Im trying to create a cyclinder with the bottom and top rounded but when i use the Sub divison modifier it leaves these creases at both ends and if i use a loop cut to smooth it out it makes the object to flat at both ends and not rounded how can i fix this?enter image description here

  • $\begingroup$ Related - blender.stackexchange.com/questions/734/… $\endgroup$ – Mr Zak Nov 1 '15 at 20:38
  • $\begingroup$ @MrZak I think he is trying to not have sharp edges. $\endgroup$ – PGmath Nov 1 '15 at 21:30
  • $\begingroup$ @PGmath yes, probably it was better to say the main thing is topology. $\endgroup$ – Mr Zak Nov 1 '15 at 21:36

Those ugly creases are caused by the n-gon cap. The Subsurf modifier works best with quads and doesn't work well at all with n-gons.

Here are two alternate methods of filling the cap which produce quads, and thus much better subdivision modeling.

enter image description here

  • The first example was made by selecting the n-gon face and then hitting E (exturde) and then S to scale the extrusion inward. You could move the extruded part up to make the top less flat.

  • The second example was made by joining half the opposing vertices, making a quad fan. This could also be done by using the Grid Fill option. Again, the central vertex could be lifted up to make the top more round.

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