| 
            plpoin3
          ( | n , | 
| x , | |
| y , | |
| z , | |
| code ); | 
      Plot a glyph at the specified 3D points.  (This function is largely
      superseded by plstring3 which gives access to many[!] more glyphs.)
      Set up the call to this function similar to what is done for plline3.
      
         means try to
      just draw a point.  Right now it's just a move and a draw at the same
      place.  Not ideal, since a sufficiently intelligent output device may
      optimize it away, or there may be faster ways of doing it.  This is OK
      for now, though, and offers a 4X speedup over drawing a Hershey font
      "point" (which is actually diamond shaped and therefore takes 4
      strokes to draw).  If 0 < code < 32, then a useful (but small
      subset) of Hershey symbols is plotted.  If 32 <= code <= 127 the
      corresponding printable ASCII character is plotted.
    code=-1
      
n
          (PLINT
            Number of points in the
            
               and
            x
            
               vectors.
          y
            
x
          (PLFLT_VECTORA vector containing the x coordinates of points.
y
          (PLFLT_VECTORA vector containing the y coordinates of points.
z
          (PLFLT_VECTORA vector containing the z coordinates of points.
code
          (PLINT
            Hershey symbol code (in "ascii-indexed" form with -1 <= code <=
            127) corresponding to a glyph to be plotted at each of the
            
               points.
          n
            
      Redacted form: plpoin3(x, y, z, code)
    
This function is not used in any example.