Loop Cuts and Inset Faces cutting Meshes #99219

New Issue

Alicia Faunce · 2022-06-27T20:32:00+02:00

Alicia Faunce commented

2022-06-27 20:32:00 +02:00

System Information
Operating system: Windows 10
Graphics card: NVIDIA GeForce GTX 750 TI

Blender Version
Broken: 3.2

Short description of error
Trying to add regular edge loops with Control + R, or even trying inset a face, they are cutting my mesh, or merging the ends. (I shared this on reddit, and it was suggested I create bug for it.

All I did was delete the bottom face of the mesh since I would not need it, but somehow I created invalid geometry and when I add an edge loop near the end it merges. If I try to inset the faces, it gives me weird end geometry.

(This is what was noted from someone on Reddit: Update: just checked the file and here are my findings:

  Adding a loop, be it length ways, long ways, or any other way seems to works just fine with the CTRL-R shortcut

  The loop cut tool also works just fine.. except if you try and loop cut around the XY plane instead of the XZ plane (drawing a line around the thinnest faces) at which point the mesh seems to collapse to zero height

  Insetting faces also works fine, be it via the tool or pressing I... but if you then try and extrude the inset suddenly the model collapses

Other things of note: the face orientation is inside out for this mesh (turning on Face Orientation in the Overlays menu (two overlapping circles in the header) shows them as red) and the object-level scale hasn't been applied. Fixing both of these doesn't correct any of the above issues -- although it IS normally advised since it prevents a few shading and modelling issues -- but it does, for some reason, change how the errors manifest, like the model collapsing in a slightly different way or the CTRL-R shortcut suddenly causing the same issues the tool version of loop cut and slide has.

Conclusion: you've somehow managed to turn this mesh into some form of invalid geometry that Blender can't seem to handle properly. You may wish to report it as a bug, including this file as a demonstration.

Exact steps for others to reproduce the error

Open .blend file
enter edit mode and select face mode
press numpad 3 for YZ plane view
Add loopcut on visible face side (it'll merge the edges)

repeat first 2 steps from above
press numpad1 for XZ plane view

select visible face -> extrude + scale (will merge edges). Works with inset tool

Test File:
Issues Build2.blend

**System Information** Operating system: Windows 10 Graphics card: NVIDIA GeForce GTX 750 TI **Blender Version** Broken: 3.2 **Short description of error** Trying to add regular edge loops with Control + R, or even trying inset a face, they are cutting my mesh, or merging the ends. (I shared this on reddit, and it was suggested I create bug for it. All I did was delete the bottom face of the mesh since I would not need it, but somehow I created invalid geometry and when I add an edge loop near the end it merges. If I try to inset the faces, it gives me weird end geometry. (This is what was noted from someone on Reddit: Update: just checked the file and here are my findings: ``` Adding a loop, be it length ways, long ways, or any other way seems to works just fine with the CTRL-R shortcut ``` ``` The loop cut tool also works just fine.. except if you try and loop cut around the XY plane instead of the XZ plane (drawing a line around the thinnest faces) at which point the mesh seems to collapse to zero height ``` ``` Insetting faces also works fine, be it via the tool or pressing I... but if you then try and extrude the inset suddenly the model collapses ``` Other things of note: the face orientation is inside out for this mesh (turning on Face Orientation in the Overlays menu (two overlapping circles in the header) shows them as red) and the object-level scale hasn't been applied. Fixing both of these doesn't correct any of the above issues -- although it IS normally advised since it prevents a few shading and modelling issues -- but it does, for some reason, change how the errors manifest, like the model collapsing in a slightly different way or the CTRL-R shortcut suddenly causing the same issues the tool version of loop cut and slide has. Conclusion: you've somehow managed to turn this mesh into some form of invalid geometry that Blender can't seem to handle properly. You may wish to report it as a bug, including this file as a demonstration. **Exact steps for others to reproduce the error** - Open .blend file - enter edit mode and select face mode - press numpad 3 for YZ plane view - Add loopcut on visible face side (it'll merge the edges) --- - repeat first 2 steps from above - press numpad1 for XZ plane view # select visible face -> extrude + scale (will merge edges). Works with inset tool Test File: [Issues Build2.blend](https://archive.blender.org/developer/F13305421/Issues_Build2.blend)

Alicia Faunce commented

2022-06-27 20:32:00 +02:00

Added subscriber: @afaunce04

Pratik Borhade commented

2022-06-28 11:58:20 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-06-28 11:58:20 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Pratik Borhade commented

2022-06-28 11:58:20 +02:00

Hi, thanks for the report. If I understand correctly, the issue here is your object's geometry is broken after adding the loop cut. right?
But it's not clear how to replicate the bug from give n data.

All I did was delete the bottom face of the mesh since I would not need it, but somehow I created invalid geometry and when I add an edge loop near the end it merges

As far as I can see you've already implemented this in your file. So what exactly I need to do further?
Also- Images you've attached and the model from the file are also different. Could you give us exact information for reproducing the problem?

Hi, thanks for the report. If I understand correctly, the issue here is your object's geometry is broken after adding the loop cut. right? But it's not clear how to replicate the bug from give n data. > All I did was delete the bottom face of the mesh since I would not need it, but somehow I created invalid geometry and when I add an edge loop near the end it merges As far as I can see you've already implemented this in your file. So what exactly I need to do further? Also- Images you've attached and the model from the file are also different. Could you give us exact information for reproducing the problem?

Alicia Faunce commented

2022-06-29 17:33:28 +02:00

The model in the file is correct. This larger cube is just a sample to show that it works fine on that. My actual little cube is the one that is the issue. Any time I inset faces or add loop cuts, it alters my geometry. I deleted it in my original file and just remade it, but it is doing the same thing. I am wondering if one of the BLENDER addons is causing this? I have Extra Objects on, Modifier Tools, Edit Mesh Tools, Loop Tools. I know by default these are turned off, so I am not sure if that is what is causing it.

Pratik Borhade commented

2022-06-30 05:22:58 +02:00

You mean Divider Planter? Can repro in that case if I add loop cut or extrude+scale along XZ plane
Same happens in 2.93. Are you sure 3.0.0 is good version?

You mean `Divider Planter`? Can repro in that case if I add loop cut or `extrude+scale` along XZ plane Same happens in 2.93. Are you sure 3.0.0 is good version?

Alicia Faunce commented

2022-06-30 06:43:00 +02:00

Yes that is the one! I am glad you were able to do it too. I also noticed, if I scaled down the bigger cube, and made it small like my original, it would also do the same thing. I would try to inset a face and it would completely alter my mesh, same for extruding and loop cut.

Pratik Borhade commented

2022-07-21 06:10:58 +02:00

Changed status from 'Needs User Info' to: 'Confirmed'

Philipp Oeser removed the

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Loop Cuts and Inset Faces cutting Meshes #99219

select visible face -> extrude + scale (will merge edges). Works with inset tool