# Development

**URL:** https://discourse.vtk.org/c/development/7.md?page=13

[Latest](https://discourse.vtk.org/latest.md) · [Categories](https://discourse.vtk.org/categories.md) · [Tags](https://discourse.vtk.org/tags.md)

**Page:** 14

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## [Sprays simulation](https://discourse.vtk.org/t/sprays-simulation/13648)

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**Author:** [@penfe](https://discourse.vtk.org/u/penfe)\
**Replies:** 2\
**Last updated:** [March 30, 2024, 1:38am UTC](https://discourse.vtk.org/t/sprays-simulation/13648 "2024-03-30T01:38:13Z")

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Is it possible to create a topic branch about the sprays simulation for VTK::FiltersFlowPaths. The vtkLagrangianParticleTracker helped me for the inject and track particles in a flow (simulation), thanks VTK. I was gues…

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## [3D Gaussians splatting](https://discourse.vtk.org/t/3d-gaussians-splatting/12537)

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**Author:** [@meak](https://discourse.vtk.org/u/meak)\
**Replies:** 9\
**Last updated:** [March 29, 2024, 11:25am UTC](https://discourse.vtk.org/t/3d-gaussians-splatting/12537 "2024-03-29T11:25:00Z")

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If you are following rendering research, you certainly heard about 3D Gaussians splatting, a technology used to create a realistic 3D scene based on a video or multiple images and presented in Siggraph 2023. I made some…

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## [New \`quick\` stage in VTK CI](https://discourse.vtk.org/t/new-quick-stage-in-vtk-ci/13645)

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**Author:** [@Ryan\_Krattiger](https://discourse.vtk.org/u/Ryan_Krattiger)\
**Replies:** 1\
**Last updated:** [March 28, 2024, 6:52pm UTC](https://discourse.vtk.org/t/new-quick-stage-in-vtk-ci/13645 "2024-03-28T18:52:40Z")

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VTK has introduced a new stage in CI named quick. The purpose of this new stage is to allow running a quick subset of of the VTK tests to identify issues before running the full test suite. When running CI in VTK, devel…

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## [Introducing a new data comparison utility in VTK](https://discourse.vtk.org/t/introducing-a-new-data-comparison-utility-in-vtk/12549)

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**Author:** [@Yohann\_Bearzi](https://discourse.vtk.org/u/Yohann_Bearzi)\
**Replies:** 8\
**Last updated:** [March 28, 2024, 5:49pm UTC](https://discourse.vtk.org/t/introducing-a-new-data-comparison-utility-in-vtk/12549 "2024-03-28T17:49:31Z")

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We are thrilled to announce a new utility in the VTK (Visualization Toolkit) library that simplifies the task of comparing various VTK entities, including data objects, field data, and abstract arrays. This utility is pa…

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## [Widgets selection priority bug](https://discourse.vtk.org/t/widgets-selection-priority-bug/13642)

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**Author:** [@cvAIRteam](https://discourse.vtk.org/u/cvAIRteam)\
**Replies:** 0\
**Last updated:** [March 28, 2024, 8:21am UTC](https://discourse.vtk.org/t/widgets-selection-priority-bug/13642 "2024-03-28T08:21:06Z")

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Hello, When two (or more) widgets are created and one is visually behind the other, the widget selected is the first widget created. So if the widget behind is created first, it will be selected even if visually we sel…

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## [Mech labeling](https://discourse.vtk.org/t/mech-labeling/10317)

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**Author:** [@Mesh](https://discourse.vtk.org/u/Mesh)\
**Replies:** 5\
**Last updated:** [March 27, 2024, 1:44pm UTC](https://discourse.vtk.org/t/mech-labeling/10317 "2024-03-27T13:44:57Z")

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Hi All What is the best way to plot labels? Thank you

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## [Simultaneous key presses](https://discourse.vtk.org/t/simultaneous-key-presses/13637)

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**Author:** [@eyalweisz](https://discourse.vtk.org/u/eyalweisz)\
**Replies:** 1\
**Last updated:** [March 27, 2024, 10:53am UTC](https://discourse.vtk.org/t/simultaneous-key-presses/13637 "2024-03-27T10:53:22Z")

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I created a custom interactor style that handles key presses. But it seems that it handles only one key press at a time. According to chatGPT, this is how VTK works. Is there a way to enable simultaneous key presses?

