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I often make small mistakes when extruding geometry for example when extruding walls for a house. Sometimes this creates double geometry. I know I can get rid of this using W > remove doubles. In this case I can't seem to get rid of this faulty geomtry (see screenshot). Somehow, these 3 vertices seem connected with a plane that I didn't create. I tried Remove Doubles, Dissolve, Delete etc... but nothing works.

Can someone tell me how to clean these problems please? Thank you.

enter image description here

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  • $\begingroup$ It may be the face of a non-planar n-gon. Could you check the nearby faces? $\endgroup$ – Carlo Jan 21 '18 at 20:24
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    $\begingroup$ There is indeed a non-planar face. When I go to face selection, I can select that whole corner as one face, which doesn't make sense. I think the mistake was caused by extruding everyting downwards. Is it possible to clean this up or should I just delete the whole thing? $\endgroup$ – skullforger Jan 21 '18 at 20:44
  • $\begingroup$ in face select mode select that triangle and delete it. $\endgroup$ – cegaton Jan 22 '18 at 0:02
  • $\begingroup$ You try selecting everything in Edit Mode, then Press W and select the Remove doubles option. $\endgroup$ – Tejas Jan 22 '18 at 0:25
  • $\begingroup$ @cegaton, the triangle is not recognised as a face $\endgroup$ – skullforger Jan 22 '18 at 20:40
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I can't see a lot from your image but this might be just a big n-gon, so maybe you can try selecting these two vertices marked in red and pressing J to create a line.
(it will probably solve it by completing the box shape)

enter image description here

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  • $\begingroup$ Thanks, I had to do some more deleting and redrawing but your tip got me on the right track. $\endgroup$ – skullforger Jan 22 '18 at 20:42

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