Thanks to one of the features in JME, the obj to jme convertor, it is easy to provide a simple way for the application developer to load in custom models and content to associate to a marker.

If you want to make use of this in your ARMonkeyKit applications, take a look at the new example in the latest revision ARMaggie. This places a model of Maggie Simpson onto a marker. You can probably see how this works from the code but here is a brief explanation:

Making use of the Object Loader static class all you need to do is call the loadObjectFromFile method, providing a name to identify the model, and the location of the .obj file.

It is important that if you have a material file for the model, this is in the same directory as the .obj file.

This will then return a Node, which you can treat the same as any other content from the previous examples.