computer supported collaborative visualization c s c v sun-in lin [email protected]

Computer Supported Collaborative Visualization

C S C VSun-In Lin

[email protected]

<I>

Introduction

Traditional Scientific-Visualization software can only help one man visualize some data on his desktop.

Scientific Visualization

Visualize

Collaboratively Visualizing data set on a desktop at different LOCATIONS, even at different TIME -- CSV.

Single Host Visualization

<< Multi-User Mode >>

Surface Rendering Stereo Rendering

Wireframe RenderingNPR Rendering

CV Server

<< Single-User Mode >> import

Network

com

prise

Collaborative Scientific Visualization

WCV: Collaborative visualization system using web-styled user interface. WCV extended from Computer Supported Co-operative Work (CSCW).

VideoConferencing

E-Mail

VisualizationWorkShifts

Time

Place

Same Different

Sam

eDiff

eren

t

Web-Based Collaborative Visualization

<II>

System Design Goal

Developing a collaborative visualization system enabling to support both “synchronous” and “asynchronous” operations.

※ System Design Goal (1) ※

Visualization+

Network

Visualization+

Neowork+

Record

VisualizationVisualization

+Record

Time

Plac

e

Same Different

Sam

eDiff

eren

t

Shared-Screen： Remote Display (X-Window) Shared-Image: Sending Rendered Images

(centralized Approach) Shared-Control: Sending Control Parameters (Distributed

Approach) Sharing viewpoint、 camera、 visualization attributions

、 collaboration contents, etc.

LAN

LAN

WAN

gateway (router or bridge)


Requiring a cross-platform system supporting various operating systems for several hardware platforms.

MAC OS

OS/2

Windows 98

SolarisFree BSD

IBM AIX

Linux

Windows NT

Server

NetWork


<III>

System Architecture

Member Service: Member Server and Member Client. CV Service: CV Server and CV Client. Advantages: two services are with independency. Adopting Visualization Toolkits (VTK)

※ System Architecture (1) ※

MemberServer

MemberClient

CVServer

CVClient

Server

Client

Dual servers with three execution modes.


Member Server CV Server

Tcl/TkJava (socket)

Member Server + CV Server Member Server

CV Server

(II) LAN

(I) Single Host

(III) WAN

Tcl/Tk

Java

(socke

t)

Double View-Windows: Global and Local View.


Global ViewGlobal View Local ViewLocal View

IBM 相容型

CV Server

CV Client

Member Server Side.

※ System Architecture (4): Member Server※

Connection Control

Condition Check

SystemKernel WWW Server

Java Socket

Mem

ber Cl

ient

CV Server

CommunicationUnit

Control Unit

Service Process

Administrator GUI

Process Unit

Database Access

File Access

Access Unit

Member Client Side.

※ System Architecture (5): Member Client ※

Dynamic HTML

BrowserHTTP

CommunicationUnit

Control Unit

Service GUI

Display Unit

MIME Type

Access Unit

CV Server Side.


Connection Control

Condition Verify

SynchronizeCenter Tcl/Tk Socket

Java Socket

CV C

lient

Mem

ber Server

CommunicationUnit

Control Unit

Administrator GUI

RemoteManagement

Management Unit

CollaborativeContent

Log File

Access Unit

CV Client Side.


Refresh Control

Synchronize Control

MessageParser

Tcl/Tk Socket

Java Socket

CommunicationUnit

Control Unit

Global View

Local View

Display Unit

CollaborativeContent

Log File

Access Unit

CollaborativeAction

Collaboration Mode

Operation Unit

Basic Feature

Advanced Feature

Function Unit

Security Issues.


1

2

4

3

ConfigFile

LocalAdministrator

RemoteAdministrator

MemberServer

MemberTable

AllowTable

CVServer

CVClient

CVClient

CVClient

Verify

Verify

Modify

Qualification Table Maintenance.


MemberTable

MemberServer

ConfigFile

GUI

CV Server

JAV

A S

ock

et

JAV

A S

ock

et

I / O

LocalAdministrator

Command

Command

RemoteAdministrator

DeleteCommand

Close the

sockets

dependent

on

the deleted

set of

"IP and User"

Global Execution Architecture: an overview.


MemberClient

CVClient

MemberServer

CVServer

Server

Client

LocalAdministrator

RemoteAdministrator

Internet

Internet

<IV>

Execution Procedure

Global execution procedure: an overview.

