The user must use the surface which have 2 or 4 edges when creating the PTSF joint.
The user can create a joint entity as follows.
•4-sided Surface, Point
•4-sided Surface: Selects a 4-sided surface.
•Point: Selects a point on the body to define the location of PTSF joint. The.
•4-sided Surface, Body, Point
•4-sided Surface: Selects a 4-sided surface.
•Body: Selects an action body of PTSF joint.
•Point: Selects a point on the body to define the location of PTSF joint.