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Maniphest T81584

Modeling Object --Mesh "breaks screen" and causes shaded wedges
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Description

System Information
Operating system: Darwin-19.6.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro Vega 48 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.18

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-10-08 22:15, hash: rB2d5e38d4ece9
Worked: (newest version of Blender that worked as expected)

Short description of error
[Please fill out a short description of the error here]

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)]
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In Modeling, first image zoomed out shows no problem, but once mesh hits the "screen" when zooming in, shaded wedges appear and move over surface / change shape / get larger with increased zoom-in in 2nd image. This problem doesn't happen in Layout. It seems I can produce a-problem-a-day if I use Modeling and wonder what it is really needed for, IF the Layout mode can do the same things. Again this happens in Solid view, my GPU's nemesis.

ALSO, switching between Layout editing and Modeling editing is not at all synchronized so that everything is in an entirely different position IF one wanted to move from one mode to the next. Perhaps this is a more Advanced feature. Maybe I am just missing a Synchronize screen/modes switch somewhere.

Event Timeline

Paul Muns (dznwks) created this task.Oct 9 2020, 8:48 PM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Oct 13 2020, 3:55 PM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Please attach sample .blend file

Paul Muns (dznwks) added a comment.Oct 13 2020, 6:09 PM

HorseSaddle3xx.blend3 MBDownload

Hopefully it will open in Modeling with the 3 wedges of shadow showing. Move the mesh sideways and it becomes obvious. It happens in Solid view and User Perspective. Click 5, into Orthographic and it disappears.

Richard Antalik (ISS) changed the task status from Needs Information from User to Needs Triage.Oct 14 2020, 6:33 PM

I don't have such issue here.

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Needs Information from User.Oct 14 2020, 7:22 PM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

Also cannot reproduce this.

The example file seem different from the screenshots shown?

Please save a file exactly when you see those artifacts (or whatever they are - cannot tell from the screenshot alone), and also post another (updated) from exactly that state of the file when opened.

Paul Muns (dznwks) added a comment.Oct 15 2020, 1:07 AM

HorseSaddle3xxx.blend3 MBDownload

OK, well it must be an artifact created by my GPU having something to do with Perspective and Solid view. These screen captures show a slight view rotation and the wedges moving across the mesh surface.
Since it doesn't interfere with anything and only appears in Solid view and Modeling, I suggest moving on and Closing this for now. IF it somehow actually interferes in any important way, I will bring it back up.

Richard Antalik (ISS) closed this task as Archived.Nov 14 2020, 5:33 AM
Richard Antalik (ISS) claimed this task.

This may be (likely) caused by bug in GPU driver. In such case we can't really do anything about that unless there is workaround.

Since this is not causing problems really I can close this as suggested. Thanks for reporting anyway. If you manage to reproduce this on different GPU, please let us know.