I was wondering the same things. He said that adding a second marker would be easy, so I suppose the idea must be to alternate between the objects. Three marke

I was wondering the same things. He said that adding a second marker would be easy, so I suppose the idea must be to alternate between the objects. Three markers and one base station ought to be enough to get 6DOF tracking, but of course a practical system will need many more to handle the user facing the other way, and that may not be practical.