Add intro section in chapters

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\noindent Providing haptic feedback during free-hand manipulation in \AR is not trivial, as wearing haptic devices on the hand might affect the tracking capabilities of the system \cite{pacchierotti2016hring}.
\section{Introduction}
\label{intro}
Providing haptic feedback during free-hand manipulation in \AR is not trivial, as wearing haptic devices on the hand might affect the tracking capabilities of the system \cite{pacchierotti2016hring}.
Moreover, it is important to leave the user capable of interacting with both virtual and real objects, avoiding the use of haptic interfaces that cover the fingertips or palm.
For this reason, it is often considered beneficial to move the point of application of the haptic rendering elsewhere on the hand (\secref[related_work]{vhar_haptics}).
However, the impact of the positioning of the haptic rendering on the hand during direct hand manipulation in \AR has not been systematically studied.