Rigify Wolf Meta Rig Bone Issue #92452
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Reference: blender/blender-addons#92452
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.13
Blender Version
Broken: version: 2.93.5, branch: master, commit date: 2021-10-05 12:04, hash:
blender/blender@a791bdabd0Short description of error
Wolf Rigify meta rig has a reversed bone.
Exact steps for others to reproduce the error
Upon generation of the Wolf Rig in Rigify one bone in the spine, "spine.006", has the wrong axis orientation which causes the rig to generate incorrectly. If you rotate the chest control the mesh deforms weirdly. The fix is, on the meta rig rotate spine.006 180 on the meta rig and the rig generates correctly.
Added subscriber: @Ishy123
Added subscriber: @PratikPB2123
Added subscriber: @LukasTonne
Can confirm the issue. I'm using the quadruped rig for a horse, and when the hip is twisted even slightly the spine flips around and causes this unwanted deformation on the back. The issue goes away when i set the roll value of the first spine bone to 180 (in the metarig) so the spine bones' Z axes are all aligned. I'm assuming this is caused by the StretchTo constraint.
Added subscriber: @TodorNikolov
Yes, please fix this. The meta rigs are often used by people who don't know much about rigging. You can't expect them to figure out the problem and then fiddle with bone rolls.
Changed status from 'Needs Triage' to: 'Confirmed'
Closed as duplicate of #95864
Added subscriber: @angavrilov
No, this is caused by roll singularity around exactly -Y causing the 180 degree twist, which then hits the B-Bone twist calculation singularity. The solution is to avoid exactly aligning any spine or tail bones to the world Y axis.