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I tried crating faces but it left missing edges. In the end I was left with all the right lines but there was no vertex in the center.

enter image description here

Here's a follow up image in case you're wondering what I mean. Notice how there's no vertex in the center.

enter image description here

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  • $\begingroup$ can't you just create an edge by selecting two opposite vertices and pressing f, then subdivide it once to get a vertex in the middle? $\endgroup$
    – user2816
    May 10, 2014 at 5:03
  • $\begingroup$ tried subdividing, it didnt work. In fact it kinda made a mess. It created a vertice in the mid point of every edge, but that's all. It didn't even make any edges. $\endgroup$
    – luigi
    May 10, 2014 at 5:15
  • $\begingroup$ An addendum to the answers: after filling the grid, it may be necessary to flip or recalculate the normals in the newly restored part of the mesh. $\endgroup$
    – brasshat
    Jun 20, 2015 at 4:24

2 Answers 2

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If both sides have the same number of vertices, you can quickly do this by using the Grid Fill tool (CtrlF > Grid Fill) and tweaking the operator settings. A Span and Offset of 2 should do the trick.

enter image description here

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It is recommended to use Grid Fill tool (Mesh > Faces > Grid Fill). I would like to give some further tips for it:

  • The initial connection pattern depends on the active vertex. In this case, you can avoid additional tweakings on Span and Offset by simly keep the "corner" vertex active before filling. See comparison below:

With non-corner vertex active:

enter image description here

With corner vertex active:

enter image description here

  • You can also just select a pair of connected vertices of opposite side, then fill, which can also provide a one-stop result.

enter image description here

  • All in all, the easiest way to this is: In Edge Select mode, AltRMB on any border edge, which will select the complete loop, then operate Grid Fill, which can well handle it at most time (especially for regular holes like this) regardless the active element concern.

enter image description here

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  • $\begingroup$ Oh my GOSH that tidbit about the corner vertex being selected for grid fill to work properly has finally put hours of googling to and end. Thank you for your comprehensive and concise answer. $\endgroup$
    – Partack
    Apr 21, 2022 at 18:32

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