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Visualization with Paraview Before We Begin… Visualization with ParaView Before we begin… • Make sure you have ParaView 4.1.0 installed so you can follow along in the lab section – http://paraview.org/paraview/resources/software.php Background • http://www.paraview.org/ • Open-source, multi-platform parallel data analysis and visualization application • Mature, feature-rich interface • Good for general-purpose, rapid visualization • Built upon the Visualization ToolKit (VTK) library • Primary contributors: – Kitware, Inc. – Sandia National Laboratory – Los Alamos National Laboratory – Army Research Laboratory Data Types * • Supports a wide variety of data types – Structured grids • uniform rectilinear, non-uniform rectilinear, and curvilinear – Unstructured grids – Polygonal data – Images – Multi-block – AMR • Time series support 1.3. MORE INFORMATION 7 U nst ruct ured Grid Unstructured data sets are composed of points, lines, 2D polygons, 3D tetrahedra, and nonlinear cells. They are similar to polygonal data except that they can also represent 3D tetrahedra and nonlinear cells, which cannot be directly render ed. *http://www.paraview.org/Wiki/images/c/c6/ParaViewTutorial312.pdf In addition to these basic data types, ParaView also supports mult i- block data. A basic multi-block data set is created whenever data sets are grouped together or whenever a file containing multiple blocks is read. ParaView also has some special data types for representing H ierar chical A daptive M esh Refinement (AMR), H ierarchical U niform A M R, Oct ree, Tablular ,and Gr aph type data sets. 1.3 M or e I nfor mat ion There are many places to find more information about ParaView. The Para- View Users Manual is online and is located at The ParaView User’s Guide. ParaView also has an online help that can be accessed by simply clicking the button in the application. The ParaView web page, www.paraview.org, is also an excellent place to find more information about ParaView. From there you can find helpful links to mailing lists, Wiki pages, and frequently asked questions as well as information about professional support services. Visualization Algorithms • Supports a wide variety of visualization algorithms -> Filters – Isosurfaces – Cutting planes – Streamlines – Glyphs – Volume rendering – Clipping – Height maps – … Special Features • Supports derived variables – New scalar / vector variables that are functions of existing variables in your data set • Scriptable via Python • Saves animations • Can run in parallel / distributed mode for large data visualization Data Formats • Supports a wide variety of data formats – VTK (http://www.vtk.org/VTK/img/file-formats.pdf) – EnSight – Plot3D – Various polygonal formats • Users can write data readers to extend support to other formats • Conversion to the VTK format is straightforward Data Formats • VTK Simple Legacy Format • ASCII or binary • Supports all VTK grid types • Easiest for data conversion • Note: use VTK XML format for parallel I/O VTK simple legacy format (http://www.vtk.org/VTK/img/file-formats.pdf) Data Formatting Example • Data set: 4x4x4 rectilinear grid with one scalar variable ParaView Visualization Pipeline • All processing operations (filters) produce data sets • Can further process the result of every operation to build complex visualizations – e.g. can extract a cutting plane, and apply glyphs (i.e. vector arrows) to the result • Gives a plane of glyphs through your 3D volume Demonstration • WRF weather forecast data set – Rectilinear grid – Multiple scalar and vector variables – Time series • Can show: – Clouds – Wind – Temperature – … ParaView Test-Drive Getting Started • Download example data file • ‘disk_out_ref.ex2’ – http://portal.longhorn.tacc.utexas.edu/training/ – Right-click, Save link as… • Open ParaView (well, this is a Mac) ParaView Menu Bar Toolbars Pipeline Browser Object Inspector 3D View ParaView Undo/Redo Camera Controls View Controls (undo/redo) VCR Controls Common Controls Active Variable Controls ParaView Today we will: • Create isosurfaces for a scalar variable • Clip and slice the surfaces • Use glyphs to display a vector field • Use streamlines to show flow through a vector field • Edit color maps • Add slices to show variable values over a plane • Add color legends • Create volume rendering • Create a plot over a line ParaView Open the file disk_out_ref.ex2 • Click File -> Open • Select disk_out_ref.ex2 • Click OK • Select ALL variables • Click blue Apply • Cylinder outline of dataset extent displayed ParaView Open the file disk_out_ref.ex2 • Click File -> Open • Select disk_out_ref.ex2 and click OK ParaView Open the file disk_out_ref.ex2 • Click File -> Open • Select disk_out_ref.ex2 and click OK • Select ALL variables ParaView Open the file disk_out_ref.ex2 • Click File -> Open • Select disk_out_ref.ex2 • Click OK • Select ALL variables • Click blue Apply ParaView Open the file disk_out_ref.ex2 • Click File -> Open • Select disk_out_ref.ex2 • Click OK • Select ALL variables • Click blue Apply Cylinder outline of dataset extent displayed ParaView Manipulate Representation and color • Use the Active Variable Controls to change color Solid Color -> Pres ParaView Manipulate Representation and color • Use the Active Variable Controls to change color Solid Color -> Pres ParaView Manipulate Representation and color • Use the Active Variable Controls to change color Solid Color -> Pres • Use Representation toolbar to change representation Surface -> Surface With Edges ParaView Manipulate Representation and color • Use the Active Variable Controls to change color Solid Color -> Pres • Use Representation toolbar to change representation Surface -> Surface With Edges ParaView Manipulate Representation and color • Use the Active Variable Controls to change color Solid Color -> Pres • Use Representation toolbar to change representation Surface -> Surface With Edges • Show Colorbar annotation ParaView Manipulate Representation and color • Use the Active Variable Controls to change color Solid Color -> Pres • Use Representation toolbar to change representation Surface -> Surface With Edges • Show Colorbar annotation ParaView • Explore dataset with mouse • Click +Z view button ParaView • Explore dataset with mouse • Click +Z view button • Huh? ParaView • Explore dataset with mouse • Click +Z view button • Huh? • Move it around ParaView • Explore dataset with mouse • Click +Z view button • Huh? • Move it around • Change Representation ParaView Filters • Click Filters on menu bar and find Contour – Alphabetical – Common (Or on toolbar) ParaView Filters • Click Filters on menu bar and find Contour – Alphabetical – Common (Or on toolbar) • Contour by AsH3 ParaView Filters • ClickClick Filters on menu bar and find Contour – Alphabetical – Common (Or on toolbar) • Contour by AsH3 • Hit Apply ParaView Filters • With Contour1 selected, use Active Variable Control to color by CH4 • And drag one of the colorbars elsewhere ParaView Filters • With Contour1 selected, use Active Variable Control to color by CH4 • And drag one of the colorbars elsewhere ParaView Filters (2) • Click Filters on menu bar and find Clip – Alphabetical – Common (Or on toolbar) ParaView Filters (2) • Choose orientation axes ParaView Filters (2) • Hit Apply • Note: all three objects are visible – Wireframe of dataset – Contour surface – Surface of clipped dataset ParaView Color Mapping • Select Clip1 ParaView Color Mapping • Select Edit Color Map ParaView Color Mapping • Select Edit Color Map ParaView Color Mapping • Select Choose Preset ParaView Color Mapping • Select Choose Preset ParaView Color Mapping • Select Black-Body R… and Update ParaView Color Mapping • Select Black-Body R… and Close ParaView Color Mapping • Close Colormap window ParaView Filters (3) • Select original dataset • Click Filters on menu bar and find Stream Tracer – Alphabetical – Common (Or on toolbar) ParaView Filters (3) • Scroll down on Properties pane until you see seeds sub-pane ParaView Filters (3) • Change Point Source to High Resolution Line Source • Update ParaView Filters (3) • You can manipulate the ‘rake’ interactively • You can change the number of seed points • You can change the interpolation method yadda yadda ParaView Filters (3) • With StreamTracer1 selected, • Click Filters on menu bar and find Tube – Alphabetical – ? • Update ParaView Filters (3) ParaView Filters (3) • Turn on Wire Frame of original dataset • Hide Tube’d Stream lines ParaView Glyphs • With original dataset selected… • Click Filters on menu bar and find Glyph – Alphabetical – Common (Or on toolbar) • Apply ParaView Glyphs • A bunch of points are selected, sampled from the dataset and an Arrow glyph is applied • Note V vectors and Arrow glyph type; Scalars option is not enabled ParaView Glyphs • Scroll down in properties window and change Scale Mode to scalar • Scroll back … • Set Glyph Type to sphere • Choose any variable and Apply ParaView Glyphs Spheres radii are proportional to value or magnitude ParaView Glyphs • With the Glyphs selected… • Edit->Change Input… ParaView Glyphs • Select the Stream Trace, Apply ParaView Glyphs Note dependency tree • With the Glyph selected, change Scale Mode to Vector, Glyph Type to Arrow, and choose variable v • Apply ParaView Glyphs Glyphs are now tangential arrows ParaView Volume Rendering • Delete everything except original dataset • Set Representation to Volume ParaView Volume Rendering • Open Colormap Editor • Fiddle Opacity Transfer Function ParaView Volume Rendering • … to look like this • Close Colormap Editor ParaView Volume Rendering • And we can then
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