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A Platform for Distribution Virtual Environment. RENATA CRUZ TEIXEIRA OTTO CARLOS M.B. DUARTE. Introduction. The aim of virtual distributed environments . The main limitations of distributed virtual reality system.

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a platform for distribution virtual environment

A Platform for Distribution Virtual Environment

RENATA CRUZ TEIXEIRA

OTTO CARLOS M.B. DUARTE

introduction
Introduction
  • The aim of virtual distributed environments.
  • The main limitations of distributed virtual reality system.
  • Some samples of virtual distributed environments.SimNet Systems, EpsNET-IV, WOW
the proposed platform
The Proposed Platform
  • Platform Design.
  • Platform Architecture.
  • Service and protocol description
platform design
Platform Design
  • Two goals: Scalability, Flexibility
  • Ensure consistency control in each group by a special host called leader.
  • Divide the participants into multicast groups
  • Adopt a distributed data model, partitioning virtual world data among its users.
platform design continue
Platform Design(continue)
  • Uses three communications with different features.
    • IP Multicast
    • SRM
    • TCP
service and protocol description
Service and Protocol Description
  • The service primitives
    • VR_Con.Req
    • VR_Con.Ind
    • VR_Con.Conf
    • VR_Dis.Req
    • VR_Dis.Ind
    • VR_Update.Req
    • VR_Update.Ind
service and protocol description con1
Service and Protocol Description(con1.)
  • PDU’s
    • JR, JI, JC, LR, FNL, ES
  • The Predicate_Action Petri Net model
  • On sample of the model(enter the virtual world)
simulation
Simulation
  • Simulation Infrastructure
  • Simulation Model
  • Measurements Performed
simulation model
Simulation Model
  • Parameters of Simulation Model
    • DB initial size, Avatar size, Update size, Pm
  • Detail of Simulation Model
    • The virtual environment is divided into fixed areas.
    • The environment is divided among all leaders
    • The leaders.
    • Participant’s movement
measurements performed
Measurements Performed
  • Delay
    • Transmission of a join request(JR PDU) to the leaders by SRM
    • Waiting time due to leader reaction to the request.
    • Establishment of a TCP connection.
    • Transmission of the database by the TCP.
    • Others
  • The number of messages exchanged
  • The number of handoffs
platform performance
Platform Performance
  • Partition of Virtual Environment
    • Figure 1 --- Delay to enter the virtual environment and to perform a handoff
    • Figure 2 --- Total number of handoffs for all participants
    • Figure 3 --- Number of messages exchanged for the topology with 32 participants

Participant’s speed

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