Sculpting produces weird shading artifacts #90598

New Issue

CHET · 2021-08-11T04:31:15+02:00

CHET commented

2021-08-11 04:31:15 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 950M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-07-31 18:26, hash: 17243337d7

Short description of error
When sculpting a low poly mesh, weird shading artifacts appear.
If you remove them with a modifier, then over time they reappear when sculpting
X9Tkiufd2w.mp4

.blend file showing in the video:	test.blend

Exact steps for others to reproduce the error

In a clean scene with no objects, Add a cylinder (or any low poly object, preferably with N-gons)
Enable Shade Smooth on the object. {nav Object > Shade Smooth}
Go to Sculpt Mode
Use a brush anywhere - the affected vertices will have their normals updated and change their look


If you undo or do any operation that affects the entire mesh it will change the shading everywhere

--

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 950M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-07-31 18:26, hash: `17243337d7` **Short description of error** When sculpting a low poly mesh, weird shading artifacts appear. If you remove them with a modifier, then over time they reappear when sculpting [X9Tkiufd2w.mp4](https://archive.blender.org/developer/F10277092/X9Tkiufd2w.mp4) |.blend file showing in the video:|[test.blend](https://archive.blender.org/developer/F10277093/test.blend) | -- | -- | **Exact steps for others to reproduce the error** - In a clean scene with no objects, Add a cylinder (or any low poly object, preferably with N-gons) - Enable Shade Smooth on the object. {nav Object > Shade Smooth} - Go to Sculpt Mode - Use a brush anywhere - the affected vertices will have their normals updated and change their look |![Screenshot_2022-03-08_10-59-39.png](https://archive.blender.org/developer/F12906836/Screenshot_2022-03-08_10-59-39.png)|![Screenshot_2022-03-08_11-00-01.png](https://archive.blender.org/developer/F12906842/Screenshot_2022-03-08_11-00-01.png) | -- | -- | If you undo or do any operation that affects the entire mesh it will change the shading everywhere |![Screenshot_2022-03-08_11-00-11.png](https://archive.blender.org/developer/F12906848/Screenshot_2022-03-08_11-00-11.png) | -- |

CHET commented

2021-08-11 04:31:15 +02:00

Added subscriber: @cheteron

blender-admin commented

2021-08-11 04:31:15 +02:00

#91583 was marked as duplicate of this issue

Philipp Oeser changed title from ~~Shader bug~~ to Sculpting produces weird shading artifacts

2021-08-12 10:11:49 +02:00

CHET commented

2021-08-19 13:39:38 +02:00

![image.png](https://archive.blender.org/developer/F10291575/image.png)

Germano Cavalcante commented

2021-08-20 14:48:01 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-08-20 14:48:01 +02:00

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

Germano Cavalcante commented

2021-08-20 14:48:01 +02:00

Thanks for the report. I can confirm in the file.
But since this problem seems to be mitigated by entering and exiting edit mode, we need to know how to reproduce it from scratch.

We can see that the mesh normal is messed up. But how they got that way is important for us to fix the problem.

Thanks for the report. I can confirm in the file. But since this problem seems to be mitigated by entering and exiting edit mode, we need to know how to reproduce it from scratch. We can see that the mesh normal is messed up. But how they got that way is important for us to fix the problem.

Germano Cavalcante commented

2021-08-20 15:02:51 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Germano Cavalcante commented

2021-08-20 15:02:51 +02:00

Well, I can now see that the "draw" brush affects the normals more roughly:

So the problem could be out there.

Well, I can now see that the "draw" brush affects the normals more roughly: ![GIF.gif](https://archive.blender.org/developer/F10296012/GIF.gif) So the problem could be out there.

Pratik Borhade commented

2021-08-20 15:45:40 +02:00

Added subscriber: @PratikPB2123

CHET commented

2021-10-10 04:17:57 +02:00

Can you fix this?

Germano Cavalcante commented

2021-10-11 16:28:55 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Germano Cavalcante commented

2021-10-11 16:28:55 +02:00

I'm taking a risk and confirming the bug.

CHET commented

2022-03-07 02:51:54 +01:00

Guys, Blender 3.0.1 Release(!), where is bug fix?

Guys, Blender 3.0.1 Release(!), where is bug fix? ![image.png](https://archive.blender.org/developer/F12900079/image.png)

Germano Cavalcante commented

2022-03-07 19:15:19 +01:00

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

Germano Cavalcante commented

2022-03-07 19:15:19 +01:00

Actually, I can no longer reproduce the problem in the last daily build.
Please try with the latest daily build: https://builder.blender.org/download/daily/archive/

Note that it is also possible that you may be seeing bad custom split normals, or limitations with triangles. (We would need the file to check)

Actually, I can no longer reproduce the problem in the last daily build. Please try with the latest daily build: https://builder.blender.org/download/daily/archive/ Note that it is also possible that you may be seeing bad custom split normals, or limitations with triangles. (We would need the file to check)

CHET commented

2022-03-07 19:23:21 +01:00

A file is already attached to the topic topic, I am attaching another one. It is very sad that you are releasing a release without even closing the bugs
test.blend

A file is already attached to the topic topic, I am attaching another one. It is very sad that you are releasing a release without even closing the bugs [test.blend](https://archive.blender.org/developer/F12901257/test.blend)

Germano Cavalcante commented

2022-03-07 19:34:44 +01:00

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

Germano Cavalcante closed this issue

2022-03-07 19:34:44 +01:00

Germano Cavalcante self-assigned this 2022-03-07 19:34:44 +01:00

Germano Cavalcante commented

2022-03-07 19:34:44 +01:00

I reproduced this bug in the latest official release, but not the latest daily build, so it appears the bug has been fixed already.

