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Maniphest T95242

GPU Subdivision: Shade smooth Artifacts with edge crease
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Description

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.13

Blender Version
Broken: version: 3.1.0 Alpha, branch: master, commit date: 2022-01-26 21:12, hash: rB0e86c60c28b6
Worked: (newest version of Blender that worked as expected)

Short description of error
When GPU SubD enable, Mean Crease + SubD create shade artefact.
In 3.0 all good.


Exact steps for others to reproduce the error

  1. Enable GPU Subdivision from preferences
  2. Add cylinder
  3. shade smooth
  4. Add subdivision surface modifier
  5. Switch to edit mode
  6. select top face
  7. Edge → Edge Crease or Shift + E
  8. Change factor to 1

File with first 6 steps:

T95242.blend804 KBDownload

Revisions and Commits

rB Blender
rB118a219e9dce Fix different shading between CPU and GPU subdivision

Event Timeline

Eugene (cgeugene) created this task.Jan 27 2022, 8:03 AM
Eugene (cgeugene) updated the task description. (Show Details)Jan 27 2022, 8:06 AM
Pratik Borhade (PratikPB2123) added a subscriber: Pratik Borhade (PratikPB2123).Jan 27 2022, 10:34 AM

Hi, thanks for the report. I can not reproduce with your given steps on 3.1.0
probably artifacts appears on NVIDIA GPU only?

System Information
Operating system : Windows-10-10.0.18362-SP0 64 Bits
Graphics card : AMD Radeon(TM) 535 ATI Technologies .
Eugene (cgeugene) updated the task description. (Show Details)Jan 27 2022, 2:29 PM
Eugene (cgeugene) added a comment.Jan 27 2022, 2:32 PM

shade smooth?
so far I can only check on nvidia

Pratik Borhade (PratikPB2123) changed the task status from Needs Triage to Confirmed.Jan 27 2022, 2:39 PM
Pratik Borhade (PratikPB2123) added a project: EEVEE & Viewport.

Hi, can reproduce now. Thanks for the clarifying.

Pratik Borhade (PratikPB2123) renamed this task from Mean Crease GPU SubD shading Bug to GPU Subdivision: Shade smooth Artifacts with edge crease.Jan 27 2022, 2:52 PM
Pratik Borhade (PratikPB2123) updated the task description. (Show Details)
Pratik Borhade (PratikPB2123) added a subscriber: Kévin Dietrich (kevindietrich).

Hi @Kévin Dietrich (kevindietrich) , can you look at this issue?

Pratik Borhade (PratikPB2123) triaged this task as High priority.Feb 25 2022, 12:43 PM

Issue still persists on latest master. Raising the priority since it's a bug in new feature.

Feel free to lower the priority

Kévin Dietrich (kevindietrich) closed this task as Resolved by committing rB118a219e9dce: Fix different shading between CPU and GPU subdivision.Feb 25 2022, 9:25 PM
Kévin Dietrich (kevindietrich) claimed this task.
Kévin Dietrich (kevindietrich) added a commit: rB118a219e9dce: Fix different shading between CPU and GPU subdivision.