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\section{Truncate a solid's vertices}

The option \verb+trunc+ allows us to truncate a solid's vertices either
globally or individually. This option uses the key
\verb+trunccoeff+ (value $0.25$ by default) which indicates the ratio
$k$ used for the truncation ($0<k\leq 0.5$).
%
\begin{itemize}
  \item \verb+[trunc=all]+ truncates all the vertices;
  \item \verb+[trunc=0 1 2 3]+ truncates the vertices \texttt{[0,1,2 and 3]}.
\end{itemize}
%
\begin{LTXexample}[width=6cm]
\psset{viewpoint=50 50 30 rtp2xyz,Decran=25,lightsrc=viewpoint}
\begin{pspicture}(-3,-2)(2,2)
\psSolid[
   action=draw,
   object=cube,
   RotZ=30,
   trunccoeff=.2,
   trunc=all]%
\end{pspicture}
\end{LTXexample}

\begin{LTXexample}[width=6cm]
\psset{viewpoint=50 50 30 rtp2xyz,Decran=25,lightsrc=viewpoint}
\begin{pspicture}(-3,-2)(2,2)
\psSolid[action=draw,
   object=cube,
   RotZ=30,
   trunccoeff=.2,
   trunc=0 1 2 3]%
\end{pspicture}
\end{LTXexample}

\endinput