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Maniphest T95273

When the spine bone is rotated, it seems that the eyes part are fixed by something even though the weights is 0 for the spine bone.
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Description

System Information
Operating system: macOS Big Sur, version 11.6.2
Graphics card: AMD Radeon R9 M295X 4 GB

Blender Version
Broken: Version 3.0.0 (3.0.0 2021-12-03)
Worked: (newest version of Blender that worked as expected)

Short description of error
When the spine bone is rotated, it seems that the eyes part are fixed by something even though the weights is 0 for the spine bone.

Exact steps for others to reproduce the error
The issue can be produced after modifying the weight of eyes part for eye_l or eye_r bone.

Event Timeline

Tiger Y (CoderTiger) created this task.Jan 28 2022, 3:59 AM
Hans Goudey (HooglyBoogly) changed the task status from Needs Triage to Needs Information from User.Jan 28 2022, 7:26 PM
Hans Goudey (HooglyBoogly) added a subscriber: Hans Goudey (HooglyBoogly).

Thanks for the report. Did you mean to attach a file? We cannot fix an issue without a file and specific steps to reproduce it.

Tiger Y (CoderTiger) added a comment.EditedJan 29 2022, 1:36 PM
In T95273#1297207, @Hans Goudey (HooglyBoogly) wrote:

Thanks for the report. Did you mean to attach a file? We cannot fix an issue without a file and specific steps to reproduce it.

Thank you for your reply. I exported the model as an fbx file and compressed it into a zip file. Please check the attachment.

man_test.fbx.zip2 MBDownload

Reproduce the issue like below,

  1. import man_test.fbx.
  2. choose "Pose Mode".
  3. rotate one of the spine bones.
Pratik Borhade (PratikPB2123) changed the task status from Needs Information from User to Needs Triage.Apr 26 2022, 1:29 PM
Germano Cavalcante (mano-wii) closed this task as Archived.Apr 26 2022, 11:49 PM
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

This happens because the vertices of the eyes have no assigned weight. So no bone controls them.
The problem is not in the FBX importer but in the .fbx file itself.