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Is Semitransparency Useful for Navigating Virtual Environments?
Authors: Chittaro L., Scagnetto I.
Published in: Proceedings of VRST-2001: 8th ACM Symposium on Virtual Reality Software & Technology, ACM Press, New York, November 2001, pp. 159-166
Abstract: A relevant issue for any Virtual Environment (VE) is the navigational support provided to users who are exploring it. Semitransparency is sometimes exploited as a means to see through occluding surfaces with the aim of improving user navigation abilities and awareness of the VE structure. Designers who make this choice assume that it is useful, especially in the case of VEs with many levels of occluding surfaces, e.g. virtual buildings or cities. This paper is devoted to investigate this assumption with a proper experimental evaluation on users. First, we discuss possible ways for improving navigation, and focus on implementation choices for semitransparency as a navigation aid. Then, we present and discuss the experimental evaluation we carried out. We compared subjects performance in three conditions: local exploitation of semitransparency inside the VE, a more global exploitation provided by a bird's-eye-view, and a control condition where neither of the two features was available.
Copyright: © ACM Press 2002. The Authors retain the right to post their own author-versions of preprints and revisions, including versions covered by ACM copyright but not versions downloaded from the ACM Digital Library, in a personal collection on their own or their employer's server; such copies must be limited to noncommercial distributions and personal use by others and the ACM copyright notice must be attached.