PythonicAPI Examples¶

These examples:

• Use the improved VTK Python interface. Some information about the improved Python interface can be found here
• Are either newly crafted examples or upgrades of existing Python examples

See:

• More Pythonic VTK wrapping for the VTK Discourse discussion
• Wrap VTK properties to pythonic properties with snake_case names for the merge request

Upgrading an existing example to use the improved VTK Python interface¶

1. Copy the example from the src/Python folder into the src/PythonicAPI folder maintaining the same path structure. If there is a corresponding markdown file, copy it.
2. Copy the corresponding test image from src/Testing/Baseline/Python/ into src/Testing/Baseline/PythonicAPI/
3. Edit src/PythonicAPI.md, possibly creating a table and headings to match the original example in src/Python.
4. Upgrade the Python example.
5. The associated markdown file (if any) may need checking to ensure any links in the document remain valid.
6. Check everything is working and do a Merge Request.

Adding a new example¶

Follow the documented procedure ForDevelopers remembering that the folder to use is PythonicAPI.

VTK Classes Summary¶

This Python script, SelectExamples, will let you select examples based on a VTK Class and language. It requires Python 3.7 or later. The following tables will produce similar information.

• VTK Classes with Examples, this table is really useful when searching for example(s) using a particular class.

• VTK Classes with No Examples, please add examples in your area of expertise!

Tutorials¶

Hello World¶

Example Name	Description	Image
A hello world example	Cylinder example from the VTK Textbook and source code. A hello world example.

Simple Operations¶

Input and Output¶

Graph Formats¶

3D File Formats¶

Example Name	Description	Image
XGMLReader	Read a .gml file

Standard Formats¶

Input¶

Example Name	Description	Image
ReadAllPolyDataTypesDemo	Read all VTK polydata file types.
ReadCML	Read Chemistry Markup Language files.
ReadExodusData	A simple script for reading and viewing ExodusII data interactively.
ReadSLC	Read an SLC file.
TransientHDFReader	Read transient data written inside a vtkhdf file.

Importers¶

Example Name	Description	Image
3DSImporter	Import a 3D Studio scene that includes multiple actors.
ImportPolyDataScene	Import a polydata scene using multiblock datasets.
ImportToExport	Import a scene and optionally export the scene.

Output¶

Example Name	Description	Image
DelimitedTextWriter	Write data to a delimited file.
WritePLY
WriteSTL

Exporters¶

VTK Formats¶

Input¶

Output¶

Legacy VTK Formats¶

Example Name	Description	Image
GenericDataObjectReader	Read any type of legacy .vtk file.
ReadLegacyUnstructuredGrid	Read an unstructured grid that contains 11 linear cells.
WriteLegacyLinearCells	Write each linear cell into a legacy UnstructuredGrid file (.vtk).
WriteXMLLinearCells	Write each linear cell into an XML UnstructuredGrid file (.vtu).

Image Format¶

Input¶

Example Name	Description	Image
HDRReader	Read a high-dynamic-range imaging file.
ReadDICOM	Read DICOM file.
ReadDICOMSeries	This example demonstrates how to read a series of DICOM images and scroll through slices

Output¶

Geometric Objects¶

Example Name	Description	Image
Dodecahedron	Create a dodecahedron using vtkPolyhedron.
GeometricObjectsDemo
PipelineReuse	How to reuse a pipeline.
Planes	We create a convex hull of the planes for display purposes.
PlanesIntersection
SourceObjectsDemo	Examples of source objects that procedurally generate polygonal models. These nine images represent just some of the capability of VTK. From upper left in reading order: sphere, cone, cylinder, cube, plane, text, random point cloud, disk (with or without hole), and line source. Other polygonal source objects are available; check subclasses of vtkPolyDataAlgorithm.

Cells¶

Example Name	Description	Image
CellTypeSource	Generate tessellated cells.
ConvexPointSet	Generate a ConvexPointSet cell.
LinearCellsDemo	Linear cell types found in VTK. The numbers define the ordering of the points making the cell.
Polyhedron	Create an unstructured grid representation of a polyhedron (cube) and write it out to a file.

Sources¶

Example Name	Description	Image
EarthSource	Create the Earth.
Frustum
OrientedArrow	Orient an arrow along an arbitrary vector.
OrientedCylinder	Orient a cylinder along an arbitrary vector.
PlatonicSolids	All five platonic solids are displayed.
TessellatedBoxSource	Generate a box with tessellated sides.

