Joint stiffness specifies a joint’s resistance to rotation during inverse kinematics (IK) posing. In animation terminology, this type of effect is called an ease-in. For example, an elbow does not snap straight, but gradually slows down as the lower arm aligns with the upper arm. For most living creatures, when a joint rotates as far as it can, it tends to slow down or dampen before reaching its limit. Depending on the strength and range you set, a joint with dampening will not reach its limit boundary unless forced. Instead of the joint abruptly stopping when it reaches its limits, you can use damping to slow it down smoothly. Joint damping applies resistance to a joint as it approaches its joint limits. The damping and stiffness values let you specify how joints behave when posed by an IK handle. You can set the damping and stiffness for joints that are influenced by IK.
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