Hi Christopher,

> view.upDownAngle
> view.leftRightAngle
> view.tiltAngle
> What units are these in? Degrees?

Yes, they're in degrees.


> I assume that upDownAngle==0 means looking in a
> horizontal direction. Are positive values up or down?

An upDownAngle==0 means you are looking straight downwards, the up/down and left/right angle values are used as in a Spherical coordinate system as shown here:
http://en.wikipedia.org/wiki/Spherical_coordinate_system

upDownAngle is the angle the eye position is rotated downwards around the world xaxis, and left-right angle is the amount it swings left or right rotating around the zaxis.


> And what is tiltAngle?

tilt angle is the angle of rotation around the view vector, like the roll axis angle shown in this diagram (from Wikipedia):





> Are positive values of leftRightAngle left or right?

It should follow the right-hand rule with the orientation being the world z axis.

- Michael