Npsnet

1993

Many tools and techniques have been developed to address specific aspects of interacting in a virtual world. Few, however, have been designed with an architecture that allows large numbers of entities from disparate organizations to interact in such a world, in real time, and over large real geographic distances. This paper describes a system architecture that does this. The paper discusses the key technologies that have made these virtual worlds possible, and explains how the technologies fit into the architecture. A sample implementation of this architecture, the SIMulation NETworking (SIMNET) system, is then presented, along with various design decisions and the reasoning behind them.

2007 International Conference on Parallel and Distributed Systems, 2007

The current expansion of multi-player online games has promoted the growth of large scale distributed virtual environments (DVEs). In these systems, peer-to-peer architectures have been proved as an efficient scheme for supporting massively multi-player applications. In order to research on this type of architecture, stand-alone simulators do not take into account inconsistencies due to network latency, and it is necessary to develop a distributed tool that allows to simulate large-scale DVEs in an efficient way. In this paper, we propose a distributed platform for simulating the behavior of Peer-To-Peer DVEs. This simulator is implemented following a modular architecture. It is capable of providing the main performance metrics in distributed systems, and it contains all the elements involved in real DVE simulations like the awareness method and the graphic interface. As a result, this tool can be used in real simulations of Peer-to-Peer DVEs, becoming an invaluable tool for capturing the behavior of this kind of systems.

1997

• Techno-software technology for the networked VE. • Interact-interaction technology for the networked VE. • Apps-VE applications.

Presence: Teleoperators and Virtual Environments, 2001

Collaborative virtual environments (CVEs) are a promising technology enabling remote participants to share a common place through three-dimensional graphical scenes. Within the COVEN project (Normand, 1999), we have run prolonged series of Internet trials that have allowed us to gather valuable data to formulate usability guidelines and networking requirements. However, running such trials in a real setting and making sure that the application and networking infrastructures will be stable enough is still a challenge. In this paper, we describe some of our experiences, together with the technical choices that have permitted many hours of successful Internet trials. We also make a thorough analysis of different correlated logging data. This analysis allows us to propose and con rm a model of a CVE application's network behavior, together with a number of interesting results that disprove some common assumptions. Furthermore, we use the model and the logging data to highlight the bene ts of IP multicasting and for predicting traf c behaviors and bandwidth use on top of different logical network topologies.

Distributed Systems Engineering, 1998

We introduce the network software architecture of the distributed interactive virtual environment platform. The platform is designed to scale with a large number of simultaneous participants, while ensuring maximum interaction at each site. Scalability is achieved by making extensive use of multicast techniques and by partitioning the virtual space into smaller regions. We also present an application-level backbone that can connect islands of multicast-aware networks together.

International Journal of Intelligent Games & Simulation, 2003

Multiplayer computer games rely on the practicability of the underlying network infrastructure. In this paper, we describe essential networking concepts and review techniques developed for reducing networking resource requirements in distributed interactive real-time applications. Also, we present a survey of the relevant literature concentrating on the scientific research done on military simulations, networked virtual environments, and multiplayer computer games.

… , 1997., Proceedings Sixth IEEE workshops on, 1997

VRML (the Virtual Reality Modeling Language) has brought 3D objects and virtual worlds to a large number of Internet users. While it provides a suitable basis for the platform independent description of virtual worlds, an appropriate network architecture required to realize shared virtual worlds on the Internet is still an open issue. In this paper we will review some basic network architectures for networked VR and introduce DWTP (the Distributed Worlds Transfer and communication Protocol). DWTP is an application layer protocol for shared virtual environments on the Internet. It provides a scalable network architecture for large-scale distributed virtual worlds. We will show how it is used within our current prototype to realize a distributed multiuser virtual environment.

Proceedings of the third symposium on Virtual reality modeling language - VRML '98, 1998

VRML (the Virtual Reality Modeling Language) has brought 3D objects and virtual worlds to a large number of Internet users. While it provides a suitable basis for the platform independent description of virtual worlds, an appropriate network architecture required to realize shared virtual worlds on the Internet is still an open issue. In this paper we will introduce DWTP (the Distributed Worlds Transfer and communication Protocol). DWTP is an application layer protocol for shared virtual environments on the Internet. It provides a scalable network architecture for large-scale distributed virtual worlds.

Journal on Interactive Systems, 2017

Collaborative Virtual Environments (CVEs) are Virtual Reality (VR) systems and can simulate medical procedures such as surgeries performed by a group of remote users which can interact with one another through the simulation in real-time, with the aid of a network such as the Internet.Therefore, it is important to note that research on CVE-specific networking issues allows us to better understand the requirements for real-time applications. This paper discloses design and implementation issues of a peer-to-peer multicast architecture on the collaborative module of theCyberMed VR framework, aiming at providing better network scalability, as well as it shows as results, some developed applications as validation. Finally, we compared the performance of the newly implemented peer-to-peer multicast architecture with the peer-to-peer unicast previously existent with simulated models designed with OPNET Network Modeler and R statistical software. As result of our experiments, the null hypo...

Handbook of Internet computing, 2000

Integration of the multi-user virtual reality environment into the Web environment provides a richer way for the user to access the network resource, such as video or sound clip, and to build a virtual society over the Internet.