Hi Colin,
The current version of Vizard does not have built-in collision detection. You can still do simple collision detection by creating a timer which checks the viewers head position and makes sure it is inside a predefined area. The Art Gallery demo uses this method.
If you have a complex scene then you might want to wait for the next version of Vizard which will be released in late July or early August. The next version will have built-in collision detection which will work with any imported geometry object. We have already tested it out with complex Quake 3 levels and we were able to navigate throughout the level with proper collision detection. This new collision detection can be activated with one line of code, which will save you a lot of time in this case.
-- Farshid
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