Figure 1 shows the location and the orientation of the geometry reference frame in the default link shape for Track (LM) toolkit. The location of the geometry reference frame is the middle center point on the below plane of two box-shaped geometries which is for supporting the pin. In the plane the pin supporting boxes and grouser geometries are connected.
Each link position is defined by the geometry reference frame in the track assembly. Therefore, all position and orientation data of the mesh data for generating the flexible link must be defined with respect to the geometry reference frame.
Figure 1 Geometry reference frame of the track link body in the Track (LM) toolkit