Non Linear¶

Example Name	Description	Image
IsoparametricCellsDemo	Nonlinear isoparametric cell types in VTK.

Parametric Objects¶

Example Name	Description	Image
ParametricObjectsDemo	Demonstrates the Parametric classes added by Andrew Maclean and additional classes added by Tim Meehan. The parametric spline is also included. Options are provided to display single objects, add backface, add normals and print out an image.
ParametricKuenDemo	Interactively change the parameters for a Kuen Surface.

Implicit Functions and Iso-surfaces¶

Example Name	Description	Image
BooleanOperationImplicitFunctions	Demonstrate booleans of two different implicit functions
ContourTriangulator	Create a contour from a structured point set (image) and triangulate it.
DiscreteFlyingEdges3D	Generate surfaces from labeled data.
ExtractData	Implicit functions used to select data: Two ellipsoids are combined using the union operation used to select voxels from a volume. Voxels are shrunk 50 percent.
ExtractLargestIsosurface	Extract largest isosurface.
IceCream	How to use boolean combinations of implicit functions to create a model of an ice cream cone.
ImplicitQuadric	Create an ellipsoid using an implicit quadric
ImplicitSphere	Demonstrate sampling of a sphere implicit function
ImplicitSphere1	Demonstrate sampling of a sphere implicit function
Lorenz	Visualizing a Lorenz strange attractor by integrating the Lorenz equations in a volume.
MarchingCubes	Create a voxelized sphere.
SampleFunction	Sample and visualize an implicit function.
SmoothDiscreteFlyingEdges3D	Generate smooth surfaces from labeled data.

Working with 3D Data¶

Example Name	Description	Image
AlignTwoPolyDatas	Align two vtkPolyData's.
BooleanPolyDataFilters	This example performs a boolean operation (intersection, union or difference) of two PolyData using either a vtkBooleanOperationPolyDataFilter or a vtkLoopBooleanPolyDataFilter
Bottle	Model a rotationally symmetric object.
CappedSphere	Rotate an arc to create a capped sphere.
CellsInsideObject	Extract cells inside a closed surface.
CenterOfMass	Compute the center of mass of the points.
ConnectivityFilter	Color any dataset type based on connectivity.
Curvatures	Compute Gaussian, and Mean Curvatures.
CurvaturesAdjustEdges	Get the Gaussian and Mean curvatures of a surface with adjustments for edge effects.
DecimatePolyline	Decimate polyline.
DistancePolyDataFilter	Compute the distance function from one vtkPolyData to another.
ExternalContour	Get the external contour of a PolyData object.
ExtractPolyLinesFromPolyData	Extract polylines from polydata.
ExtractSelection	Extract selected points.
ExtractSelectionOriginalId	Extract selection and find the correspondence between the new and original ids.
ExtractSelectionUsingCells	Extract cell, select cell.
ExtractSelectionUsingPoints	Extract points but bring cells that are still complete with them.
Finance	Visualization of multidimensional financial data. The gray/wireframe surface represents the total data population. The red surface represents data points delinquent on loan payment.
FinanceFieldData	Visualization of multidimensional financial data. The yellow surface represents the total data population. The red surface represents data points delinquent on loan payment.
FitSplineToCutterOutput	Fit a spline to cutter output.
Glyph2D
GradientFilter	Compute the gradient of a scalar field on a data set.
ImplicitPolyDataDistance
LineOnMesh	Plot a spline on a terrain-like surface.
MergeSelections	Merge selected points.
MeshLabelImageColor	Mesh a single label from a label image. Then smooth and color the vertices according to the displacement error introduced by the smoothing.
OrientedBoundingCylinder	Create an oriented cylinder that encloses a vtkPolyData. The axis of the cylinder is aligned with the longest axis of the vtkPolyData.
Outline	Draw the bounding box of the data.
PerlinNoise
PolyDataContourToImageData
PolyDataToImageDataStencil
ResamplePolyLine
RuledSurfaceFilter
Silhouette
SmoothMeshGrid	Create a terrain with regularly spaced points and smooth it with vtkLoopSubdivisionFilter and vtkButterflySubdivisionFilter.
Spring	Rotation in combination with linear displacement and radius variation.
VertexConnectivity	Get a list of vertices attached (through an edge) to a vertex.
WarpTo	Deform geometry by warping towards a point.
WarpVector	This example warps/deflects a line.

