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%% 
%%  A DANTE-Edition example
%% 
%% 
%%  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}

\usepackage{pst-solides3d}

\begin{document}
\psset{viewpoint=50 50 20 rtp2xyz,lightsrc=25 37 17,Decran=30}
\begin{pspicture}(-1.5,-1)(1.5,6)
\psSolid[object=grille,base=-2 2 -2 2,ngrid=8]
\psSolid[object=prisme,h=10,ngrid=20 2,hue=0 1 0.4 5,
  base=.5 0 .5 .5 0 .5 -.5 .5 -.5 0 -.5 -.5 0 -.5 .5 -.5]
\end{pspicture}
%
\begin{pspicture}(-1.5,-1)(1.5,6)
\psSolid[object=grille,base=-2 2 -2 2,ngrid=8]
\pstVerb{
  /torsion {       % x y z are on the stack
    2 dict begin   % keep everything local
    /M defpoint3d  % save x y z coordinates
    M              % put x y z back on the stack
    /z exch def    % save z coordinate
    pop pop        % delete x y
    M 		   % put x y z on the stack
    0 0 z 18 mul   % put 0 0 18*z on the stack
    rotateOpoint3d % rotate point
    end
  } def }%
\psSolid[object=prisme,h=10,ngrid=20 2,transform=torsion,hue=0 1 0.4 5,
  base=.5 0 .5 .5 0 .5 -.5 .5 -.5 0 -.5 -.5 0 -.5 .5 -.5]
\end{pspicture}
\end{document}