Python How To¶

Often you just need a "pointer" to an example that shows you how to do something.

Here are some snippets and examples that highlight interesting features that may help you:

Callback¶

Example Name	Comments	Image
CallBack	Setting up a callback with client data. Two different methods are demonstrated.

Camera¶

Example Name	Comments	Image
CameraModel1	Illustrate camera movement around the focal point.

CameraModel2	camera movement centered at the camera position.

CameraOrientationWidget	This 3D camera orientation widget can be used in conjunction with CameraPosition to get a nice camera position.

CameraPosition	Get the camera position while moving the image.
ResetCameraOrientation	Reset camera orientation to a previously saved orientation.

ShareCamera	Use the same camera for all renderers.

Check the VTK Version¶

Example Name	Comments	Image
CheckVTKVersion-Snippet	Check the VTK version returning `True` if the requested VTK version is >= the current version.
CheckVTKVersion-Example	Check the VTK version and provide alternatives for different VTK versions.

Coloring¶

Example Name	Comments	Image
ShareCamera	Store background colors in a vector for later extraction of the red, green and blue components.

Glyphing¶

Example Name	Comments	Image
InteractorStyleTrackballCamera	Here points are represented as glyphs.

PointToGlyph	How to represent points as glyphs.

Image¶

Example Name	Comments	Image
WriteImage	Write out an image of various types.

Multiple view ports and render windows¶

Example Name	Comments	Image
MultipleRenderWindows	Multiple Render Windows.

MultipleViewports	Multiple Viewports.

Physically Based Rendering¶

Physically based rendering sets metallicity, roughness, occlusion strength and normal scaling of the object. Textures are used to set base color, ORM, anisotropy and normals. Textures for the image based lighting and the skymap are supplied from a cubemap.

Image based lighting uses a cubemap texture to specify the environment. A Skybox is used to create the illusion of distant three-dimensional surroundings.

The results can be quite spectacular, it is hoped that these examples will help you to get started.

Example Name	Comments	Image
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.

Polydata¶

Example Name	Comments	Image
ReadPolyData	This snippet works for most PolyData.

Random¶

If you want to ensure that the same random points/colors are used in C++ and other languages then it is best to use vtkMinimalStandardRandomSequence.

Example Name	Comments	Image
HighlightWithSilhouette	Here we use randomly positioned spheres with random colors. A vtkLookupTable is filled with random colors.

Render Windows¶

Example Name	Comments	Image
Model	Multiple render windows.

Searching for relevant examples?¶

Example Name	Comments	Image
SelectExamples	Given a VTK Class and a language, select the matching examples.

StructuredDataset¶

How to visualise the information in a structured dataset. All these examples use the combustor dataset.

Example Name	Comments	Image
CombustorIsosurface	Generate an isosurface of constant flow density.

CutStructuredGrid	Cut through structured grid with plane. The cut plane is shown solid shaded. A computational plane of constant k value is shown in wireframe for comparison. The colors correspond to flow density. Cutting surfaces are not necessarily planes: implicit functions such as spheres, cylinders, and quadrics can also be used.

ProbeCombustor	Probing data in a combustor. Probes are regular arrays of 50 by 50 points that are then passed through a contouring filter.

PseudoVolumeRendering	Here we use 100 cut planes, each with an opacity of 0.05. They are then rendered back-to-front to simulate volume rendering.

Rainbow	Using different vtkLookupTables.

StreamLines	Seed streamlines with vectors from a structured grid.

StreamlinesWithLineWidget	Interact with the streamlines in the combustor dataset.

VelocityProfile	Warping the geometry of three planes to show flow momentum.

WarpCombustor	Carpet plots of combustor flow energy in a structured grid. Colors and plane displacement represent energy values.

Transforms¶

Example Name	Comments	Image
Frog	This code uses a general way of specifying transformations that can permute image and other geometric data in order to maintain proper orientation regardless of the acquisition order. See the class `SliceOrder`.