1. Scientific Visualization

2. What is Scientific Visualization?
Visualization for scientific computing, shortened to scientific visualization, was coined in 1987 and refers to the science or methodology of quickly and effectively displaying scientific data.
1987 NSF report: “Visualization in Scientific Computing”
Formal name given to the field in computer science that includes user interface, data representation and processing algorithms, visual representations and other sensory presentation such as sound or touch.

3. Motivation
In computational science we can use distributed computers and powerful clusters to simulate complex and realistic problems.
It is difficult for the human brain to make sense out of the large volume of numbers
Can we enhance and improve scientific productivity by utilizing human visual perception and computer graphics techniques?
What can we do with the resulting numbers, formulas and data?

4. Scientific Visualization vs. Data Visualization
graphical representations from the results of mathematical models, computations and simulations
Involves research in computer graphics, image processing, high performance computing, and other areas
It's not just a pretty picture or animation
Data Visualization:
More general term
Implies treatment of data source beyond science and engineering, such as financial, business data, etc.
Visualization is not only looking into a pretty picture…
understanding of the data
been able to analyze and interpret data
Spot Noise

5. Applications Used in: Engineering Computational Fluid Dynamics
Simulation
Medical Imaging
Geospatial
Ground Water Modeling
Oil and Gas Exploration and Production
and more…

6. Concepts associated with Visualization
Personal visualization: analyze results, graphics in your PC.
High-resolution displays: visualization of large-data sets.
Immersive visualization: an environment where the user is immersed in the computer generated 3D graphics.
Collaborative visualization: two or more users visualize the same data using different displays.

7. Concepts associated with Visualization (cont.)
From NASA
Stereo Displays:
Active Stereo:
Polarized
Anaglyphic
Holographic/Auto-stereoscopic displays
multiple viewpoints at the same time
Head-mounted displays
two small monitors integrated into a headset which stimulate a large part of the user's field of view
HMD

8. “Trivial” Examples 2D plot 3D plot Matlab t = 0:0.01:5; y = sin(4*t);
plot(t,y);
3D plot
[x,y] = meshgrid(-2:.1:2, -2:.1:2);
z = x .* exp(-x.^2 - y.^2);
mesh(z)

9. More advance example Animation in Matlab
From

10. Other techniques 3D points Result:X Y Z
101.32
98.2
43.2
102.01
46.4 …. …
Result:
A 3D object that we ca can visualize

11. Hardware Hardware for large data sets Stereo Visualization
Supercomputer
Clusters with commodity hardware
Stereo Visualization
ImmersaDesk
Do we need supercomputers?
What about Nvidia/ATI video cards in a PC or cluster?

12. Some Visualization Tools

13. Amira in Medical
Advanced 3D visualization and volume modeling tool to process 3D data sets
It allows you to gain detailed insight into your data. Graphics hardware support is utilized to display even very large data sets at interactive speed
It mainly use in visualize 3D images data such as CT, MR, confocal, microscopy

14. The image depicts a surface model of the human head and the brain created from an MRI data set. Amira provides a "realistic" transparency mode for surface display (outer surface). Arbitrary fields can be mapped onto the surface (inner surface).

15. General relativistic simulation of gravitational energy
General relativistic simulation of gravitational energy. Visualization by W. Benger, Simulation by AEI Potsdam

16. Designing Video Games

19. Vis5D - Weather
Vis5D is a system for interactive visualization of large 5-D gridded data sets such as those produced by numerical weather models. One can make isosurfaces, contour line slices, colored slices, volume renderings, etc of data in a 3-D grid, then rotate and animate the images in real time. There's also a feature for wind trajectory tracing, a way to make text anotations for publications, support for interactive data analysis, etc.

22. FieldView – Fluid Dynamics
FieldView is the World's Leading Post-processing and Visualization for Computational Fluid Dynamics

23. It illustrates the Velocity profile within an Engine Block

24. This is one of a series of images used by Lockheed Martin at the 1997 Paris Air Show.   An animation was created with FieldView, and projected onto a scale model of an F22 aircraft.

25. Pressure contours and velocity vectors on an F18
Pressure contours and velocity vectors on an F18. - Data courtesy Nasa Langley Research Center

26. References www.ssec.wisc.edu/~billh/vis5d.html www.amiravis.com