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

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


Platform architecture

Platform Architecture


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)


Service and protocol description con11

Service and Protocol Description(con1)


Service and protocol description con2

Service and Protocol Description(con2)


Sample entering the virtual world

Sample(Entering the virtual world)


Simulation

Simulation

  • Simulation Infrastructure

  • Simulation Model

  • Measurements Performed


Topology generation

Topology Generation


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


Delay to enter the virtual environment and perform a handoff

Delay to enter the virtual environment and perform a handoff


Total number of handoffs for all participants

Total number of handoffs for all participants


Number of messages exchange with 32 participants

Number of Messages exchange with 32 participants.


A platform for distribution virtual environment

End


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