ex_10.tex

\documentclass[a4paper]{article}
\usepackage{pst-solides3d}
\pagestyle{empty}
\begin{document}
 
%@AUTEUR: Juergen Gilg
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	Decran=60,lightsrc=15 5 10}
\begin{pspicture}(-6,-11)(-6,7)
\rput(0,0){
\defFunction[algebraic]{klein}(u,v){cos(u)*cos(v)*(abs(cos(7*v/4))^1.7 + 
    abs(sin(7*v/4))^1.7)^(-1/0.2)*(abs(cos(7*u/4))^1.7 + 
    abs(sin(7*u/4))^1.7)^(-1/0.2)}%
{sin(u)*(abs(cos(7*u/4))^1.7 + abs(sin(7*u/4))^1.7)^(-1/0.2)}%
{cos(u)*sin(v)*(abs(cos(7*v/4))^1.7 + 
    abs(sin(7*v/4))^1.7)^(-1/0.2)*(abs(cos(7*u/4))^1.7 + 
    abs(sin(7*u/4))^1.7)^(-1/0.2)}
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    base=pi neg 2 div pi 2 div  0 pi 2 mul,
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    fillcolor=green,
    ngrid=60,
    %RotY=90,
    RotX=-90,
    function=klein]%
}
\end{pspicture}
 
\end{document}