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@@ -196,7 +196,7 @@ As of today, an immersive \AR system tracks itself with the user in \ThreeD, usi
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It enables the \VE to be registered with the \RE and the user simply moves to navigate within the virtual content.
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%This tracking and mapping of the user and \RE into the \VE is named the \enquote{extent of world knowledge} by \textcite{skarbez2021revisiting}, \ie to what extent the \AR system knows about the \RE and is able to respond to changes in it.
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However, direct hand manipulation of virtual content is a challenge that requires specific interaction techniques \cite{billinghurst2021grand}.
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It is often achieved using two interaction techniques: \emph{tangible objects} and \emph{virtual hands} \cite[p.165]{billinghurst2015survey,hertel2021taxonomy}.
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It is often achieved using two interaction techniques: \emph{tangible objects} and \emph{virtual hands} \cite[p.165]{billinghurst2015survey}.
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\subsubsection{Manipulating with Tangibles}
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\label{ar_tangibles}
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