%% 
%%  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{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pst-solides3d}

\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=Plain]
\psset{plan=Plain,visibility=false}
\psProjection[object=droite,definition=horizontale,args=-1,name=d]% straight 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]% determine H'
\psProjection[object=line,args=M H]
\psProjection[object=rightangle,args=M H H']% mark right angle
\axesIIID(8,5,3)
\end{pspicture}
\end{document}