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## [vtkhdf reading error for unstructured transient dataset](https://discourse.vtk.org/t/vtkhdf-reading-error-for-unstructured-transient-dataset/13352)

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**Author:** [@Borek\_Patzak](https://discourse.vtk.org/u/Borek_Patzak)\
**Replies:** 10\
**Last updated:** [March 25, 2024, 2:49pm UTC](https://discourse.vtk.org/t/vtkhdf-reading-error-for-unstructured-transient-dataset/13352 "2024-03-25T14:49:55Z")

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I am developing vtkhdf export module for FE solver. I have a problem in reading the data for the last step (in Paraview 5.12.0-RC2). I guess that Paraview uses vtkHDFReader, so I ask for help here. The dump of sample hdf…

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## [Discontinuous Galerkin elements and other novel cell-types/function-spaces](https://discourse.vtk.org/t/discontinuous-galerkin-elements-and-other-novel-cell-types-function-spaces/9209)

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**Author:** [@dcthomp](https://discourse.vtk.org/u/dcthomp)\
**Replies:** 23\
**Last updated:** [March 24, 2024, 1:42am UTC](https://discourse.vtk.org/t/discontinuous-galerkin-elements-and-other-novel-cell-types-function-spaces/9209 "2024-03-24T01:42:44Z")

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Hi all! We (@jaswantp @c.wetterer-nelson and me) have been working on a prototype to support discontinuous Galerkin (DG) finite elements (and hopefully many other novel function spaces such as mimetic techniques, X-FEM, C…

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## [LegendScaleActor SetModeToFocalPlane](https://discourse.vtk.org/t/legendscaleactor-setmodetofocalplane/13622)

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**Author:** [@omdaniel](https://discourse.vtk.org/u/omdaniel)\
**Replies:** 0\
**Last updated:** [March 22, 2024, 10:59pm UTC](https://discourse.vtk.org/t/legendscaleactor-setmodetofocalplane/13622 "2024-03-22T22:59:32Z")

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I propose an additional mode for LegendScaleActor: SetModeToFocalPlane Here I will attempt codify exactly how the axis can be clearly defined with respect to camera position, the normal for the focal plane the view up a…

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## [Section clipping rendring issue with vtk 8.2.0 version](https://discourse.vtk.org/t/section-clipping-rendring-issue-with-vtk-8-2-0-version/13621)

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**Author:** [@Mayssa](https://discourse.vtk.org/u/Mayssa)\
**Replies:** 0\
**Last updated:** [March 22, 2024, 2:15pm UTC](https://discourse.vtk.org/t/section-clipping-rendring-issue-with-vtk-8-2-0-version/13621 "2024-03-22T14:15:01Z")

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Hi all, i went to render a section clipping continous fringe plot, i did implement the following methods which didn’t lead to the desired results, even though the default plane widget is not shown. here are my functions…

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## [Render method doesn't work on Avalonia](https://discourse.vtk.org/t/render-method-doesnt-work-on-avalonia/13588)

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**Author:** [@yimadong](https://discourse.vtk.org/u/yimadong)\
**Replies:** 1\
**Last updated:** [March 22, 2024, 9:12am UTC](https://discourse.vtk.org/t/render-method-doesnt-work-on-avalonia/13588 "2024-03-22T09:12:40Z")

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Hi, I am using VTK on Avalonia, but I can’t get the render method work after the RenderWindowControl is created. I created several triangles and added texture to them. And I have a button to change the texture. But th…

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## [Question About CellLocators IntersectWithLine](https://discourse.vtk.org/t/question-about-celllocators-intersectwithline/13611)

