Two Bone IK

Two Bone IK is a constraint that transforms a simple FK Hierarchy of composed of 2 bones into an inverse kinematic expression that can be control and manipulate by a Target GameObject (Hand like control) and Hint GameObject (elbow like control).

Properties	Description
Weight	The weight of the constraint. If set to 0, the constraint has no influence on the Constrained GameObjects while when set to 1, it applies full influence given the specified settings.
Root	The root of the constrained GameObject hierarchy.
Mid	The middle of the constrained GameObject hierarchy.
Tip	The last GameObject of the constrained hierarchy.
Target	The Source GameObject that acts as the chain IK target or effector.
Hint	Optional Source GameObject to control how the middle node bend normal is computed.
Maintain Target Offset	The current offset (in Position, Rotation or both) between the tip and target are maintained when not set to None
Target Position Weight	The amount in which the chain reaches to the target effector. If set to 1, the chain tries to fully reach for the target GameObject.
Target Rotation Weight	The amount in which the tip GameObject rotates to match the target GameObject rotation. If set to 1, the tip rotates to fully match it's target.
Hint Weight	The amount of influence the hint has on the configuration of the hierarchy. When set to 1, the hint fully influences the hierarchy configuration. If no hint GameObect is specified, the hint weight is ignored.