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Black Artifacts/blocks when panning viewport with certain 3D models or blend files
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: AMD Radeon(TM) Vega 6 Graphics ATI Technologies Inc. 4.5.14757 Core Profile Context 20.11.2 27.20.14501.18003

Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2021-01-11 21:30, hash: rBacbda123ad08

Short description of error
When loading certain models (For example the blender cloud Rain V2 model, see attached file), when you pan the camera or viewport, the model seems to leave Black Artifacts on the area around where it was.
This does not appear in renders. This happens every time the file is opened and there doesn't seem to be a way to fix it.

Exact steps for others to reproduce the error

  • Open the attached .blend file
  • Pan the viewport around

Event Timeline

Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.Jan 22 2021, 3:43 PM
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".

I can confirm the bug.
It is only seen with workbench.
I'm still not sure what causes it.
It was introduced in blender 2.91 somewhere between rBdeb76548c108 and rB6fe609d4c3d0.

I was able to reproduce reliable on one machine (Vega + AMD drivers) but I only have access to that machine on Friday. I took the GPU and installed it on my home machine, but that had other issues.

Just found out that it dosent happen in render dev or render viewport (thats eevee and cycles)

It only happens when workbench does a partial x-ray. XRay is turned off but one of the materials has a transparent viewport color.
See

for a minimal example.

In this attached file, the problem is very similar to the T83022: Transparency in Solid View Causes Glitch Artifacts.
In fact, the same patch that is in the comment T83022#1071687 solves the problem described in this report.