# Development

**URL:** https://discourse.vtk.org/c/development/7.md?page=21

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

**Page:** 22

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## [qvtk rendering](https://discourse.vtk.org/t/qvtk-rendering/11432)

<div class="topic-metadata">

**Author:** [@ubed20](https://discourse.vtk.org/u/ubed20)\
**Replies:** 0\
**Last updated:** [May 11, 2023, 9:14am UTC](https://discourse.vtk.org/t/qvtk-rendering/11432 "2023-05-11T09:14:54Z")

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i am rendering change detection using point clouds data using vtk actors in QT GUI but i cannot interact with the window i can just load the data for change detection. i cannot zoom or rotate the point clouds and render …

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## [Make nanoflann a third party used for point locators](https://discourse.vtk.org/t/make-nanoflann-a-third-party-used-for-point-locators/4300)

<div class="topic-metadata">

**Author:** [@Yohann\_Bearzi](https://discourse.vtk.org/u/Yohann_Bearzi)\
**Replies:** 20\
**Last updated:** [May 11, 2023, 12:42pm UTC](https://discourse.vtk.org/t/make-nanoflann-a-third-party-used-for-point-locators/4300 "2023-05-11T12:42:20Z")

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nanoflann, forked from flann (Fast Library for Approximate Nearest Neighbors), is a very powerful and fast point search library that I’ve been using for years on point clouds. There are a lot of different indexing scheme…

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## [\[bug\] Python-vtk BalloonWidget example does not work with vtk 9.2.2](https://discourse.vtk.org/t/bug-python-vtk-balloonwidget-example-does-not-work-with-vtk-9-2-2/10103)

<div class="topic-metadata">

**Author:** [@Matthieu](https://discourse.vtk.org/u/Matthieu)\
**Replies:** 7\
**Last updated:** [May 11, 2023, 12:38pm UTC](https://discourse.vtk.org/t/bug-python-vtk-balloonwidget-example-does-not-work-with-vtk-9-2-2/10103 "2023-05-11T12:38:53Z")

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Hello, when I try to run the BalloonWidget example I’ve got a SIGSEV error (it disappears if I comment the EnabledOn() line… but then it is not a very useful example !) Other examples work well and I have installed vtk …

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## [How to force widget manager to use a particular renderer?](https://discourse.vtk.org/t/how-to-force-widget-manager-to-use-a-particular-renderer/11410)

<div class="topic-metadata">

**Author:** [@Sneha-pk](https://discourse.vtk.org/u/Sneha-pk)\
**Replies:** 3\
**Last updated:** [May 10, 2023, 10:01pm UTC](https://discourse.vtk.org/t/how-to-force-widget-manager-to-use-a-particular-renderer/11410 "2023-05-10T22:01:04Z")

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Hello , I am trying to add axes actor to my vtk.js viewer component. I am then trying to use the axesActor to rotate the scene in y axis by 180 degree. I have created an instance of orientation widget and added the axe…

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## [Cause CMake to find different VTK?](https://discourse.vtk.org/t/cause-cmake-to-find-different-vtk/11428)

<div class="topic-metadata">

**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 2\
**Last updated:** [May 10, 2023, 3:47pm UTC](https://discourse.vtk.org/t/cause-cmake-to-find-different-vtk/11428 "2023-05-10T15:47:27Z")

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I have the standard VTK libraries installed (mostly for use in Python), but I would like to try to build a C++ project, and use a different set of libraries in ~/opt/vtk. How would I give CMake a hint to look there first…

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## [Rotate VtkImatgePlanWidget With vtkLineWidget](https://discourse.vtk.org/t/rotate-vtkimatgeplanwidget-with-vtklinewidget/11404)

<div class="topic-metadata">

**Author:** [@m.h.shanazary](https://discourse.vtk.org/u/m.h.shanazary)\
**Replies:** 4\
**Last updated:** [May 10, 2023, 9:06am UTC](https://discourse.vtk.org/t/rotate-vtkimatgeplanwidget-with-vtklinewidget/11404 "2023-05-10T09:06:56Z")

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Hi I Trying To Rotate VtkImagePlanWidget With VtkLineWidget I Create VtkImage Plan Widget And Vtk Line Widget And Set Event On Vtk Line Widget vtkPlaneSource ps = vtkPlaneSource.SafeDownCast(planeWidget.GetPolyDataA…

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## [vtkSMPThreadLocal - potential issue.](https://discourse.vtk.org/t/vtksmpthreadlocal-potential-issue/11390)

<div class="topic-metadata">

**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 0\
**Last updated:** [May 5, 2023, 10:05pm UTC](https://discourse.vtk.org/t/vtksmpthreadlocal-potential-issue/11390 "2023-05-05T22:05:59Z")

