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Broken facial joints and shearing from spine stretch


#1

Hello, when I enable spine stretching I find my lip and eye joints move incorrectly. This happens with both spine_ik_01 and spine_ik_02.

When I looked into it a bit I noticed that spine stretching causes shear transformations down the joint chain. I’m not sure whether this is intended or whether it is the cause of the problems.

Edit: noticed this happens with neck IK stretching as well.


#2

Did you fix the lip rope scaling as indicated in these threads? This might solve the problem, or at least part of it.


#3

Thank you for the pointers. I saw variations on this were a fairly common thread topic and found a thread on spine and neck stretch here where Miquel recommended “Force uniform scaling on all joints.” Enabling that option fixed the problem so I didn’t attempt any more manual tweaks.

(I’m just using the basic lips rig, rope doesn’t play very nicely…)