Invalid Retarget transformation on Armature.offset.set() for movement scaling & rotation

[ArsenicBismuth]

I'm using the 003_retarget_and_springs.html example with a custom mixamoRig model. The tall/left model is the source, while the short/right model is the target.

If I remove the arm.offset.set() line, this is what I get:

2023-08-19.00-58-46.mp4

Meanwhile, after re-enabling the line:

2023-08-19.00-59-18-00.00.00.000-00.00.08.244.mp4

The target is actually moving downward just a tiny bit. So here you can see that somehow that offset.set() somehow manages to:

• Rotate the armature properly, but not the movement direction (it goes downward).
• Scale the armature properly, but not the movement magnitude (it goes much slower).

To emphasize the downward movement direction, here's the clip when I set the offset without the skin.scale (so just rotation & position):

2023-08-19.16-06-39.mp4