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.