Limber is an IK system for After Effects that uses shape layers to make customizable limbs for character animation. Limber has controls for styling the shape and colours, dynamically preventing animation ‘pops’, smoothly blending between IK and FK, and swapping limbs for different types.

You animate using familiar controller layers for the hip and ankle points of your limb. If you want to use FK, simply generate an FK controller, re-parent your hand or foot layer to the new controller, and dial in the FK rotation values you need – perfect for swinging arms in a walk cycle.