Human-Computer Interaction: Communication, Cooperation, and Application Design

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview

Dynamic Event Filtering Technique using Multi- level Path Approximation in a Shared Virtual Environment

Seok-Jong Yu1, Yoon-Chul Choy1, Kyun Koh2

1 Dept. of Computer Science, Yonsei University

2 Dept. of Computer and Information Engineering, Chongju University


1 Introduction

As VRML and Internet technology develops, the interest in an Internet-based shared virtual environment (SVE) is increasing. A massive amount of data, low network bandwidth, and high latency are known as the main obstacles to the development of such a system ( Lea, Matsuda, Hagsand, and Stenius 1997). These make it difficult for a SVE system to keep the consistency requirement among a large amount of participants distributed on WAN ( Funkhouser 1995). For sharing a virtual environment, the logical information as well as the physical geometric data must be considered. Unlike physical information, a change of the logical information such as an object's state must be propagated throughout the running time. The moving objects such as avatars or autonomous objects tend to create a large amount of behavioral events continuously. For example, when n objects move simultaneously, each changing its position and orientation m times per second, the updates should be processed m*n times per second ( Funkhouser 1995). An increase of the update messages causes an increase of network traffic and transmission latency, which can undermine the scalability and the stability of a system.


2 Event Filtering

Event filtering is the process that culls the unessential parts of the event messages occurred in SVE and minimizes the event message traffics necessary


Table 1 Existing event filtering methods
categories filtering algorithms applied systems
Event sampling method
(transmission frequency
controlling)
Path prediction
(Dead Reckoning)
DIS, NPSNET
Room-to-Room visibility RING
Spatial partitioning method
(propagation region
controlling)
Static spatial partitioning
(Hexagonal cell)
DIS, NPSNET
Dynamic spatial partitioning
(Aura-based AQI)
MASSIVE, DIVE,
Community place

-583-

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