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+%%
+%% A DANTE-Edition example
+%%
+%% Example 23-05-55 on page 388.
+%%
+%% Copyright (C) 2011 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+\documentclass[]{article}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks,pst-3dplot,pst-grad}
+\def\func{x dup mul y dup mul 2 mul add x 6 mul sub y 4 mul sub 3 add 10 div}
+
+\begin{document}
+\psset{unit=1cm,linewidth=1.5pt}
+\begin{pspicture}(-1,-1)(10,9)
+ \psset{Beta=20,Alpha=160,subticks=7}
+ \pstThreeDCoor[xMin=0,yMin=0,zMin=0,xMax=7,yMax=7,zMax=7,linewidth=1pt]
+ \psset{linewidth=0.1pt,linecolor=gray}
+ \pstThreeDPlaneGrid(0,0)(7,7)
+ \pstThreeDPlaneGrid[planeGrid=xz,planeGridOffset=7](0,0)(7,7)
+ \pstThreeDPlaneGrid[planeGrid=yz](0,0)(7,7)
+ {\psset{linewidth=1.5pt}
+ \pscustom[fillstyle=gradient,plotstyle=curve]{
+ \psplotThreeD[xPlotpoints=200,yPlotpoints=1,drawStyle=xLines](0,7)(0,0){\func}
+ \psplotThreeD[xPlotpoints=1,yPlotpoints=200,drawStyle=yLines](7,7)(0,7){\func}
+ \psplotThreeD[xPlotpoints=200,yPlotpoints=1,drawStyle=xLines](7,0)(7,7){\func}
+ \psplotThreeD[xPlotpoints=1,yPlotpoints=200,drawStyle=yLines](0,0)(7,0){\func}}}
+ \pstThreeDPlaneGrid[planeGrid=yz,planeGridOffset=7](0,0)(7,7)
+\end{pspicture}
+\end{document}