A platform for distribution virtual environment
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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

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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.

  • Some samples of virtual distributed environments.SimNet Systems, EpsNET-IV, WOW


The Proposed Platform

  • Platform Design.

  • Platform Architecture.

  • Service and protocol description


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)

  • Uses three communications with different features.

    • IP Multicast

    • SRM

    • TCP


Platform Architecture


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.)

  • PDU’s

    • JR, JI, JC, LR, FNL, ES

  • The Predicate_Action Petri Net model

  • On sample of the model(enter the virtual world)


Service and Protocol Description(con1)


Service and Protocol Description(con2)


Sample(Entering the virtual world)


Simulation

  • Simulation Infrastructure

  • Simulation Model

  • Measurements Performed


Topology Generation


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

  • 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

  • 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


Delay to enter the virtual environment and perform a handoff


Total number of handoffs for all participants


Number of Messages exchange with 32 participants.


End


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