Real-Time Spatial Data Management for Scalable Networked Augmented Virtual Spaces

Masatoshi ARIKAWA  Shinji SHIMOJO  Akira AMANO  Kaori MAEDA  Reiji AIBARA  Kouji NISHIMURA  Kaduo HIRAKI  Kazutoshi FUJIKAWA  

IEICE TRANSACTIONS on Information and Systems   Vol.E82-D    No.1    pp.99-112
Publication Date: 1999/01/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on New Generation Database Technologies)
Category: Spatial and Temporal Databases
spatial database,  VRML,  multi-user space,  network,  LoD,  QoS,  augmented virtuality,  

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This paper proposes a new framework of managing virtual spaces based on spatial databases as an extension of VRML-based systems. The framework is suitable for treating continuous virtual spaces and for managing the quality of service (QoS) of the virtual spaces depending on user's operations and situations of computer resources. Levels of detail (LoD) of 3D objects is the most important rule for rendering scenes dynamically while managing the QoS. This paper describes a method of managing the QoS depending on the LoD in the form of spatial queries. An advantage of the framework is that spatial databases can incrementally construct virtual spaces in clients using differential descriptions based on VRML, that is, DVRML, proposed in this paper. Dynamic spatial data such as avatar's movement and real-time multimedia data such as videos should be shared by all participants in a virtual space in real time. Our framework can also handle dynamic spatial data by means of real-time updating of some spatial objects in spatial databases as well as static spatial data. We developed some experimental applications based on the framework in order to prove that it is feasible for networked virtual spaces with video components.

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