Data Types¶

Example Name	Description	Image
CompositePolyDataMapper
OverlappingAMR	Demonstrates how to create and populate VTK's Overlapping AMR Grid type with data.

Data Type Conversions¶

Point Cloud Operations¶

Example Name	Description	Image
DensifyPoints	Add points to a point cloud.
ExtractClusters	From a set of randomly distributed spheres, extract connected clusters.
ExtractPointsDemo	Extract points inside an implicit function.
ExtractSurface	Create a surface from unorganized points using point filters.
ExtractSurfaceDemo	Create a surface from unorganized points using point filters (DEMO).
FitImplicitFunction	Extract points within a distance to an implicit function.
MaskPointsFilter	Extract points within an image mask.
SignedDistance	Compute signed distance to a point cloud.
UnsignedDistance	Compute unsigned distance to a point cloud.

Working with Meshes¶

This section includes examples of manipulating meshes.

Example Name	Description	Image
ClosedSurface	Check if a surface is closed.
DeformPointSet	Use the vtkDeformPointSet filter to deform a vtkSphereSource with arbitrary polydata.
DelaunayMesh	Two-dimensional Delaunay triangulation of a random set of points. Points and edges are shown highlighted with sphere glyphs and tubes.
DijkstraGraphGeodesicPath	Find the shortest path between two points on a mesh.
ElevationFilter	Color a mesh by height.
FillHoles	Close holes in a mesh.
FitToHeightMap	Drape a polydata over an elevation map.
GreedyTerrainDecimation	Create a mesh from an ImageData
IdentifyHoles	Close holes in a mesh and identify the holes.
PointInterpolator	Plot a scalar field of points onto a PolyData surface.

Clipping¶

Example Name	Description	Image
BoxClipStructuredPoints	Clip vtkStructuredPoints with a box. The results are unstructured grids with tetrahedra.
BoxClipUnstructuredGrid	Clip a vtkUnstructuredGrid with a box. The results are unstructured grids with tetrahedra.
ClipClosedSurface	Clip a surface with multiple planes.
ClipDataSetWithPolyData	Clip a vtkRectilinearGrid with arbitrary polydata. In this example, use a vtkConeSource to generate polydata to slice the grid, resulting in an unstructured grid.
ClipDataSetWithPolyData1	Clip a vtkRectilinearGrid with arbitrary polydata. In this example, use a vtkConeSource to generate polydata to slice the grid, resulting in an unstructured grid.
ImplicitDataSetClipping	Clip using an implicit data set.
SolidClip	Create a "solid" clip. The "ghost" of the part clipped away is also shown.
TableBasedClipDataSetWithPolyData2	Clip a vtkRectilinearGrid with a checkerboard pattern.

Working with Structured 3D Data¶

vtkImageData¶

Example Name	Description	Image
ClipVolume	Clip a volume and produce a vtkUnhstructuredGrid.
ImageWeightedSum	Add two or more images.

vtkExplicitStructuredGrid¶

Example Name	Description	Image
CreateESGrid	Create an explicit structured grid and convert this to an unstructured grid or vice versa.
LoadESGrid	Load a VTU file and convert the dataset to an explicit structured grid.

vtkStructuredGrid¶

Example Name	Description	Image
BlankPoint	Blank a point of a vtkStructuredGrid.
SGrid	Creating a structured grid dataset of a semi-cylinder. Vectors are created whose magnitude is proportional to radius and oriented in tangential direction.

vtkStructuredPoints¶

Example Name	Description	Image
Vol	Creating a image data dataset. Scalar data is generated from the equation for a sphere. Volume dimensions are 26 x 26 x 26.

vtkRectilinearGrid¶

Example Name	Description	Image
RGrid	Creating a rectilinear grid dataset. The coordinates along each axis are defined using an instance of vtkDataArray.
VisualizeRectilinearGrid	Visualize the cells of a rectilinear grid.

