1. Hank Childs, University of Oregon Volume Rendering Primer / Intro to VisIt

3. Announcements Volume rendering lectures: preview today, more next week VisIt lectures: today, Friday Project proposal (whoops): – WEBSITE SAID NOV 15 th – WEBSITE SAID IT WOULD BE GRADED – 510: due Weds Nov 11 th – 410: due Tues Nov 17 th Class canceled Mon Nov 16 th JB^2?

4. Project #7A You write VTK program. – I expect that your answers will be partially derived from previous VTK programs – Python OK 4 renderers in 1 window isosurface three slices hedgehogs streamlines

5. Project 7A Ben Mood project, F13

6. Project 7B (510 only)

7. Final Project Two general flavors: – Here is some data I find interesting and I want to visualize Data source: – Find yourself – I have some How to visualize: – Use VTK – Use VisIt – Other – Here is a visualization algorithm I want to implement

8. Aneurysm data set

9. Water Dam data set

10. Explore Data Aneurysm – http://visitusers.org/index.php?title=Blood_Flow_ Aneurysm_Tutorial_Dataset_Exploration http://visitusers.org/index.php?title=Blood_Flow_ Aneurysm_Tutorial_Dataset_Exploration Water flow – http://visitusers.org/index.php?title=Water_Flow _Tutorial http://visitusers.org/index.php?title=Water_Flow _Tutorial

11. Volume Rendering Primer Goal: get you enough information to make a decision whether to do self-defined project or pre-defined project Volume rendering project: – implement – make some pictures – do a performance study

12. X-rays Emitter Film/image Plotting Techniques

13. Volume rendering Important visualization technique for 3D data Use combination of color and transparency to see entire 3D data set at one time.

14. Volume rendering overview Camera Pixels on the screen 3D data

15. Volume rendering overview Camera Pixels on the screen 3D data Ray casting game plan: For every pixel on the screen, Find ray for that pixel Intersect volume with ray Calculate color from intersection Assign color to pixel Ray casting game plan: For every pixel on the screen, Find ray for that pixel Intersect volume with ray Calculate color from intersection Assign color to pixel

16. VisIt Overview PPT material Live demo

17. Tutorial materials http://visitusers.org/index.php?title=VisIt_Tutorial

18. 18 LLNL-PRES-ZZZZZZ  Production end-user tool supporting scientific and engineering applications.  Provides an infrastructure for parallel post-processing that scales from desktops to massive HPC clusters.  Source released under a BSD style license. Density Isovolume of a 3K^3 (27 billion cell) dataset Density Isovolume of a 3K^3 (27 billion cell) dataset Project Introduction

19. 19 LLNL-PRES-ZZZZZZ Data Exploration Presentation Graphics Visual Debugging Visual Debugging Comparative Analysis = ? Quantitative Analysis Project Introduction

20. 20 LLNL-PRES-ZZZZZZ  The VisIt project started in 2000 to support LLNL’s large scale ASC physics codes.  The project grew beyond LLNL and ASC with research and development from DOE SciDAC and other efforts.  VisIt is now supported by multiple organizations: LLNL, LBNL, ORNL, UC Davis, Univ of Utah, Intelligent Light, …  Over 75 person years of effort, 1.5+ million lines of code. Project StartedLLNL ASC users transitioned to VisIt 2005 R&D 100VACET FundedTransition to Public SW repo VisIt 2.0 Release 200020032005200620082010 2012 - 2017 Project Introduction

21. 21 LLNL-PRES-ZZZZZZ MachineArchitectureProblem Size# of Cores GraphX86_6420,001 3 (8 T cells)12K DawnBG/P15,871 3 (4 T cells)64K FranklinCray XT412,596 3 (2 T cells)32K JaguarPFCray XT512,596 3 (2 T cells)32K JunoX86_6410,000 3 (1 T cells)16K FranklinCray XT410,000 3 (1 T cells)16K RangerSun10,000 3 (1 T cells)16K PurpleIBM P58,000 3 (0.5 T cells)8K Scaling Studies of Isosurface Extraction and Volume Rendering (2009) VisIt is also used daily by domain scientists. Project Introduction

22. 22 LLNL-PRES-ZZZZZZ  Regular releases (~ 6 / year) Executables for all major platforms End-to-end build process script ``build_visit’’  User Support and Training visitusers.org, wiki for users and developers Email lists: visit-users, visit-developers Beginner and advanced tutorials VisIt class with detailed exercises  Documentation “Getting data into VisIt ” manual Python interface manual Users reference manual Slides from the VisIt class Project Introduction

23. 23 LLNL-PRES-ZZZZZZ  Databases: How datasets are read  Plots: How you render data  Operators: How you manipulate data  Expressions: Mechanism for generating derived quantities  Queries: How to access quantitative information Example VisIt Pipelines

24. 24 LLNL-PRES-ZZZZZZ  Databases: how you read data  Plots: how you render data  Operators: how you transform/manipula te data  Expressions: how you create new fields  Queries: how you pull out quantitative information Open a database, which reads from a file (example: open file1.hdf5) Database Make a plot of a variable in the database (example: Volume plot) Plot Example VisIt Pipelines

25. 25 LLNL-PRES-ZZZZZZ  Databases: how you read data  Plots: how you render data  Operators: how you transform/manipula te data  Expressions: how you create new fields  Queries: how you pull out quantitative information Open a database, which reads from a file (example: open file1.hdf5) Database Plot a variable in the database (example: Pseudocolor plot) Plot Apply an operator to transform the data (example: Slice operator) Operator Example VisIt Pipelines

26. 26 LLNL-PRES-ZZZZZZ  Databases: how you read data  Plots: how you render data  Operators: how you transform/manipula te data  Expressions: how you create new fields  Queries: how you pull out quantitative information Open a database, which reads from a file (example: open file1.hdf5) Database Plot a variable in the database (example: Pseudocolor plot) Plot Apply an operator to transform the data (example: Slice operator) Operator 1 Apply a second operator to transform the data (example: Elevate operator) Operator 2 Example VisIt Pipelines

27. 27 LLNL-PRES-ZZZZZZ  Databases: how you read data  Plots: how you render data  Operators: how you transform/manipula te data  Expressions: how you create new fields  Queries: how you pull out quantitative information Open a database, which reads from a file (example: open file1.hdf5) Database Plot the expression variable (example: Pseudocolor plot) Plot Create derived quantities from fields in the file (example: magnitude(velocity)) Expression Example VisIt Pipelines

28. 28 LLNL-PRES-ZZZZZZ  Databases: how you read data  Plots: how you render data  Operators: how you transform/manipula te data  Expressions: how you create new fields  Queries: how you pull out quantitative information Open a database, which reads from a file (example: open file1.hdf5) Database Extract quantitative information (example: integrate density to find mass) Query Plot a field from the file (example: density + Pseudocolor plot) Plot Example VisIt Pipelines

29. 29 LLNL-PRES-ZZZZZZ  Databases: how you read data  Plots: how you render data  Operators: how you transform/manipula te data  Expressions: how you create new fields  Queries: how you pull out quantitative information Open a database, which reads from a file (example: open file1.hdf5) Database Create derived quantities from fields in the file (example: magnitude(velocity)) Expression Apply an operator to transform the data (example: Slice operator) Operator 1 Apply a second operator to transform the data (example: Elevate operator) Operator 2 Plot a field (example: speed + Pseudocolor plot) Plot Extract quantitative information (example: maximum speed over cross-section) Query Example VisIt Pipelines