I'm trying to smooth cone's side like I did for a cylinder using Edge Split and Subdivision Surface.

However, the cone (red one) is changing its shape at the top: enter image description here enter image description here

How can I prevent this?

  • 1
    $\begingroup$ You could try adding an edge loop very close to the top. $\endgroup$
    – Ezra
    Commented Apr 14, 2017 at 21:04

2 Answers 2


The easiest way is to actually use a cylinder. you can then shrink the top to a very small size in order to make it feel like a cone. Then add an edge split modifier and the SubSurf. The reason a cylinder is better is that the edge split doesn't work really well for triangles, and the cone basemesh is made of triangles. (You can't add edge loops on a cone).

Cylinder-cone trick

On the screenshot I made the cylinder top big so you can see it's actually a cylinder but feel free to shrink the size as you want.

  • 1
    $\begingroup$ related: blender.stackexchange.com/questions/39289/… and blender.stackexchange.com/questions/35581/… and blender.stackexchange.com/questions/23363/… $\endgroup$
    – user1853
    Commented Apr 15, 2017 at 2:29
  • 1
    $\begingroup$ I would like to note that I used Simple Deform -> Taper modifier to change the shape of a cylinder. $\endgroup$
    – Skyblade
    Commented Apr 15, 2017 at 10:55
  • $\begingroup$ I didn't find the modifier you are talking about in the modifiers panel ------------------------------------------------------------------------------------------------- edit oh sorry actually it is in the modifier panel just didn't understant you had to pick the simple deform modifier with taper option $\endgroup$ Commented Apr 15, 2017 at 17:41
  1. I extrude the bottom ring just a tiny bit like you see on the picture.
  2. Then I took the original loop above and performed edge slide all the way up to where you see the tiny loop up top.
  3. Then I extruded the bottom loop again a tiny bit like the first time.
  4. And finally I made the bottom loop completely sharp.

Smooth Cone


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