Introduction to Scientific Visualization Katia Oleinik koleinik@bu.edu IS&T Scientific Visualization Tutorial

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

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 3

The Visualization Pipeline Math Proc Scientific visualization Computer Graphics 191 214 206 113 134 135 101 120 135 102 119 147 113 129 165 117 131 170 125 138 170 158 168 195 219 227 246 244 251 255 249 254 255 197 202 222 157 163 187 156 161 190 165 172 200 251 255 255 188 192 204 196 200 212 234 238 250 177 181 192 218 224 246 250 255 255 252 255 251 251 255 252 245 249 250 111 114 133 122 121 155 154 151 194 182 176 220 243 240 255 253 252 255 250 251 246 254 254 252 255 255 255 255 255 255 254 254 254 255 255 255 255 255 255 254 254 254 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 249 249 249 249 249 249 252 252 252 255 221 155 255 255 255 255 255 255 255 255 255 255 255 255 253 253 253 252 252 252 252 252 252 253 253 253 255 255 255 255 255 255 255 255 255 IS&T Scientific Visualization Tutorial

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

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

Scalar data in 3D: As points IS&T Scientific Visualization Tutorial 7

Scalar data: Cutplanes IS&T Scientific Visualization Tutorial 8

Scalar data: Regions of Interest IS&T Scientific Visualization Tutorial 9

Scalar data: Isosurface w/ROI IS&T Scientific Visualization Tutorial 10

Transparent isosurface w/cutplanes IS&T Scientific Visualization Tutorial 11

Colored isosurface w/cutplanes IS&T Scientific Visualization Tutorial 12

Colored transp isosurface w/cutplanes IS&T Scientific Visualization Tutorial 13

Multi isosurfaces w/cutplanes IS&T Scientific Visualization Tutorial 14

Technique: Mapping onto isosurface IS&T Scientific Visualization Tutorial 15

Technique: Volume Visualization IS&T Scientific Visualization Tutorial 16

Vector data in 3D: Vector glyphs IS&T Scientific Visualization Tutorial 17

Technique: Vector field streaklines IS&T Scientific Visualization Tutorial 18

Technique: Vector field ribbons IS&T Scientific Visualization Tutorial 19

Scientific data domains IS&T Scientific Visualization Tutorial 20

IS&T Scientific Visualization Tutorial Regular grid topology IS&T Scientific Visualization Tutorial 21

Irregular grid topology IS&T Scientific Visualization Tutorial 22

Software Tools and the Pipeline Data Matlab VTK OSG Maya IDL Paraview Performer OpenGL Gnuplot DAFFIE Display Wall Xmgrace Web Excel Photoshop Premier 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

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

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

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

IS&T Scientific Visualization Tutorial OpenGL – primitives IS&T Scientific Visualization Tutorial 28

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

IS&T Scientific Visualization Tutorial OpenSceneGraph IS&T Scientific Visualization Tutorial

IS&T Scientific Visualization Tutorial Maya screenshot IS&T Scientific Visualization Tutorial

IS&T Scientific Visualization Tutorial Maya screenshot IS&T Scientific Visualization Tutorial

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

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 34

Many possible workflows Data Matlab VTK OpenGL Maya IDL Paraview OSG Photoshop Gnuplot DAFFIE Performer Premier Xmgrace Excel IS&T Scientific Visualization Tutorial

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 IS&T Scientific Visualization Tutorial

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 IS&T Scientific Visualization Tutorial

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

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

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

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

Artworld “family portrait” IS&T Scientific Visualization Tutorial

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 IS&T Scientific Visualization Tutorial

IS&T Scientific Visualization Tutorial Conclusion Contact me: Katia Oleinik– koleinik@bu.edu Tutorial presentations and examples online: www.bu.edu/tech/research/training/presentations/list/ Online evaluation: http://scv.bu.edu/survey/tutorial_evaluation.html IS&T Scientific Visualization Tutorial