Case Histories, Erik Brisson Scientific Computing and Visualization: Linux Clusters and Tiled Display Walls July 30 – August 1, 2002 Slide 1 Case Histories.

Case Histories, Erik BrissonScientific Computing and Visualization:Linux Clusters and Tiled Display Walls

July 30 – August 1, 2002 Slide 1

Case Histories

Erik BrissonAssociate Director

Scientific Computing and Visualization GroupBoston University



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



Collaboration Paradigms

• Assist users in development

• Implement custom programs for users

• Develop infrastructure for community use

• Visualize data using infrastructure



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



System Paradigms for Tiled Walls



Examples

• Schroedinger wave function

• Ventricular defibrillation

• Molecular dynamics

• Stitch Wall Project

• Turbine Simulation



Schroedinger wave function



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 Ray’s stereo template• Outcome: A sequence of visualizations of experiments

on the DVDW



Paradigm: WireGL, no navigation



Ventricular Defibrillation



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



Paradigm: WireGL with navigation



Molecular Dynamics



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



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



Paradigm: WireGL with navigation



Stitch Wall Project



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



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



Paradigm: DAFFIE / Stitch viewer



Turbine Simulation



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



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)



Paradigm: DAFFIE with Geometry-on-the-fly



Paradigm: DAFFIE without Geometry-on-the-fly



Conclusion

• Variety of paradigms– Computation– Bandwidth– Caching

• Straight-forward for general users

• Rich for power users

• Keep data in simple, reusable format



Future Work

• Infrastructure for new users

• Port existing applications

• Expand interaction

• Extend DAFFIE

• Integrate with Access Grid

Case Histories, Erik Brisson Scientific Computing and Visualization: Linux Clusters and Tiled Display Walls July 30 – August 1, 2002 Slide 1 Case Histories.

Documents

tiled display walls

infrastructure slide

navigation slide

dvdw slide

linux clusters

existing data

collaboration paradigms

system paradigms