"I'd bet that wii demo used about a 60 degree FOV"
maybe im misunderstanding you here but this guy used a variable fov,
you can see that in the stadium part, this in order to achieve a looking through a window effect, notice when he gets close to the screen you see more of the stadium, just like a real window
thats the idea match zoom adecuately with distance to screen and knowing the size of the screen give a realistic size of objects by the window effect, that keeping the forth motion of head normally assigne to the 6th axe of 6dof
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