The new Unity animation system. It uses burst, which makes it speedy.

General Notes:

• The RigBuilder component is so called because it “Builds” a hierarchy of constraints into a set of AnimationJobs. ¹⁾
• The RigBuilder Build step happens on Awake, meaning the ordering of constraints cannot be modified at runtime by re-ordering the rig itself.^{[research needed]}
• All Constraint components must be under a Rig component.