Invalid armature (bone roll flipped?) when importing FBX 7.5 from mixamo.com #87181

New Issue

Jerome Humbert · 2021-04-03T23:29:52+02:00

Jerome Humbert commented

2021-04-03 23:29:52 +02:00

System Information
Operating system: win10
Graphics card: gtx2070

Blender Version
Broken: 2.80 and 2.92.0 (02948a2cab44)
Worked: unknown

Short description of error

Imported armature from fbx downloaded on mixamo.org has some bone with wrong roll. Same rig imported as Collada (.dae) works well.
Flipping the roll fixes the associated animations.

Exact steps for others to reproduce the error

Start Blender on empty file
Download .fbx model "Amy" from mixamo.org ( https://www.mixamo.com/#/?page=1&query=amy&type=Character ) => Ch46_nonPBR.fbx (there's also an option to download as ASCII to check content)
File > Import > FBX > Select the file, all default options (scale=1, no apply xform, etc.)
Select Armature, hide mesh (Ch46)
Observe that bone "mixamorig:LeftLeg" has strange roll -- it should immediately stand out (see screenshot)
Open Transform panel (N) and observe roll=+66deg
Change roll=-66deg and observe the bone looks aligned to all other bones

You can confirm the issue by downloading an animation from mixamo.org, like "Walking", the one for female model (red), only called "Walking" and nothing else ( https://www.mixamo.com/#/?page=1&query=walking+female&type=Motion%2CMotionPack )

This might be related to #53620 but that issue doesn't mention roll explicitly. Though I confirmed via the ASCII version that LeftLeg and other bones have some non-identity PreRotation.

I don't include a .blend file because the error is likely during the import so there's little value seeing the wrong result without a way to repro (which is given via the above steps).

**System Information** Operating system: win10 Graphics card: gtx2070 **Blender Version** Broken: 2.80 and 2.92.0 (02948a2cab44) Worked: unknown **Short description of error** Imported armature from fbx downloaded on mixamo.org has some bone with wrong roll. Same rig imported as Collada (.dae) works well. Flipping the roll fixes the associated animations. **Exact steps for others to reproduce the error** - Start Blender on empty file - Download .fbx model "Amy" from mixamo.org ( https://www.mixamo.com/#/?page=1&query=amy&type=Character ) => Ch46_nonPBR.fbx (there's also an option to download as ASCII to check content) - File > Import > FBX > Select the file, all default options (scale=1, no apply xform, etc.) - Select Armature, hide mesh (Ch46) - Observe that bone "mixamorig:LeftLeg" has strange roll -- it should immediately stand out (see screenshot) - Open Transform panel (N) and observe roll=+66deg - Change roll=-66deg and observe the bone looks aligned to all other bones You can confirm the issue by downloading an animation from mixamo.org, like "Walking", the one for female model (red), only called "Walking" and nothing else ( https://www.mixamo.com/#/?page=1&query=walking+female&type=Motion%2CMotionPack ) This *might* be related to #53620 but that issue doesn't mention roll explicitly. Though I confirmed via the ASCII version that LeftLeg and other bones have some non-identity PreRotation. I don't include a .blend file because the error is likely during the import so there's little value seeing the wrong result without a way to repro (which is given via the above steps). ![image.png](https://archive.blender.org/developer/F9919254/image.png)

Jerome Humbert commented

2021-04-03 23:29:52 +02:00

Added subscriber: @djee

Omar Emara commented

2022-03-22 10:25:48 +01:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-03-22 10:25:48 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Omar Emara commented

2022-03-22 10:25:48 +01:00

You should probably try with the import options to get correct results. I would try:

Transform > Use Pre/Post Rotation. (Try Disabling that.)
Armature > Ignore Leaf Bones / Force Connect Children / Automatic Bone Orientation. (Try Enabling those.)

You should probably try with the import options to get correct results. I would try: - Transform > Use Pre/Post Rotation. (Try Disabling that.) - Armature > Ignore Leaf Bones / Force Connect Children / Automatic Bone Orientation. (Try Enabling those.)

Omar Emara commented

2022-04-05 11:24:12 +02:00

Just a poke regarding my inquiry above, otherwise, we will have to archive this for now.

Jerome Humbert commented

2022-04-05 23:10:51 +02:00

Did you try to repro yourself with the detailed steps?

Omar Emara commented

2022-05-24 13:14:54 +02:00

I don't have a Mixamo account currently, so can't test this myself. Did what I mentioned above work?

Omar Emara commented

2022-06-08 11:24:05 +02:00

Changed status from 'Needs User Info' to: 'Archived'

Omar Emara closed this issue

2022-06-08 11:24:05 +02:00

Omar Emara commented

2022-06-08 11:24:05 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

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Invalid armature (bone roll flipped?) when importing FBX 7.5 from mixamo.com #87181