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I'm trying to get a smooth circular shape on a cylinder. Each time I increase the loop cuts, starting from 16 vertices, all the way to 40. The one with 40 vertices is more smooth but again not so perfect. At the same time I also don't want to increase the vertices count to begin with the cylinder having 64, so what's the correct or best method to get a better result.

enter image description here

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It's not clear why you're not glad with your solutions and also you show a variety of cylinder radius so it's not clear what is the one you're trying to achieve. But you can try this way:

First create a high resolution cylinder, like 128, scale it on Z, give it a name like "Shrink" and hide it:

enter image description here

Now create a 16 vertex cylinder, cut 3 horizontal loops, cut a hole, give it a Shrinkwrap modifier with the first cylinder as Target:

enter image description here

Select the hole edge loop and right click > LoopTools > Circle. The circle will stick to a cylinder shape, thanks to the modifier, apply the modifier:

enter image description here

Extrude, fill the faces, bevel the edges:

enter image description here

Give it a Subdivision Surface modifier, shade smooth:

enter image description here

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  • $\begingroup$ +1 the modelling master strikes back again... $\endgroup$
    – Chris
    Nov 13, 2022 at 11:20
  • $\begingroup$ with my hammer this time $\endgroup$
    – moonboots
    Nov 13, 2022 at 11:24
  • $\begingroup$ please ...please...keep your hammer in your trousers.... $\endgroup$
    – Chris
    Nov 13, 2022 at 11:27
  • $\begingroup$ Thanks for this technique. I tried it, but was making some error with the shrink-wrap modifier. My cylinders from close up have pinches on the circles which are not obvious in my image I uploaded. But now after following your method, the result is superb, always helpful! $\endgroup$ Nov 13, 2022 at 11:46

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