par-projectionvisibility-en.tex
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	\section{The parameter \texttt{\Index{visibility}}}

	For all projections, the Boolean \Lkeyword{visibility}
	(\verb+true+ by default) specifies whether or not to have the
	projection made visible.

	Set to \verb+false+, the \Index{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