Measurement and Inspection of Photo-Realistic 3-D VR Models

Abstract

Recent advancements in virtual reality (VR) may help unlock the full potential offered by 3D photorealistic models generated using state-of-art photogrammetric methods. Using VR to carry out analyses on photogrammetric models has the potential to assist the user in performing basic off-line engineering inspection of digital twins-digitized representations of real-world objects and structures. However, for such benefits to materialize it is necessary to create suitable interactive systems for working with photogrammetric models in VR. To this end this paper presents PhotoTwinVR-an immersive gesture-controlled system for manipulation and inspection of 3D photogrammetric models of physical objects in VR. An observational study with three domain experts validates the feasibility of the system design for practical use-cases involving off-line inspections of pipelines and other 3D structures.PHOTOGRAMMETRY is a set of methods for extracting information about physical objects from their photographic surveys [1]. Such infor-mation can then be used to construct 3D models, called digital twins, of these real-world objects.We see great potential in embedding pho-

Towards More Effective VR-Based Presentations of Real-World Assets: Showcasing Mobile MRI to Medical Practitioners and Technicians

“…To develop our VR system, we used Unity 1 game engine that is widely used by the VR community [9,11]. To facilitate the VR environment, we decided to employ the Vive Focus 3 2 HMD due to the range of capabilities offered by this particular standalone headset.…”

“…(1) User: in an interactive VR-based presentation (see Fig. 1), we often consider the user as an integral part of the visualization [9,11]. This is even more persistent in our case as we want to give the user a "sense of presence" [7] within the modeled asset, here, the indoors of a real-life mobile MRI truck.…”

“…The relationships between the above five elements can be further analyzed by examining signals exchanged between them [9,11].…”

“…In that context, the user exchanges signals with the rest of the VR system in a number of ways. First, by using hand-tracking functionality, the user transmits signals to the VR headset with the movement and position of hands [11]. In response, the VR headset simultaneously provides feedback by displaying virtual hands.…”

“…1) that a user could freely explore by means of walking [10]. In that context, we decided to use a standalone head-mounted display (HMD) [9,11] rather than other potential realizations of a VR environment such as CAVE [2] not to diminish the portability gains offered by a wireless HMD.…”