plfsurf3d: Plot shaded 3-d surface plot

plsurf3d (x, y, zops, zp, nx, ny, opt, clevel, nlevel);

Plots a three dimensional shaded surface plot within the environment set up by plw3d. The surface is defined by the data contained in the 2D PLFLT ** 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 PLFLT **), 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, ny opt clevel and nlevel are the same as in for example plsurf3d.

x (PLFLT *, input)

Pointer to set of x coordinate values at which the function is evaluated.

y (PLFLT *, input)

Pointer to set of y coordinate values at which the function is evaluated.

zops (void (*) (?), input)

Pointer to a function for processing the data contained in zp.

zp (PLFLT ** or PLfGrid2 *, input)

Pointer to the data to be plotted, either as a vectored two-dimensional array with set of function values, or as 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.

clevel (PLFLT *, input)

Pointer to the array that defines the contour level spacing.

nlevel (PLINT, input)

Number of elements in the clevel array.

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

This function is used in example 8.