KeywordsVirtual environments, shared virtual worlds, GreenSpace. ABSTRACTThis paper describes a shared virtual world with four key goals: a reasonable economic model; low latency for world synchronization; a hospitable environment for users; and affordances for social'interaction. The first goal is supported by examining economic issues related to the design of commercially viable 3D virtual environments including issues such as allowing use of currently developed Web based content. The second goal is supported by underlying network support that combines a mixed set of Internet protocols and a mixed model of a central server for universal resource management and multicast based transaction distribution. The final two goals are supported through architectural design patterns and a literature review of social issues and personal representation in virtual worlds.
We have developed a 3D multiuser system for the Internet called Ladakh. This system enables users to participate in a shared virtual world on the Internet and to communicate with each other. The system is based on a client–server system and uses the HTTP protocol between a client and a server to maintain compatibility with existing web network services. The system consists of multiple servers connected via a multicast network. The shared‐world manager in each server communicates and guarantees consistency among the shared worlds of the distributed servers. Therefore, clients can share the same virtual world even though they communicate through different servers. We have also evaluated the proposed Ladakh system architecture. It was found that about 50 users could join the same shared world at the same time on Ladakh. © 1999 Scripta Technica, Syst Comp Jpn, 30(3): 52–60, 1999
SUMMARYWe have developed a 3D multiuser system for the Internet called Ladakh. This system enables users to participate in a shared virtual world on the Internet and to communicate with each other. The system is based on a clientserver system and uses the HTTP protocol between a client and a server to maintain compatibility with existing web network services. The system consists of multiple servers connected via a multicast network. The sharedworld manager in each server communicates and guarantees consistency among the shared worlds of the distributed servers. Therefore, clients can share the same virtual world even though they communicate through different servers. We have also evaluated the proposed Ladakh system architecture. It was found that about 50 users could join the same shared world at the same time on Ladakh. © 1999 Scripta Technica, Syst Comp Jpn, 30(3): 5260, 1999
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