Recognize Marker and Lock 3D Tracking

When AR is enabled, the tracking lock interface appears. Whenever the AR framework is tracking a marker, the frame will become green and a semi-transparent green 3D square will overlap the tracked marker. This provides information on the precision and stability of the tracking.

After the device captures the surrounding of the marker (as the interface suggests to do with a 2D animation), the user can decide that the tracking is accurate enough and press the lock button to start the AR experience.