mirrored mesh flip normals

[blancgoat]

#2252 maybe same issue

Describe the bug
When mirroring a mesh connected to an armature, the normals are also flipped upon export.

To Reproduce
Steps to reproduce the behavior:

1. Import a mesh. call it A
2. Duplicate mesh A. call it B
3. Create an armature and connect it to the modifier of mesh A
4. Duplicate mesh A and mirror it. call it A` (In the example file, scale x to -1)
5. Duplicate mesh B and mirror it. call it B`
6. Export it as a glTF file and then import it again.

Expected behavior
The normals of the original A, A`, B, B`, and the imported ones should be the same.
but A` isn't same.

Screenshots

.blend file/ .gltf (mandatory)
test.zip

Version

• OS: windows 11
• Blender Version 4.2.5

Additional context
I tried to help resolve the issue, but it wasn't easy. When I attempted it in the __get_normals() (gltf2_blender_gather_primitives_extract.py), the texture flip succeeded, but the normals remained flipped, so I suspect this might not be the solution.

[julienduroure]

Confirmed