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+\section{The object \texttt{vecteur}}
+
+\subsection{Definition with components}
+
+The object \verb+vecteur+ allows us to define a vector. The simplest way to do that is to use the argument \texttt{[args=$x$ $y$ $z$]} to specify its components.
+
+\psset{lightsrc=10 -20 50,viewpoint=50 -20 30 rtp2xyz,Decran=100}
+\begin{LTXexample}[width=6cm]
+\begin{pspicture*}(-1,-1)(1,2)
+\psSolid[object=vecteur,
+ action=draw*,
+ args=0 0 1,
+ linecolor=yellow]%
+\psSolid[object=vecteur,
+ args=1 0 0,
+ linecolor=red]
+\psSolid[object=vecteur,
+ args=0 0 1,
+ linecolor=blue](1,0,0)
+\end{pspicture*}
+\end{LTXexample}
+
+\subsection{Definition with 2 points}
+
+We can also define a vector with 2 given points $A$ and $B$ of $\mathbb{R}^3$.
+
+One then uses the arguments \verb+[definition=vecteur3d]+ and \texttt{[args=$x_A$ $y_A$ $z_A$ $x_B$
+$y_B$ $z_B$]} where $(x_A, y_A, z_A)$ and $(x_B, y_B, z_B)$ are the appropriate coordinates of the points $A$ et $B$
+
+If the points $A$ and $B$ were already defined, one can easily use the named variables:
+\texttt{[args=$A$ $B$]}.
+
+\psset{lightsrc=10 -20 50,viewpoint=20 20 20,Decran=20}
+\begin{LTXexample}[width=6cm]
+\begin{pspicture*}(-3,-3)(4.5,2)
+\psSolid[object=plan,
+ linecolor=gray,
+ definition=equation,
+ args={[0 1 1 0]},
+ base=-1 3 -2 2,
+ planmarks,
+ plangrid]
+\psSolid[object=vecteur,
+ definition=vecteur3d,
+ args=0 0 1 1 1 1]%
+\end{pspicture*}
+\end{LTXexample}
+
+
+\subsection{Some other definitions of a vector}
+
+There are some other possibilities to define a vector. Here a list of some possible definitions with the appropriate arguments:
+
+\begin{itemize}
+
+\item \verb+[definition=addv3d]+;
+\verb+args=+ $\vec u$ $\vec v$.
+
+Addition of 2 vectors.
+
+\item \verb+[definition=subv3d]+;
+\verb+args=+ $\vec u$ $\vec v$.
+
+Difference of 2 vectors.
+
+\item \verb+[definition=mulv3d]+;
+\verb+args=+ $\vec u$ $\lambda $.
+
+Multiplication of a vector with a real.
+
+\item \verb+[definition=vectprod3d]+;
+\verb+args=+ $\vec u$ $\vec v$.
+
+Vector product of 2 vectors.
+
+\item \verb+[definition=normalize3d]+;
+\verb+args=+ $\vec u$.
+
+Normalized vector $\Vert \vec u\Vert ^{-1} \vec u$.
+
+\end{itemize}
+
+\endinput