On desktop, what mechanisms should I be using to implement a simple zoom in and 
out of the 3d scene? I am using a camera node and have tried using xFov, yFov 
and position properties with mixed results. I'm using the example code from 
Apple as a starting point learning this framework and really like the built-in 
mouse control, I seem to be missing something obvious.

Thank you.

-
Thomas C.
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