Alright so I've seen some postings about loop cuts and done some research. I am very new to blender and modeling overall. I am trying to loop cut this concrete barrier. Now I'm following a tutorial and kind of did my own thing in some areas. I cleaned it up following some instructions in another answer here on stack exchange.

I can't for the life of me figure out why I can loop cut around the whole bottom:
Bottom Section

...but not the whole middle:
Middle Section

I see this marked as answered by another question. That question refers to ngons and inside faces. Now once again I'm totally new to this. I looked on the inside. I don't believe I have inside faces or any ngons by the terms I've read online in my research.

Here is a wireframe picture and the inside view:
Wireframe View

Inside View

Maybe I'm missing something the answers on other posts are saying. If so and you know what it is I'd be very appreciative of what it is.

  • $\begingroup$ See the first answer on the other post. You have a ngon on the bottom of your mesh. $\endgroup$
    – iKlsR
    Commented Oct 17, 2014 at 4:21
  • $\begingroup$ Just tried removing that ngon because I realized it. It has no effect on the loop cut for the area I'm trying to work on. Any ideas? $\endgroup$
    – CrazyGrunt
    Commented Oct 17, 2014 at 4:38
  • $\begingroup$ I initially marked as a duplicate of this since the answer is on the other question but since you are new, I think this could get an answer. $\endgroup$
    – iKlsR
    Commented Oct 17, 2014 at 4:40
  • $\begingroup$ Related: blender.stackexchange.com/q/5066/599 $\endgroup$
    – gandalf3
    Commented Oct 17, 2014 at 6:19
  • $\begingroup$ Also related: blender.stackexchange.com/q/7990/599 and blender.stackexchange.com/q/33670/599 $\endgroup$
    – gandalf3
    Commented Aug 27, 2015 at 8:57

1 Answer 1


This is because the bottom face doesn't have the proper geometry, the edge ring tool doesn't know where to direct the ring since there are several vertices (it is an ngon). You can only use this tool on quads (4 sided faces). So to fix, you can use the knife tool and rework the ngon into a large quad.

enter image description here

Additionally, there is also another problem, you have duplicate vertices at the point where the cut stops. To fix, first box select (B) the points shown below and use Alt + M > At Center to merge the duplicate points into one.

enter image description here

After you do that, use the Knife Tool (K) to create a quad as shown below. Press K and select one vertex then another and press Enter. Repeat for the other side and you should be able to add edge rings after.

enter image description here

  • $\begingroup$ How do you know when you have duplicate vertices like that? Aside from that I will give this a try tomorrow. Thank you for the help. I spent a while trying to do this on my own and even asked a friend who uses Maya, but she wasn't sure. $\endgroup$
    – CrazyGrunt
    Commented Oct 17, 2014 at 5:06
  • $\begingroup$ It depends, in this case, it was hidden as it was right on top of the other, I noticed because the edge cut stopped there instead of the large bottom face. Additionally, you can sometimes use W > Remove Doubles to check for and clear these. $\endgroup$
    – iKlsR
    Commented Oct 17, 2014 at 5:09
  • $\begingroup$ I see. I just dragged the vertices and got that, Aha! moment. Thanks for all the help. I learned a lot just from this alone. $\endgroup$
    – CrazyGrunt
    Commented Oct 17, 2014 at 5:11
  • 1
    $\begingroup$ I looked it over and found more double vertices. I removed those and it allowed me to get the loop cut around barrier the long way. Thank you so much for pointing out the vertices issue along with the ngon and helping me. This was super helpful. $\endgroup$
    – CrazyGrunt
    Commented Oct 17, 2014 at 18:11

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