Knife create a hole in the face cutted. #48683

New Issue

rm beer · 2016-06-19T20:11:38+02:00

rm beer commented

2016-06-19 20:11:38 +02:00

Version: 2.77a abf6f08

Have a bug for any faces of any mesh, i unknown where or when appear the hole. This hole appear or not appear if change the amount of cut.

knife_cut_hole.blend

Version: 2.77a abf6f08 Have a bug for any faces of any mesh, i unknown where or when appear the hole. This hole appear or not appear if change the amount of cut.![Captura de pantalla_2016-06-19_14-54-50zz.png](https://archive.blender.org/developer/F317704/Captura_de_pantalla_2016-06-19_14-54-50zz.png) [knife_cut_hole.blend](https://archive.blender.org/developer/F317781/knife_cut_hole.blend)

rm beer commented

2016-06-19 20:11:38 +02:00

Changed status to: 'Open'

rm beer commented

2016-06-19 20:11:38 +02:00

Added subscriber: @KillerWasp

Alex commented

2016-06-20 11:55:27 +02:00

Added subscriber: @SpectreFirst

Alex commented

2016-06-20 11:55:27 +02:00

System Information
Intel Core i7, 8 Gb RAM, AMD Radeon HD 7700
Windows 7 x64

Blender Version
Broken: 2.77 2e553f7 and 2.77a abf6f08
Worked: 2.76b f337fea

Short description of error

It happens on Plane and UV Sphere primitives.
I wasn't able to reproduce it on Torus.
It happens randomly on Cube (I was able to reproduce this on Cube's vertical sides).
Happens on some polygons of Suzanne.
Seems to happen on quads.
I have tried to export Plane and UV Sphere primitives into .OBJ, re-import them and make a cut and there were no holes.
Exporting and re-importing from .FBX and cutting does produce a hole.
2.76b doesn't seem to have this problem.

Exact steps for others to reproduce the error
Start Blender, create a simple Plane or UV Sphere primitive, enter Edit Mode, select Knife tool, make a cut just like on provided picture and hit Enter to finish the cut.

In 2.76b you will have a diamond cut as expected.
In 2.77 you will have a diamond cut as well, but with a hole in one of the corners.

This case is very confusing to me because I don't see a clear pattern here, but I hope that my tests will help you with further investigation.

**System Information** Intel Core i7, 8 Gb RAM, AMD Radeon HD 7700 Windows 7 x64 **Blender Version** Broken: 2.77 2e553f7 and 2.77a abf6f08 Worked: 2.76b f337fea **Short description of error** - It happens on Plane and UV Sphere primitives. - I wasn't able to reproduce it on Torus. - It happens randomly on Cube (I was able to reproduce this on Cube's vertical sides). - Happens on some polygons of Suzanne. - Seems to happen on quads. - I have tried to export Plane and UV Sphere primitives into .OBJ, re-import them and make a cut and there were no holes. - Exporting and re-importing from .FBX and cutting does produce a hole. - 2.76b doesn't seem to have this problem. **Exact steps for others to reproduce the error** Start Blender, create a simple Plane or UV Sphere primitive, enter Edit Mode, select Knife tool, make a cut just like on provided picture and hit Enter to finish the cut. - In 2.76b you will have a diamond cut as expected. - In 2.77 you will have a diamond cut as well, but with a hole in one of the corners. This case is very confusing to me because I don't see a clear pattern here, but I hope that my tests will help you with further investigation.

Campbell Barton self-assigned this 2016-06-20 13:54:25 +02:00

Campbell Barton commented

2016-06-21 00:08:41 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2016-06-21 00:08:41 +02:00

blender-admin commented

2016-06-21 00:10:56 +02:00

This issue was referenced by a170607578

This issue was referenced by a170607578b8911df30039dacf7399506476be87

Alex commented

2016-06-22 11:55:45 +02:00

I don't know if I'm just unlucky, but it looks like there is still a problem with knife tool in build 6fbe6eb0:
Create a default UV Sphere and try to cut some polygons in a way like on provided picture. As a result you will have one of the corners with inverted normal. There was a hole there, it is gone now, but now there is an inverted polygon on its place. Don't know if that will help with anything, but I thought I should bring this to your attention anyway. You can use my test file: open the file and try to cut selected polygon or any of its neighbors.

knife_cut_inverted_normal.blend

I don't know if I'm just unlucky, but it looks like there is still a problem with knife tool in build 6fbe6eb0: Create a default UV Sphere and try to cut some polygons in a way like on provided picture. As a result you will have one of the corners with inverted normal. There was a hole there, it is gone now, but now there is an inverted polygon on its place. Don't know if that will help with anything, but I thought I should bring this to your attention anyway. You can use my test file: open the file and try to cut selected polygon or any of its neighbors. ![knife_cut_inverted_normal.png](https://archive.blender.org/developer/F318196/knife_cut_inverted_normal.png) [knife_cut_inverted_normal.blend](https://archive.blender.org/developer/F318198/knife_cut_inverted_normal.blend)

rm beer commented

2016-06-28 05:06:23 +02:00

Wait! Closed and resolved?? why?? where??
i view that more users have the same problem! :S

Wait! Closed and resolved?? why?? where?? i view that more users have the same problem! :S

Campbell Barton commented

2017-09-16 09:20:47 +02:00

@KillerWasp - if you can redo this bug, please report a new bug.

I just double checked and I can't reproduce the two errors reported here.

@KillerWasp - if you can redo this bug, please report a new bug. I just double checked and I can't reproduce the two errors reported here.

mathieu menuet commented

2017-09-16 12:03:52 +02:00

Added subscriber: @bliblubli

mathieu menuet commented

2017-09-16 12:03:52 +02:00

@KillerWasp couldn't reproduce either with the 2 files. Maybe get a fresh buildbot and delete your config folder?

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Knife create a hole in the face cutted. #48683