Thanks for your rapid answer. My problem is that I need the user is in an exact place looking towards an exact point (i.e. a place in the real world with some characteristics previously 3d-tracked). I really appreciate Instant Tracking, but it seems not to be suitable for my use case.
Is there a way to start Instant Tracking when a 3D model is recognized? (I think no, it seems to be a nonsense)
If not, will you support 3D Tracking in a stable release of your framework (maybe also in the JS framework)? I'm asking this because we really need a good replacement for Metaio, and your 3D Tracking seems to be a feasible solution for our needs.