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\section{The parameter \texttt{visibility}}
For all projections, the Boolean \texttt{[visibility]}
(\verb+true+ by default) specifies whether or not to have the
projection made visible.
Set to \verb+false+, the projection is always carried out. Set to
\verb+true+, the projection is only carried out when the plane of
projection is visible from the viewpoint of the observer.
\endinput
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