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

IS&T Scientific Visualization Tutorial

Erik Brisson

[email protected]

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

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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

IDL

VTK

Paraview

OpenGL

OpenSceneGraph

Maya

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

Excel

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


CISM


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 – [email protected]

Tutorial presentations and examples online:

– www.bu.edu/tech/research/training/presentations/list/

Online evaluation:

– http://scv.bu.edu/survey/tutorial_evaluation.html


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

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