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**Author:** [@Rafael\_Scatena](https://discourse.vtk.org/u/Rafael_Scatena)\
**Replies:** 0\
**Last updated:** [March 22, 2024, 12:05am UTC](https://discourse.vtk.org/t/question-about-celllocators-intersectwithline/13611 "2024-03-22T00:05:09Z")

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Hello, In the documentations some methods of celllocators like CellLocator IntersectWithLine (2/8) there is writen: “For each intersection with the bounds of a cell or with a cell (if a cell is provided…” Are those met…

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## [Cylinder Example rendered window doesn't show anything (Windows, Visual Studio, C++)](https://discourse.vtk.org/t/cylinder-example-rendered-window-doesnt-show-anything-windows-visual-studio-c/13593)

<div class="topic-metadata">

**Author:** [@eyalweisz](https://discourse.vtk.org/u/eyalweisz)\
**Replies:** 1\
**Last updated:** [March 21, 2024, 4:35pm UTC](https://discourse.vtk.org/t/cylinder-example-rendered-window-doesnt-show-anything-windows-visual-studio-c/13593 "2024-03-21T16:35:42Z")

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Hi friends, I’m new to VTK. Built VTK and tried the “Hello World” Cylindar Example. After configuring and generating it using CMake, I opened it in Visual Studio and set the CylinderExample project as the startup proj…

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## [Get state of widget](https://discourse.vtk.org/t/get-state-of-widget/13580)

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**Author:** [@zhangm](https://discourse.vtk.org/u/zhangm)\
**Replies:** 1\
**Last updated:** [March 21, 2024, 9:14am UTC](https://discourse.vtk.org/t/get-state-of-widget/13580 "2024-03-21T09:14:04Z")

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I create a vtkContourWidget instance, and I want to know if the mouse is hovering near the endpoint of contour. The code like this: pos = interactor.GetEventPosition() state = contourRep.ComputeInteractionState(pos\[0\], …

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## [Updates on VTK and Vulkan](https://discourse.vtk.org/t/updates-on-vtk-and-vulkan/13595)

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**Author:** [@Michael\_Jackson](https://discourse.vtk.org/u/Michael_Jackson)\
**Replies:** 1\
**Last updated:** [March 20, 2024, 6:55pm UTC](https://discourse.vtk.org/t/updates-on-vtk-and-vulkan/13595 "2024-03-20T18:55:53Z")

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Are there any updates to the VTK on Vulkan code changes? Mike Jackson

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## [VTK Legacy File Format Specification](https://discourse.vtk.org/t/vtk-legacy-file-format-specification/13591)

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**Author:** [@Michael\_Jackson](https://discourse.vtk.org/u/Michael_Jackson)\
**Replies:** 1\
**Last updated:** [March 20, 2024, 2:00pm UTC](https://discourse.vtk.org/t/vtk-legacy-file-format-specification/13591 "2024-03-20T14:00:22Z")

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Is there a link somewhere that would take me to an updated PDF file that has the complete VTK 4.2 file specification? I have an extremely old PDF that lists version 2.0. Thanks

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## [how to get a "thick" poly line from vtkPlaneCutter & vtkPolyData?](https://discourse.vtk.org/t/how-to-get-a-thick-poly-line-from-vtkplanecutter-vtkpolydata/8480)

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**Author:** [@Ingmar](https://discourse.vtk.org/u/Ingmar)\
**Replies:** 2\
**Last updated:** [March 19, 2024, 12:47pm UTC](https://discourse.vtk.org/t/how-to-get-a-thick-poly-line-from-vtkplanecutter-vtkpolydata/8480 "2024-03-19T12:47:27Z")

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I am trying to cut a mesh with a plane and render the contour on top of an image (resliced along using the same plane), much like the image below: The examples at https://gitlab.kitware.com/vtk/vtk/-/blob/v9.1.0/Filte…

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## [Wrong Input detection windows](https://discourse.vtk.org/t/wrong-input-detection-windows/13560)

