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Maniphest T94018

Blender FBX Export/Import Bone detachment
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Description

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: rB75f5edcaf338
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.

Related Objects

Event Timeline

Philip (DrPhil) created this task.Dec 13 2021, 2:54 PM
Philip (DrPhil) updated the task description. (Show Details)
Philipp Oeser (lichtwerk) edited projects, added Add-ons (BF-Blender); removed BF Blender.Jan 31 2022, 12:15 PM
Omar Emara (OmarSquircleArt) changed the task status from Needs Triage to Needs Information from User.Mar 8 2022, 11:10 AM
Omar Emara (OmarSquircleArt) added a subscriber: Omar Emara (OmarSquircleArt).

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 (DrPhil) added a comment.Mar 8 2022, 1:01 PM

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 (OmarSquircleArt) added a comment.Mar 8 2022, 2:37 PM

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 (DrPhil) added a comment.EditedMar 8 2022, 3:34 PM

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 (OmarSquircleArt) changed the task status from Needs Information from User to Needs Triage.Mar 8 2022, 3:49 PM
Omar Emara (OmarSquircleArt) changed the task status from Needs Triage to Needs Information from User.Mar 8 2022, 4:53 PM

There is a long list of known issues and limitations for FBX IO T68575, 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 (OmarSquircleArt) closed this task as Archived.Jun 8 2022, 10:18 AM

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.