%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 15-03-20 auf Seite 781.
%% 
%%  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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{142.324pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
\StartShownPreambleCommands
\usepackage{pst-solides3d}
\StopShownPreambleCommands
\begin{document}
\psset{viewpoint=100 50 20 rtp2xyz,Decran=60,
       lightsrc=10 15 10}
\defFunction[algebraic]{corne}(u,v) %
  {(2 + u*cos(v))*sin(2*pi*u)} %
  {(2 + u*cos(v))*cos(2*pi*u) + 2*u} %
  {u *sin(v)}
\begin{pspicture}(-2,-2)(2,2)
\psSolid[object=surfaceparametree,
  base=0 1 0 2 pi mul,function=corne,ngrid=20]
\end{pspicture}
\end{document}
