David Megginson wrote:

I've thought of a simpler way to approach this problem. Let's say
that I have a plane and the three Euler angles of rotation, phi,
theta, and psi (roll, pitch, and yaw). Given those three angles, I'd
like to determine which direction around the z axis is most directly
uphill and how steep the hill is.

Hmmm, that's a good mind bender ... I'm still thinking ... linear algebra was *sooo* long ago ... :-)


Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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