Working with Unstructured 3D Data¶

This section includes vtkUnstructuredGrid.

vtkUnstructuredGrid¶

Example Name	Description	Image
ClipUnstructuredGridWithPlane	Clip a UGrid with a plane.
ClipUnstructuredGridWithPlane2	Clip a UGrid with a plane.

Registration¶

Medical¶

Example Name	Description	Image
GenerateCubesFromLabels	Create cubes from labeled volume data.
GenerateModelsFromLabels	Create models from labeled volume data.
MedicalDemo1	Create a skin surface from volume data.

Surface reconstruction¶

Example Name	Description	Image
Delaunay3DDemo	Interactively adjust Alpha for Delaunay3D.

Utilities¶

Example Name	Description	Image
BoundingBox	Bounding Box construction.
BoundingBoxIntersection	Box intersection and Inside tests.
CheckVTKVersion	Check the VTK version and provide alternatives for different VTK versions.
ClassesInLang1NotInLang2	Select VTK classes with corresponding examples in one language but not in another.
FileOutputWindow	Write errors to a log file instead of the usual vtk pop-up window.
JSONColorMapToLUT	Take a JSON description of a colormap and convert it to a VTK colormap.
ColorMapToLUT	Use vtkDiscretizableColorTransferFunction to generate a VTK colormap.
DetermineActorType	Determine the type of an actor.
PCADemo	Project 2D points onto the best 1D subspace using PCA values.
PCAStatistics	Compute Principal Component Analysis (PCA) values.
RescaleReverseLUT	Demonstrate how to adjust a colormap so that the colormap scalar range matches the scalar range on the object. You can optionally reverse the colors.
ResetCameraOrientation	Reset camera orientation to a previously saved orientation.
SaveSceneToFieldData	Save a vtkCamera's state in a vtkDataSet's vtkFieldData and restore it.
SaveSceneToFile	Save a vtkCamera's state in a file and restore it.
Screenshot
SelectExamples	Given a VTK Class and a language, select the matching examples.
ShareCamera	Share a camera between multiple renderers.
VTKWithNumpy
XMLColorMapToLUT	Take an XML description of a colormap and convert it to a VTK colormap.

Arrays¶

Events¶

Math Operations¶

Graphs¶

Example Name	Description	Image
AdjacencyMatrixToEdgeTable	Convert an adjacency matrix to an edge table.
AdjacentVertexIterator	Get all vertices connected to a specified vertex.
ConstructTree	Construct a tree.
CreateTree	Create a tree and label the vertices and edges.
EdgeListIterator	Iterate over edges of a graph.
GraphToPolyData	Convert a graph to a PolyData.
LabelVerticesAndEdges	Label vertices and edges.
RandomGraphSource	Create a random graph.
SideBySideGraphs	Display two graphs side by side.
ScaleVertices	Size/scale vertices based on a data array.
SelectedVerticesAndEdges	Get a list of selected vertices and edges.
SelectedVerticesAndEdgesObserver	Get a list of selected vertices and edges using an observer of AnnotationChangedEvent.
VisualizeDirectedGraph	Visualize a directed graph.

Graph Conversions¶

Data Structures¶

Timing Demonstrations¶

KD-Tree¶

Oriented Bounding Box (OBB) Tree¶

Example Name	Description	Image
OBBTreeExtractCells	Intersect a line with an OBB Tree and display all intersected cells.

Octree¶

Modified BSP Tree¶

Example Name	Description	Image
ModifiedBSPTreeExtractCells	Intersect a line with a modified BSP Tree and display all intersected cells.

HyperTreeGrid¶

Example Name	Description	Image
HyperTreeGridSource	Create a vtkHyperTreeGrid.

