%% 
%%  Ein Beispiel der DANTE-Edition
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%%  7. Auflage
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%%  Beispiel 22-06-62 auf Seite 439.
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%%  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
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{193.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-solides3d}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-3,-2.5)(3.5,2.5)%
\psset{lightsrc=viewpoint,viewpoint=50 30 15,Decran=40,solidmemory,fontsize=15}
\psSolid[object=plan,definition=equation,args={[1 0 1 0] 90},base=-4 4 -3 3,
   fillcolor=white,linecolor=gray!30,planmarks,name=Ebene]
\psset{plan=Ebene,visibility=false}
\psProjection[object=droite,definition=horizontale,args=-1,name=d]% Gerade d
\psProjection[object=point,args=-2 1,name=M,text=M,pos=ul]
\psProjection[object=point,definition=orthoproj,args=M d,name=H,text=H,pos=dr]
\psProjection[object=point,definition=xdpoint,args=2 d,name=H',action=none,
   text=d,pos=ur]% H' festlegen
\psProjection[object=line,args=M H]
\psProjection[object=rightangle,args=M H H']% rechten Winkel markieren
\axesIIID(8,5,3)
\end{pspicture}
\end{document}
