%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 22-05-12 auf Seite 389.
%% 
%%  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
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{193.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pstricks,pst-3dplot}
%StopShownPreambleCommands
\begin{document}
\psset{unit=0.80}
\begin{pspicture}(-3,-4)(3,3.25)
  \pstThreeDCoor[xMax=4,zMax=3]
  \psset{linewidth=3pt}
  \pstThreeDTriangle[linejoin=0]%
    (3,1,-2)(1,4,-1)(-2,2,0)
  \pstThreeDTriangle[linejoin=1]%
    (3,-1,-2)(1,-4,-1)(-2,-2,0)
  \pstThreeDTriangle[linejoin=2]%
    (-1,1,-2)(-4,-1,-1)(-2,-4,0.5)
\end{pspicture}
\end{document}