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Hi Developers I have used numerous times in the past, but something really weird is going on. I am beginning to think that it is the C++ that comes with VS2022. I am basically just finding the min and max of a set of p…

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## [How can make vtkpolydata by points?](https://discourse.vtk.org/t/how-can-make-vtkpolydata-by-points/11072)

<div class="topic-metadata">

**Author:** [@A.M\_Shahpouri](https://discourse.vtk.org/u/A.M_Shahpouri)\
**Replies:** 6\
**Last updated:** [May 9, 2023, 7:26am UTC](https://discourse.vtk.org/t/how-can-make-vtkpolydata-by-points/11072 "2023-05-09T07:26:07Z")

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Hi I have a 3DList of point data . now I want to make a heterogeneous polydata wich inside of that has filled Can you help me to way of do that?

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## [Create Depth-Map for vtkDepthImageToPointCloud](https://discourse.vtk.org/t/create-depth-map-for-vtkdepthimagetopointcloud/11380)

<div class="topic-metadata">

**Author:** [@Alejandro\_Rugero](https://discourse.vtk.org/u/Alejandro_Rugero)\
**Replies:** 8\
**Last updated:** [May 7, 2023, 8:58pm UTC](https://discourse.vtk.org/t/create-depth-map-for-vtkdepthimagetopointcloud/11380 "2023-05-07T20:58:14Z")

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Hi, good morning, I’m trying to make a Depth-Map for Create Depth-Map for vtkDepthImageToPointCloud, for 3d reconstruction of jpeg or png images, but I can’t get the Depth-Map image to work as it should, I don’t know if …

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## [How to do axis rotation of AxesActor and adding label](https://discourse.vtk.org/t/how-to-do-axis-rotation-of-axesactor-and-adding-label/11323)

<div class="topic-metadata">

**Author:** [@Sneha-pk](https://discourse.vtk.org/u/Sneha-pk)\
**Replies:** 5\
**Last updated:** [May 6, 2023, 5:34pm UTC](https://discourse.vtk.org/t/how-to-do-axis-rotation-of-axesactor-and-adding-label/11323 "2023-05-06T17:34:50Z")

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Hello, I am using axesActor to represent the axis of my viewer as shown in the image.Is there a label function in vtk.js (i know it is there in C++ and cubeaxesactor) to set labels for axis. Also,while rotating the axi…

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## [CI on Github with Windows](https://discourse.vtk.org/t/ci-on-github-with-windows/11368)

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**Author:** [@Ron84](https://discourse.vtk.org/u/Ron84)\
**Replies:** 3\
**Last updated:** [May 4, 2023, 7:41am UTC](https://discourse.vtk.org/t/ci-on-github-with-windows/11368 "2023-05-04T07:41:19Z")

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Is there a compiled version of VTK, that I can use for CI on Windows? Especially for a C++ project, based on VTK.

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## [Adding a couple Information keys to enable temporal filters to be run in situ](https://discourse.vtk.org/t/adding-a-couple-information-keys-to-enable-temporal-filters-to-be-run-in-situ/11356)

<div class="topic-metadata">

**Author:** [@Yohann\_Bearzi](https://discourse.vtk.org/u/Yohann_Bearzi)\
**Replies:** 6\
**Last updated:** [May 3, 2023, 11:06pm UTC](https://discourse.vtk.org/t/adding-a-couple-information-keys-to-enable-temporal-filters-to-be-run-in-situ/11356 "2023-05-03T23:06:53Z")

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There are problems currently when running some temporal filters in situ. Since the entire time series is not available up straight, temporal filters need to be able to produce a correct output up to the available timeste…

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## [Line and ConvexHull2D Intersection](https://discourse.vtk.org/t/line-and-convexhull2d-intersection/11336)

<div class="topic-metadata">

**Author:** [@kruvva](https://discourse.vtk.org/u/kruvva)\
**Replies:** 3\
**Last updated:** [May 3, 2023, 1:18pm UTC](https://discourse.vtk.org/t/line-and-convexhull2d-intersection/11336 "2023-05-03T13:18:40Z")

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Hi, I am trying to find out the intersection of a ConvexHull2D and a line using vtkPolyData and vtkLineSource objects with the help of vtkIntersectionPolyDataFilter as shown below: intFilter = vtk.vtkIntersectionPolyDat…

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## [Pedigree ID for a new displacement filter](https://discourse.vtk.org/t/pedigree-id-for-a-new-displacement-filter/11355)

<div class="topic-metadata">

**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 0\
**Last updated:** [May 2, 2023, 2:06pm UTC](https://discourse.vtk.org/t/pedigree-id-for-a-new-displacement-filter/11355 "2023-05-02T14:06:14Z")

