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Hi Jeff,
Thanks for the reply.
To answer your first question, I'm using desktop navigation to move the viewpoint. In this task, the view point will start in a random location each time, and the user will be instructed to navigate forward. By placing the viewpoint at the center of the invisible torus, the idea is to allow the user to walk the same distance each time, no matter what direction he/she walks in.
I looked at the Teacher in a Book, looks like there's a lot of helpful stuff. However, the section on lighting doesn't seem to give me what I need - the objects in the scene change lighting, but I need the entire window to dim - as if a semi-transparent screen has dropped over the whole window. Changing the mainview headlamp just adjusts how light falls on the objects, but doesnt't effect the ground or sky.
Does that help clarify what I'm looking for at all?
Thanks!
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