%% 
%%  A DANTE-Edition example
%% 
%%  Example 23-05-21 on page 369.
%% 
%%  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}
\def\func{ x 3 exp x y 4 exp mul add x 5 div sub 10 mul
  2.729 x dup mul y dup mul add neg exp mul
  2.729 x 1.225 sub dup mul y dup mul add neg exp add }

\usepackage{pstricks,pst-3dplot}

\begin{document}
\psscalebox{0.8}{%
\begin{pspicture}(-6,-3)(6,4)  \psset{Beta=15}
  \psplotThreeD[plotstyle=curve,drawStyle=yxLines,hiddenLine=true,
    yPlotpoints=50,xPlotpoints=50,linewidth=0.2pt](-4,4)(-4,4){\func}
  \pstThreeDCoor[xMax=5,yMax=5,zMax=3.5]
\end{pspicture}}
\end{document}
