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INQUP3

       SUBROUTINE  INQUP3 (DX,DY,DZ)
 C$    (Inquire 3-D View Up Direction)
 C$    Return the  View  Up  direction  specified  by  the  vector
 C$    (DX,DY,DZ) measured in  world coordinates  relative to  the
 C$    View Reference Point.  The projection of this vector on the
 C$    view plane defines the up direction.
 C$    (01-APR-82)