EXDRAP: An Extended Dead Reckoning Architectural Pattern for the Development of Web-Based DVE Applications

摘要

Prosperity of distributed 3D applications on the Web heavily depends on the portability and reusability of the content created. Currently, Web3d formats often fall short in resolving such issues. This paper introduces EXDRAP as a hybrid publishing paradigm for declaratively creating Web-based collaborative virtual reality applications which we believe improves portability and reusability. The major issues concerning the development of Web-based CVEs are closely investigated; and an extended dead reckoning technique and an optimizing translation mechanism are proposed which reduce the latency (lag) and the amount of memory taken by the browser, respectively. Based on X3D (the successor to VRML) as the ISO standard for real-time computer graphics on the Web, the concepts are successfully implemented and integrated into Jakarta Struts Framework. In order to gain maximum portability, the integration of the X3D browser and the server-side technology is made possible through the use of ECMAScript instead of Java on the client end.