I am trying to make a retopo of my human head. But it seems that I already have several ngons because I couldn't create an edge loop.

So I checked it with mesh lint and it showed me the ngons

enter image description here

But the ngons are really quads as far as I can see.

Any idea why this is happening?

blend file

  • 2
    $\begingroup$ Please upload blend-file. $\endgroup$ – Gunslinger Mar 7 '14 at 13:57

You have a large ngon face over the other faces. The same thing goes for the bottom of the nose and the chin. To fix this delete the large polygon and bridge the edges.

  1. Select the large ngon faces:

    enter image description here

  2. Delete the faces only

    enter image description here

  3. Use bridge to add new polygons. Or you can fill them one by one using the fill tool: F

    enter image description here enter image description here

  4. Do the same for the bottom of the nose and the chin.

enter image description here

  • $\begingroup$ I already tried that but that wasn't the problem. I've also uploaded the blend file itself. $\endgroup$ – Maik Klein Mar 7 '14 at 14:09
  • $\begingroup$ Oh .. I should have looked at the faces. Thank you very much. $\endgroup$ – Maik Klein Mar 7 '14 at 14:15
  • $\begingroup$ Alternatively, just go to Mesh > Cleanup > Delete Loose. Then delete the ngon and fill back the faces. $\endgroup$ – iKlsR Mar 7 '14 at 18:43
  • $\begingroup$ @iKlsR I tried this and it deletes the edges. The ngon is still there $\endgroup$ – Vader Mar 7 '14 at 18:55
  • $\begingroup$ I think this answer involves too much manual editing, since we have tools to fill in empty regions (added own answer), also, You could use Select Path before the bridge operation. one more thing - you can select all 3 edge loops and run bridge once. $\endgroup$ – ideasman42 Mar 8 '14 at 2:47

There are 2 ways I would suggest to fix up a model with edges like this.

Using Fill holes:

This tool was written for almost this exact case, it has the advantage it will fill in UV's. vertex-colors and materials from surrounding geometry.

See the docs

  • Delete the ngons (Only Faces), x, n
  • Select all, a
  • Mesh -> Cleanup -> Fill Holes

Using Face Create:

The default face creation will fill a wire-net of faces too, but in this case it goes too far and needs one face removed.

  • Delete the ngons (Only Faces), x, n
  • Select all,a
  • Mesh -> Faces -> Make Face/Edge, f
  • delete the large ngon created at the back.
  • $\begingroup$ This answer is actually better. I never knew blender had these modeling tools, they must be new $\endgroup$ – Vader Mar 8 '14 at 2:53
  • $\begingroup$ @Vader, Yes they are fairly new - added last release wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.69/… $\endgroup$ – ideasman42 Mar 8 '14 at 2:56
  • $\begingroup$ I s there a way to access the clean using keyboard shortcuts? I would expect them to be in the specials menu $\endgroup$ – Vader Mar 8 '14 at 3:01
  • $\begingroup$ No, they are intended to be tools you run to fix bad imported models to save manual work, but not used for general workflow. Note that 2.70 adds more cleanup tools wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.70/… $\endgroup$ – ideasman42 Mar 8 '14 at 3:04
  • $\begingroup$ They seem to be pretty useful to me for general modeling, even if that's not what they were intended as. $\endgroup$ – Vader Mar 8 '14 at 3:07

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