Inherits from Joint
The HingeJoint groups together 2 rigid bodies, constraining them to move like connected by a hinge.
This joint is great for, well, doors, but can also be used to model chains, etc...
The HingeJoint has a motor which can be used to make the hinge spin around the joints axis. A spring which attempts to reach for a target angle by spinning around the joints axis. And a limit which constrains the joint angle.