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Maniphest T91298

Alignment issue on IK-Rig - "Apply pose as rest pose" does not work either
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 462.59

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: rB02948a2cab44
Worked: (newest version of Blender that worked as expected)

Short description of error
[Right and left side of a righ with IK bone do not align correctly once mirrored on the x-axis.
The difference between right and left side only shows when fully zoomed in, but causes issues further down the line.
Visible in side-view with x-ray on, or when armature is displayed as "stick".
Only deleting the IK-Constraint from the rig, solves the issue so far, which is pointless.]

Exact steps for others to reproduce the error
[Create a rig consisting of shin, femur, foot-controller and pole target.
Set IK-Constraint on the shin bone with a chain length of 2.
In edit mode select all bones from right side and right-click, then "symmetrize" (make sure your bones are named ".R" at the end).
On the armature viewport display choose "stick".
Go to side view (x) and zoom into the knee joint as far as possible.

Going back an forth between pose-mode and edit-mode should show a noticeable jump. Applying pose as rest pose does not prevent this jump (nor do any of the other two apply-options). Comparing right and left side of the rig should show a difference in position of the knee joint. All data in the viewport object tab will be displayed as identical between right and left, though.]

Joined a blend-file here: Blend-File
Full description here: Stack Exchange
[Based on the default startup or an attached .blend file (as simple as possible)]

Event Timeline

Roman (Roro) created this task.Sep 10 2021, 12:03 AM
Roman (Roro) updated the task description. (Show Details)Sep 17 2021, 1:17 PM
Omar Emara (OmarSquircleArt) closed this task as Archived.Feb 9 2022, 2:50 PM
Omar Emara (OmarSquircleArt) added a subscriber: Omar Emara (OmarSquircleArt).

You have a dependency cycle in your rig:

OBArmature-Anatomie/Distance-Hip.R/BONE_CONSTRAINTS() depends on
OBArmature-Anatomie/Distance-Fuß.R/BONE_DONE() via 'Damped Track'
OBArmature-Anatomie/Distance-Fuß.R/BONE_READY() via 'Ready -> Done'
OBArmature-Anatomie/Distance-Fuß.R/BONE_CONSTRAINTS() via 'Constraints -> Ready'
OBArmature-Anatomie/Distance-Hip.R/BONE_DONE() via 'Damped Track'
OBArmature-Anatomie/Distance-Hip.R/BONE_READY() via 'Ready -> Done'
OBArmature-Anatomie/Distance-Hip.R/BONE_CONSTRAINTS() via 'Constraints -> Ready'

Distance-Hip.R depends on Distance-Fuß.R through the Damped Track constraint, and Distance-Fuß.R, in turn, depend on Distance-Hip.R through its Damped Track constraint.

Undefined behavior of a rig when it has dependency cycle is not a bug. There is chance it is fake/avoidable dependency cycle, but these cases are mostly known and solution for them requires bigger design reconsidrations which is outside of the scope of the bug tracker.