\chapter{Conclusion}
\mainlabel{conclusion}

\section*{Summary}

\section*{Future Work}

\subsection*{Visual Rendering of the Hand for Manipulating Virtual Objects in Augmented Reality}

These results have of course some limitations as they only address limited types of manipulation tasks and visual hand characteristics, evaluated in a specific \OST-\AR setup.
The two manipulation tasks were also limited to placing a virtual cube in predefined target volumes.
Testing a wider range of virtual objects and more ecological tasks \eg stacking, assembly, will ensure a greater applicability of the results obtained in this work, as well as considering bimanual manipulation.
Similarly, a broader experimental study might shed light on the role of gender and age, as our subject pool was not sufficiently diverse in this respect.
However, we believe that the results presented here provide a rather interesting overview of the most promising approaches in \AR manipulation.

\section*{Perspectives}

% systematic exploration of the parameter space of the haptic rendering to determine the most important parameters their influence on the perception
% measure the difference in sensitivity to the haptic feedback and how much it affects the perception of the object properties
% design, implement and validate procedures to automatically calibrate the haptic feedback to the user's perception in accordance to what it has been designed to represent
% + let user free to easily adjust (eg can't let adjust whole spectrum of vibrotactile, reduce to two or three dimensions with sliders using MDS)