This paper addresses the question: to what extent can deliberate manipulations of interpupillary distance (IPD) and eye height be used in a virtual reality (VR) experience to influence a user's sense of their own scale with respect to their surrounding environment - evoking, for example, the illusion of being miniaturized, or of being a giant? In particular, we report the results of an experiment in which we separately study the effect of each of these body scale manipulations on users' perception of object size in a highly detailed, photorealistically rendered immersive virtual environment, using both absolute numeric measures and body-relative actions. Following a real world training session, in which participants learn to accurately report the metric sizes of individual white cubes (3"-20") presented one at a time on a table in front of them, we conduct two blocks of VR trials using nine different combinations of IPD and eye height. In the first block of trials, participants report the perceived metric size of a virtual white cube that sits on a virtual table, at the same distance used in the real-world training, within in a realistic virtual living room filled with many objects capable of providing familiar size cues. In the second block of trials, participants use their hands to indicate the perceived size of the cube. We found that size judgments were moderately correlated (r = 0.4) between the two response methods, and that neither altered eye height (± 50cm) nor reduced (10mm) IPD had a significant effect on size judgments, but that a wider (150mm) IPD caused a significant (µ = 38%, p < 0.01) decrease in perceived cube size. These findings add new insights to our understanding of how eye height and IPD manipulations can affect peoples' perception of scale in highly realistic immersive VR scenarios.
|Original language||English (US)|
|Title of host publication||International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments, ICAT-EGVE 2017|
|Editors||Robert W. Lindeman, Gerd Bruder, Daisuke Iwai|
|Number of pages||8|
|State||Published - 2017|
|Event||27th International Conference on Artificial Reality and Telexistence, ICAT 2017 and the 22nd Eurographics Symposium on Virtual Environments, EGVE 2017 - Adelaide, Australia|
Duration: Nov 22 2017 → Nov 24 2017
|Name||International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments, ICAT-EGVE 2017|
|Conference||27th International Conference on Artificial Reality and Telexistence, ICAT 2017 and the 22nd Eurographics Symposium on Virtual Environments, EGVE 2017|
|Period||11/22/17 → 11/24/17|
Bibliographical noteFunding Information:
This work was supported by the National Science Foundation through grants CHS: Small: Transforming the Architectural Design Review Process through Collaborative Embodiment in HMD-based Immersive Virtual Environments (1526693) and II-NEW: Virtual Reality Infrastructure and Technology Development to Support Architectural Education and Basic Research in Immersive Design, Embodied Interaction, Spatial Cognition (1305401), and by the Linda and Ted Johnson Digital Design Consortium Endowment.