OBJ Export: wrong normals with scaled object #96430
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Reference: blender/blender#96430
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System Information
Operating system: Linux
Graphics card:
Blender Version
Broken: 3.1
Worked: 3.0
Short description of error
When exporting an OBJ, if a mesh object has a non-trivial scaling in its world matrix, the normals are wrong
Exact steps for others to reproduce the error
Create a UV sphere, smooth shade it, scale down on one axis, say Scale X = 0.3. Export and reimport.
Added subscriber: @scurest
Added subscriber: @aras_p
Changed status from 'Needs Triage' to: 'Confirmed'
Yup, can reproduce this. Looks like the new exporter is not applying proper normal transformation math (should use inverse transpose of the matrix, and normalize the result). Will try fixing...
Added subscriber: @howardt
This looks good.
This issue was referenced by
3a1e6bc1d5This issue was referenced by
8aa365745aChanged status from 'Confirmed' to: 'Resolved'