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I have this ngon which I am trying to turn into a quad, I added an edge split on the side (it wouldn't go all, over the top face) and then I added a vertex on the middle edge and connected to the new edge loop, however first of all:

  1. I got a weird dotted line on my mirror
  2. If I select the face it acts as if the line doesn't exist, looks like 2 faces are selected but it is actually one face with an ignored edge in the middle

Why is this happening?

enter image description here

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    $\begingroup$ If you want to split a face by joining two vertices, use 'J' (Join) NOT 'F' (Fill). F will create a floating edge between the vertices but it will not split the face. $\endgroup$
    – John Eason
    Jul 11, 2023 at 13:50
  • $\begingroup$ @JohnEason Yes that's it! Can you post it as the answer please as it answers my question? $\endgroup$
    – BlenderBoy
    Jul 11, 2023 at 13:55
  • $\begingroup$ Answer now posted. $\endgroup$
    – John Eason
    Jul 11, 2023 at 14:25

4 Answers 4

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If you want to split a face by joining two vertices, hit J (Join) not F (Fill). The images below demonstrate what happens when you use each method to join opposing vertices on a cube:

1> Using F (Fill):

enter image description here

This has created an edge between the vertices but it has not split the face:

enter image description here

You can demonstrate this by subdividing the line, grabbing the centre vertex created, and moving it up:

enter image description here

The edge is only connected to the face at the original vertices.

  1. Using J (Join)

enter image description here

The result looks the same, but the face is actually split by the edge as you can see by selecting the triangular faces independently:

enter image description here

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  • $\begingroup$ Ha 😎 I haven't been use it in my 20 year experience, thanks for the answer. In this case I used a knife tool I guess ... $\endgroup$
    – vklidu
    Jul 19, 2023 at 6:31
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    $\begingroup$ Just something else to remember! :^) $\endgroup$
    – John Eason
    Jul 19, 2023 at 8:07
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I think that you have to delete this face and connect edges by yourself. Because I also often encounter such a problem, but it's usually enough for me to simply delete the face and connect everything on my own

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If I were in this situation, I would delete the face that cause problem, and also delete the edge above the face. and then I would make one more edge loope not to make n gon.

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you should remove the face and use a knife to get the middle line back

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