clay strip brush (and probably any brush) create some strange shading and geometry artifacts... #84169

New Issue

Michael Colina · 2020-12-27T06:30:08+01:00

Michael Colina commented

2020-12-27 06:30:08 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.89

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: 0f45cab862
Worked: (newest version of Blender that worked as expected)

Short description of error
clay strip brush (and probably any brush) create some strange shading and geometry artifacts...

Exact steps for others to reproduce the error

open blender, subdivide the default cube in edit mode a few times,
add subdiv modifier with 3 levels (25,1 million in total) and apply modifier.
go to sculpt mode and start playing with the clay strip brush and brush settings a little bit...
change the sculpt plane to view plane, and add a stroke continuously in the edge of the cube, and some transparent shading bug appears when i go to check the back side of the stroke made, but this get fixed when i use the smooth brush a little bit in those boundary edges...
change the sculpt plane to area plane again, and try on other edge the same again, and some grid topology starts to appear suddenly in the first stroke when drawing, but when i keep drawing it was less noticeable the artifact but was still there...

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.89 **Blender Version** Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: `0f45cab862` Worked: (newest version of Blender that worked as expected) **Short description of error** clay strip brush (and probably any brush) create some strange shading and geometry artifacts... **Exact steps for others to reproduce the error** 1. open blender, subdivide the default cube in edit mode a few times, 2. add subdiv modifier with 3 levels (25,1 million in total) and apply modifier. 3. go to sculpt mode and start playing with the clay strip brush and brush settings a little bit... 4. change the sculpt plane to view plane, and add a stroke continuously in the edge of the cube, and some transparent shading bug appears when i go to check the back side of the stroke made, but this get fixed when i use the smooth brush a little bit in those boundary edges... ![Captura de pantalla 2020-12-27 011521.png](https://archive.blender.org/developer/F9531682/Captura_de_pantalla_2020-12-27_011521.png) ![Captura de pantalla 2020-12-27 011545.png](https://archive.blender.org/developer/F9531684/Captura_de_pantalla_2020-12-27_011545.png) 5. change the sculpt plane to area plane again, and try on other edge the same again, and some grid topology starts to appear suddenly in the first stroke when drawing, but when i keep drawing it was less noticeable the artifact but was still there... ![Captura de pantalla 2020-12-27 011700.png](https://archive.blender.org/developer/F9531686/Captura_de_pantalla_2020-12-27_011700.png) ![Captura de pantalla 2020-12-27 011711.png](https://archive.blender.org/developer/F9531688/Captura_de_pantalla_2020-12-27_011711.png)

Michael Colina commented

2020-12-27 06:30:08 +01:00

Added subscriber: @Michael-Colina

blender-admin commented

2020-12-27 06:30:08 +01:00

#75687 was marked as duplicate of this issue

Pablo Dobarro was assigned by Michael Colina

2020-12-30 00:13:05 +01:00

Pablo Dobarro was unassigned by Falk David

2021-01-12 12:27:49 +01:00

Falk David commented

2021-01-12 12:27:49 +01:00

Added subscriber: @PabloDobarro

Falk David commented

2021-01-12 12:28:02 +01:00

Removed subscriber: @PabloDobarro

Falk David commented

2021-01-12 12:34:17 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-01-12 12:34:17 +01:00

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

Falk David commented

2021-01-12 12:34:17 +01:00

Is this still an issue on the latest master (2.92 Alpha)?

Michael Colina commented

2021-01-13 08:46:05 +01:00

In #84169#1091859, @filedescriptor wrote:
Is this still an issue on the latest master (2.92 Alpha)?

hello, yes i just tested the 2.92 alpha from yesterday, still the same issue....

> In #84169#1091859, @filedescriptor wrote: > Is this still an issue on the latest master (2.92 Alpha)? hello, yes i just tested the 2.92 alpha from yesterday, still the same issue....

Falk David commented

2021-01-15 17:00:29 +01:00

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

Michael Colina commented

2021-02-26 02:16:09 +01:00

guys still nothing about this, was it fixed in the 2.92 release?

Falk David commented

2021-02-26 08:47:12 +01:00

If we cannot reproduce the bug, we cannot fix it. I will ask other developers if they can reproduce this issue.

Pratik Borhade commented

2021-02-27 09:58:47 +01:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-02-27 09:58:47 +01:00

@filedescriptor , cannot reproduce the issue . version 2.93.0 alpha , Hash : 7a608f88a71 .

@filedescriptor , cannot reproduce the issue . version `2.93.0` alpha , Hash : `7a608f88a71` .

Falk David commented

2021-02-27 12:07:34 +01:00

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

Falk David commented

2021-02-27 12:07:34 +01:00

@PratikPB2123 Thanks for testing. @Michael-Colina Could you try the 2.93 alpha? This might have been fixed by some recent changes.

