Wrong SubSurf modifier results with inconsistent normals #58785

New Issue

Umberto Celentano · 2018-12-05T11:38:30+01:00

Umberto Celentano commented

2018-12-05 11:38:30 +01:00

System Information
Operating system: Windows 10 Enterprise Version 1803
Graphics card: 2 x GTX1080 ti

Blender Version
Broken:
blender2.8, 2018-12-05

From latest builds subsurf modifier make a wrong subdivision of geometry as displayed in the attached files.
Before 18/20 November the behaviour of subsurf modifier was ok.
I am sure because I did an animation on that date and the subdivided vase was ok.

Best regards,

Umberto

ceramic.blend

**System Information** Operating system: Windows 10 Enterprise Version 1803 Graphics card: 2 x GTX1080 ti **Blender Version** Broken: blender2.8, 2018-12-05 From latest builds subsurf modifier make a wrong subdivision of geometry as displayed in the attached files. Before 18/20 November the behaviour of subsurf modifier was ok. I am sure because I did an animation on that date and the subdivided vase was ok. Best regards, Umberto ![279.jpg](https://archive.blender.org/developer/F5832581/279.jpg) ![280.jpg](https://archive.blender.org/developer/F5832583/280.jpg) [ceramic.blend](https://archive.blender.org/developer/F5832678/ceramic.blend)

Umberto Celentano commented

2018-12-05 11:38:30 +01:00

Added subscriber: @umbiased

blender-admin commented

2018-12-05 11:38:30 +01:00

#61026 was marked as duplicate of this issue

Brecht Van Lommel commented

2018-12-05 11:39:36 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2018-12-05 11:39:36 +01:00

Thanks for the report, but we need a .blend file to reproduce the problems.

Umberto Celentano commented

2018-12-05 11:42:43 +01:00

Hi Bretch,
sorry, I forgot to add it.
Now I added it to original post.

Have a great day,

Umberto

Hi Bretch, sorry, I forgot to add it. Now I added it to original post. Have a great day, Umberto

Sergey Sharybin was assigned by Brecht Van Lommel

2018-12-05 12:01:53 +01:00

Umberto Celentano commented

2018-12-05 12:28:02 +01:00

Hi guys,
as reported by a my friend the recalc of the outside normals solve the problem.
So at this point I am not sure if it's a bug or something else.

Hi guys, as reported by a my friend the recalc of the outside normals solve the problem. So at this point I am not sure if it's a bug or something else.

Brecht Van Lommel commented

2018-12-05 12:35:19 +01:00

Normally that should not affect the subdivision result, so still seems like a bug.

Sergey Sharybin commented

2018-12-05 14:43:47 +01:00

OpenSubdiv expects topology to be ordered in an uniform manner. This is exactly what's happening when you invoke "Make normals consistent".

We would need to do some sort of ordering before sending topology to OpenSubdiv, but first we need to have topology cache implemented, to reduce penalty which will be brought by the orientation process.

OpenSubdiv expects topology to be ordered in an uniform manner. This is exactly what's happening when you invoke "Make normals consistent". We would need to do some sort of ordering before sending topology to OpenSubdiv, but first we need to have topology cache implemented, to reduce penalty which will be brought by the orientation process.

Umberto Celentano commented

2018-12-06 14:55:56 +01:00

Hi Sergey,
thank you so much for your clear answer.

Hi Sergey, thank you so much for your clear answer.

Sergey Sharybin commented

2019-01-31 09:37:16 +01:00

Added subscribers: @Visualizer420, @WilliamReynish, @Sergey

Sergey Sharybin changed title from ~~Wrong mesh subdivision~~ to Wrong mesh subdivision with inconsistent normals

2019-01-31 09:37:28 +01:00

Sergey Sharybin was unassigned by Dalai Felinto

2019-12-23 16:35:42 +01:00

Germano Cavalcante commented

2020-02-03 19:16:27 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-02-03 19:16:27 +01:00

Marking as a Bug, but given the time this report is open, I fear it will be a Known Issue.

Marking as a `Bug`, but given the time this report is open, I fear it will be a `Known Issue`.

Campbell Barton changed title from ~~Wrong mesh subdivision with inconsistent normals~~ to Wrong SubSurf modifier results with inconsistent normals

2020-09-23 02:17:00 +02:00

Philipp Oeser removed the

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Wrong SubSurf modifier results with inconsistent normals #58785