Subdivision mangling texture UVs and Vertex Colors in 2.80 #59042

New Issue

Zauber Paracelsus · 2018-12-08T21:25:31+01:00

Zauber Paracelsus commented

2018-12-08 21:25:31 +01:00

System Information
Operating system: Windows 8.1 Pro 64bit
Graphics card: GeForce GTX 950

Blender Version
Broken: 2.80 beta 74db65e542
Worked: 2.79 5bd8ac9

Short description of error
Subdivision Surface is mangling texture UVs and vertex colors that previously rendered correctly. In the case of vertex colors, it looks like the color values are being applied to the wrong vertices in each triangle?

Exact steps for others to reproduce the error
The .blend file below demonstrates the problem. It works correctly in blender 2.79, but is incorrect in 2.80
Subdivision_BadUVs.blend

**System Information** Operating system: Windows 8.1 Pro 64bit Graphics card: GeForce GTX 950 **Blender Version** Broken: 2.80 beta 74db65e5424 Worked: 2.79 5bd8ac9 **Short description of error** Subdivision Surface is mangling texture UVs and vertex colors that previously rendered correctly. In the case of vertex colors, it looks like the color values are being applied to the wrong vertices in each triangle? ![Subdivision_BadUVs.png](https://archive.blender.org/developer/F5891133/Subdivision_BadUVs.png) **Exact steps for others to reproduce the error** The .blend file below demonstrates the problem. It works correctly in blender 2.79, but is incorrect in 2.80 [Subdivision_BadUVs.blend](https://archive.blender.org/developer/F5891064/Subdivision_BadUVs.blend)

Zauber Paracelsus commented

2018-12-08 21:25:31 +01:00

Added subscriber: @ZauberParacelsus

Zauber Paracelsus changed title from ~~Subdivision mangling texture UVs in 2.80~~ to Subdivision mangling texture UVs and Vertex Colors in 2.80

2018-12-08 21:38:10 +01:00

Jordi Santini commented

2018-12-21 09:40:58 +01:00

Added subscriber: @Darksunrise

Sergey Sharybin was assigned by Sebastian Parborg

2019-01-04 17:43:17 +01:00

Sergey Sharybin commented

2019-01-15 16:11:31 +01:00

The vertex colors part of the issue was fixed in e551ddf712, as a part of #60393.

UV coordinates are different due to difference in interpolation. Not sure if there is a trick to make it match closer old subdivision code yet.

The vertex colors part of the issue was fixed in e551ddf712, as a part of #60393. UV coordinates are different due to difference in interpolation. Not sure if there is a trick to make it match closer old subdivision code yet.

Sergey Sharybin commented

2019-01-25 16:16:24 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2019-01-25 16:16:24 +01:00

Sergey Sharybin commented

2019-01-25 16:16:24 +01:00

Had a closer look into the UV interpolation modes in OpenSubdiv. Unfortunately, the current one is the closest one to what we had before. Can't say one of them is better or worse than another, is just different. This means that for new projects it's not so much of a deal, is just the old ones will have mapping working different.

This one of the things which we need to accept as a backward compatibility breaking when going 2.80..

Thanks for the report, closing it now.

Had a closer look into the UV interpolation modes in OpenSubdiv. Unfortunately, the current one is the closest one to what we had before. Can't say one of them is better or worse than another, is just different. This means that for new projects it's not so much of a deal, is just the old ones will have mapping working different. This one of the things which we need to accept as a backward compatibility breaking when going 2.80.. Thanks for the report, closing it now.

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Subdivision mangling texture UVs and Vertex Colors in 2.80 #59042