@Piyush, I havent tried this in Unity so not sure if it will work there.
What I had to do in the JS-PhoneGap version is to have a 2D multi-object tracker look for fake name tags (which act like QR codes), which then triggers and load the correct 3D Object Trackers. To figure out when a user "wants" to look at a new 3D target, I just use a basic timeout in trackable.onObjectLoss.
Here is the general steps:
@Piyush
The easiest way to do this in Unity is to add a second ObjectTrackable child GameObject to the ObjectTracker. For each ObjectTrackable, make sure that the Target Pattern contains the name of the target it is associated with and add the appropriate prefab in the Drawable field.
So for ObjectTrackable 1 you would have the name of the object 1 target written in the Target Pattern as it was specified in the Target Manager and prefab 1 in the Drawable field. Same for ObjectTrackable 2.
Best regards,
Alexandru
Yetzer Studio
Is it possible to increase the number of current targets in an object collection?
After adding 10 object target movies, we received an error "You have reached the maximum of allowed targets in the current target collection".