..    TODO/Review: {{review|}}.


********************
IK Solver Constraint
********************

The *Inverse Kinematics* constraint implements the *inverse kinematics* armature
posing technique. Hence, it is only available for bones.
To quickly create an IK constraint with a target, select a bone in pose mode,
and press :kbd:`Shift-I`.

This constraint is fully documented in the
:ref:`Inverse Kinematics <bone-constraints-inverse-kinematics>` page, part of the rigging chapter.


Options
=======

.. figure:: /images/rigging_constraints_tracking_ik-solver.png

   Inverse Kinematics panel.


Target
   :ref:`ui-data-id` used to select the an armature.
Pole Target
   Object for pole rotation.
Iterations
   Maximum number of solving iterations.
Chain Length
   How many bones are included in the IK effect. Set to 0 to include all bones.

   Use Tail
      Include bone's tail as last element in chain.
   Stretch
      Enable IK stretching.
Weight
   Position
      For Tree-IK: Weight of position control for this target.
   Rotation
      Chain follow rotation of target.
Target
   Disable for targetless IK.
Rotation
   Chain follows rotation of target.

.. vimeo:: 171279647