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INTRODUCTION TO VISUALIZATION. Alan B. Craig, Ph.D. Materials from: Dr. Alan Shih, Dave Bock, and Alan Craig, plus all the researchers who provided examples National Center for Supercomputing Applications University of Illinois at Urbana-Champaign. June 3, 2010. What Is Visualization?!.

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introduction to visualization
INTRODUCTION TO VISUALIZATION

Alan B. Craig, Ph.D.

Materials from: Dr. Alan Shih, Dave Bock, and Alan Craig, plus all the researchers who provided examples

National Center for Supercomputing ApplicationsUniversity of Illinois at Urbana-Champaign

June 3, 2010

what is visualization
What Is Visualization?!
  • Visualization existed before the invention of computers
  • Representation of information allowing us to perceive such information visually

Dr. Alan M. Shih

early representation
Early Representation
  • The Cave of Lascaux, France

~15,000 years old

- Tells a story

planetary orbits
Planetary Orbits
  • Tenth century
  • Inclinations of the planetary orbits as a function of time.
  • Oldest known attempt to show changing values graphically.
1987 nsf panel initiative formal definition
1987 NSF Panel Initiative - Formal Definition
  • "Visualization is a method of computing. It transforms the symbolic into the geometric, enabling researchers to observe their simulations and computations. Visualization offers a method for seeing the unseen. It enriches the process of scientific discovery and fosters profound and unexpected insights.”
  • Richard Hamming: "The purpose of computing is insight, not numbers."
  • Goal of visualization - leverage existing scientific methods by providing new scientific insight through visual methods.
why do we do it
Why do we do it?
  • Because we NEED to...
purpose of visualization
Purpose of Visualization
  • Self study / analysis
    • interactive exploration
    • gain understanding
  • Between Peers
    • Probing inside the problem domain
    • Analyzing data
    • Communicating with peers
  • Presentation to General Public
    • Overall visualization
    • Presentation of data
    • Communicating with general audience
data sources
Data Sources
  • Computational Sciences
    • Computational Fluid Dynamics
    • Computational Structured Mechanics
    • Computational Chemistry
    • Computational …..
  • Observed Data
    • Wind Tunnels
    • Field Observations
    • Space Probes

Dr. Alan M. Shih

what is visualization1
What is Visualization
  • Choice of appropriate representation
computational sciences
Computational Sciences
  • We can realize, without physical prototypes
    • the performance of a design
    • the possible outcome of a scenario
    • the physical details that we did not know or notice
  • Benefits
    • Reduces development cost
    • Reduces development time
    • Reduces development risk

Dr. Alan M. Shih

computational sciences1
Computational Sciences
  • Computers brought about the ability to collect, create, and store more information
  • Is a process of simulating a relevant subset of the laws of nature through a set of equations
  • Yields a set of numeric solutions --

Numbers, LOTS of them

  • May not be able to see, much less interpret, all of the results.

Dr. Alan M. Shih

visualization of data
Visualization of Data
  • Try to envision the domain in your mind

Dr. Alan M. Shih

visualization of data1
Visualization of Data
  • But, with some modifications to the images...

Dr. Alan M. Shih

visualization of data2
Visualization of Data
  • Interpolated vs. Non-interpolated

Dr. Alan M. Shih

interactive or batch
Interactive or Batch?
  • Interactive Visualization
    • Allows the Ability to Control in Real-Time
    • Limits the Amount of Data to Be Visualized.
    • Useful for Analysis and Exploration
  • Batch Visualization
    • High-Quality, Complex Representation
    • No Control in Real Time.
    • Useful for Presentation, Communication, high complexity
the visualization pipeline
The Visualization Pipeline
  • Data (simulated or observed)
  • Filter
  • Map to geometry
  • Viewing Attributes
  • Object Attributes
  • Render
  • Display
  • Record
  • Loop to appropriate step...
computer art and scientific visualization
Computer Art and Scientific Visualization

Cox, Donna; Patterson, Robert; Bargar, Robin; Daab, Fred; Moore, Michael; Moorman, Jan; Waegner, Chris; Erickson, Christian; Swing, Chris; Conrad, Renee; Knocke, Joel; Jordan, Robert; Brandys, Mike; Fossum, Barbara; Colby, Don; McNeil, Mike; Bajuk, Mark; Arrott, Matthew; Swanson, Amy

Researchers

Cerco, Carl; Noel, Mark; CEWES

Visualizaiton

Stein, Robert; Shih, Alan; NCSA

Dr. Alan M. Shih

static vs time varying data
Static vs. Time-Varying Data
  • Static
    • At an particular instance of time
    • Particular Point of View, etc.
  • Time-Varying Animation
    • Evolving along the time line
    • Dynamic Data or Point of View
representational techniques
Representational Techniques
  • Realistic
  • Abstract

Researchers Cooper, David; Caterpillar Inc.

