%% 
%%  Ein Beispiel der DANTE-Edition
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%%  7. Auflage
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%%  Beispiel 22-06-37 auf Seite 426.
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%%  Copyright (C) 2016 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
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{97.16928pt}
\setlength\parindent{0pt}
\usepackage{pst-solides3d}
%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\psset{Decran=30,viewpoint= 20 20 30 rtp2xyz}
\defFunction{para}(u,v){2 u u mul mul 2 v v mul mul add}{}{}
\begin{pspicture}(-6,-1)(6,7)
\psSolid[object=surface*,r=1,function=para,ngrid=36 36]
\end{pspicture}
\end{document}