Loop cut stopped working

Hi,

Looking for some advice regarding the loop cut tool (beginner). Most of the time it works perfectly, but now it gives me some headache.

The issue is that, while working on a mesh, it refused to go all around the object for further loop cuts. I understood that there was something wrong with some duplicate/overlaying vertices / edges which were forming a face which stopped the tool going around. After solving that, I still have one place where i cannot solve it. it goes only partially around. I selected the problematic vertices and created a face. the extrude operation works, and the loop tool continues onto the extrusion. but with just the face created, without the extrusion, the loop tool refuses to cross the edge. I’ve checked normals, axes, duplicate/hidden objects/… nothing seems to work. don’t know what to check anymore. Any ideas? Thx.

The loop cut will only cut quads, I think.

The to be created edge loop stops at the poles (tris and n-gons) where the existing face loop terminates.

https://docs.blender.org/manual/en/latest/modeling/meshes/editing/edge/loopcut_slide.html#loop-cut-and-slide

not sure if this is my case, but the part of the mesh that I want to loop cut is really simple. I think that before i started working on it with the first loop cuts and filling it up again it wouldn’t have been a problem. current state

On each of the sides it works, but top and bottom not.

before the following on the sides was also an issue not going round but i was able to fix that.

This is an N-gon. N meaning more than 4 verts. This has 8.

loop-cut-sample_8

What is weird to me is that the number of edges is so high. Its like there is some hidden geometry somewhere. I tried to visualize this somehow by using solidify and yes in vertices it extrudes to the opposite side of the face. not sure why.

so the only way to work on this is with the knife tool?
thanks

Try (in edit mode) m (Merge> By Distance). To see if there are doubles, you can change how far apart the merge will happen in the Adjust Last Operation Panel.

Here are two ways. To connect two points, integrating the edge into the adjacent Face, Press J.

To slide points along edges, press G twice.

https://drive.google.com/file/d/1wPIzdGeFUgrEH4b5W8jWpmMkRjx6dg41/view?usp=sharing

Hi thanks, good idea. I tried that before, but didn’t fiddle with the distance. Now i did, it removed some things but still the same.

Thank you, i will give it a try :slight_smile:

Its a pretty simple shape, you could start again and be more careful.

In order to waste not too much of everyone’s time, I will use the knife tool as next resort.
I can recommend this one.
very informative : https://www.youtube.com/watch?v=Bj7KIk67j4k&list=PLbALQQAZAq_xO4gxe4Cik0mS9W7TUpH32&index=28
I will learn more tricks along the way to get things done.

Beginner anxiety I guess :slight_smile:

Funny thing I found about blender is that its kind of like putting your brain in a blender after a while…

Good Luck.

I had the same problem, and it wasnt an Ngon. In xray mode I recognized the middle point of the face wasnt in the middle so i tried selecting all in edit mode, pressed x and delete edge loops. I believe it was already cut, but on the edge that was paper thin. I can´t really explain because im quite new , but it worked after deleting the edge loop.