Armature combined with subdivision incorrect normals #88681

New Issue

James · 2021-05-30T13:31:18+02:00

James commented

2021-05-30 13:31:18 +02:00

System Information
Operating system: Windows 10 Pro
Graphics card: GeForce 1050ti

Blender Version
Broken: 2.82 (broken in a different way), 2.83.14, 2.92, 2.93 beta, 3.0 alpha
Worked: 2.79b (important is working in 2.81)
When using an armature modifier and subdivision modifier on the same mesh you get the wrong normals. If the armature is applied to the mesh then the subdivision normals are correct. The problem with the armature and subdivision together only applies if the armature is posed.

This broke between good ba1e9ae473 and bad da6929488a, probably 9516921c05

I think that a bug has come into 2.82 a fix has been applied but it has broken it differently. So between 2.81 and 2.82 something broke, then a fix was put in that is still broken but in a different way. So 2.81 is the good version.

Create a mesh and create an armature on the mesh. Add a subdivision modifier. Make sure the armature has a pose. Show the normals.
The consequences will mean that the surfaces are wrong and the subsurface and general render will just look wrong.
Good:

Bad:

blender2_79b.blend

blender2_92.blend

**System Information** Operating system: Windows 10 Pro Graphics card: GeForce 1050ti **Blender Version** Broken: 2.82 (broken in a different way), 2.83.14, 2.92, 2.93 beta, 3.0 alpha Worked: 2.79b (important is working in 2.81) When using an armature modifier and subdivision modifier on the same mesh you get the wrong normals. If the armature is applied to the mesh then the subdivision normals are correct. The problem with the armature and subdivision together only applies if the armature is posed. This broke between good ba1e9ae4733a and bad da6929488a64, probably 9516921c05 I think that a bug has come into 2.82 a fix has been applied but it has broken it differently. So between 2.81 and 2.82 something broke, then a fix was put in that is still broken but in a different way. So 2.81 is the good version. Create a mesh and create an armature on the mesh. Add a subdivision modifier. Make sure the armature has a pose. Show the normals. The consequences will mean that the surfaces are wrong and the subsurface and general render will just look wrong. Good: ![good.png](https://archive.blender.org/developer/F10149097/good.png) Bad: ![bad.png](https://archive.blender.org/developer/F10149095/bad.png) [blender2_79b.blend](https://archive.blender.org/developer/F10149099/blender2_79b.blend) [blender2_92.blend](https://archive.blender.org/developer/F10149100/blender2_92.blend)

James commented

2021-05-30 13:31:18 +02:00

Added subscriber: @James8569

Philipp Oeser commented

2021-06-01 15:37:50 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-06-01 15:37:50 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser self-assigned this 2021-06-01 15:37:50 +02:00

Philipp Oeser commented

2021-06-01 15:37:50 +02:00

Can confirm, will check

Philipp Oeser removed their assignment 2021-06-01 16:20:14 +02:00

Philipp Oeser commented

2021-06-01 16:20:14 +02:00

Added subscriber: @fclem

Philipp Oeser commented

2021-06-01 16:20:14 +02:00

Pretty sure this broke with 9516921c05 ?

The consequences will mean that the surfaces are wrong and the subsurface and general render will just look wrong.

cannot reproduce this though, for me renders looks the same (and it is just the overlay normals being drawn wrong)

CC @fclem

Pretty sure this broke with 9516921c05 ? > The consequences will mean that the surfaces are wrong and the subsurface and general render will just look wrong. cannot reproduce this though, for me renders looks the same (and it is just the overlay normals being drawn wrong) CC @fclem

Philipp Oeser changed title from ~~Amarture combined with subdivision incorrect normals~~ to Armature combined with subdivision incorrect normals

2021-06-01 17:00:59 +02:00

James commented

2021-06-03 18:53:18 +02:00

Have you been able to cross-compare between the last working/non-working versions? The renders had different light responses but they are subtle probably because the normals are sweeping across rather than being in opposing directions.

James commented

2021-06-04 01:26:32 +02:00

I have tried to use different materials and configurations and it does not appear to affect the render output so that must have been a coincidence.

Philipp Oeser removed the

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Armature combined with subdivision incorrect normals #88681