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%%
%% Ein Beispiel der DANTE-Edition
%%
%%
%% Copyright (C) 2010 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\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}
\StopShownPreambleCommands
\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}
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