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DEM88

       SUBROUTINE  DEM88 (NIN,NOUT)
 C$    (DEM88 - Cartesian Surface versus 3-D PolyLine)
 C$    Demonstration for  the programs   HIDSE, HIDNWS,  and HIDSW
 C$    which  give perspective   views of functions  stored in   a
 C$    rectangular  array.  The demonstration shows  a flat-bottom
 C$    crater on a hill.
 C$
 C$    This is a variation of DEM03, and illustrates 3-D  polyline
 C$    graphing with PLNGV in a  side-by-side view.  PLNGV can  be
 C$    used to superimpose 3-D space curves on a hidden-line  plot
 C$    produced by HIDGV, HIDGV2, or  any of the directional  view
 C$    routines, HIDNE, HIDNW,  HIDSE, or HIDSW.   The curves  are
 C$    drawn independently of the surface plotting that  maintains
 C$    the  near  and  far  horizons  necessary  for  hidden  line
 C$    elimination, so all segments will be visible.
 C$
 C$    An unclosed box  is shown on the  PLNGV plot; the  vertical
 C$    line marks the  Z  axis extending from  the  origin  in the
 C$    lower left corner.
 C$    (13-JUL-89)