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Maniphest T90504

Texture Painting - refuses to properly paint when Graphics Tablet device is used for input, "deletes" parts of the model?
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: rB1eb06de2607a
Worked: (newest version of Blender that worked as expected) ? 2.8 something

Short description of error
[Please fill out a short description of the error here]
I tried to do texture paint on my model in 3D view. Mouse click, no problem. As soon as my graphics tablet is involved (Huion Inspiroy Q11K), it erases parts of my 3D model? I have no idea, why. I have the same paint settings, I have no zero alpha. I disabled the pressure sensitivity settings but they don't fix anything. I updated my Blender from 2.91 to the latest just now and the issue is still persistent.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
I have no idea. A file with proper working texture paint and switching to a graphics tablet, try to paint on the model, if parts of it disappear then it's the issue. My file is too large to upload.

If anything else is needed, let me know, I'll try to provide the information.

Event Timeline

J. O. (Papercut) created this task.Aug 7 2021, 6:33 PM
Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Needs Information from User.Sep 1 2021, 10:30 AM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

Hi and thx for the report.

Please try to upload a minimal .blend file where this issue occurs (otherwise I cannot reproduce this and chances are high no-one ever will be).

J. O. (Papercut) added a comment.EditedSep 2 2021, 3:33 AM

untitled.blend1 MBDownload

Latest one:

untitled.blend1 MBDownload

I hope this serves the investigation, the white stroke is done by mouse, the ... uh hole is done by my "HUION Inspiroy Q11K" (Version1)
Anything else, I'd be happy to contribute.

Edit: My GT does not have an "eraser" function.
Edit 2: Reuploaded the file, texture was missing.

Philipp Oeser (lichtwerk) changed the task status from Needs Information from User to Needs Triage.Sep 4 2021, 11:44 AM
Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Needs Information from User.Sep 27 2021, 12:19 PM

Sorry this slipped through.

It seems the texture is missing, can you pack it and reupload the .blend file?
(or provide the texture separately?)

J. O. (Papercut) added a comment.EditedSep 27 2021, 12:24 PM

Thanks, seems I missed to pack the texture. Reuploaded just this moment, if anything else, just let me know.

I just observed the issue seems to be gone?? This was unexpected as I didn't change a thing in my file. I'll check the other file for changes now.

Edit: Seems the issue solved itself. I'll keep my eyes open on whether it'll show up again, though.

Philipp Oeser (lichtwerk) changed the task status from Needs Information from User to Needs Triage.Sep 27 2021, 12:31 PM
Philipp Oeser (lichtwerk) closed this task as Archived.Sep 27 2021, 3:20 PM

OK, thx checking.
Will archive for the time being, but feel free to comment again if issues resurface (we can always reopen in such case).