I'm trying to model some holes in a piece that must keep a smooth and round surface. At least also the edges of the holes must but be smooth. I tried different ways to do it but i'm to a deadlock. enter image description here

I did the holes with the bool tool but now i don't know how to smooth them because of the geometry that after the booltool is dirty. As you can see the shape is smooth but the holes are too sharp

enter image description here

This is the topology after the bool tool:

enter image description here I tryied with the looptools but i find 2 more issues: 1) I can't decide where to cut holes, but i must loop a circle just where i have faces enter image description here 2)when i extrude down the circle loops down, even if i bevel with many edges the shading is still wrong

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Someone know how could i solve this issue? Thanks in advance!

  • 1
    $\begingroup$ Hello :). Boolean operations usually require some manual retopology. Your topology isn't visible, please add an image of the mesh edit mode :). $\endgroup$ Apr 14, 2020 at 13:27
  • $\begingroup$ You probably need to apply smooth shading to the boolean object. $\endgroup$
    – stphnl329
    Apr 14, 2020 at 13:29
  • $\begingroup$ @jachym-michal, that's one of the hardest things to do in 3d modeling.. $\endgroup$
    – Sanbaldo
    Apr 14, 2020 at 14:48
  • $\begingroup$ Also check the LoopTool addon. I think that if you need to make some holes with a decent topology, it can really help you instead of using the boolean mod. Here some info: docs.blender.org/manual/en/dev/addons/mesh/looptools.html - here a youtube tutorial from Abbitt: youtube.com/watch?v=W2MjvKy1yCo $\endgroup$
    – Sanbaldo
    Apr 14, 2020 at 14:51
  • $\begingroup$ @stphnl329 Thanks i tryied but just the inner faces shades smooth and the edges of the circle they remain sharp. $\endgroup$
    – matibuc
    Apr 15, 2020 at 22:36

1 Answer 1


Use looptools and to fix your problems:

  1. decide where to cut: you can edit the typology of the mesh to have faces and edges where you want (for example you can select an edge and move it with G + G to move along the actual shape or you can add more edge loop to create the geometry for your hole). To create a good topology: select faces, loopTool > Circle, inset a little bit (I), extrude to create the hole (E).
  2. strange shading: you should use subdivision modifier to fix this (use 3 or 4).

p.s. you don't really need too many edges when you bevel:

enter image description here


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