2.77.3 Textured viewport smooth shading regression #49057

Closed
opened 7 years ago by david_black · 8 comments

System Information
Ubuntu MATE 16.04.1 64-bit
Windows 7 x64

Intel HD3000
NVIDIA GTX 580M

Blender Version
Broken: 2.77.1 (a3ce64b)
Broken: 2.77.3 (a0c1876)
Broken: 2.77.3 (040fa75)
Broken: 2.77.3 (f990518)
Working: 2.77a

Short description of error
Textured viewport shading artefacts for smooth shaded objects

Exact steps for others to reproduce the error
2.77.3 Textured viewport shading issue (enable Subsurf).blend

  • Open attached blend file
  • Without clicking any objects, navigate around textured viewport (at this point all is well)
  • Enable sphere's subsurf modifier
  • Navigate once again around textured viewport (observe cube's shading change)

Alternatively, watch a video of the issue
2.77.3 Textured viewport shading issue.mp4

How-to:
Create the issue from scratch

  • Open Blender 2.77.3
  • Set default cube to smooth shading
  • Add a sphere
  • Add a subsurf modifier to the sphere (disable subsurf for viewport)
  • Switch to textured viewport
  • Enable sphere's subsurf modifier
  • Navigate around the viewport

Originally reported as part of the bevel modifier regression bug report, now separated
Previously uploaded video highlighting the issue (part of a complex scene)
Textured viewport shading issue.mp4

Before someone mentions it :)
Normally flat objects wouldn't be smooth shaded. In the complex scene above, simple objects with smooth shading also have bevel modifiers.

Thank you

**System Information** Ubuntu MATE 16.04.1 64-bit Windows 7 x64 Intel HD3000 NVIDIA GTX 580M **Blender Version** Broken: 2.77.1 (a3ce64b) Broken: 2.77.3 (a0c1876) Broken: 2.77.3 (040fa75) Broken: 2.77.3 (f990518) Working: 2.77a **Short description of error** Textured viewport shading artefacts for smooth shaded objects **Exact steps for others to reproduce the error** [2.77.3 Textured viewport shading issue (enable Subsurf).blend](https://archive.blender.org/developer/F334660/2.77.3_Textured_viewport_shading_issue__enable_Subsurf_.blend) * Open attached blend file * Without clicking any objects, navigate around textured viewport (at this point all is well) * Enable sphere's subsurf modifier * Navigate once again around textured viewport (observe cube's shading change) Alternatively, watch a video of the issue [2.77.3 Textured viewport shading issue.mp4](https://archive.blender.org/developer/F334661/2.77.3_Textured_viewport_shading_issue.mp4) **How-to:** Create the issue from scratch * Open Blender 2.77.3 * Set default cube to smooth shading * Add a sphere * Add a subsurf modifier to the sphere (disable subsurf for viewport) * Switch to textured viewport * Enable sphere's subsurf modifier * Navigate around the viewport **Originally reported as part of the bevel modifier regression bug report, now separated** Previously uploaded video highlighting the issue (part of a complex scene) [Textured viewport shading issue.mp4](https://archive.blender.org/developer/F331465/Textured_viewport_shading_issue.mp4) **Before someone mentions it :)** Normally flat objects wouldn't be smooth shaded. In the complex scene above, simple objects with smooth shading also have bevel modifiers. Thank you
Poster

Changed status to: 'Open'

Changed status to: 'Open'
Poster

Added subscriber: @david_black

Added subscriber: @david_black
mont29 commented 7 years ago
Owner

Added subscribers: @MikeErwin, @mont29

Added subscribers: @MikeErwin, @mont29
mont29 commented 7 years ago
Owner

Looks like some bad GL state handling maybe? Disabling again subsurf, or even fully reloading the file, does not fix the issue…

@MikeErwin, maybe you want to have a look on this one?

Looks like some bad GL state handling maybe? Disabling again subsurf, or even fully reloading the file, does not fix the issue… @MikeErwin, maybe you want to have a look on this one?
Poster

In case helpful isolating commit/s that may have broken textured GL drawing.

Just discovered, enabling an OpenSubdiv compute device in user prefs, then enabling 'Use OpenSubdiv' in the sphere's subsurf modifier corrects the viewport textured GL drawing issue. Disable 'Use OpenSubdiv' in subsurf, and issue returns.

In case helpful isolating commit/s that may have broken textured GL drawing. Just discovered, enabling an OpenSubdiv compute device in user prefs, then enabling 'Use OpenSubdiv' in the sphere's subsurf modifier corrects the viewport textured GL drawing issue. Disable 'Use OpenSubdiv' in subsurf, and issue returns.
Sergey commented 7 years ago
Owner

Added subscriber: @Sergey

Added subscriber: @Sergey
Sergey commented 7 years ago
Owner

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'
Sergey closed this issue 7 years ago
Sergey self-assigned this 7 years ago
Sergey commented 7 years ago
Owner

This was actually resolved in cf53389. So thanks for the report, but it's nothing to be fixed here now :)

This was actually resolved in cf53389. So thanks for the report, but it's nothing to be fixed here now :)
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Reference: blender/blender#49057
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