Mirrored meshes with activated Auto-Smooth have wrong normals in 3.5 when imported from 3.4.1 #106948

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CUBEinTHEmiddle · 2023-04-14T14:21:08+02:00

CUBEinTHEmiddle commented

2023-04-14 14:21:08 +02:00

System Information
Operating system: Windows 11 Pro
Graphics card: GeForce RTX 3090

Blender Version
Broken: (3.5.0, 1be25cfff1, master, 2023-03-29)
Worked: (3.4.1, master)

Short description of error
Mesh objects who are mirrored with the mirror modifier and have activated the Auto-Smooth option created in blender 3.4.1 cannot be properly appended or be used by simply opening the older blend-files in Blender 3.5. The normals on the mirrored side look broken. (see attached file) These objects are working fine in 3.4.1.

Exact steps for others to reproduce the error

Open a blend-file or append a mesh with an object who is already mirrored (mirror modifier) and Auto-Smooth option activated (created in Blender 3.4.1 or earlier) in the current master 3.5.0.

Result: The normals on the mirrored side are not working properly. The file I attached to this bug report contains a mesh I created in 3.4.1 and appended it to 3.5.

What I tried so far:

Apply the modifier with activated Auto-Smooth option = Normals on the mirrored side are still broken
Deactivate Auto-Smooth and apply mirror modifier and activate Auto-Smooth at the end = Normals work on the mirrored mesh side
Delete the mirror modifier, deactivate Auto-Smooth, create a new mirror modifier and activate Auto-Smooth = Normals on the mirrored side are still broken
Append a mesh who wasn't mirrored in older Blender versions, but also has activated Auto-Smooth = Normals are broken on the mirrored side if you use the mirror modifier
Reproducing the problem directly in Blender 3.5 is not possible. All my meshes I created in 3.5 are mirrored like expected and the mirrored mesh normals are looking fine.

By the way, in front of all this I already tried to recalculate the normals from the older Blender Versions, but this also didn't work out.

Can someone of you confirm this?

Thank you in advance! :)

**System Information** Operating system: Windows 11 Pro Graphics card: GeForce RTX 3090 **Blender Version** Broken: (3.5.0, 1be25cfff18b, master, 2023-03-29) Worked: (3.4.1, master) **Short description of error** Mesh objects who are mirrored with the mirror modifier and have activated the Auto-Smooth option created in blender 3.4.1 cannot be properly appended or be used by simply opening the older blend-files in Blender 3.5. The normals on the mirrored side look broken. (see attached file) These objects are working fine in 3.4.1. **Exact steps for others to reproduce the error** 1. Open a blend-file or append a mesh with an object who is already mirrored (mirror modifier) and Auto-Smooth option activated (created in Blender 3.4.1 or earlier) in the current master 3.5.0. Result: The normals on the mirrored side are not working properly. The file I attached to this bug report contains a mesh I created in 3.4.1 and appended it to 3.5. What I tried so far: 1. Apply the modifier with activated Auto-Smooth option = Normals on the mirrored side are still broken 2. Deactivate Auto-Smooth and apply mirror modifier and activate Auto-Smooth at the end = Normals work on the mirrored mesh side 3. Delete the mirror modifier, deactivate Auto-Smooth, create a new mirror modifier and activate Auto-Smooth = Normals on the mirrored side are still broken 4. Append a mesh who wasn't mirrored in older Blender versions, but also has activated Auto-Smooth = Normals are broken on the mirrored side if you use the mirror modifier 5. Reproducing the problem directly in Blender 3.5 is not possible. All my meshes I created in 3.5 are mirrored like expected and the mirrored mesh normals are looking fine. By the way, in front of all this I already tried to recalculate the normals from the older Blender Versions, but this also didn't work out. Can someone of you confirm this? Thank you in advance! :)

Auto Smooth Mirror Bug.jpg

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Auto Smooth Mirror Bug.blend

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CUBEinTHEmiddle added the

labels 2023-04-14 14:21:09 +02:00

Germano Cavalcante commented

2023-04-14 22:38:08 +02:00

I can't replicate the problem and the file you provided is already in version 3.5.
Could you provide the file in version 3.4 that can be used to reproduce the problem?

