If you have done Surface Drawing on a photograph that is processed and some or all of the Surface Draw points are not being calculated in 3D (i.e. you cannot measure the points and points/lines do not appear in the 3D Viewer), the problem may be that the assigned Surface may not have a 3D position. Click on the Surfaces defining objects to see if they all have valid positions or use the Surface Table to determine if the surface has a 3D position.