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Bone roll messed up after import as FBX
Confirmed, NormalPublic


System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1660 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.09

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-05-12 23:52, hash: rB06e62adfb8f2
Worked: Never

I import an FBX in Blender. The bone roll of the fingers is broken. It is not aligned with the bone axis.
I import the same FBX in DAZ3D, and the bone roll is fine. So it must be a problem with the way that Blender handles the FBX import file.
[Please fill out a short description of the error here]

Download and import this FBX file in Blender.
Pick import settings. I have used the following:

Observe, how the bone rotation is different in comparison to the bone rotation in DAZ3D:

This is the blend file:

Please watch the animated gif to see how to reproduce the problem:

The difference between the FBX imported in DAZ3D can clearly be seen in top view:


Blender. As one can see, the rotation tool is not aligned with the bone as is in DAZ3D, so the rotation outcome in Blender is different than in DAZ3D:

I have tried the same in Unity, and in Unity is STILL looks different, so we have 3 versions of how fbx is being imported:

And so far, only the DAZ3D fbx importing works correctly.

Event Timeline

Tom Weber (tw2020) updated the task description. (Show Details)
Tom Weber (tw2020) added a comment.EditedJun 2 2021, 8:16 PM

Unity has exactely the same bug.
MoBu did, too.
In Mobu 2020, the problem is fixed.
Unity has also acknowledged the bug and has it in its bug tracker.

Adding the two as subtasks so that their files can also be checked while a fix is being worked on. Since they have different steps to redo, merging into one would be confusing.

Ankit Meel (ankitm) changed the task status from Needs Triage to Confirmed.Jun 6 2021, 9:17 PM
Pratik Borhade (PratikPB2123) changed the status of subtask T83531: FBX Export Breaks Bone Roll Values - Simple Example from Needs Triage to Needs Information from User.Jan 24 2022, 6:54 AM