IS&T Scientific Visualization Tutorial Erik Brisson Introduction to Scientific Visualization

Topics Introduction Scientific data domains Visualization techniques Software packages and workflow Conclusion IS&T Scientific Visualization Tutorial

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 IS&T Scientific Visualization Tutorial

The Visualization Pipeline IS&T Scientific Visualization Tutorial Math Proc Scientific visualization Computer Graphics

The Visualization Pipeline - Hardware IS&T Scientific Visualization Tutorial Field instruments Scientists/programmers  Supercomputers  Graphics machines  Publications, movies/DVDs, web Demos, educational software

The Visualization Pipeline - Software IS&T Scientific Visualization Tutorial Data acquisition and preparation  Sci-vis tools  Geometric Representation  Rendering  Post-processing

Many possible workflows IS&T Scientific Visualization Tutorial DataMatlabVTKOSGMaya IDLParaviewPerformerOpenGL GnuplotDAFFIEDisplay Wall XmgraceWeb Excel Photoshop Premier

Scientific data domains IS&T Scientific Visualization Tutorial

Regular grid IS&T Scientific Visualization Tutorial

Perimeter grid IS&T Scientific Visualization Tutorial

Generalized grid IS&T Scientific Visualization Tutorial

General mesh IS&T Scientific Visualization Tutorial

Sample data at discrete points IS&T Scientific Visualization Tutorial

Interpolating domain - triangulation IS&T Scientific Visualization Tutorial

Interpolating domain – general polygons IS&T Scientific Visualization Tutorial

Scalar data in 3D: As points IS&T Scientific Visualization Tutorial

Scalar data: Cutplanes IS&T Scientific Visualization Tutorial

Scalar data: Regions of Interest IS&T Scientific Visualization Tutorial

Scalar data: Isosurface w/ROI IS&T Scientific Visualization Tutorial

Transparent isosurface w/cutplanes IS&T Scientific Visualization Tutorial

Colored isosurface w/cutplanes IS&T Scientific Visualization Tutorial

Colored transp isosurface w/cutplanes IS&T Scientific Visualization Tutorial

Multi isosurfaces w/cutplanes IS&T Scientific Visualization Tutorial

Technique: Mapping onto isosurface IS&T Scientific Visualization Tutorial

Technique: Volume Visualization IS&T Scientific Visualization Tutorial

Vector data in 3D: Vector glyphs IS&T Scientific Visualization Tutorial

Technique: Vector field streaklines IS&T Scientific Visualization Tutorial

Technique: Vector field ribbons IS&T Scientific Visualization Tutorial

Visualization Packages Matlab for visualization IDL VTK Paraview OpenGL OpenSceneGraph Maya DAFFIE and the display wall IS&T Scientific Visualization Tutorial

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 IS&T Scientific Visualization Tutorial

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 IS&T Scientific Visualization Tutorial

OpenGL Widely supported at hardware level Access to all graphics card features Program from scratch Only option for some large applications IS&T Scientific Visualization Tutorial

OpenGL – primitives IS&T Scientific Visualization Tutorial

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 IS&T Scientific Visualization Tutorial

OpenSceneGraph

Maya screenshot IS&T Scientific Visualization Tutorial

Maya screenshot IS&T Scientific Visualization Tutorial

The BU DVD Wall 24 projectors 24 Linux machines Passive stereo One “head node” Localized sound Wireless navigation IS&T Scientific Visualization Tutorial

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? IS&T Scientific Visualization Tutorial

Many possible workflows IS&T Scientific Visualization Tutorial DataMatlabVTKOpenGLMaya IDLParaviewOSGPhotoshop GnuplotDAFFIEPerformerPremier Xmgrace Excel

Example workflow – molecular dynamics IS&T Scientific Visualization Tutorial 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

Example workflow – pressure on turbine IS&T Scientific Visualization Tutorial 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

Example workflow – showing entropy IS&T Scientific Visualization Tutorial Isosurfaces in IDL Convert output into.obj Render in Maya, with transparency View in 3D on Wall

Example workflow – stretched water IS&T Scientific Visualization Tutorial Given positions of atoms in water How to show “holes”? Construct volume data of distance Use volume visualization

Example workflow – CISM IS&T Scientific Visualization Tutorial Researchers used OpenDX SCV staff modified OpenDX networks Produced wall movies and demos

Example workflow – Corporate Connections IS&T Scientific Visualization Tutorial Researchers provided data SCV staff wrote custom viewing code

Artworld “family portrait” IS&T Scientific Visualization Tutorial

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 Visualization Tutorials

Conclusion Contact me: Erik Brisson – Tutorial presentations and examples online: IS&T Scientific Visualization Tutorial