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Hi Guys I am working on a few potential new filters. I already speeded up the vtkDistancePolyDataFilter a bit, but would like to have a vtkDisplacementFilter, which also provides “Direction” in addition to “Distance” Po…

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## [Transient vtkHDFReader off by a step](https://discourse.vtk.org/t/transient-vtkhdfreader-off-by-a-step/11332)

<div class="topic-metadata">

**Author:** [@logantm2](https://discourse.vtk.org/u/logantm2)\
**Replies:** 5\
**Last updated:** [May 2, 2023, 10:57am UTC](https://discourse.vtk.org/t/transient-vtkhdfreader-off-by-a-step/11332 "2023-05-02T10:57:37Z")

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It looks like the vtkHDFReader displays data off by one time step; that is, it’s showing data for step 1 as step 0, data for step 2 as 1, and so on. The last time step is a repeat of the second-to-last time step. This i…

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## [Guide: How do I use VTK-wasm webgpu experimental feature](https://discourse.vtk.org/t/guide-how-do-i-use-vtk-wasm-webgpu-experimental-feature/11164)

<div class="topic-metadata">

**Author:** [@jaswantp](https://discourse.vtk.org/u/jaswantp)\
**Replies:** 1\
**Last updated:** [May 1, 2023, 2:00pm UTC](https://discourse.vtk.org/t/guide-how-do-i-use-vtk-wasm-webgpu-experimental-feature/11164 "2023-05-01T14:00:26Z")

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As some people are already aware, there’s ongoing developments to leverage WebGPU in VTK-C++ desktop applications with Dawn - Google’s native implementation of WebGPU spec on top of Vulkan, OpenGL, OpenGLES, Metal, D3D11…

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## [Has anyone hooked up VTK to something like Apache Arrow](https://discourse.vtk.org/t/has-anyone-hooked-up-vtk-to-something-like-apache-arrow/11317)

<div class="topic-metadata">

**Author:** [@Michael\_Jackson](https://discourse.vtk.org/u/Michael_Jackson)\
**Replies:** 1\
**Last updated:** [April 26, 2023, 9:57pm UTC](https://discourse.vtk.org/t/has-anyone-hooked-up-vtk-to-something-like-apache-arrow/11317 "2023-04-26T21:57:43Z")

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Has anyone tried combining VTK with Apache Arrow for large scale, out-of-core visualization? We are expecting the data sizes that we currently process to become much larger than the memory on our workstations and the Apa…

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## [CI failures in testing Linux wheels](https://discourse.vtk.org/t/ci-failures-in-testing-linux-wheels/11286)

<div class="topic-metadata">

**Author:** [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)\
**Replies:** 1\
**Last updated:** [April 24, 2023, 7:30pm UTC](https://discourse.vtk.org/t/ci-failures-in-testing-linux-wheels/11286 "2023-04-24T19:30:19Z")

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Linux wheel testing is currently broken due to a new manylinux2014 container. Rather than trying to pin it for the few days it’s likely to remain broken for, just be aware that Linux wheel test job failures are (probably…

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## [System.AccessViolationException](https://discourse.vtk.org/t/system-accessviolationexception/11059)

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**Author:** [@Micromegas](https://discourse.vtk.org/u/Micromegas)\
**Replies:** 8\
**Last updated:** [April 24, 2023, 8:20am UTC](https://discourse.vtk.org/t/system-accessviolationexception/11059 "2023-04-24T08:20:03Z")

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Hallo @ll, we are using VTK (Version: 9.0.1.1009) as Graphic API and have problems with a System.AccessViolationException : Attempt to read or write protected memory, which keeps occurring randomly, sometimes after 30 m…

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## [vtk map scala to target color, but vtkLookupTable works not ok.](https://discourse.vtk.org/t/vtk-map-scala-to-target-color-but-vtklookuptable-works-not-ok/11225)

<div class="topic-metadata">

**Author:** [@LightSun](https://discourse.vtk.org/u/LightSun)\
**Replies:** 1\
**Last updated:** [April 24, 2023, 3:41am UTC](https://discourse.vtk.org/t/vtk-map-scala-to-target-color-but-vtklookuptable-works-not-ok/11225 "2023-04-24T03:41:46Z")

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Hello , I am new to VTK. I have a problem with display 3d image data. the color display is not my want. I have a nifti image data with only four scala values: 0 ,1, 2, 3. And I want 0 map to black, and 1 map to red, …

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## [Qt5 future in VTK](https://discourse.vtk.org/t/qt5-future-in-vtk/10218)

