in red on the image).

image 2

Does someone have any idea ? I don't have any problem when I do the same thing on a sphere. Thank You !


1 Answer 1


This is the kind of topology you need. It has ring-based loops of quads going around the hole.

enter image description here

It produces a rim with no bumps when you add your Subdivision Surface modifier.

enter image description here

  • $\begingroup$ It works ! Thank you very much for taking the time to help me. $\endgroup$
    – Axel
    Jun 4, 2020 at 9:25

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