I have a scene with several objects. It is a geographical map from the Shriveling world project. I want to control the angle between the camera and the geographical plane. I created a plane that is approximately aligned with the geo plane. I tested the addon MeasureIt as in this question, but this does not work since the camera seems to possess no vertex.
My need is: I want to control the camera angle of view with this plane, with zero angle from above and, e.g., 45 deg from any position, north, south, east, west, etc.