Michael Colina commented

2021-02-28 06:04:37 +01:00

hello Falk, here is a video that is self explanatory then... 20210227_235538.MP4

hello Falk, here is a video that is self explanatory then... [20210227_235538.MP4](https://archive.blender.org/developer/F9850158/20210227_235538.MP4)

Michael Colina commented

2021-03-07 03:22:36 +01:00

@filedescriptor @PratikPB2123 anything yet?

Pratik Borhade commented

2021-03-07 10:29:43 +01:00

@Michael-Colina , I can not reproduce it , not sure why it is occurring at your end .

Falk David commented

2021-03-07 15:05:13 +01:00

@Michael-Colina From what I can tell, that video uses 2.92.0. Have you tried the alpha from https://builder.blender.org/download/ yet?

Michael Colina commented

2021-03-08 08:12:50 +01:00

In #84169#1125524, @filedescriptor wrote:
@Michael-Colina From what I can tell, that video uses 2.92.0. Have you tried the alpha from https://builder.blender.org/download/ yet?

hello yes i just tried at this moment, and still the same problem appears with the same ultra subdivided default cube...

> In #84169#1125524, @filedescriptor wrote: > @Michael-Colina From what I can tell, that video uses 2.92.0. Have you tried the alpha from https://builder.blender.org/download/ yet? hello yes i just tried at this moment, and still the same problem appears with the same ultra subdivided default cube...

Falk David commented

2021-03-08 09:51:27 +01:00

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

Garek commented

2022-01-21 21:27:34 +01:00

Added subscriber: @Garek

Garek commented

2022-01-21 21:27:34 +01:00

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

Garek commented

2022-01-21 21:27:34 +01:00

Hi, I think it's related to #75687.

Can you see if Tip Roundness set to 1.000 will make artefacts more apparent?
After artefacts are shown, can you smooth area once and then undo to see if they're gone?

Hi, I think it's related to #75687. Can you see if Tip Roundness set to 1.000 will make artefacts more apparent? After artefacts are shown, can you smooth area once and then undo to see if they're gone?

Michael Colina commented

2022-01-27 03:37:02 +01:00

seem to be still present with and without front faces checked and with or without low or high tip roundness, and i think the problem when front faces is toggled off is obvious but i think should be amended anyways...

and pressing undo and redo the transparent face artifact seems to disappear, without having to smooth it...

2022-01-26 19-09-49 1.mp4

seem to be still present with and without front faces checked and with or without low or high tip roundness, and i think the problem when front faces is toggled off is obvious but i think should be amended anyways... and pressing undo and redo the transparent face artifact seems to disappear, without having to smooth it... [2022-01-26 19-09-49 1.mp4](https://archive.blender.org/developer/F12826235/2022-01-26_19-09-49_1.mp4)

Pratik Borhade commented

2022-03-08 10:51:35 +01:00

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

Pratik Borhade commented

2022-03-08 11:10:20 +01:00

Added subscriber: @iss

Pratik Borhade commented

2022-03-08 11:10:20 +01:00

Both reports indeed looks same.

@iss, can you check? (asking you since you've confirmed #84169)

Both reports indeed looks same. @iss, can you check? (asking you since you've confirmed #84169)

Richard Antalik commented

2022-03-09 15:25:54 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Richard Antalik commented

2022-03-09 15:25:54 +01:00

I think I was able to reproduce this. This is when I tried to follow step 4, sculpting with different brush then fixes the surface as described.

Step 5 is also easily reproducible. Not sure whether these are same bug or 2 different bugs though

I think I was able to reproduce this. This is when I tried to follow step 4, sculpting with different brush then fixes the surface as described. ![screen.png](https://archive.blender.org/developer/F12913877/screen.png) Step 5 is also easily reproducible. Not sure whether these are same bug or 2 different bugs though

Julien Kaspar commented

2022-05-19 11:53:18 +02:00

Added subscribers: @Frozen_Death_Knight, @PabloDobarro, @ankitm

Julien Kaspar commented

2022-05-19 15:39:40 +02:00

Added subscriber: @JulienKaspar

Julien Kaspar commented

2022-05-19 15:39:40 +02:00

Just to add some context. I can also still easily reproduce the bug just by using a high radius clay strips brush.
It seems to have a hard time between PBVH leaf nodes:

Just to add some context. I can also still easily reproduce the bug just by using a high radius clay strips brush. It seems to have a hard time between PBVH leaf nodes: ![Screenshot_2022-05-19_10-18-42.png](https://archive.blender.org/developer/F13090256/Screenshot_2022-05-19_10-18-42.png) ![Screenshot_2022-05-19_10-18-29.png](https://archive.blender.org/developer/F13090254/Screenshot_2022-05-19_10-18-29.png)

Philipp Oeser removed the

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clay strip brush (and probably any brush) create some strange shading and geometry artifacts... #84169