VTK Concepts¶

Rendering¶

Example Name	Description	Image
ColoredSphere	A simple sphere.
GradientBackground	Demonstrates the background shading options.
InterpolateCamera	Use vtkCameraInterpolator to generate a smooth interpolation between camera views.
LayeredActors	Demonstrates the use of two linked renderers. The orientation of objects in the non active layer is linked to those in the active layer.
MotionBlur	Example of motion blur.
MultipleLayersAndWindows	Demonstrates the use of four renderers in two layers.
OutlineGlowPass	Demonstrates how to render a object in a scene with a glowing outline.
PBR_Anisotropy	Render spheres with different anisotropy values.
PBR_Clear_Coat	Render a cube with custom texture mapping and a coat normal texture.
PBR_Edge_Tint	Render spheres with different edge colors using a skybox as image based lighting.
PBR_HDR_Environment	Renders spheres with different materials using a skybox as image based lighting.
PBR_Mapping	Render a cube with custom texture mapping.
PBR_Materials	Renders spheres with different materials using a skybox as image based lighting.
PBR_Materials_Coat	Render spheres with different coat materials using a skybox as image based lighting.
PBR_Skybox	Demonstrates physically based rendering, a skybox and image based lighting.
PBR_Skybox_Texturing	Demonstrates physically based rendering, a skybox, image based lighting and texturing.
PBR_Skybox_Anisotropy	Demonstrates physically based rendering, a skybox, image based lighting, and anisotropic texturing.
StringToImageDemo	Demonstrates how to generate images from strings.
StripFran	Triangle strip examples. (a) Structured triangle mesh consisting of 134 strips each of 390 triangles. (b) Unstructured triangle mesh consisting of 2227 strips of average length 3.94, longest strip 101 triangles. Images are generated by displaying every other triangle strip.
TransformSphere	The addition of a transform filter to ColoredSphere.
TransparentBackground	Demonstrates the use of two renderers. Notice that the second (and subsequent) renderers will have a transparent background.

Lighting¶

Example Name	Description	Image
ShadowsLightsDemo	Show lights casting shadows.

Texture Mapping¶

Example Name	Description	Image
AnimateVectors	One frame from a vector field animation using texture maps.
TextureCutQuadric	Cut a quadric with boolean textures.
TextureCutSphere	Examples of texture thresholding using a boolean combination of two planes to cut nested spheres.
TexturePlane	Example of texture mapping.
TextureThreshold	Demonstrate the use of scalar thresholds to show values of flow density on three planes.

Tutorial¶

If you are new to VTK then these tutorials will help to get you started.

Visualization¶

See this tutorial for a brief explanation of the VTK terminology of mappers, actors, etc.

