Attributes of Multi Targets
An ideal Multi Target has the same requirements as an ideal Image Target. We therefore recommend to consult the Best Practices for Designing and Developing Image-Based Targets that will explain everything you need to know for a good trackable image.
A cereal box and similar product packages are good use cases for Multi Targets. Since Multi Targets are tracked as a single trackable item, performance is substantially improved (compared to tracking multiple single-Image Targets at the same time).
The factors that differ from an Image Target are the dimensional parameters of a Multi Target. This guide will explain the following concepts of defining these parameters and maintaining its geometric consistency.
We recommend the depth of the Multi Target be at least half the width of the front side. Since Multi Targets are detected and tracked as shapes, it is important to present enough rich details on the side to maintain a steady tracking experience. A side of a Multi Target that is too slim might fail and loose tracking.
A DVD case is a good example of a 3D object that has small depth. The spine label on a DVD case is usually too thin to find features at a distance. So, the Multi Target would be lost when turning the DVD cover around.
TIP: You can detect and track the DVD case by using one target image on each side as it is not required to fill all sides of a Cuboid with images. Providing only a front and back target image on a Multi Target is sufficient for a user to track content on either side of the 3D object.