`plsurf3d`: Plot shaded 3-d surface plot
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#### `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”.

`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`.

`clevel` (`const 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.

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`plstyl`: Set line style | Home | `plsurf3dl`: Plot shaded 3-d surface plot for z[x][y] with y index limits