Auto Smooth vs Smooth by Angle Modifier #119633
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Reference: blender/blender#119633
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System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.61
Blender Version
Broken: version: 4.1.0 Release Candidate, branch: blender-v4.1-release, commit date: 2024-03-16 18:44, hash:
714ebd6890c2Worked: (newest version of Blender that worked as expected)
Short description of error
The Modifier Auto Smooth automatically added on object with Shade Auto-Smooth from previous Blender version doesn't have option to Ignore Sharpness, this can be confusing with the Smooth by Angle default modifier.
Exact steps for others to reproduce the error
On Blender 4.0.2, select default cube, right clic and Shade Auto Smooth, Save the Scene
Open the Scene on Blender 4.1 add an other cube, Add the Modifier Smooth by Angle on new cube
Compare 2 cube and 2 differents Modifier
Modifier Auto Smooth and Smooth by Angle are different.
May not need the Auto Smooth Modifier and only Smooth by Angle.
Hi, thanks for the report. I don't see any bug here.
Auto smoothmodifier is added through versioning code to keep the mesh normal same as in previous versions. For consistencykeep sharpcan be added but I would like to here from @HooglyBooglyYes, it's not a bug, but a possibility of future confusion.
The problem I see is why the existence of the hidden
Auto Smoothmodifier?Why not automatically add
Smooth by Angle, which is complete with theIgnore Sharpnessoption?I'm putting myself in the shoes of a user who won't see this subtlety right away, because what's left to do is delete
Auto Smoothand then addSmooth by Angle.Maybe there is one, but I don't see any reason to hide the
Ignore Sharpnessoption.This may break mesh normal/shading from files saved in previous versions (where
auto smoothproperty existed)This "auto smooth modifier" versioning code also manipulates the mesh data a bit to keep results same as 4.0/older versions. Also the modifier code is hardcoded: https://projects.blender.org/blender/blender/src/branch/main/source/blender/blenkernel/intern/mesh_legacy_convert.cc#L2327
Whereas
smooth by angleis nodegroup asset