To initialize detection and tracking of a Model Target, Vuforia Engine provides options to the developers to show Guide Views that assist the user during the AR experience to initiate tracking from a specified angle and distance. Matching the object with the displayed pose indicated on the screen will initiate the tracking.
In Vuforia Engine, both the image and the angle/distance relative to the object that image represents is called a Guide View. The Guide View is generated together with the Model Target database in the Model Target Generator desktop tool provided by Vuforia. There are two types of Model Target databases; Standard Model Targets and Advanced Model Targets. For each database generated, one or more Guide Views can be created to help detection and tracking of the object. The Guide View is used differently depending on the type of Model Target database.
- Standard Model Target databases can have one or multiple Guide Views which can be switched between manually. This is useful if you are tracking a large object where only parts of the object are to be tracked or if the user is meant to approach the object from a certain position. Alternatively, multiple Guide Views can be used to carry out a series of tasks chronologically,
- Advanced Model Target databases can contain multiple Model Targets that have been trained using a deep learning process. Each target can contain one or more Advanced Guide Views that support recognition from up to a 360° range around the Guide View position. The Vuforia SDK automatically detects the object in view and will not display the Guide View on the screen as with untrained databases, because detection can happen within an angular range. The Guide View is still used to define the detection range and it is necessary for training the Advanced Model Target database.