Cracow

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Cracow 06 Grid Workshop
Multimodal Planet Visualization on a metagrid

• Ronan Watson

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What I will talk about

• Software used Tools and Utilities
• KML server
• VRG server
• Use Case
• Video
• Questions

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Existing Visualization Tools

• Earth Visualization software
• Can be run with OpenGL
• Ported to Linux

• 3D engine written in C
• Uses OpenGL libraries
• Exporter plugins for most common modelling
  software

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Idea

• To combine the functionality of the existing
  software, Google Earth and OGRE
• To produce a visualization package that will
  simplify and increase the understanding and use
  of the Grid.

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What to map?

• Initially
• EGEE/LCG2 sites
• Get all site names
• Run a site functional test to determine active
  sites
• sftests get-GOC-sites-map
• Parse the result to get gridgates
• Perform an ldapsearch on each of the gridgate
  machines
• Parse output to get longitude and latitude

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KML

• Next step?
• To add this content to Google Earth
• Using a file format called KML
• KML
• Keyhole Markup Language
• XML grammar and file format
• modeling and storing geographic features
• points
• Lines
• images
• polygons

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KML Example

• lt?xml version1.0 encodingUTF-8?gt
  
• ltkml xmlnshttp//earth.google.com/kml/2.1gt
  ltPlacemarkgt ltnamegtStonehenge,
  Englandlt/namegt ltdescriptiongtStonehenge was built
  around 2500BClt/descriptiongt   ltPointgt
     ltcoordinatesgt1.826752,51.179045,0
  lt/coordinatesgt  lt/Pointgt  lt/Placemarkgt lt/kmlgt

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KML file

• Build site KML file
• Script to add all sites to kml file
• Add generic site building models
• Add placemark locations
• KML server
• Site kml file continually produced by grid jobs
• Uploaded periodically to server
• Download kml file from server and load to Google
  Earth

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VirtualGrid engine

• VirtualGrid engine built using OGRE libraries
• 3d navigable world
• Uses .vrg file type which contains site specific
  information

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VRG server

• VRG files continually produced by grid jobs
• Server location added to .kml site file
• VirtualGrid engine run from Google Earth

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Example Visualization Setup

• 9-node cluster
• LCG2 Worker Node software
• 2 grid sites
• VRG server
• Scalable Coherent Interconnect
• Chromium

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Use Case
users workstation
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ssh
UI
users workstation
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Submit KML Producer Job To Grid
RB
UI
users workstation
15
CE
Submit KML Producer Job To Grid
RB
users workstation
UI
16
WN
CE
Submit KML Producer Job To Grid
RB
users workstation
UI
17
WN
CE
Submit VRG Producer Job To Grid
RB
users workstation
UI
18
WN
CE
Submit VRG Producer Job To Grid
RB
users workstation
UI
CE
19
WN
CE
Submit VRG Producer Job To Grid
RB
users workstation
UI
CE
WN
20
WN
CE
Submit Render Job To VE
RB
users workstation
UI
CE
WN
21
WN
CE
Submit Render Job To VE
RB
users workstation
UI
CE
WN
CE
gridgate.cs.tcd.ie
22
WN
CE
Submit Render Job To VE
RB
users workstation
UI
CE
WN
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
23
WN
CE
Write To Lock File
RB
users workstation
UI
CE
WN
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
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Produce KML
WN
CE
RB
users workstation
UI
CE
WN
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
25
WN
CE
Transfer KML File To VE
RB
users workstation
UI
CE
WN
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
26
WN
CE
Write To Lock File
RB
users workstation
UI
CE
WN
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
27
WN
CE
Transfer VRG files to server
RB
users workstation
UI
CE
WN
VRG server
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
28
WN
CE
RB
users workstation
UI
CE
WN
VRG server
Run Google Earth Ogre Using Chromium
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
29
WN
CE
RB
users workstation
UI
CE
WN
VRG server
Fetch the .vrg files From server
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
30
WN
CE
Rendering
RB
users workstation
UI
CE
WN
VRG server
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
31
WN
CE
Rendering
RB
users workstation
UI
CE
WN
GVid Server Started
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
32
WN
CE
GVid Client Started
Rendering
RB
users workstation
UI
CE
WN
GVid Server Started
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
33
WN
CE
GVid Client Started
Rendering
RB
users workstation
UI
CE
WN
GVid Server Started
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
Video Output and Interactive Communication
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Steer Next Computation
WN
CE
GVid Client Started
Steer Next Computation
Rendering
RB
users workstation
UI
CE
WN
GVid Server Started
CE
WN
gridgate.cs.tcd.ie
vrengine.cs.tcd.ie
Video Output and Interactive Communication
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Video
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Questions?