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@@ -7,11 +7,11 @@ To allow users to easily find these interesting locations within the NVE, _3D bo
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A bookmark is simply a 3D virtual camera (with position and camera parameters) predefined by the content provider, and can be presented to users in different ways, including as a text link (URL), a thumbnail image, or a 3D object embedded within the NVE itself.
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When users click on a bookmark, NVEs commonly provide a "fly-to" animation to transit the camera from the current
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viewpoint to the destination #cite("controlled-movement-virtual-3d", "browsing-3d-bookmarks") to help orient the users within the 3D space.
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viewpoint to the destination @controlled-movement-virtual-3d @browsing-3d-bookmarks to help orient the users within the 3D space. // TODO double cite
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Clicking on a bookmark to fly to another viewpoint leads to reduced data locality.
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The 3D content at the bookmarked destination viewpoint may overlap less with the current viewpoint.
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In the worst case, the 3D objects corresponding to the current and destination viewpoints can be completely disjoint.
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Such movement to a bookmark may lead to a _discovery latency_ #cite("second-life"), in which users have to wait for the 3D content for the new viewpoint to be loaded and displayed.
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Such movement to a bookmark may lead to a _discovery latency_ @second-life, in which users have to wait for the 3D content for the new viewpoint to be loaded and displayed.
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An analogy for this situation, in the context of video streaming, is seeking into a segment of video that has not been prefetched yet.
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In this chapter, we explore the impact of bookmarks on NVE navigation and streaming, and make several contributions.
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