The user can create a joint entity as follows.
•Point, Direction
•Point: Selects a point on two bodies to define the location of translational joint.
•Direction: Defines the direction of axis of translational joint. If the user clicks a point, the z-axis defined by two points will become the axis of translational joint.
•Body, Body, Point, Direction
•Body: Selects a base body of translational joint.
•Body: Selects an action body of translational joint.
•Point: Selects a point to define the location of translational joint.
•Direction: Defines the direction of axis of translational joint. If the user clicks a point, the z-axis defined by two points will become the axis of translational joint.