Example Name	Description	Image
AnnotatedCubeActor	Annotated cube.
AssignCellColorsFromLUT	Demonstrates how to assign colors to cells in a vtkPolyData structure using lookup tables.
AxisActor	Generate a single axis.
BillboardTextActor3D	Label points with billboards.
Blow	Ten frames from a blow molding finite element analysis.
CameraActor	Visualize a camera (frustum) in a scene.
CameraModel1	Illustrate camera movement around the focal point.
CameraModel2	Illustrate camera movement centered at the camera position.
CaptionActor2D	Draw a caption/bubble pointing to a particular point.
ClipSphereCylinder	A plane clipped with a sphere and an ellipse. The two transforms place each implicit function into the appropriate position. Two outputs are generated by the clipper.
ColoredAnnotatedCube	How to color the individual faces of an annotated cube.
CollisionDetection	Collison between two spheres.
CombineImportedActors	Combine actors from a scene into one actor.
CornerAnnotation	Write text in the corners of a window.
CorrectlyRenderTranslucentGeometry	Correctly Rendering Translucent Geometry.
CreateBFont	A scanned image clipped with a scalar value of 1/2 its maximum intensity produces a mixture of quadrilaterals and triangles.
CubeAxesActor	Display three orthogonal axes with with labels.
CubeAxesActor2D	This example uses the vtkCubeAxesActor2D to show your scene with axes to indicate the spatial extent of your data.
CurvaturesNormalsElevations	Gaussian and Mean curvatures of a surface with arrows colored by elevation to display the normals.
Cursor2D
Cursor3D
DataSetSurface	Cutting a hexahedron with a plane. The red line on the surface shows the cut.
DepthSortPolyData	Poly Data Depth Sorting.
DisplacementPlot	Show modal lines for a vibrating beam.
DistanceToCamera
EdgePoints	Generate points along an edge.
FastSplatter	Convolve a splat image with every point in an input image.
FireFlow	Combine geometry from a VRML file and a solution from a vtkUnstructuredGrid file.
FireFlowDemo	Combine geometry from a VRML file and a solution from a vtkUnstructuredGrid file (interactive).
FlyingHeadSlice	Flying edges used to generate contour lines.
FroggieSurface	Construct surfaces from a segmented frog dataset. Up to fifteen different surfaces may be extracted. You can turn on and off surfaces and control the camera position.
FroggieView	View surfaces of a segmented frog dataset using preprocessed *.vtk tissue files. You can turn on and off surfaces, control their opacity through the use of sliders and control the camera position.
Hanoi	Towers of Hanoi.
HanoiInitial	Towers of Hanoi - Initial configuration.
HanoiIntermediate	Towers of Hanoi - Intermediate configuration.
HeadBone	Marching cubes surface of human bone.
HyperStreamline	Example of hyperstreamlines, the four hyperstreamlines shown are integrated along the minor principal stress axis. A plane (colored with a different lookup table) is also shown.
IsosurfaceSampling	Demonstrates how to create point data on an isosurface.
Kitchen	Demonstrates stream tracing in a kitchen.
LabeledMesh	Label Mesh.
LoopShrink	A network with a loop. VTK 5.0 and later do not allow you to execute a looping visualization network; this was possible in previous versions of VTK.
MovableAxes	Movable axes.
Office	Using random point seeds to create streamlines.
OfficeA	Corresponds to Fig 9-47(a) in the VTK textbook.
OfficeTube	The stream polygon. Sweeping a polygon to form a tube.
PineRootConnectivity	Applying the connectivity filter to remove noisy isosurfaces.
PineRootConnectivityA	The isosurface, with no connectivity filter applied.
PineRootDecimation	Applying the decimation and connectivity filters to remove noisy isosurfaces and reduce data size.
PlateVibration	Demonstrates the motion of a vibrating beam.
PointDataSubdivision	Demonstrates the use of the vtkLinearSubdivisionFilter and vtkButterflySubdivisionFilter.
ProgrammableGlyphFilter	Generate a custom glyph at each point.
ProgrammableGlyphs	Generate programmable glyphs.
PseudoVolumeRendering	Here we use 20 cut planes, each with an opacity of of 0.25. They are then rendered back-to-front to simulate volume rendering.
QuadricVisualization	Visualizing a quadric function.
ReverseAccess	Demonstrates how to access the source (e.g. vtkSphereSource) of an actor reversely.
StreamlinesWithLineWidget	Using the vtkLineWidget to produce streamlines in the combustor dataset. The StartInteractionEvent turns the visibility of the streamlines on; the InteractionEvent causes the streamlines to regenerate themselves.
TensorEllipsoids	Display the scaled and oriented principal axes as tensor ellipsoids representing the stress tensor.
TransformActorCollection	Transform an actor collection.
WarpCombustor	Carpet plots of combustor flow energy in a structured grid. Colors and plane displacement represent energy values.

Working with vtkImageData¶

Example Name	Description	Image
ImageNormalize	Normalize an image.
WriteReadVtkImageData	Generate, edit and read out vtk image data.

Volume Rendering¶

Example Name	Description	Image
IntermixedUnstructuredGrid	A mix of poly data and unstructured grid volume mapping.
RayCastIsosurface	Isosufaces produced by volume rendering.

User Interaction¶

Example Name	Description	Image
AreaPicking	Area Picking.
Assembly	Combine/group actors into an assembly.
CallBack	Setting up a callback with client data. Two different methods are demonstrated.
CellPicking	Cell Picking.
EllipticalButton	Create an elliptical button.
HighlightPickedActor	Pick and highlight an actor based on mouse clicks.
HighlightSelection	Highlight selection.
HighlightWithSilhouette	Highlight a picked actor by adding a silhouette.
InteractorStyleTrackballActor
InteractorStyleTrackballCamera
MouseEvents	Subclass the interactor style.
MouseEventsObserver	Use an observer.

Working with Images¶

Example Name	Description	Image
BackgroundImage	Display an image as the "background" of a scene, and render a superquadric in front of it.
MarkKeypoints	Mark keypoints in an image.

