## SYNOPSIS

**plsurf3d**(

*x*,

*y*,

*z*,

*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 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 PLplot documentation.

Redacted form: **plsurf3d(x, y, z, opt, clevel)**

This function is not used in any examples.

## 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.
*z*(const PLFLT * const *, 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**(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.