Member Server CV Server

bro

wse

r (http

)

Log

in R

eq

uest

bro

wse

r (h

ttp

)M

em

ber

Veri

fied

bro

wse

r (http

)

CV

Req

uest

Tcl/Tk or Java (socket)Member and Host Data

bro

wse

r (h

ttp

)C

V S

erv

er

Loca

tion

Stereo Glass

End User

Tcl/Tk (so

cket)

CV

Login Tc

l/Tk (

sock

et)

Client

Veri

fied

Tcl/Tk (socket)

CV Cycle

Tcl/Tk (socket)

CV C

ycle

Tcl/Tk (socket)

CV Cycle

Tcl/T

k (s

ocke

t)

CV Cyc

le

⊕

※ Development Components ※

VTK Mesa

C/C++Java

Script

OpenGL

Java

Java

Tcl/Tk

vtkdll.dll vtktcl.dll

Browser

ASP

WWWServer

Database

Java Tcl/Tk

Tcl/Tk Java

JavaScript

Mesa

C/C++ Tcl/Tk

OpenGL

JavaVTK

ASP

NewVTKLib

Browser

VBScript

WWWServer

Database

Java

Client Side(Member + CV)

Member Server Side

CV Server Side

CSCV System

※ Implementing NPR Function (1) ※

Reader Filter Mapper

ActorRenderer

RenderWindow RenderWindowInteractor

Property

Data

Set

Visualization

New Actor

NPR

Critical techniques

※ NPR Functions (2) ※

VTK

Mapper

Property

GLMmodel

GLMmodel

GLMmodel

GLMmodel

GLMmodel

GLMmodel

GLMmodel

NPR

※Model Editing ※

Reader Filter Mapper

ActorRenderer

RenderWindow RenderWindowInteractor

Property

Data

Set

Visualization

New Actor

Mapper Mapper Mapper

※ Converting Scripts to C Source ※

子選取並在此輸入標題

CSCV System

Tcl/TkCode

TclInterp

TkWindow

Tcl/TkRunTime

LibMemory

Executable File

Tcl/Tk Script

Other Data

Tcl/Tk Call

Other Code

RunTime

<V>

Performance Analysis

(Contrived)

Performance Impact Factors 1. Network Transmission Speed

2. Numbers of Collaborative Member

3. Collaborative Model Complexity

4. Hard Disk Access Speed in the CV Server

5. Processing Speed in the CV Client

6. Collaborative Operations

Name Value Meaning

Response Time RTReceiver：GlobalView finish action (T3) –Sender：LocalView begin sending operation (T1)

Communication Time CTReceiver：GlobalView finish receiving data (T2) –Sender：LocalView begin sending data (T1)

Rendering Time RT – CT Receiver：GlobalView synchronization renderingcost (T3 – T2)

Definition of Collaboration Time

Test Scene

Test Environment

Machine Machine Network Memory Clock

Name Locations (MBps) (MB) (MHz)

Server 國高中心 100 512 250

M-1 中興大學 100 128 392

M-2 中興大學 100 256 450

M-3 中興大學 100 128 700

M-4 中興大學 100 128 700

M-5 中央大學 10 128 450

M-6 中山大學 10 128 167

Network Traffic Time

Heaviest 12：00 PM

Lightest 06：00 AM

Network Traffic

網路工作 M-1 M-2 M-3 M-4 M-5 M-6

時刻時間 (中興) (中興) (中興) (中興) (中央) (中山)

反應時間 11.39 10.55 8.41 8.28 15.03 18.03

尖峰通訊時間 5.53 5.51 5.4 5.39 7.72 7.93

成圖時間 5.86 5.04 3.01 2.89 7.31 10.1

反應時間 11.37 10.57 8.43 8.33 14.93 17.95

離峰通訊時間 5.5 5.47 5.4 5.36 7.66 7.92

成圖時間 5.87 5.1 3.03 2.97 7.27 10.03

Timing for 200 Operations in Seconds

※ Bottleneck of Real Time Collaboration ※

Network Transmission Speed Collaboration is proceeded by sending the control parameters with small amounts of data, being independent on the network transmission speed.

Hardware in the Client Side Complex models require high-performance hardware in the client side to reach real time collaboration.

System Bottleneck System bottleneck is at the speed of hardware capability in the client side, not depending on network transmission speed.

<VI>

CSCV Snapshots

An Example for NPR Rendering

<VII>

Future Work

Collaborative Model-Editing.

More NPR Rendering.

Further Performance Analysis.

Security Improvement.

System Maintenance.

※ Future Work (1) ※

Middle Tier

Business Logic

User Interface

EIS Tier

EnterpriseInformation

Service

Client Tier

Web Browser

ASP

Middle Tier

Business Logic

User Interface

EJB

JSP

EIS Tier

EnterpriseInformation

Service

Client Tier

Web Browser

Tran

sp

lan

t

※ Future Work (2) ※

T D C S V SThanks!Q & A

computer supported collaborative visualization c s c v sun-in lin [email protected]

Documents

crossplatform system

global execution architecture

member server member

member client cv server

cv service

cv server5

cv client6

different time