introduction to animation · introduction to scientific visualization scientific visualization...

IS&T Scientific Visualization Tutorial

Erik Brisson

ebrisson@bu.edu

Introduction to Scientific Visualization

Topics

Introduction

Visualization techniques

Scientific data domains

Software packages and workflow

Conclusion

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

The Visualization Pipeline

Math Proc Scientific visualization Computer Graphics

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

The Visualization Pipeline -

Hardware

Field instruments

Scientists/programmers

Supercomputers

Graphics machines

Publications, movies/DVDs, web

Demos, educational software

The Visualization Pipeline - Software

Data acquisition and preparation

Sci-vis tools

Geometric Representation

Rendering

Post-processing

Scalar data in 3D: As points

Scalar data: Cutplanes

Scalar data: Regions of Interest

Scalar data: Isosurface w/ROI

Transparent isosurface w/cutplanes

Colored isosurface w/cutplanes

Colored transp isosurface w/cutplanes

Multi isosurfaces w/cutplanes

Technique: Mapping onto isosurface

Technique: Volume Visualization

Vector data in 3D: Vector glyphs

Technique: Vector field streaklines

Technique: Vector field ribbons

Scientific data domains

Regular grid topology

Irregular grid topology

Software Tools and the Pipeline

Data Matlab VTK OSG Maya

IDL Paraview Performer OpenGL

Gnuplot DAFFIE Display Wall

Xmgrace Web

Excel Photoshop

Premier

Visualization Packages

Matlab for visualization

Paraview

OpenGL

OpenSceneGraph

DAFFIE and the display wall

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

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

OpenGL

Widely supported at hardware level

Access to all graphics card features

Program from scratch

Only option for some large applications

OpenGL – primitives

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

OpenSceneGraph

Maya screenshot

The BU DVD Wall

24 projectors

24 Linux machines

Passive stereo

One “head node”

Localized sound

Wireless navigation

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?

Many possible workflows

Data Matlab VTK OpenGL Maya

IDL Paraview OSG Photoshop

Gnuplot DAFFIE Performer Premier

Xmgrace

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

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

showing entropy

Isosurfaces in IDL

Convert output into .obj

Render in Maya, with transparency

View in 3D on Wall

stretched water

Given positions of atoms in water

How to show “holes”?

Construct volume data of distance

Use volume visualization

Researchers used OpenDX

SCV staff modified OpenDX networks

Produced wall movies and demos

Corporate Connections

Researchers provided data

SCV staff wrote custom viewing code

Artworld “family portrait”

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 – ebrisson@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

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