plsurf3d: Plot shaded 3-d surface plot

plsurf3d (x, y, z, 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 two-dimensional array z[nx][ny], the point z[i][j] being the value of the function at (x[i], y[j]). Note that the points in arrays x and y do not need to be equally spaced, but must be stored in ascending order. For further details see the Section called Three Dimensional Surface Plots in Chapter 3.

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.

z (PLFLT **, input)

Pointer to a vectored two-dimensional array with set of function values.

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: plsurf3d(x, y, z, opt, clevel)

This function is not used in any examples.