David Megginson writes:
> 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.
sgEulerToQuat( sgQuat quat, const sgVec3 hpr ) ;
Flightgear-devel mailing list