%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-5-18 on page 396.
%% 
%%  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{243.59894pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-3d}
\StopShownPreambleCommands
\begin{document}
\psset{unit=.3cm}
\begin{pspicture}(-5,-3)(4,3)
  \psset{viewpoint=1 1 0.5}
  \ThreeDput[normal=0 0 1]{\psgrid(-3,-3)(6,6)}
  \ThreeDput[normal=-1 0 0](0,4,0){\psframe*[linecolor=blue](4,4)}
\end{pspicture}\hfill
\begin{pspicture}(-5,-3)(4,3)
  \psset{viewpoint=1.5 1 0.5}
  \ThreeDput[normal=0 0 1]{\psgrid(-3,-3)(6,6)}
  \ThreeDput[normal=-1 0 0](0,4,0){\psframe*[linecolor=blue](4,4)}
\end{pspicture}
\end{document}