Introduction to Scientific Visualization
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1 Introduction to Scientific Visualization Erik Brisson
2 Topics Introduction Visualization techniques Scientific data domains Software packages and workflow Conclusion
3 What is sci-vis? Could mean many things (e.g., plotting, illustration) Combination of 3-D graphics technology and human perception of objects in space
4 The Visualization Pipeline Math Proc Scientific visualization Computer Graphics
5 The Visualization Pipeline - Hardware Field instruments Scientists/programmers Supercomputers Graphics machines Publications, movies/dvds, web Demos, educational software
6 The Visualization Pipeline - Software Data acquisition and preparation Sci-vis tools Geometric Representation Rendering Post-processing
7 Scalar data in 3D: As points
8 Scalar data: Cutplanes
9 Scalar data: Regions of Interest
10 Scalar data: Isosurface w/roi
11 Transparent isosurface w/cutplanes
12 Colored isosurface w/cutplanes
13 Colored transp isosurface w/cutplanes
14 Multi isosurfaces w/cutplanes
15 Technique: Mapping onto isosurface
16 Technique: Volume Visualization
17 Vector data in 3D: Vector glyphs
18 Technique: Vector field streaklines
19 Technique: Vector field ribbons
20 Scientific data domains
21 Regular grid topology
22 Irregular grid topology
23 Software Tools and the Pipeline Data Matlab VTK OSG Maya IDL Paraview Performer OpenGL Gnuplot DAFFIE Display Wall Xmgrace Web Excel Photoshop Premier
24 Visualization Packages Matlab for visualization IDL VTK Paraview OpenGL OpenSceneGraph Maya DAFFIE and the display wall
25 MATLAB and IDL General purpose numeric packages Data analysis, simulation, mathematics Include plotting and graphics Command line / scripting Commercial software (no source available) Widely used and well supported Available on SCF machines
26 VTK and ParaView Scientific visualization packages Open source Widely used Available on SCF machines VTK is a library, many language bindings Paraview GUI based, built on VTK
27 OpenGL Widely supported at hardware level Access to all graphics card features Program from scratch Only option for some large applications
28 OpenGL primitives
29 OpenSceneGraph Program using scene graph paradigm Lots of utility functions Open source OpenGL based Similar to SGI Performer Many utility functions Notably, 3-D file readers
30 OpenSceneGraph
31 Maya screenshot
32 Maya screenshot
33 The BU DVD Wall 24 projectors 24 Linux machines Passive stereo One head node Localized sound Wireless navigation
34 Your Project Describe your work in visual / geometric way? What is goal, e.g., web, publication, presentation? What is the time line? How much learning time can you invest? How much do you expect to use?
35 Many possible workflows Data Matlab VTK OpenGL Maya IDL Paraview OSG Photoshop Gnuplot DAFFIE Performer Premier Xmgrace Excel
36 Example workflow molecular dynamics Simulation creates data files Molecule x,y,z + type colored spheres (C program) Electron density as volume data isosurfaces (IDL).obj files Rendered in Maya
37 Example workflow pressure on turbine Simulation run on supercomputer Produced many Plot3d files C code transforms data to.obj files Rendered in Maya Processed using Imagemagick for DVD Wall movies
38 Example workflow showing entropy Isosurfaces in IDL Convert output into.obj Render in Maya, with transparency View in 3D on Wall
39 Example workflow stretched water Given positions of atoms in water How to show holes? Construct volume data of distance Use volume visualization
40 Example workflow CISM Researchers used OpenDX SCV staff modified OpenDX networks Produced wall movies and demos
41 Example workflow Corporate Connections Researchers provided data SCV staff wrote custom viewing code
42 Artworld family portrait
43 Visualization Tutorials Introduction to Scientific Visualization Scientific Visualization Using ParaView Scientific Visualization Using VTK Scientific Visualization Using MATLAB Graphics Programming in C/C++: OpenGL and OpenSceneGraph Introduction to Maya [CAS 327] Graphics and Images for Publication and Presentation
44 Conclusion Contact me: Erik Brisson Tutorial presentations and examples online: Online evaluation:
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