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**Author:** [@AdroitBit](https://discourse.vtk.org/u/AdroitBit)\
**Replies:** 1\
**Last updated:** [March 17, 2024, 1:39pm UTC](https://discourse.vtk.org/t/wrong-input-detection-windows/13560 "2024-03-17T13:39:15Z")

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So I’m working on some project with using 3d interaction I want to give VTK Interactor a Unity’s Feel( That is hold right mouse and move to rotate camera) But seemingly all the inputs detection is on WxPython frame I …

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## [when resize window, scene&object will reszie while windowHeight resize BUT won't resize while windowWidth resize?](https://discourse.vtk.org/t/when-resize-window-scene-object-will-reszie-while-windowheight-resize-but-wont-resize-while-windowwidth-resize/13543)

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**Author:** [@gpu](https://discourse.vtk.org/u/gpu)\
**Replies:** 0\
**Last updated:** [March 15, 2024, 12:33am UTC](https://discourse.vtk.org/t/when-resize-window-scene-object-will-reszie-while-windowheight-resize-but-wont-resize-while-windowwidth-resize/13543 "2024-03-15T00:33:22Z")

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when resize window, scene&object will reszie while windowHeight resize BUT won’t resize while windowWidth resize? VTK design to do like this? why?and where is the code did this? thanks!

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## [Fatal error while using vtkCGALBooleanOperation](https://discourse.vtk.org/t/fatal-error-while-using-vtkcgalbooleanoperation/13531)

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**Author:** [@Armin](https://discourse.vtk.org/u/Armin)\
**Replies:** 2\
**Last updated:** [March 14, 2024, 3:17pm UTC](https://discourse.vtk.org/t/fatal-error-while-using-vtkcgalbooleanoperation/13531 "2024-03-14T15:17:24Z")

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Any clues on how to implement the vtkCGALBooleanOperation ? I have followed the usual procedure similar to vtkBooleanOperationPolyDataFilter but there are too many issues stemming from the vtkCGALBooleanOperation.h . I …

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## [Changing Font Size on vtkCaptionAnnotationWidget](https://discourse.vtk.org/t/changing-font-size-on-vtkcaptionannotationwidget/13539)

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**Author:** [@Jessica\_Marquis](https://discourse.vtk.org/u/Jessica_Marquis)\
**Replies:** 0\
**Last updated:** [March 14, 2024, 1:07pm UTC](https://discourse.vtk.org/t/changing-font-size-on-vtkcaptionannotationwidget/13539 "2024-03-14T13:07:06Z")

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So I am trying to implement a caption widget and one of the properties for the caption that I would like to allow the user to change is the font size. I am currently doing this by going through the vtkCaptionRepresentati…

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## [glTF texture export error](https://discourse.vtk.org/t/gltf-texture-export-error/5300)

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**Author:** [@mostapha](https://discourse.vtk.org/u/mostapha)\
**Replies:** 7\
**Last updated:** [March 13, 2024, 11:06am UTC](https://discourse.vtk.org/t/gltf-texture-export-error/5300 "2024-03-13T11:06:54Z")

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I have a .vtu file with scalardata that renders fine in VTK viewers but the texture doesn’t export correctly to glTF format. I tested it with web viewers as well as F3D to ensure it’s not the viewer. It might be helpful …

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## [MPR:how to map the point of 3D view to the point of axial view?](https://discourse.vtk.org/t/mpr-how-to-map-the-point-of-3d-view-to-the-point-of-axial-view/13511)

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**Author:** [@zhou](https://discourse.vtk.org/u/zhou)\
**Replies:** 0\
**Last updated:** [March 12, 2024, 6:49am UTC](https://discourse.vtk.org/t/mpr-how-to-map-the-point-of-3d-view-to-the-point-of-axial-view/13511 "2024-03-12T06:49:47Z")

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hello,everyone. I have achieved the MPR.Now I do not know how to map the point of 3D view to the point of axial view.I am looking forward to your reply!

