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Well, for the first time ever, I pushed them. I still don't know their proper purpose, but this is what I got

http://www.youtube.com/watch?v=c6Fh98c0vI0

Hi Nick,

I think they adjust the view angle of the "camera".

Could be that but, if so, it's not very good at it and I guess they are best left alone.
Perhaps a work-in-progress....

These buttons were added for Zaha Hadid.
They can be used to increase or decrease the field of view. I suppose we could incorporate some angle limiters but then you wouldn't be able to get all trippy with it.