%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-6-24 on page 412.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  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.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-3dplot}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-3,-4)(3,3.25)
 \pstThreeDCoor[xMin=-4,xMax=4,
                yMin=-3,zMin=-4,zMax=3]
 \psset{linewidth=4pt}
 \pstThreeDTriangle[linejoin=0]
     (3,1,-2)(1,4,-1)(-2,2,0)
 \pstThreeDTriangle
     [linejoin=1,linecolor=red]
     (3,-1,-2)(1,-4,-1)(-2,-2,0)
 \pstThreeDTriangle
     [linejoin=2,linecolor=blue]
     (-1,1,-2)(-4,-1,-1)(-2,-4,0.5)
\end{pspicture}
\end{document}