Hello, I'm wondering if is possible to use, for image tracking, a db that rely on server (instead on device), updated with custom pictures created by the users. I've googled a bit but I can't see any thread on it... Any help would be much appreciated! Thanks!
ARCore does not currently support tracking "any" image, you'll need to figure out which images to track in a particular area. A GPS-based geofence would work here. Once you know what images you want to track in the area, you can use AugmentedImageDatabase.AddImage to add images to the database. This can be done at runtime, though it takes time and should be done in a background thread.