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par-extensions-en.tex
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\section{Creating your own object}
It is possible to create your own object in a separate file and
import it into the list of objects recognized by
\texttt{pst-solides3d}. Create a text file with the extension of \texttt{.pro}
(myObj.pro) and enter the PostScript commands to define your
\texttt{pst-solides3d} object.
Reference your \texttt{.pro} file in the preamble with
\begin{verbatim}
\pstheader{myObj.pro}
\end{verbatim}
Following this line, add this new object to the list of objects recognized by \texttt{pst-solides3d}
with
\begin{verbatim}
\addtosolideslistobject{myObj}
\end{verbatim}
For some examples of this technique, see the following web pages:
\centerline{\url{http://melusine.eu.org/syracuse/mluque/solides3d2007/cristaux/}}
\centerline{\url{http://melusine.eu.org/syracuse/mluque/solides3d2007/rhombicuboctaedre/}}
\section{Creating a \texttt{.u3d} file}
You can manipulate 3D objects created with \texttt{pst-solides3d};
the following three steps are necessary:
\begin{enumerate}
\item Save your designed 3D object in the \texttt{.off} or
\texttt{.obj} format---see the chapter ``\textit{Usage of external files}''.
\item Then use, for example, \textit{Meshlab}---an open source software---(\url{http://meshlab.sourceforge.net/}) to convert these files
into the \texttt{.u3d} format.
\item The {\LaTeX} package \texttt{movie15} of Alexander \textsc{Grahn} embeds
files in the \texttt{.u3d} format into a PDF document, the document can then be viewed
using $\text{Adobe}^{\text{\tiny\circledR}}$ $\text{Reader}^{\text{\tiny\circledR}}$ 7 or later.
\end{enumerate}
You will find some examples on the following web pages:
\centerline{\url{http://melusine.eu.org/syracuse/mluque/solides3d2007/pdf3d/}}
\centerline{\url{http://melusine.eu.org/syracuse/mluque/solides3d2007/zeolithes/}}
\endinput

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