A Study on Distributed Multi-User Virtual Reality System

• Main Authors: Hung-Chun Chiu, 邱鴻鈞
• Other Authors: Hao-Ren Ke
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/38141102673716752598

碩士 === 國立交通大學 === 資訊科學系 === 88 === With the great improvement of network speed, computer CPU power and graphical capability, it is gradually becoming possible to develop virtual reality systems participated by multi-users via networks. Virtual Reality Modeling Language (VRML) is a standard for modeling 3D virtual worlds under WWW; however, the current version of VRML does not support interaction between multiple users. To overcome this shortcoming of VRML, we can employ JAVA to enable network communication among participant computers and External Authoring Interface (EAI) to facilitate control over the local scene data of a virtual environment. In this paper, we propose an architecture for a client-server multi-user virtual reality system that is realized by VRML, JAVA, and EAI. In this paper, we refine the PDUs proposed in DIS to encapsulate messages transferred in our system. A pre-buffering method and dead reckoning are leveraged to overcome the disadvantages of TCP. Finally, the results and demonstration of our system are also introduced in this paper.