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Here is a very simple leg.

enter image description here

Leg.lower.L has an ik constraint applied, of chain length 2.

enter image description here

Foot.L has no ik applied but copies its rotation from IK_Foot.L

As discussed here here this enables the Inverse Kinematics fields of Leg.lower.L & Leg.upper.L

I want to limit the rotations of the upper leg hat may be caused by ik. To test the extreme case, suppose I attempt to prohibit rotations of Leg.upper.L completely. I have applied Lock IK for X, Y & Z.

enter image description here

However, as you can see, those locks are ignored.

enter image description here

Why are the locks having no effect?

Blender v2.83.0 on Linux

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A Pole Target interferes or takes president over the Inverse Kinematics constraining in the Bone Properties tab for the last bone in the chain.

Some info here and (more or less accurate info with a bunch of links) here

I think that sadly there aren't any (easy) workarounds. Non that I'm aware of in any case.

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  • $\begingroup$ That bug report & attached demo file describes my problem exactly. Seems you have to tiptoe around stuff that broken when trying to use ik. $\endgroup$ – rgh Jul 18 '20 at 13:05
  • $\begingroup$ Yes, it helps to be aware of it. : ) I guess it is an old problem rooted in certain foundations that makes it hard to deal with. $\endgroup$ – Fjoersteller Jul 18 '20 at 13:51

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