HLA-based Distributed Simulation technology is employed widely in Virtual Reality (VR) applications, such as military simulation,
internet games, roaming etc. To support larger number of participants, scalability is becoming a key issue of VR applications.
In this paper, we explore the characteristics of distributed simulation, and analyze the scalability of servers and participants,
and classify ... [Show full abstract] our approach to improve scalability of VR applications into three aspects: a three-tier node management mode
to accommodate more participants, an efficient management of servers to manage scalable number of clients and software development
interface to achieve reusability and interoperability of VR applications. We present our middleware platform, HIVE, providing
a scalable HLA-based distributed simulation framework for VR applications, on which users can develop VR applications easily
and quickly. Then we give the method and view of application integration with HIVE. Finally an experimental demo is given.