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## [vtkWASM](https://discourse.vtk.org/t/vtkwasm/13505)

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**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 4\
**Last updated:** [March 11, 2024, 3:20pm UTC](https://discourse.vtk.org/t/vtkwasm/13505 "2024-03-11T15:20:55Z")

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I am trying to compile vtk-WASM on Windows. The description here Building using emscripten for WebAssembly - VTK documentation is for sure not working fully on Windows. I get errors like C:/VTK/VTK-9.3.0/Rendering/WebGP…

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## [Use gradientbackground and use vtkWindowToImageFilter's SetScale() ,picture background error!](https://discourse.vtk.org/t/use-gradientbackground-and-use-vtkwindowtoimagefilters-setscale-picture-background-error/13506)

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**Author:** [@501586528](https://discourse.vtk.org/u/501586528)\
**Replies:** 0\
**Last updated:** [March 11, 2024, 2:39pm UTC](https://discourse.vtk.org/t/use-gradientbackground-and-use-vtkwindowtoimagefilters-setscale-picture-background-error/13506 "2024-03-11T14:39:08Z")

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I want to print screen with high resolution, so I use vtkWindowToImageFilter and vtkPngWriter to save screen shot.Because I want to get high resolution screen, so i use vtkWindowToImageFilter’s SetScale() method, It work…

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## [Creating a finite vtkcylinder and using it extractpolydata](https://discourse.vtk.org/t/creating-a-finite-vtkcylinder-and-using-it-extractpolydata/13465)

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**Author:** [@Rafael\_Scatena](https://discourse.vtk.org/u/Rafael_Scatena)\
**Replies:** 1\
**Last updated:** [March 6, 2024, 9:03pm UTC](https://discourse.vtk.org/t/creating-a-finite-vtkcylinder-and-using-it-extractpolydata/13465 "2024-03-06T21:03:11Z")

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Hello, I am trying to generate a finete vtkcylinder subtracting 2 planes from a traditional vtkcylinder. The I would like to use this finite to extract cells from a larger polydata. But I don’t get any cells returned… T…

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## [vtk module dependency in Testing/Rendering](https://discourse.vtk.org/t/vtk-module-dependency-in-testing-rendering/13446)

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**Author:** [@pkestene](https://discourse.vtk.org/u/pkestene)\
**Replies:** 1\
**Last updated:** [March 5, 2024, 4:42pm UTC](https://discourse.vtk.org/t/vtk-module-dependency-in-testing-rendering/13446 "2024-03-05T16:42:52Z")

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I may be wrong as I’m not familiar with vtk build system, but I think Testing/Rendering/vtk.moduleshould list VTK::ParallelMPI in section OPTIONAL\_DEPENDS since symbol VTK\_MODULE\_ENABLE\_VTK\_ParallelMPI is used in Testin…

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## [LeftButtonPressEvent to vtkButtonWidget](https://discourse.vtk.org/t/leftbuttonpressevent-to-vtkbuttonwidget/4607)

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**Author:** [@learn\_forever](https://discourse.vtk.org/u/learn_forever)\
**Replies:** 1\
**Last updated:** [March 4, 2024, 9:27am UTC](https://discourse.vtk.org/t/leftbuttonpressevent-to-vtkbuttonwidget/4607 "2024-03-04T09:27:16Z")

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Hi Experts, I added a left-button press event handler for the button widget, code like below. vtkButtonWidget buttonWidget = vtkButtonWidget.New(); buttonWidget.SetInteractor(this.GetInteractor()); buttonWidget.SetRe…

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## [vtkOpenVDBRead Function](https://discourse.vtk.org/t/vtkopenvdbread-function/13313)

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**Author:** [@enderby\_matherror](https://discourse.vtk.org/u/enderby_matherror)\
**Replies:** 10\
**Last updated:** [March 4, 2024, 8:48am UTC](https://discourse.vtk.org/t/vtkopenvdbread-function/13313 "2024-03-04T08:48:53Z")

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I’m trying to read an openVDB file and display the volume using the function above. When I print the outputblock, the size of the volume and other data are read correctly, but all the voxel values are read as 0. https:/…

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