Point to Surface (PTSF)

A point to surface joint constrains a fixed point on a body to slide along a surface. The point to surface joint provides five degrees of freedom: three rotational at the instantaneous point of contact and two translational DOF.

1. If the Advanced Joint panel is not currently displayed, select the desired advanced joint by clicking on it in the Model Browser or in the modeling window.
   The Advanced Joint panel is automatically displayed.
2. From the Connectivity tab, click Body 1 and pick a body from the modeling window, or double-click Body 1 to open the Model Tree (from which the desired body can be selected).
3. Click the Point collector and select the point of the PTSF joint from the modeling window (or pick the point from the Model Tree).
4. Click the Surface collector and select the predefined surface for the joint from the modeling window (or pick the point from the Model Tree).
5. Click the Ref Marker collector and select the surface reference marker that belongs to Body 2 from the modeling window or the Model Tree.
6. Click the Initial Conditions tab.
7. Select the User Initial Condition Marker check box and select the desired marker using the Marker collector.
   The default initial condition marker for the joint is the reference marker that is specified in the Connectivity tab.
8. Select the Use XYZ check box and enter in the initial position values into the X, Y, and Z fields to specify an initial position for the point.
   Note: These values will supersede those specified by the Point collector in the Connectivity tab.