I can't replicate the problem and the file you provided is already in version 3.5. Could you provide the file in version 3.4 that can be used to reproduce the problem?

Germano Cavalcante added

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Needs Information from User

and removed

Status

Needs Triage

labels 2023-04-14 22:38:17 +02:00

CUBEinTHEmiddle commented

2023-04-17 12:47:14 +02:00

Sorry, I had accidentally applied the modifier in the first file I uploaded. But the result is the same.

I attached you a fresh 3.5 file, the original 3.4.1 file and a screenshot of how it looks in 3.4.1. You can see that the normals in 3.4.1 look like expected. The normals on the mirrored side are fine.

Update:
Requierement: Auto-Smooth activated and mirror modifier active. I think important is, that this all was activated in 3.4.1 or earlier.

Open 3.4.1 file in 3.4.1 = normals correct
Open 3.4.1 file in 3.5 = normals are incorrect
Open 3.5 file in 3.4.1 = normals correct
Open 3.5 file in 3.5 = normals incorrect

I use the NVIDIA Studio Driver (531.61), maybe this is relevant. If you need additional information, feel free to get in touch.

Thank you!

Sorry, I had accidentally applied the modifier in the first file I uploaded. But the result is the same. I attached you a fresh 3.5 file, the original 3.4.1 file and a screenshot of how it looks in 3.4.1. You can see that the normals in 3.4.1 look like expected. The normals on the mirrored side are fine. Update: Requierement: Auto-Smooth activated and mirror modifier active. I think important is, that this all was activated in 3.4.1 or earlier. Open 3.4.1 file in 3.4.1 = normals correct Open 3.4.1 file in 3.5 = normals are incorrect Open 3.5 file in 3.4.1 = normals correct Open 3.5 file in 3.5 = normals incorrect I use the NVIDIA Studio Driver (531.61), maybe this is relevant. If you need additional information, feel free to get in touch. Thank you!

Auto Smooth Mirror Bug_3-4-1-file.blend

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Screenshot_B-3-4-1.jpg

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Auto Smooth Mirror Bug_3-5-file.blend

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nikneknik commented

2023-04-17 13:27:30 +02:00

I see the problem.
I opened "Auto Smooth Mirror Bug_3-4-1-file.blend" :
In Blender 3.0 = Everything looks fine
In Blender 3.5 = Unfortunately the surface of the mirrored object is buggy.

See attached screenshot

I see the problem. I opened "Auto Smooth Mirror Bug_3-4-1-file.blend" : In Blender 3.0 = Everything looks fine In Blender 3.5 = Unfortunately the surface of the mirrored object is buggy. See attached screenshot

mirrorproblem_blender_3_5.JPG

134 KiB

Germano Cavalcante commented

2023-04-17 17:20:33 +02:00

I reproduced this bug in the latest official release, but not the latest daily build, so it appears the bug has been fixed already.

The fix is most likely listed in one of the items to backport in the upcoming 3.5 fix release:
#106258

For now, you can use the the latest 3.6 daily build: https://builder.blender.org/download/

If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.

I reproduced this bug in the latest official release, but not the latest daily build, so it appears the bug has been fixed already. The fix is most likely listed in one of the items to backport in the upcoming 3.5 fix release: https://projects.blender.org/blender/blender/issues/106258 For now, you can use the the latest 3.6 daily build: https://builder.blender.org/download/ If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.

Germano Cavalcante closed this issue

2023-04-17 17:20:35 +02:00

Blender Bot added

Status

Archived

and removed

Status

Needs Information from User

labels 2023-04-17 17:20:36 +02:00

CUBEinTHEmiddle commented

2023-04-26 15:32:13 +02:00

The issue is solved in Blender 3.5.1