Visualization Bajuk, Mark; NCSA , 1991

Researchers

Cohen, Josef

Visualization

Cox, Donna, NCSA; Ellson, Rich; Olano, Marc, Eastman Kodak:

Dr. Alan M. Shih

representation techniques
Representation Techniques

Texture Mapping

Visualization

Stein, Robert, Baker, Polly, NCSA, ongoing

Sponsored by ARL

Dr. Alan M. Shih

representation techniques1
Representation Techniques
  • Ball & Stick
  • Contour

Researchers

Herron, David, Eli Lilly & Co.

Visualization

Thingvold, Jeffrey A.; Sherman, William; NCSA , 1991

Researchers

Treutlein, Herbert; Schulten, Klaus; Physics Department Technical University of Munich

Visualization

Arrott, Matthew; NCSA, 1987

Researcher

Taylor, Lafe

Visualization

Shih, Alan, MSU, 1993

Dr. Alan M. Shih

representation techniques2
Representation Techniques
  • False Color
  • Height/Deformation

Researchers

Kovacic, David A., Romme, William H., Despain, Don G.

Visualization

Craig, Alan; NCSA, 1990

Researchers and visualization

Haber, Bob; Lee, Hae-Sung; Koh, Hyun; NCSA, 1989

Dr. Alan M. Shih

representation techniques3
Representation Techniques
  • Particulate/ Trace
  • Iso-surfaces

Researchers

Wilhelmson, Robert; Brooks, Harold; Jewett, Brian; Shaw, Crystal; Wicker, Louis; Department of

Atmospheric Science and NCSA

Visualization

Arrott, Matthew; Bajuk, Mark; Thingvold, Jeffrey; Yost, Jeffery; Bushell, Colleen; Brady, Dan;

Patterson, Bob

Produced by the Visualization Services and Development Group, NCSA

Dr. Alan M. Shih

representation techniques4
Representation Techniques

Data from Aerodynamics and Acoustics of Rotorcraft, W. J. McCroskey, Principal Investigator

Animation: FAST Particle Traces: UFAT

Dr. Alan M. Shih

scientific visualization
Scientific Visualization

Damage Structure

Researcher

Namburu, Raju, CEWES

Visualization

Boch, David; Heiland, Randy; Baker, Polly; NCSA

Stephens, Mike; CEWES

Dr. Alan M. Shih

scientific visualization1
Scientific Visualization

Damage Structure -- Animation

Researcher

Namburu, Raju, CEWES

Visualization

Boch, David; Heiland, Randy; Baker, Polly; NCSA

Stephens, Mike; CEWES

beyond visual
Beyond Visual
  • Virtual Reality Environment
    • ImmersaDesk
    • Cave
    • Fully immersive sphere
  • Haptic Devices
  • Senses of hearing and smelling

Dr. Alan M. Shih

challenging issues in scivis
Challenging Issues in SciVis
  • Visualization of Large Data Sets
    • How to deal with exabytes of data?
  • Remote Visualization
    • What is the best way to visualize large data sets on remote mainframe?
  • Interactive Computation
    • How to monitor and steer ongoing simulations?
  • Representation Techniques
    • How to represent the data that shows more information and shows it more clearly and accurately?
  • Immersive Technologies

Dr. Alan M. Shih

summary
Summary
  • The advent of computer capacity and power push the envelope of computational sciences and scientific visualization (SciVis)
  • SciVis has revolutionized the way we do sciences
  • SciVis provides scientists a process to probe into enormously large data sets, perceive incredible details of the domain, and discover unexpected insights.
  • Challenging issues in SciVis evolve, but we will continue to face them, solve the problems, and face future challenges.

Dr. Alan M. Shih

visualization tools1
Visualization Tools

Dr. Alan M. Shih

layers of information
Layers of Information

Dr. Alan M. Shih

composite representation
Composite Representation

Dr. Alan M. Shih

stereo visualization
Stereo Visualization
  • Red-Blue Glasses
    • Lost color
  • Shutter Glasses
    • 60 Hz
    • Synchronized with projected images
  • Polarized Glasses
    • Linear (Horizontal/Vertical)
    • Circular (CW/CCW)
    • Synchronized with projected images

Dr. Alan M. Shih

animations
Animations

Dr. Alan M. Shih