Bug with 4.2 Smoothing Modifier smoothing result, compared to old smoothing in 4.0. #127694

New Issue

Synced3D · 2024-09-16T14:30:44+02:00

Synced3D commented

2024-09-16 14:30:44 +02:00

System Information
Operating system: Windows-11-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 561.09

Blender Version
Broken: version: 4.2.1 LTS, branch: blender-v4.2-release, commit date: 2024-08-19 11:21, hash: 396f546c9d82
Worked: (newest version of Blender that worked as expected)

Short description of error
With the new smoothing as modifier, compared to the old smoothing workflow, I am running into multiple issues that lead to bad smoothing results, especially when working with smoothing and other modifiers at the same time.

In the attached files you find a blend file that includes smoothing together with a bevel modifier, using weighted edges and hardened normals. I also add a screenshot of the same project file opened in 4.0.1 (left) where it is smoothed correctly and 4.2.1 (right) with broken smoothing.

Exact steps for others to reproduce the error

Shade object smooth
Add bevel modifier
Set bevel modifier to weight and width; enable harden normals
set weight on specific edges

Overall Feedback - Next to this fundamental smoothing issue, the new workflow overall is terrible for bigger projects, especially for backwards compatibility if you have hundreds of objects in a scene.

Sadly me and my entire team at work do avoid switching from 4.01 to 4.2.1 because of exactly this reason.

I personally don´t see any advantage at all of having smoothing as a modifier. In my opinion it creates more steps and unnecessary work, compared to the "good old" smoothing workflow. As far as I can tell, me and my team at work are by far not the only ones in the blender community who see it this way.

Please consider changing the smoothing workflow back to how it was and always has worked through the last years.

Other than that, keep up the great work at Blender! I´m a Blender Artist for more than 17 years and you guys enabled my career with that! Thank you!

**System Information** Operating system: Windows-11-10.0.22631-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 561.09 **Blender Version** Broken: version: 4.2.1 LTS, branch: blender-v4.2-release, commit date: 2024-08-19 11:21, hash: `396f546c9d82` Worked: (newest version of Blender that worked as expected) **Short description of error** With the new smoothing as modifier, compared to the old smoothing workflow, I am running into multiple issues that lead to bad smoothing results, especially when working with smoothing and other modifiers at the same time. In the attached files you find a blend file that includes smoothing together with a bevel modifier, using weighted edges and hardened normals. I also add a screenshot of the same project file opened in 4.0.1 (left) where it is smoothed correctly and 4.2.1 (right) with broken smoothing. **Exact steps for others to reproduce the error** - Shade object smooth - Add bevel modifier - Set bevel modifier to weight and width; enable harden normals - set weight on specific edges Overall Feedback - Next to this fundamental smoothing issue, the new workflow overall is terrible for bigger projects, especially for backwards compatibility if you have hundreds of objects in a scene. Sadly me and my entire team at work do avoid switching from 4.01 to 4.2.1 because of exactly this reason. I personally don´t see any advantage at all of having smoothing as a modifier. In my opinion it creates more steps and unnecessary work, compared to the "good old" smoothing workflow. As far as I can tell, me and my team at work are by far not the only ones in the blender community who see it this way. Please consider changing the smoothing workflow back to how it was and always has worked through the last years. Other than that, keep up the great work at Blender! I´m a Blender Artist for more than 17 years and you guys enabled my career with that! Thank you!

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Synced3D added the

labels 2024-09-16 14:30:45 +02:00

Mattis-Vossmeier commented

2024-09-16 16:20:58 +02:00

Thanks for the report. This issue seems to be a feature request, not a bug.

You could try to increase the angle value of the smooth by angle modifier or completly disable it (as you already use the shade smooth option on the object) to get similar results in version 4.2 as in 4.0 (see image).

For user requests and feedback, please use other channels: https://developer.blender.org/docs/handbook/communication/user_feedback/

For more information on why this isn't considered a bug, visit: https://developer.blender.org/docs/handbook/bug_reports/not_a_bug/

Thanks for the report. This issue seems to be a feature request, not a bug. You could try to increase the angle value of the smooth by angle modifier or completly disable it (as you already use the shade smooth option on the object) to get similar results in version 4.2 as in 4.0 (see image). For user requests and feedback, please use other channels: https://developer.blender.org/docs/handbook/communication/user_feedback/ For more information on why this isn't considered a bug, visit: https://developer.blender.org/docs/handbook/bug_reports/not_a_bug/

Screenshot.png

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Iliya Katushenock commented

2024-09-16 17:17:00 +02:00

It seems you saved your file in 4.2 with applied modifier, after that you opened file in 4.0 and change modifiers to achieve the same result as before, but now file contains unused crease_edge and sharp_edge which is meaningless in 4.0, and now when you open file in 4.2 again this attributes makes things different compare in older version.
Can you test your file if you'll clrear unused attribtes in 4.0 and open this in 4.2?

It seems you saved your file in 4.2 with applied modifier, after that you opened file in 4.0 and change modifiers to achieve the same result as before, but now file contains unused `crease_edge` and `sharp_edge` which is meaningless in 4.0, and now when you open file in 4.2 again this attributes makes things different compare in older version. Can you test your file if you'll clrear unused attribtes in 4.0 and open this in 4.2?

Iliya Katushenock added

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Bug with 4.2 Smoothing Modifier smoothing result, compared to old smoothing in 4.0. #127694