Maya USD Merge Bug for Autodesk #4402
Description
Maya 2026.2.0-8.0.pfix
MayaUSD version 0.25.5
Windows 11 enterprise
Calling the python command 'cmds.mayaUsdMergeToUsd()' produces a much larger USD export file (around 52 mb) than using the equivalent operation from the Maya USD 'Merge to USD' UI dialog options. The Python based merge seems to export additional and unnecessary scene data that the UI merge does not include. Additional flags or features might be required for that function.
Steps to reproduce:
Open a scene containing a USD skelmesh edited as maya data
Open the USD layer editor and choose 'Merge Maya Edits to USD'
Using the UI, click Merge. Filesize is ~2 mb
Undo/reload the scene
Execute this command:
cmds.mayaUsdMergeToUsd('Stage')
Compare the output file as ~52 mb
Additional comments:
Looking at the bigger file, it seems it stores the vertex information of the mesh, rather than the intention of storing the skeletal animation data in the file