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VISHO

       SUBROUTINE  VISHO (X,Y, N, IDIR, PL2)
 C$    (Horizons)
 C$    This subroutine updates  the horizons for  the hidden  line
 C$    subroutines.  The actual work is  done by VISBO, but  VISHO
 C$    contains  the   work   arrays  needed   in   the   simplest
 C$    applications,  avoiding  the   necessity  to  define   them
 C$    separately for each individual program.  The arguments are:
 C$
 C$    X(N)..........Array of arguments.
 C$    Y(N)..........Array of function values.
 C$    IDIR..........Direction of pen movement.
 C$    PL2...........2-D pen movement subroutine.
 C$    (09-APR-82)