I've never been able to get a robust spherical movement function to allow you to walk around the surface of a planet. It always has problems, and the examples I see on the web basically use methods I'm not sure work in Lite_C... that is, they often end up with a lookat matrix and such.. which isn't much use(as far as I know) when you have to set plan/tilt/ roll to get the camera to work in A8.

It would be nice if you could just set an up vector... and rotate around that...