Adding IK constraint with target and pole over subdivided bone chain don't bend


  1. Add single bone
  2. Subdivide(W) in two
  3. Extrude from final tail the target and clear parent
  4. Add new pole bone in front of first joint
  5. Add IK constraint with target. With this configuration the ik works well
  6. When pole bone is added in IK constraint the joint don't bend

The bones transformations arent blocked in bone panel. The same configuration with extruded bones work well. Where is the blocking configuration option?

Blend file


1 Answer 1


Yep. This is a bug with the Armature system and may be worth reporting. I think the issue is that it doesn't know which side of the bone is supposed to face the pole target.

However, if you rotate the IK bone after moving the target bone, the IK bone will snap to position, and work.


move target bone


enter image description here

  • $\begingroup$ Thank you @CharlesL this way fix the constraint. The bug is reported and confirmed by developers $\endgroup$
    – Luis
    Commented Nov 18, 2014 at 19:28

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