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Spiegel - A Visualization System for Stellar Systems

Spiegel - A Visualization System for Stellar Systems. Hans-Peter Bischof/hpb@cs.rit.edu David Merritt/drmsps@rit.edu www.grapecluster.rit.edu. Thanks To …. Students 20042 Andrew Rader Tim Peterson Christopher Stelma Pat Villacin Lewis Denizen Josiah Allen William Yu Andrew Bak

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Spiegel - A Visualization System for Stellar Systems

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  1. Spiegel - A Visualization System for Stellar Systems Hans-Peter Bischof/hpb@cs.rit.edu David Merritt/drmsps@rit.edu www.grapecluster.rit.edu

  2. Thanks To … Students 20042 • Andrew Rader • Tim Peterson • Christopher Stelma • Pat Villacin • Lewis Denizen • Josiah Allen • William Yu • Andrew Bak • Jin Fang Zhang • Trevor Blanarik Students 20041 • Jonathan Coles • Andrew Rader • Raun Krisch • Andrew Bak • Christopher Stelma • Peter Weisberg • Meng Jiang • Prachi Shinde Students 20034 • Jonathan Coles Physics Department • Peter Berczik • Andras Szell Students 20043 • Andrew Rader • Tim Peterson • Christopher Stelma • Josiah Allen • Jin Fang Zhang • Jason Diamond • Trevor Blanarik • John Kaeuper • Christopher Daniels • Lewis Denizen

  3. Agenda • Visualization Systems in general • Spiegel • Data Reduction • Future • Data Provided by • David Merritt • Peter Berczik • Andras Szell

  4. What I know about… CS Math Astro Physics

  5. Stolen From Piet

  6. Visualization System • Visualize facts and not assumptions • Interpolations are assumptions • Expert knowledge is needed • Visualization systems have to be flexible

  7. Spiegel • A visualization system for stellar systems • Controlled by a language • Distributed • No special hardware required

  8. Demonstration % make 8 load ./rknbody8b.sim camera new 1 "1" camera new 2 "2" camera new 3 "3” camera 1 lookat 0 0 0 camera 2 lookat 0 0 0 camera 3 lookat 0 0 0 camera 1 moveto 4 0.2 0.2 camera 2 moveto 0.2 0.2 5 camera 3 moveto 0.2 5 0.2

  9. Visualization System 1 0 0.2 0.3 -0.4 …… 2 0 …….. …….. [ ] Post Processing File

  10. Where does the Data come from: gravitySimulator • 32 dual-Xeon PC nodes • 32 grape cards • 4 Tflops • 14 Tbit disk space • Gigabit Interconnection

  11. Problem Description • Visualize Dense Stellar Systems: • File Format # particles simulation time { idi 0 x y z ax aY az … }+ 1 ≤ i ≤ n, idi IN { idi ti x y z ax aY az … } * idi IN, ti  Double • File size: > 10GB • Standard hardware

  12. Data Reduction • Pre-Process • Extract what is needed • Id time x y z color • Binary output • Increases I/O speed ~ 3-5 times

  13. Communication • A simple language controls the system • The language consist of primitives • More sophisticated tools use this language to solve complicated tasks • The language can be used to experiment

  14. Sprache • Designed to be open • Sprache is German for language - credit to Jonathan Coles • Example: • camera new 1 • camera 1 moveto 1 3 4 • camera rotate x y z • camera up x y z • …. • Allows to recreate ‘scenes’

  15. Intended Use of the Language • GUI produce simple statements • More sophisticated tools allow to do more sophisticated tasks • Moving through the system • Focus on specific areas • etc

  16. Use of External Tools - How Produced by Tim Peterson

  17. Use of External Tools - Stmts load ../../../theSimulation.sim14003.color.compact.binary.Z camera new 1 "ll" updateview setDeltaT 0.003 camera 1 moveto 2 -2 2 camera 1 lookat 0 0 0 thisPointInTime 0 updateview camera 1 moveto 2.0588 -1.93882 2 updateview camera 1 moveto 2.1152 -1.87533 2 updateview camera 1 moveto 2.1692 -1.80963 2 updateview camera 1 moveto 2.2208 -1.74182 2 updateview ….

  18. Use of External Tools - Movie Produced by Tim Peterson

  19. Input/Output

  20. y t tl t tr Interpolation/Extrapolation • Interpolation • Two data points are needed • Extrapolation • One data points is needed y t tp t

  21. Interpolation in Work • Data created, with  t = 0.1 •  t for the visualization was 0.01, no interpolation •  t for the visualization was 0.01, with interpolation

  22. Interpolation in Action

  23. A Movie ….

  24. Dehnen Model

  25. Plummer Model Data provided by Piet Hut

  26. Future Work - CS point of View • Coloring/Highlighting based on physical characteristics • Mass • Speed • Velocity • Energy • Add more sophisticated visualization technique - 10MB particle… • Create a better language • follow bh 1 and look at 0/1/2 • trace bh 1|2|3 • show density in increments of 1 • I need to talk to you … • Visualize more kinds of data • Means your data

  27. Future Work - What do you think of This? • Visualization of non visual aspects • Density - kernels • Gravity Lines - splines? • Gravity Waves - no idea? • What will help to understand the system better? • Can you visualize what you do not understand/know?

  28. Future Work - Standards • Format: • Plain Text • Needed for large Simulation, because of file size • Not extensible • What is if you would like to add information? • XML • Great for smaller simulation • Extensible • Would be my favorite for small systems

  29. Questions/Comments

  30. Questions/Comments

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