Maybe this bug is related to this other one #94838 (Normals not properly updating when using a Deform modifier after a Data Transfer (Custom Normals) modifier).
It was resolved with cfa53e0fbe.
Unfortunately that commit cannot be backported to 3.0.

If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.

I reproduced this bug in the latest official release, but not the latest daily build, so it appears the bug has been fixed already. Maybe this bug is related to this other one #94838 (Normals not properly updating when using a Deform modifier after a Data Transfer (Custom Normals) modifier). It was resolved with cfa53e0fbe. Unfortunately that commit cannot be backported to 3.0. If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.

CHET commented

2022-03-07 19:38:57 +01:00

I have the latest build installed, specially checked the numbers. I do not have custom normals and deformation modifiers, it is clearly visible in the scene, the problem concerns the sculpt

The problem is not resolved!

I have the latest build installed, specially checked the numbers. I do not have custom normals and deformation modifiers, it is clearly visible in the scene, the problem concerns the sculpt ![blender_Aw1X5wfVdJ.jpg](https://archive.blender.org/developer/F12901334/blender_Aw1X5wfVdJ.jpg) ![image.png](https://archive.blender.org/developer/F12901379/image.png) The problem is not resolved! ![image.png](https://archive.blender.org/developer/F12901351/image.png)

Germano Cavalcante commented

2022-03-07 19:56:00 +01:00

Sorry, I pointed the wrong link in a previous comment.
See this one: https://builder.blender.org/download/daily/

The release of 3.1 is scheduled for the end of this week and the developers are already working on 3.2.

Sorry, I pointed the wrong link in a previous comment. See this one: https://builder.blender.org/download/daily/ The release of 3.1 is scheduled for the end of this week and the developers are already working on 3.2.

CHET commented

2022-03-07 20:11:35 +01:00

Blender 3.1

Blender 3.1 ![image.png](https://archive.blender.org/developer/F12901450/image.png)

Germano Cavalcante commented

2022-03-07 22:27:54 +01:00

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

Germano Cavalcante reopened this issue

2022-03-07 22:27:54 +01:00

Germano Cavalcante commented

2022-03-07 22:27:54 +01:00

Sad that the problem has not been resolved. But just an image doesn't help us to progress.
Note that in order to forward the report to the developers it is necessary to replicate the problem.
Opening a file that apparently is ok does not help to identify the bug, it is also necessary the "steps for others to reproduce the error".

Apparently the problem is partially fixed because the original file and the file attached in the comments do not show the problem.
So if you found a new way to trigger the problem, it's important to inform how you did it.

A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

Sad that the problem has not been resolved. But just an image doesn't help us to progress. Note that in order to forward the report to the developers it is necessary to replicate the problem. Opening a file that apparently is ok does not help to identify the bug, it is also necessary the "**steps for others to reproduce the error**". Apparently the problem is partially fixed because the original file and the file attached in the comments do not show the problem. So if you found a new way to trigger the problem, it's important to inform how you did it. A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

CHET commented

2022-03-07 23:16:56 +01:00

You have a file with bug, I don't know how to reproduce it. It appears in the sculpt with lowpoly randomly.

Julien Kaspar commented

2022-03-08 12:08:32 +01:00

Added subscriber: @JulienKaspar

Julien Kaspar commented

2022-03-08 12:08:32 +01:00

I think this is a fairly old bug that can be replicated with any primitive object. For example you can add a cylinder, smooth shade it and enter sculpt mode.
At first the shading will be exactly like in object mode:

If you use a brush anywhere, the affected vertices will have their normals updated and change their look:

If you undo or do any operation that affects the entire mesh it will change the shading everywhere:

I think this is a fairly old bug that can be replicated with any primitive object. For example you can add a cylinder, smooth shade it and enter sculpt mode. At first the shading will be exactly like in object mode: ![Screenshot_2022-03-08_10-59-39.png](https://archive.blender.org/developer/F12906836/Screenshot_2022-03-08_10-59-39.png) If you use a brush anywhere, the affected vertices will have their normals updated and change their look: ![Screenshot_2022-03-08_11-00-01.png](https://archive.blender.org/developer/F12906842/Screenshot_2022-03-08_11-00-01.png) If you undo or do any operation that affects the entire mesh it will change the shading everywhere: ![Screenshot_2022-03-08_11-00-11.png](https://archive.blender.org/developer/F12906848/Screenshot_2022-03-08_11-00-11.png)

Germano Cavalcante removed their assignment 2022-03-08 15:29:23 +01:00

Germano Cavalcante commented

2022-03-08 15:29:23 +01:00

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

Germano Cavalcante commented

2022-03-08 15:32:43 +01:00

Thanks for the updates.
I was able to replicate the problem and update the report.
It is now in the #sculpt_paint_texture developers task stack.

Thanks for the updates. I was able to replicate the problem and update the report. It is now in the #sculpt_paint_texture developers task stack.

Julien Kaspar commented

2022-05-10 14:09:58 +02:00

Added subscriber: @GabrielMoro

Philipp Oeser removed the

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Sculpting produces weird shading artifacts #90598