Thanks Thomas,

Yeah, I think you are right. I don't have it all worked out in my head how the 
coordinate system switch from osg and OpenGL occur. But I notice, now, that 
when I try to get getLookAt() on an identity matrix, I get:

eye: 0, 0, 0
center: 0, 0, -1
up: 0, 1, 0

Instead of what I expected:

eye: 0, 0, 0
center: 0, 1, 0
up: 0, 0, 1

i.e., the identity matrix still has me looking down the -z axis, just like 
OpenGL, even though in the osg World, I'm looking downwards. 

Thanks again,
Frank

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