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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%%
+%% Copyright (C) 2010 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{352.81416pt}
+\setlength\parindent{0pt}
+\def\NormalSin#1#2#3{\psset{linecolor=#3}\pstVerb{
+ /xP #1 def /yP #2 def /zP 2 #1 Sin mul #2 Sin mul def
+ /normaleX 2 #1 Cos mul #2 Sin mul neg def /normaleY 2 #2 Cos mul #1 Sin mul neg def
+ /Norme normaleX dup mul normaleY dup mul add 1 add sqrt def
+ /Nx normaleX Norme div def /Ny normaleY Norme div def /Nz 1 Norme div def}
+\psSolid[object=vecteur,args=Nx Ny Nz](xP,yP,zP)}
+\StartShownPreambleCommands
+\usepackage{pst-solides3d}
+\StopShownPreambleCommands
+\begin{document}
+\begin{pspicture}[viewpoint=50 20 20 rtp2xyz,Decran=50](-3,-3)(3,4)
+\psSurface[algebraic,ngrid=0.2 0.2,incolor=yellow!20,axesboxed,showAxes=false,
+ Zmin=-2,Zmax=2,fillcolor=blue!20](-3,-3)(3,3){2*sin(x)*sin(y)}%
+\NormalSin{1.57}{0.75}{red}\NormalSin{1.57}{1.57}{blue}%
+\NormalSin{2}{1.57}{green}\NormalSin{-1.57}{-1.57}{magenta}
+\end{pspicture}
+\end{document}