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Distributed VR Architectures. 2003. 12. 5 임형준. index. Multipipeline Synchronization graphics and haptics pipelines synchronization Colocated Rendering Pipelines multipipe graphics cards PC clusters Distributed Virtual Environments network types topologies.

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Distributed vr architectures l.jpg

Distributed VR Architectures

2003. 12. 5

임형준


Index l.jpg
index

  • Multipipeline Synchronization

    • graphics and haptics pipelines synchronization

  • Colocated Rendering Pipelines

    • multipipe graphics cards

    • PC clusters

  • Distributed Virtual Environments

    • network types

    • topologies


1 multipipeline synchronization l.jpg
1. Multipipeline Synchronization

  • Distributed VR engine

    • use two or more rendering pipelines

    • pipelines perform graphics or haptics computations

    • on a single compute or multiple computers

  • Different synchronization approach

    • software

    • frame buffer

    • video


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1. Multipipeline Synchronization

  • Need external signal : genlock


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1. Multipipeline Synchronization

  • Synchronization between two heterogeneous pipelines : graphics and haptics

  • Force computation

    • on the host computer

    • on the embedded processor in haptic interface controller

  • Different output rates

    • haptics rendering is much faster than graphics rendering


2 colocated rendering pipelines l.jpg
2. Colocated Rendering Pipelines

  • Multipipe graphics cards

  • Multiple single-pipe graphics cards

    • in a single PC

    • sharing CPU, main memory, and bus bandwidth

    • cheaper alternative to the master-slave model

  • Single multipipe graphics cards

    • cheaper than using single-pipe graphics cards

    • Wildcat II 5110 :

      • synchronization without genlock

      • “parascale” (parallel and scalable)


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2. Colocated Rendering Pipelines

  • Wildcat architecture


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2. Colocated Rendering Pipelines

  • Problem in single PC system

    • not proper for large number of displays

    • resolution goes down

  • Solution

    • large, multipipeline workstations

  • Better choice : PC cluster

    • synchronization by a control server

    • the more PCs, the slower refresh rate


2 colocated rendering pipelines9 l.jpg
2. Colocated Rendering Pipelines

  • Example : Chromium system

  • WireGL

    • runs on control server

    • communicates with rendering servers (PCs)

    • forks OpenGL commands to the corresponding PC


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3. Distributed Virtual Environments

  • A virtual environment which resides on two or more networked computers

  • Collaborative distributed VE

    • take turns performing a task

    • only one user interacts with an object at a time

  • Cooperative distributed VE

    • users interact with an object simultaneously



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3. Distributed Virtual Environments

  • Basic communication between two PCs

    • each PC has an identical copy of virtual environment

    • transmit any changes

    • buffering

  • Network topologies

    • server-client model

    • peer-to-peer model


3 distributed virtual environments13 l.jpg

server

client2

client3

client1

3. Distributed Virtual Environments

  • Server-client model

    • single server

    • multiple servers


3 distributed virtual environments14 l.jpg

client2

client3

client1

client4

client5

client3

client5

client4

client1

client2

LAN

3. Distributed Virtual Environments

  • Peer-to-peer model


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