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I just tried making a person in blender from a tutorial (first time I use blender) and somehow I can't make a loop-cut in the last 'box' thing. Yellow is what blender does, red is what I want added It is nor a triangle nor an N-gon, I checked for double sides/vertices but nothing seems to work.

How can I get a loop cut here?

The yellow is what blender does, and the red is what I want added

Here's the blend model: http://pasteall.org/blend/index.php?id=50184

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  • $\begingroup$ Look into non-manifold geometry, in this case this might be inner face visible on your screenshot (just where your red line touches edge loop, 1 face above loopcut made by Blender). Possibility to add a loopcut isn't related to mesh complexity, rather to its geometry $\endgroup$
    – Mr Zak
    Commented Aug 19, 2018 at 14:32
  • $\begingroup$ The failure of Ctrl-R to offer you a loop cut can be very useful for 'debugging' meshes which look OK, but have invisible faults, like internal faces. I sometimes use it with no intention of actually making a cut. $\endgroup$
    – Robin Betts ♦
    Commented Aug 19, 2018 at 15:59
  • $\begingroup$ That's actually very useful! I'll probably use that in the future. $\endgroup$
    – Grenadeapple
    Commented Aug 19, 2018 at 18:15

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You have 2 problems that make Blender unable to know how it could build the edge loop, as it needs quads to create edge loops automatically with ctrl R, and it can't deal with ambiguity:

  • A face inside your mesh that is not visible in Object mode. You need to select it and delete it with X > Faces
  • An edge loop coming from the bottom which makes a ngon at its end. You need to select it and delete it with X > Edge Loops

Now you can create a new edge loop.

enter image description here

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