thesis/thesis.tex: Elaborating on network enabled head tracking.

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       \subsubsection{Network enabled head tracking}
         \label{subsubsec:network_enabled_headtracking}
+        Due to the higher availability of sensors, microcontrollers and
+        embedded systems in recent years, it has become very affordable to
+        build network enabled head tracking devices in small series. Many of
+        the conceived devices, such as the \gls{gpl} licensed \textit{Hedrot}
+        \citep{website:hedrot}, allow for \gls{osc} communication.\\
+        Using the \gls{osc} interface, such a head tracker can be added as a
+        client to a \gls{ssr} instance. This would probably require
+        rate-limiting the sensor output, but would enable a networked setup,
+        that could prove to be cheaper, more reliable and flexible, than the
+        compile-time opt-ins (i.e.\ VRPN, Polhemus Fastrak/ Patriot, InterSense
+        InertiaCube3).\\
 
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