osgART tutorial 2: Multiple Markers

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In this tutorial, we will learn how to add multiple tracked objects to our scene.

Adding multiple tracked objects is a simply involves creating more branches in the scene graph, one for each object we want to independently move.

To avoid confusion, we should point out that we are talking about tracking multiple discrete markers, rather than an ARToolKit multi-marker: ARToolKit supports a feature called multi-marker tracking in which groups of markers are treated as one single marker. This feature helps alleviate the problem where tracking fails because not all of a marker is visible. By having lots of markers, the likelihood that at least one can be seen is high. osgART also supports this feature, however it is not covered in this tutorial.