Blender FBX Export/Import Bone detachment #94018

New Issue

Philip · 2021-12-13T14:54:01+01:00

Philip commented

2021-12-13 14:54:01 +01:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 466.77

Blender Version
Broken: version: 3.1.0 Alpha, branch: master, commit date: 2021-11-01 19:48, hash: blender/blender@75f5edcaf3
Worked: (newest version of Blender that worked as expected)

Short description of error
Problem since forever in blender - importing fbx make it bones detached that prevents from use any sort of IK. Even if file was created in blender, fully rigged with controls and working IK, after exporting it, and importing in the same blend file whole rigg is imported wrong and not connected.

Exact steps for others to reproduce the error
Make model, make armature, rig it, make IK, export it to fbx, import it and thats all
Cant put blend file because nda but its simple to do and it never worked.

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 466.77 **Blender Version** Broken: version: 3.1.0 Alpha, branch: master, commit date: 2021-11-01 19:48, hash: `blender/blender@75f5edcaf3` Worked: (newest version of Blender that worked as expected) **Short description of error** Problem since forever in blender - importing fbx make it bones detached that prevents from use any sort of IK. Even if file was created in blender, fully rigged with controls and working IK, after exporting it, and importing in the same blend file whole rigg is imported wrong and not connected. **Exact steps for others to reproduce the error** Make model, make armature, rig it, make IK, export it to fbx, import it and thats all Cant put blend file because nda but its simple to do and it never worked. ![image.png](https://archive.blender.org/developer/F12737170/image.png)

Philip commented

2021-12-13 14:54:02 +01:00

Added subscriber: @DrPhil

Omar Emara commented

2022-03-08 11:10:44 +01:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-03-08 11:10:44 +01:00

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

Omar Emara commented

2022-03-08 11:10:44 +01:00

I can not replicate the issue on a simple file. So can you attach a minimal file that reproduces the issue?
Does the issue happen only when there is an IK constraint? Is the offset in the hand the issue you are talking about?

I can not replicate the issue on a simple file. So can you attach a minimal file that reproduces the issue? Does the issue happen only when there is an IK constraint? Is the offset in the hand the issue you are talking about?

Philip commented

2022-03-08 13:01:16 +01:00

After import FBX into Blender I believe importer doesn't load data about children-parent connection. There is force connection that we can select but it work more like a guess than real data import. Simply when we do armature we describe what is parent and what is child and how IK should behave. If we import same file into blender its not importing this data.

Omar Emara commented

2022-03-08 14:37:21 +01:00

Right. I don't think Blender supports constraints like IK for FBX regardless, so this is more of a limitation.
Is the issue about such limitations or something more?

Right. I don't think Blender supports constraints like IK for FBX regardless, so this is more of a limitation. Is the issue about such limitations or something more?

Philip commented

2022-03-08 15:34:16 +01:00

This one is major that don't allow many users to use 3rd party models right away without spending additional time to reconnect and repair armature. Another one is that sizes and orientation of the bones are not correctly imported. I created topic about it here: https://developer.blender.org/T72386

Omar Emara commented

2022-03-08 15:49:49 +01:00

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

Omar Emara commented

2022-03-08 16:53:33 +01:00

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

Omar Emara commented

2022-03-08 16:53:33 +01:00

There is a long list of known issues and limitations for FBX IO #68575, so it is unlikely that new additions like IK constraints will be added soon.
If there is an issue that is unrelated to constraints, we require a minimal blend file to replicate the issue and investigate it. Can you do that?
If not, we will just consider this to be a to-do and will be handled outside of this bug tracker.

There is a long list of known issues and limitations for FBX IO #68575, so it is unlikely that new additions like IK constraints will be added soon. If there is an issue that is unrelated to constraints, we require a minimal blend file to replicate the issue and investigate it. Can you do that? If not, we will just consider this to be a to-do and will be handled outside of this bug tracker.

Omar Emara commented

2022-06-08 10:18:24 +02:00

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

Omar Emara closed this issue

2022-06-08 10:18:24 +02:00

Omar Emara commented

2022-06-08 10:18:24 +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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Blender FBX Export/Import Bone detachment #94018