Click here for more examples . Below is a brief list that comes to mind. Attached to an avatar. Tracking feedback used to orient avatar's head. Walking down a shopping aisle or museum corridor or neighborhood street.
Proximity sensors are place on objects of interest.
When my position enters the prozimity zone of a product, exhibit, or house for sale, the coordinates of the item of interest are routed to my tracking viewpoint's toVector. Spectator at any virtual event. If it is a play, then I can select the actor to watch and dial in a zoom factor. If it is an Airshow, I can follow the fast moving aircraft quite easily from the ground or ride in the aircraft and track on another aircraft. This is where the magnification and standoffDistance variables work great.