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This is a basic beginner question which should have already an answer, but I don't know what to search for.

I have a mesh with an edge connected to two vertices of a face, but not part of the face:

enter image description here

I would like to know how the face and the edge can be converted into two quads:

enter image description here

I know that deleting the face and creating two new ones is possible, but I'm interested in a method not requiring to delete anything.

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You can create an edge there by selecting the two vertices of this provisional edge, and pressing the shortcut key J.

enter image description here

This nice tool works well even for creating several continuous edges

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  • $\begingroup$ The edge already exists! $\endgroup$ – mins Dec 21 '15 at 13:15
  • $\begingroup$ @mins, did you create it with the "F" key ("Make Edge/Face")? If so, that edge is unrelated to this face and you can delete it (X > edges). The method specified above will actually split the face and the new edge will be the border edge between the two new faces. $\endgroup$ – TLousky Dec 21 '15 at 13:22
  • $\begingroup$ I don't remember, but likely yes, I'm learning modeling and don't master the different ways of creating elements. I realize that your method is good anyway (deleting the edge, re- creating with Join). Is there a possibility to unify the edge and the face directly? $\endgroup$ – mins Dec 21 '15 at 13:26
  • $\begingroup$ If you create an edge with the F key and then with the J key, you'll end up with two edges, one on top of the the other. You can either delete the useless one created with the F key, or use the cleanup operator of the 3D printing toolbox to clean all such overlapping edges. wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Modeling/… $\endgroup$ – TLousky Dec 21 '15 at 13:31

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