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-%%
-%% A DANTE-Edition example
-%%
-%% Example 23-06-73 on page 421.
-%%
-%% 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}
-\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)}
-\psset{viewpoint=50 20 20 rtp2xyz,Decran=50}
-\begin{pspicture}(-3,-3)(3,4)
-\psSurface[algebraic,ngrid=0.2 0.2,incolor=yellow!20,axesboxed,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}