A Short Intro to Constraints
The most basic constraint is the distance constraint
It is satisfied by projecting the point onto a circle around the anchor. As with all constraints, distance constraints can be chained together
The order in which constraints are satisfied is important. If the distance constraints are first solved in one direction, and then the other, it creates a form of Inverse Kinematics called “FABRIK”, or “Forwards and Backwards Reaching Inverse Kinematics”.