To initialize detection and tracking of a Model Target, Vuforia Engine provides options to the developers to display Guide Views that assist the user during the AR experience to look at the object from an expected angle and distance. Matching the object with the expected pose indicated with the image 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 different types of Model Target databases and for each database, 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, each with one or multiple Guide Views. The Vuforia SDK automatically detects the object in view and will display the Guide View closest resembling that object.
- Advanced Model Target 360 database can contain one Model Target with one Guide View. The Guide View for a Model Target 360 is not displayed on the screen as with the other databases because the object can be detected from any angle. However, the Guide View is used to select a detection range and must be generated along with the Model Target database.