The user can create a force entity as follows.
•Joint
•Joint: Selects a revolute joint or a cylindrical joint.
•Point, Direction
•Point: Selects a point on two bodies to define the location of rotational spring force.
•Direction: Defines the direction of z-axis of rotational spring force.
•Body, Body, Point, Direction
•Body: Selects a base body of rotational spring force.
•Body: Selects an action body of rotational spring force.
•Point: Selects a point on two bodies to define the location of rotational spring force.
•Direction: Defines the direction of z-axis of rotational spring force.