Surfaces conatain many Nod points so it's hard to find a point along the surface.
If you are just looking for a refrence point you do a Sketch type analize by holding down the Control and pick or project a point onto the surface point you want and analize from point to point.
If you pick a point along a surface holding the Shift key done you can type in a Delta value from there to.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Cadcam
Software and hardware sales, contract Programming and Consultant , Cad-Cam Instructor .