Image Processing¶

Example Name	Description	Image
Attenuation	This MRI image illustrates attenuation that can occur due to sensor position. The artifact is removed by dividing by the attenuation profile determined manually.
EnhanceEdges	High-pass filters can extract and enhance edges in an image. Subtraction of the Laplacian (middle) from the original image (left) results in edge enhancement or a sharpening operation (right).
GaussianSmooth	Low-pass filters can be implemented as convolution with a Gaussian kernel.
HybridMedianComparison	Comparison of median and hybrid-median filters. The hybrid filter preserves corners and thin lines, better than the median filter.
IdealHighPass	This figure shows two high-pass filters in the frequency domain. The Butterworth high-pass filter has a gradual attenuation that avoids ringing produced by the ideal high-pass filter with an abrupt transition.
ImageGradient	Create an imaging pipeline to visualize gradient information.
IsoSubsample	This figure demonstrates aliasing that occurs when a high-frequency signal is subsampled. High frequencies appear as low frequency artifacts. The left image is an isosurface of a skull after subsampling. The right image used a low-pass filter before subsampling to reduce aliasing.
MorphologyComparison	This figure demonstrates various binary filters that can alter the shape of segmented regions.
ImageWarp	Combine the imaging and visualization pipelines to deform an image in the z-direction. The vtkMergeFilter is used to combine the warped surface with the original color data.
Pad	Convolution in frequency space treats the image as a periodic function. A large kernel can pick up features from both sides of the image. The left image has been padded with a constant to eliminate wraparound during convolution. On the right, mirror padding has been used to remove artificial edges introduced by borders.
VTKSpectrum	The discrete Fourier transform changes an image from the spatial domain into the frequency domain, where each pixel represents a sinusoidal function. This figure shows an image and its power spectrum displayed using a logarithmic transfer function.

Widgets¶

Example Name	Description	Image
AffineWidget	Apply an affine transformation interactively.
AngleWidget
AngleWidget2D	vtkAngleWidget + vtkAngleRepresentation2D.
BalloonWidget	Uses a vtkBalloonWidget to draw labels when the mouse stays above an actor.
BiDimensionalWidget	Used to measure a 2D (X, Y) size of some aspect of an object.
BorderWidget	2D selection, 2D box.
BoxWidget	This 3D widget defines a region of interest that is represented by an arbitrarily oriented hexahedron with interior face angles of 90 degrees (orthogonal faces). The object creates 7 handles that can be moused on and manipulated.
BoxWidget2	This 3D widget defines a region of interest that is represented by an arbitrarily oriented hexahedron with interior face angles of 90 degrees (orthogonal faces). The object creates 7 handles that can be moused on and manipulated. vtkBoxWidget2 and vtkBoxRepresentation are used in this example.
CameraOrientationWidget	Demonstrates a 3D camera orientation widget.
CaptionWidget
CheckerboardWidget	Compare two images using a checkerboard.
CompassWidget	Draws an interactive compass.
ContourWidget	Draw a contour (line) which can be deformed by the user.
DistanceWidget
ImplicitConeWidget	An interactive implicit cone widget.
ImplicitPlaneWidget2	Clip polydata with an implicit plane.
PolygonalSurfacePointPlacer	Used in conjunction with vtkContourWidget to draw curves on a surface.
RectilinearWipeWidget	Compare two images.
SphereWidget	This 3D widget defines a sphere that can be interactively placed in a scene.
SplineWidget	This example shows how to use vtkSplineWidget with a callback being used to get the length of the spline widget.

Plotting¶

Example Name	Description	Image
AreaPlot	Plot the area between two curves.
BoxChart	Box plot.
ChartMatrix	Create a marix of plots.
FunctionalBagPlot	Functional Bag Plot.
Histogram2D	2D Histogram of a vtkImageData.
HistogramBarChart	Histogram using bar chart.
LinePlot2D	Line plot of 2D data.
LinePlot3D	Line plot of 3D data.
MultiplePlots	Display multiple plots by using viewports in a single render window.
ParallelCoordinates	Parallel coordinates.
PieChart	Pie chart.
ScatterPlot	Scatter plot.
SpiderPlot	Spider plot.
StackedBar	Stacked bar.
SurfacePlot	Surface plot.

Animation¶

Example Name	Description	Image
AnimateSphere	Animate a sphere by opening it to an angle of 90°.
Animation	Move a sphere across a scene.
AnimationScene	Animation (the right way). Zoom in on a sphere.

Annotation¶

Example Name	Description	Image
TextOrigin	This example demonstrates the use of vtkVectorText and vtkFollower. vtkVectorText is used to create 3D annotation.

InfoVis¶

Example Name	Description	Image
ParallelCoordinatesView	How to use Parallel Coordinates View to plot and compare data set attributes.

PyQt¶