51 lines
2.8 KiB
TeX
51 lines
2.8 KiB
TeX
\chapter{Bookmarks, navigation and streaming\label{bi}}
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\minitoc{}
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\newpage
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\begin{figure}[th]
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\centering
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\begin{subfigure}[b]{0.45\textwidth}
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\includegraphics[width=\textwidth]{assets/preliminary-work/bookmarks/camera-bookmark.png}
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\caption{Viewport display of a bookmark}
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\end{subfigure}
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\begin{subfigure}[b]{0.45\textwidth}
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\includegraphics[width=\textwidth]{assets/preliminary-work/bookmarks/arrow-bookmark.png}
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\caption{Arrow display of a bookmark}
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\end{subfigure}
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\begin{subfigure}[b]{0.45\textwidth}
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\includegraphics[width=\textwidth]{assets/preliminary-work/bookmarks/arrow-bookmark-with-preview.png}
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\caption{A preview is shown when the mouse hovers a bookmark}
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\end{subfigure}
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\begin{subfigure}[b]{0.45\textwidth}
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\includegraphics[width=\textwidth]{assets/preliminary-work/bookmarks/arrow-bookmark.png}
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\caption{A coin is hidden behind the curtain\newline}
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\end{subfigure}
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\caption{3D bookmarks propose to move to a new viewpoint; when the user clicks on the bookmark, his viewpoint moves to the indicated viewpoint.\label{bi:bookmark}}
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\end{figure}
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% Bookmarks are virtual objects that represent a point of view, that are rendered with the scene and that can help user navigation.
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In this chapter, we present our first contribution: an analysis of the impact of bookmarks on navigation and streaming.
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We implement a 3D navigation interface where the keyboard translates the camera and the mouse rotates it.
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We augment this interface with 3D bookmarks.
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When the user's cursor hovers a bookmark, a preview of the point of view is displayed to the user, and when the user clicks on a bookmark, the camera smoothly moves from its current position to the bookmarked point of view.
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We conduct a within-subject user-study on 51 participants, where each user starts with a tutorial to get used to the 3D navigation controls, and then tries successively to perform a task with and without bookmarks.
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We show that not only the presence of bookmarks causes a faster task completion, but also that it allows users to see a larger part of the scene during the same time span.
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However, in a streaming scenario, this phenomenon leads to higher network requirements to maintain the same quality of service.
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In the last part of this chapter, we simulate a streaming setup and we show that knowing the positions of the bookmarks beforehand allows us to pre-compute information that we can reuse during streaming to compensate for the harm caused by the faster navigation with bookmarks.
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\newpage
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\newcommand{\NoReco}{\textsf{NoBM\xspace}}
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\newcommand{\Viewports}{\textsf{VP\xspace}}
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\newcommand{\Arrows}{\textsf{Ar\xspace}}
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\input{preliminary-work/intro}
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\input{preliminary-work/bookmarks-impact}
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\input{preliminary-work/streaming}
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\input{preliminary-work/conclusion}
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