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I just finished modeling this small pillar which I would like to have the curved parts smooth in the final render.

enter image description here

This is the model in Xray. enter image description here

I have tried the following modifiers to smooth it out. Bevel Subdivision or Multiresolution Smooth.

but obtained this result.

enter image description here

The Best I could obtain is the following with an object / shade smooth. enter image description here

The result is good but I would like to know why am I not managing it out with the subdivision and Bavel modifiers when many of the tutorials I see use them?

I have uploaded the file for anyone who wants to try it out.

Thanks in advance for and advise and help.

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    $\begingroup$ Hello :). There are many n-gons, which prevent the Bevel Modifier and smooth shading from working. I'd strongly advise to make the mesh all quads. It won't take long, the model is very simple. $\endgroup$ – Jachym Michal Dec 27 '19 at 11:27
  • $\begingroup$ Pardon my newness, so quads are 4 edged polygons but how much do n-gons have? $\endgroup$ – ronin074 Dec 27 '19 at 11:59
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    $\begingroup$ Hello again :). N-gons are any polygons with more than 4 edges. They're easy to create, but usually bring more problems than they solve. $\endgroup$ – Jachym Michal Dec 27 '19 at 12:20
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Basically in most cases you need just to Auto Smooth Normals at mesh data properties:

[Auto Smooth Normals

Use Shade Smooth for object globally (or selectively in Edit mode):

Shade Smooth

Sometimes when you import object from exchange formats may be needed to Clear Custom Split Normals Data:

Clear Custom Split Normals Data

Another solution to achieve Auto Smooth Normals data effect is applying of Edge Split Modified especially at work with curves or linked data.

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