Separate faces destroys custom vertex normals #61832
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Reference: blender/blender#61832
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System Information
Operating system: Windows
Graphics card: Nvidia GTX 1080
Blender Version
Broken:
2.8 git.ba6cf3cdb649-windows64
Short description of error
When using the separate operator(shortcut: p key) on a mesh with custom vertex normal data, both the original mesh and separated faces have incorrect vertex normal data.
Expected behavior- separated and original vertices should have the original custom vertex normal data.
Exact steps for others to reproduce the error
Added subscriber: @John-Porter
Added subscriber: @dfelinto
Same problem seems to happen in 2.79 (tested appending the objects from your sample file). Lowering the priority since this is not a 2.80 specific bug.
Changed status from 'Open' to: 'Archived'
That’s even no bug at all, but part of known (low priority) TODO, to support custom normals in all topology-modifying tools, modifiers, etc. Note that custom normals are not really designed to be used before some geometry changes, but rather as the last step in a modeling process. You can always use Data Transfer operator or modifier to re-create them by 'copying' those from original geometry, though.