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+\section{Point}
+
+\subsection{Definition via coordinates}
+
+The object \verb+point+ defines a point. The simplest method is to use the argument \texttt{[args=$x$ $y$ $z$]} to specify its coordinates.
+If we have already named a point $M(x, y, z)$ (see chapter ``\textit{Advanced usage\/}''), we can easily use the argument \texttt{[args=$M$]}.
+
+\subsection{Some other definitions}
+
+There are some other possibilities for defining a point. Here a list of possible definitions with the appropriate arguments:
+
+\begin{itemize}
+
+\item \verb+[definition=solidgetsommet]+;
+\verb+args=+ $solid$ $k$.
+
+The vertex with index $k$ of the solid $solid$.
+
+\item \verb+[definition=solidcentreface]+;
+\verb+args=+ $solid$ $k$.
+
+The centre of the face with index $k$ of the solid $solid$.
+
+\item \verb+[definition=isobarycentre3d]+;
+\verb+args=+
+ {\{$[$ $A_0$ $\ldots $ $A_{n}$ $]$\}}. %$
+
+ {The isobarycentre of the system $[(A_0, 1);
+ \ldots ; (A_n, 1)]$.}
+
+\item \verb+[definition=barycentre3d]+;
+\verb+args=+
+ {\{$[$ $A$ $a$ $B$ $b$ $]$\}}.
+
+ {The barycentre of the system $[(A, a) ; (B, b)]$.}
+
+\item \verb+[definition=hompoint3d]+;
+\verb+args=+
+ {$M$ $A$ $\alpha $}.
+
+ {The image of $M$ via a homothety with centre $A$ and ratio $\alpha $.}
+
+\item \verb+[definition=sympoint3d]+;
+\verb+args=+
+ {$M$ $A$}.
+
+ {The image of $M$ via the center of symmetry $A$}%I don't understand
+
+\item \verb+[definition=translatepoint3d]+;
+\verb+args=+
+ {$M$ $u$}.
+
+ {The image of $M$ under the translation via the vector $\vec u$}
+
+\item \verb+[definition=scaleOpoint3d]+;
+\verb+args=+
+ {$x$ $y$ $z$ $k_1$ $k_2$ $k_3$}.
+
+ {This gives a ``dilation'' \ of the coordinates of the point $M (x, y,
+ z)$ on the axes $Ox$, $Oy$ and $Oz$ each multiplied by an appropriate factor $k_1$,
+ $k_2$ and $k_3$}
+
+\item \verb+[definition=rotateOpoint3d]+;
+\verb+args=+
+ {$M$ $\alpha_x$ $\alpha_y$ $\alpha_z$}.
+
+ {The image of $M$ through consecutive rotations -- centered at $O$ -- and with respective angles
+ $\alpha_x$, $\alpha_y$ and $\alpha_z$ around the axes $Ox$,
+ $Oy$ and $Oz$.}
+
+
+
+%% Projection orthogonale d'un point 3d sur un plan
+%% Mx My Mz (=le point a projeter)
+%% Ax Ay Az (=un point du plan)
+%% Vx Vy Vz (un vecteur normal au plan)
+\item \verb+[definition=orthoprojplane3d]+;
+\verb+args=+
+ {$M$ $A$ $\vec v$}.
+
+ {The projection of the point $M$ to the plane $P$ which is defined
+ by the point $A$ and the vector $\vec v$, perpendicular to $P$.}
+
+\item \verb+[definition=milieu3d]+;
+\verb+args=+
+ {$A$ $B$}.
+
+ {The midpoint of $[AB]$}
+
+\item \verb+[definition=addv3d]+;
+\verb+args=+
+ {$A$ $u$}.
+
+ {Gives the point $B$ so that $\overrightarrow {AB} = \vec u$}
+
+\end{itemize}
+
+\endinput