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	\section{Truncate a solid's vertices}

	The option \Lkeyword{trunc} allows us to \Index{truncate} a solid's vertices either
	globally or individually. This option uses the key
	\Lkeyword{trunccoeff} (value $0.25$ by default) which indicates the ratio
	$k$ used for the \Index{truncation} ($0<k\leq 0.5$).
	%
	\begin{itemize}
	\item \texttt{\Lkeyword{trunc}=\Lkeyval{all}} truncates all the vertices;
	\item \texttt{\Lkeyword{trunc}=0 1 2 3} truncates the vertices 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