%% 
%%  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{pst-3dplot}
\def\drawCircles{%
  \parametricplotThreeD[xPlotpoints=100](80,360)(0,360){%
        /k 2 def /k2 4 def
        t cos k mul 3 u sin k mul add mul
        t sin k mul 3 u sin k mul add mul
        u cos k2 mul
  }
  \parametricplotThreeD[yPlotpoints=75](0,360)(80,360){%
        /k 2 def /k2 4 def
        u cos k mul 3 t sin k mul add mul
        u sin k mul 3 t sin k mul add mul
        t cos k2 mul
  }
  \parametricplotThreeD[yPlotpoints=2,linecolor=red,linewidth=2pt](0,360)(80,360){%
        /k 2 def /k2 4 def
        u cos k mul 3 t sin k mul add mul
        u sin k mul 3 t sin k mul add mul
        t cos k2 mul
  }}

\StopShownPreambleCommands
\begin{document}
\psset{unit=0.6}
\begin{pspicture}(-5,-5.5)(5,6)
   \psset{Beta=20,Alpha=50,linewidth=0.1pt,linecolor=cyan}
   \drawCircles
\end{pspicture}
\end{document}
