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VISCH

       SUBROUTINE  VISCH (X,Y,P, N1,N2, IDIR, PL2)
 C$    (Colored Horizon)
 C$    This subroutine updates  the horizons for  the hidden  line
 C$    subroutines.  The actual work is  done by VISBO, but  VISCH
 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$    N1.............Starting location in X(*) and Y(*).
 C$    X(N2)..........Array of arguments.
 C$    Y(N2)..........Array of function values.
 C$    IDIR...........Direction of pen movement.
 C$    PL2............2-D pen movement subroutine, usually PL2CA.
 C$    (10-AUG-89)