public HeadIK( FullBodyIK fullBodyIK )
{
_settings = fullBodyIK.settings;
_internalValues = fullBodyIK.internalValues;
_neckBone = _PrepareBone( fullBodyIK.headBones.neck );
_headBone = _PrepareBone( fullBodyIK.headBones.head );
_leftEyeBone = _PrepareBone( fullBodyIK.headBones.leftEye );
_rightEyeBone = _PrepareBone( fullBodyIK.headBones.rightEye );
_headEffector = fullBodyIK.headEffectors.head;
_eyesEffector = fullBodyIK.headEffectors.eyes;
}