A 3D GIS Perspective Towards the Occlusion Problem in XR Environment Hao-Han Chang (a*), Jung-Hong Hong (b)
a) Graduate Student, Department of Geomatics, National Cheng Kung University, Tainan, Taiwan
*p66134072[at]gs.ncku.edu.tw
b) Professor, Department of Geomatics, National Cheng Kung University, Tainan, Taiwan
Abstract
Extended Reality (XR) represents the convergence of physical and virtual environments, thereby creating a new operational framework. Within this context, Virtual Reality (VR) and Augmented Reality (AR) offer unique perspectives that enable innovative applications. VR is primarily concerned with delivering a fully immersive experience within a completely virtual setting, whereas AR focuses on the concurrent presentation of virtual elements alongside the physical world. A significant challenge encountered in XR environments is the ^occlusion problem,^ which negatively impacts spatial realism and depth perception when users engage with the virtual environment. The challenges associated with VR and AR applications, however, differ considerably. VR applications prioritize the completeness of phenomena and the accuracy of spatial representation, while AR applications must also account for the spatial relationships between virtual information, real-world objects, and users. Inadequate management of occlusion can result in the erroneous rendering of virtual information in front of real objects. This research aims to investigate the occlusion problem within XR environments by employing 3D Geographic Information System (GIS) data as a reference for constructing models in the virtual domain. By harnessing the benefits of multi-dimensional spatial representation and precise positioning, along with rendering techniques from computer graphics, the study aspires to establish an accurate visual relationship between occluders and occluded objects. The investigation begins with an analysis of observable phenomena from the user^s perspective, contrasting the considerations necessary for the distinct development of VR and AR simulated environments, and proposes strategies to alleviate the occlusion problem through the inclusion of 3D GIS data. A campus environment has been selected as a practical case study, which includes a web-based interactive platform that integrates XR technology. This initiative not only demonstrates the efficacy of system integration and application but also explores its potential advantages and the challenges related to practical implementation.
Keywords: Extended Reality, Virtual Reality, Augmented Reality, Geographic Information Systems, Occlusion Problem
