I'm following a tutorial for beginners and I can't figure out what I'm doing wrong despite a lot of time trying to figure it out.

When using the Loop Cut and Slide tool it is behaving differently for me than it does in the video I'm following. I'll show the images here in a second to give you an example of what I mean. So for me, after click-selecting my wanted axis, the tool selection only spans as far as the second next edge, where as for the instructor it spans around the entire wall - in this case I'm trying to mark a selection to extrude skirting.

The instructor using the tool: enter image description here

How the tool behaves for me: enter image description here

You can see that when creating the two horizontal edges (for the window) using this tool I had the same problem where the selection would only go as far as the second edge intersection it met. enter image description here

  • $\begingroup$ There is error somewhere in geometry on the third screenshot which probably leads to result in the second screenshot - either an Ngon (it can visually look the same as quad but have a vertex somewhere) or an internal face in the mesh. $\endgroup$ – Mr Zak Jun 13 '19 at 13:45

Here's a step by step instruction that shows you how to get the same result as the instructor did; hope it helps:


Start with the same basic wall shape


Now you add the two loop cuts (Ctrl + R) for the top and bottom of the window sill. By using the scroll wheel you can change the number of cuts you want to make, and then you can arrange them where you want.


Now add cuts for the sides of the window.


All you have to do now is grab the faces where the window is gonna be and delete them. To fill up the resulting gap, grab the outer edges of the window on both sides using edge select, hit ctrl+E, and select "Bridge Edge Loops". And there is your window! You should have no problems adding any loop cuts.

  • $\begingroup$ Thanks for that! I' still having this realy strange issue when I got to create my first loop cuts by selecting the tool and mousing over the area, I' only ever getting the option to create the vertical ones first. $\endgroup$ – slushHulk Jun 13 '19 at 14:09
  • $\begingroup$ weird... could you post a picture of the object right before you try to add any loop cuts? Post it in vertex select. $\endgroup$ – RBlong2us Jun 13 '19 at 14:18
  • $\begingroup$ Like this? imgur.com/TtOe9kS $\endgroup$ – slushHulk Jun 13 '19 at 14:24
  • $\begingroup$ Yeah. What I was looking for was to see if one of your faces had more than four vertices. That could cause a problem during loop cutting. Why don't you look it over and make sure? $\endgroup$ – RBlong2us Jun 13 '19 at 14:25
  • $\begingroup$ You may not know this; When adding a horizontal loop cut, you have to mouse near a vertical loop on this mesh. Try that. $\endgroup$ – RBlong2us Jun 13 '19 at 14:27

The face at the right of the window is a NGon (a polygon with more than 4 vertices). NGons prevent Loop Cut to find his "way" in your topology, so LoopCut just stops when he found a NGon.

  • $\begingroup$ Okay, thanks. I kinda get that - but how did the instructor manage to do it then? As you can see in the image, after I created the 2 vertical edges for the window the Loop Cut would not go past the second edge. You can see that the instructor has 2 more faces on that wall. $\endgroup$ – slushHulk Jun 13 '19 at 13:20
  • $\begingroup$ I added a third image to describe what I meant. $\endgroup$ – slushHulk Jun 13 '19 at 13:25

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