Case Histories

1
Case Histories

• Erik Brisson
• Associate Director
• Scientific Computing and Visualization Group
• Boston University

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Overview

• At early stage in development cycle
• Demonstrate in this section
• Various paradigms of collaboration
• Various paradigms of programs
• How to use existing data, i.e.,
• the meandering path of data and demos

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Collaboration Paradigms

• Assist users in development
• Implement custom programs for users
• Develop infrastructure for community use
• Visualize data using infrastructure

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System Paradigms for Tiled Walls

• Tasks
• Computation (sci data production)
• Visualization (sci data to graphics data)
• Rendering (graphics data to frame buffer)
• Issues
• Where are these tasks performed / distributed
• Frame synchronization
• Data synchronization

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System Paradigms for Tiled Walls
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Examples

• Schroedinger wave function
• Ventricular defibrillation
• Molecular dynamics
• Stitch Wall Project
• Turbine Simulation

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Schroedinger wave function
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Schroedinger wave function

• Researcher Professor Claudio Rebbi
• SCV staff members Mike Walterman, Ray Gasser
• Purpose Illustrate the evolution of the wave
  function of a quantum mechanical particle moving
  on the plane
• History Prof. Rebbi developed OpenGL code for
  use on a workstation
• Ported to the Wall by Mike, uses Rays stereo
  template
• Outcome A sequence of visualizations of
  experiments on the DVDW

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Paradigm WireGL, no navigation
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Ventricular Defibrillation
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Ventricular Defibrillation

• Researchers Professor Sol Eisenberg and Daniel
  Mocanu
• SCV staff member Ray Gasser
• Purpose Display the electric current
  distribution during internal electric
  defibrillation
• History and method
• Daniel brought MRI data into IDEAS
• Extracted polygonal surfaces as VRML files
• Displayed on Immersadesk using DAFFIE viewer with
  Erik Brisson
• Ray has written VTK program to read and display
  the data on the Wall
• Outcome Interactive view of heart with electric
  current field lines on DVDW

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Paradigm WireGL with navigation
13
Molecular Dynamics
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Molecular Dynamics

• Researchers Claudio J. Margulis and Professor
  David F. Coker
• SCV staff members Mike Walterman, Erik Brisson
• Purpose Display Photodissociation Dynamics of
  I2 in CO2 Clusters

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Molecular Dynamics

• This research - set of output files for seven
  experiments
• Erik wrote conversion routines to take data and
  produce graphical elements (spheres - color and
  size show element) appropriate for DAFFIE viewer,
  shown on Immersadesk
• Mike wrote OpenGL / GLUT program for same data
  for Wall, used with WireGL
• Outcome Interactive WireGL display of these
  experiments on the DVDW

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Paradigm WireGL with navigation
17
Stitch Wall Project
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Stitch Wall Project

• Researchers Cindy Ludlam, MFA student in
  Sculpture Program at B.U.
• SCV staff members Laura Giannitrapani, Robert
  Putnam, Erik Brisson
• Purpose Produce 3D experience which related in
  certain ways to her physical sculpture

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Stitch Wall Project

• Method Cindy produced a number of textured forms
  (models) using Maya
• Laura was Cindy's advisor for the project,
  provided organizational structure, guidance and
  input
• Erik extended DAFFIE viewer to "grow" shapes from
  these models
• Robert produced sound, and modified DAFFIE sound
  server to play sound so that pitch was a function
  of distance
• Outcome Free-running demo of constantly changing
  ribbons on the DVDW, with an accompanying audio
  stream of localized sounds in space

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Paradigm DAFFIE / Stitch viewer
21
Turbine Simulation
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Turbine Simulation

• Turbine Simulation
• Researcher Douglas Sondak
• SCV staff members Douglas Sondak, Glenn
  Bresnahan, Erik Brisson, Mike Walterman
• Purpose Interactive generation and view of
  streaklines of flow in a turbine

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Turbine Simulation

• Method Input of particle position via a 6DOF
  input device
• See particle positions sent to turbine streakline
  program running on SP or Regatta using DAFFIE
• Turbine streakline program sends streakline data
  to Wall machines at regular intervals using
  DAFFIE
• Outcome Interactive, animated simulation showing
  streaklines on the DVDW (still to come)

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Paradigm DAFFIE with Geometry-on-the-fly
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Paradigm DAFFIE without Geometry-on-the-fly
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Conclusion

• Variety of paradigms
• Computation
• Bandwidth
• Caching
• Straight-forward for general users
• Rich for power users
• Keep data in simple, reusable format

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Future Work

• Infrastructure for new users
• Port existing applications
• Expand interaction
• Extend DAFFIE
• Integrate with Access Grid