I'm learning Blender and following Blender Guru's Intermediate Modeling Tutorial to make an anvil. I made a small mistake and had a duplicate vertex that could not be cleared by the Remove Double Vertices tool for whatever reason, so I went in and deleted it myself then restored the face. However, the new face now has sharp edges that won't subdivide and I don't understand why.

I've attached a screenshot that will hopefully provide a little more context. I'm referring to the two faces on the tip of the horn of the anvil, relatively centered in the viewport. The edges are sharp and I'm trying to round it to a point. You may also see a similar issue happening at the corners of the higher part of the body towards the top right of the viewport.

P.S. I'm aware that I'm using the 2.8 Beta and he's using an older version in the tutorial, so I'm not sure if something would have changed between these versions that either causes this issue or the way to solve it just isn't as clear.

Anvil with jagged edge

  • $\begingroup$ I think @person132 is probably right.. but also, in these situations, always check for internal / double faces. $\endgroup$
    – Robin Betts
    Apr 24, 2019 at 5:38

1 Answer 1


The most likely explanation is that the new faces normals are flipped.

In the image below, i created a cube, added a subdivision surface, and then flipped the normals on the top face. As you can see, the top face becomes sharp, but it is hard to see why. However, if you select it and do the "flip normals" command, it returns to normal.

bad subdivide

This may not be your issue, but try selecting the affected faces and using either Flip Normals or Make Normals Consistent, and it will most likely fix your issue.

  • $\begingroup$ It only sort of worked...flipping the normals makes the end just a flat square, which is visually okay, but it just doesn't subdivide the face at all then. Otherwise, making normals consistent doesn't do anything. $\endgroup$
    – Cadoma
    Apr 24, 2019 at 13:45
  • $\begingroup$ Wait I thought the end was already a flat square? If you upload the blender file I can probably come up with a solution that makes it subdivided, $\endgroup$
    – person132
    Apr 24, 2019 at 14:42
  • $\begingroup$ Here's a link for the file: mega.nz/#!uQQB1CrB!GCeUpmCYQS38ae-i34L_TQkeI4I7v1R9yX4HrchQ92E $\endgroup$
    – Cadoma
    Apr 24, 2019 at 15:51

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