# plsurf3d.3plplot - Man Page

Plot shaded 3-d surface plot

## 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 matrix *z*[*nx*][*ny*], the point *z*[i][j] being the value of the function at (*x*[i],*y*[j]). Note that the points in vectors *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*(**PLFLT_VECTOR**(3plplot), input)A vector containing the x coordinates at which the function is evaluated.

*y*(**PLFLT_VECTOR**(3plplot), input)A vector containing the y coordinates at which the function is evaluated.

*z*(**PLFLT_MATRIX**(3plplot), input)A matrix containing function values to plot. Should have dimensions of

*nx*by*ny*.*nx*(**PLINT**(3plplot), input)Number of

*x*values at which function is evaluated.*ny*(**PLINT**(3plplot), input)Number of

*y*values at which function is evaluated.*opt*(**PLINT**(3plplot), 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 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*(**PLFLT_VECTOR**(3plplot), input)A vector containing the contour levels.

*nlevel*(**PLINT**(3plplot), input)Number of elements in the clevel vector.

## Authors

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

## See Also

PLplot documentation at http://plplot.org/documentation.php.