Define Direction

# VITESS Tool Define Direction

    1) Converts between direction definitions in VITESS:
     Cartesian: X = main propagation axis,
                Y = horizontal axis (left positive),
                Z = vertical axis (upward positive).
     Spherical: Theta = Angle with the +X axis,
                Phi   = Angle of the YZ projection with the +Y axis.
     Euler:     How to transform vector into (1 0 0 )?
                Rotates +X into chosen direction i.e. +X''= direction.
                Alpha =  First frame rotation angle around the Z axis,
                Beta  =  Second frame rotation angle around the new Y axis.

    2) Performs Euler frame rotations as next option.

    IMPORTANT: Positive rotation of frame means rotation of one positive
    axis towards a higher index positive axis : +X->+Y, +Y->+Z, +X->+Z

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Last modified: Thu Jan 29 15:15:00 MET 2004, G.Zs.