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The CaveVisualizer.py example script (File -> Quick Open -> type "cavevisualizer") that comes with Vizard should help visualize how the head_tracker and cave_origin objects are used to construct the final rendered viewpoint. If you haven't already had a look at it, I would recommend you do so.
The Cave class only uses the head_tracker object to update the projection matrix. The projection matrix is computed using the users physical eye location relative to each wall. It does not update the virtual viewpoint (i.e. viz.MainView).
The CaveView class is used to modify the virtual viewpoint. The final viewpoint will be composed of the cave origin and the users physical head location. Think of the cave as a flying carpet in this virtual world. The cave_origin is the carpet, and the head_tracker is the user standing on the carpet.
Hope this clears things up.
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