Geodesics are available for both Bezier and Catmull-Rom patches.

Click the menu icon. Then select the 'Intrinsic Geometry' tab. Then left-click and hold the mouse at the geodesic start point inside the intrinsic geometry plot for the desired surface. Then drag the mouse and release it to define the geodesic initial tangent vector.

The calculation of the geodesic with initial conditions corresponding to the intrinsic coordinate and tangent will be performed immediately. This action can be repeated.

Go to the 'Properties' tab to see a list of the Geodesics.