When tracking smooth and round objects, it can be quite difficult or even impossible to place markers to any specific features. On the other hand, it is often quite easy to track the object as a whole with one marker set to Affine or Perspective motion.
Unfortunately, even if such a large marker succeeds to perfectly track the whole object, it cannot be used to create a Plane Track. Plane tracking always needs four markers. Is there a way how to get around this limitation?
Edit: The inspiration here was a videoclip where people have sunglasses filled with funky textures:
Placing several trackers on each of the sunglasses, perhaps on their edges, would be quite unreliable. However, it is easy to track glasses with a single marker like this (movie screenshot):
I am looking for a way how to use the precise orientation of an object tracked this way.