Sorry for the weird title, I didn't know how to express it better.

I have created a cube to form a hat. I then extruded the 4 bottom vertices. I did not move them after extruding, but I simply scaled them.

Then I pressed Ctrl+1 to add geometry. For some reason, the hat brim is much smaller than I expected.

Shouldn't the hat brim be as large as the 4 extruded, scaled bottom vertices?

And does anybody perhaps see why the hat brim gets doubled vertices?

Thank you for the help! enter image description here

  • 1
    $\begingroup$ @cegaton Shouldn't this be an answer and not a comment? $\endgroup$ Mar 24, 2015 at 15:09

1 Answer 1


By pressing Ctrl 1 you added a Subsurf Modifier with one subdivision. The default subdivision agorithm is Catmull-Clark, which tends to round off the geometry, hence the roundness you see in the ghosted image. On the modifier you can change the subdivision from Catmull-Clark to Simple.

enter image description here

  • $\begingroup$ But what about the double vertices? You don't get them, I think. $\endgroup$ Mar 24, 2015 at 15:31
  • $\begingroup$ @JohannHesters those double vertices are caused by the bottom face. You can delete that since you are trying to do a hat... $\endgroup$
    – user1853
    Mar 25, 2015 at 14:11

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