NAME

       plfsurf3d - Plot shaded 3-d surface plot

SYNOPSIS

       plfsurf3d(x, y, zops, zp, nx, ny, opt, clevel, nlevel)

DESCRIPTION

       Plots  a  three  dimensional  shaded  surface  plot  within  the  environment  set  up  by
       plw3d(3plplot). The surface is defined by the data contained in  the  2D   const  PLFLT  *
       const * matrix or the PLfGrid2 structure zp. How the data in  zp is rendered is determined
       by the  zops parameter. zops is a pointer to a function that reads the  data  out  of  the
       grid structure. The following functions in PLplot core will return an appropriate function
       pointer:  plf2ops_c() (use when  zp is of type  const PLFLT * const  *),  plf2ops_grid_c()
       (use  when   zp is a pointer to a row-major PLfGrid2 structure),  plf2ops_grid_row_major()
       (same as plf2ops_grid_c()?) and  plf2ops_grid_col_major() (use when zp is a pointer  to  a
       column-major  PLfGrid2  structure).   nx,  nyoptclevel  and  nlevel are the same as in for
       example plsurf3d(3plplot).

       Redacted form? plfsurf3d(x, y, zops, zp, opt, clevel)

       This function is used in example 8.

ARGUMENTS

       x (const PLFLT *, input)
              Pointer to set of x coordinate values at which the function is evaluated.

       y (const PLFLT *, input)
              Pointer to set of y coordinate values at which the function is evaluated.

       zops (PLF2OPS, input)
              Pointer to a function for processing the data contained in zp.

       zp (PLPointer, input)
              Pointer to the data to be plotted, either as a vectored  two-dimensional array with
              set of function values or as a PLfGrid2 structure.

       nx (PLINT, input)
              Number of x values at which function is evaluated.

       ny (PLINT, input)
              Number of y values at which function is evaluated.

       opt (PLINT, input)
              Determines  the  way  in which the surface is represented. To specify more than one
              option just add the options, e.g. FACETED + SURF_CONT opt=FACETED: Network of lines
              is  drawn connecting points at which function is defined.  opt=BASE_CONT: A contour
              plot  is  drawn  at  the  base  XY  plane  using  parameters  nlevel  and   clevel.
              opt=SURF_CONT: A contour plot is drawn at the surface plane using parameters nlevel
              and clevel.  opt=DRAW_SIDES: draws a curtain between the  base  XY  plane  and  the
              borders  of  the plotted function.  opt=MAG_COLOR: the surface is colored according
              to the value of Z; if MAG_COLOR is not  used,  then  the  default  the  surface  is
              colored  according  to  the  intensity of the reflected light in the surface from a
              light source whose position is set using pllightsource(3plplot).

       clevel (const PLFLT *, input)
              Pointer to the array that defines the contour level spacing.

       nlevel (PLINT, input)
              Number of elements in the clevel array.

AUTHORS

       Many developers  (who  are  credited  at  http://plplot.sourceforge.net/credits.php)  have
       contributed to PLplot over its long history.

SEE ALSO

       PLplot documentation at http://plplot.sourceforge.net/documentation.php.

                                          February, 2014                       PLFSURF3D(3plplot)