<div class="topic-metadata">

**Author:** [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)\
**Replies:** 12\
**Last updated:** [April 24, 2023, 3:40am UTC](https://discourse.vtk.org/t/qt5-future-in-vtk/10218 "2023-04-24T03:40:30Z")

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So 5.15 is EOL in May 2023 (without a paid subscription). It’s probably time to start thinking about what this means for VTK (and ParaView for that matter). VTK has had Qt6 as an option for a while, but CI hasn’t been d…

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## [Robot feature request for merges](https://discourse.vtk.org/t/robot-feature-request-for-merges/10656)

<div class="topic-metadata">

**Author:** [@dgobbi](https://discourse.vtk.org/u/dgobbi)\
**Replies:** 4\
**Last updated:** [April 24, 2023, 2:53am UTC](https://discourse.vtk.org/t/robot-feature-request-for-merges/10656 "2023-04-24T02:53:59Z")

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This is for devs and contributors. As we all know, the MR robot is not only noisy, but also doesn’t always give the best advice. And usually we cut it some slack because it’s just a robot and is therefore blameless for…

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## [how to set the camera to a fixed focus camera](https://discourse.vtk.org/t/how-to-set-the-camera-to-a-fixed-focus-camera/11168)

<div class="topic-metadata">

**Author:** [@xu\_siang](https://discourse.vtk.org/u/xu_siang)\
**Replies:** 3\
**Last updated:** [April 22, 2023, 7:43am UTC](https://discourse.vtk.org/t/how-to-set-the-camera-to-a-fixed-focus-camera/11168 "2023-04-22T07:43:59Z")

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Hi everyone, I want to know is there any function in vtk that can set the camera to a fixed focus camera? I want the focal length to be a fixed constant which won’t change when I move my camera. I use python vtk 8.2.0. …

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## [Issue with opacity and enabling/disabling visibility of glyphs](https://discourse.vtk.org/t/issue-with-opacity-and-enabling-disabling-visibility-of-glyphs/11258)

<div class="topic-metadata">

**Author:** [@chrisiou](https://discourse.vtk.org/u/chrisiou)\
**Replies:** 0\
**Last updated:** [April 19, 2023, 3:42pm UTC](https://discourse.vtk.org/t/issue-with-opacity-and-enabling-disabling-visibility-of-glyphs/11258 "2023-04-19T15:42:26Z")

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Hello everyone! I am using vtkTensorGlyph for visualizing hundreds of thousands of voxeloid cells and vtkLookUpTable to change the color and the opacity of each glyph. I need to be able of enabling/disabling the visibil…

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## [How to support CPU based integrated graphics card?](https://discourse.vtk.org/t/how-to-support-cpu-based-integrated-graphics-card/11236)

<div class="topic-metadata">

**Author:** [@Ren](https://discourse.vtk.org/u/Ren)\
**Replies:** 3\
**Last updated:** [April 18, 2023, 8:01am UTC](https://discourse.vtk.org/t/how-to-support-cpu-based-integrated-graphics-card/11236 "2023-04-18T08:01:34Z")

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Hi, guys, How to support CPU based integrated graphics card with VTK?

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## [Compiling without CMake](https://discourse.vtk.org/t/compiling-without-cmake/11044)

<div class="topic-metadata">

**Author:** [@mantielero](https://discourse.vtk.org/u/mantielero)\
**Replies:** 2\
**Last updated:** [April 14, 2023, 2:10pm UTC](https://discourse.vtk.org/t/compiling-without-cmake/11044 "2023-04-14T14:10:05Z")

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I am new to vtk. I’d like to explore the possibility about creating some bindings for VTK. As a first step, I need to know how to compile a basic example but without using CMake. Up to know, I tried: Just by exploring…

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## [Unexpected gap between volume images](https://discourse.vtk.org/t/unexpected-gap-between-volume-images/11205)

<div class="topic-metadata">

**Author:** [@count](https://discourse.vtk.org/u/count)\
**Replies:** 0\
**Last updated:** [April 13, 2023, 12:05pm UTC](https://discourse.vtk.org/t/unexpected-gap-between-volume-images/11205 "2023-04-13T12:05:34Z")

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Hello, I’m using VTK to render multiple volumes which are sub-blocks of a huge 3D image, but I encounter some kind of alignment issue. As demonstrated in the screenshot below, there are two cubic volumes side-by-side wi…

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## [how to pick vtkCaptionActor2D?](https://discourse.vtk.org/t/how-to-pick-vtkcaptionactor2d/11186)

<div class="topic-metadata">

**Author:** [@more\_never](https://discourse.vtk.org/u/more_never)\
**Replies:** 0\
**Last updated:** [April 12, 2023, 11:31am UTC](https://discourse.vtk.org/t/how-to-pick-vtkcaptionactor2d/11186 "2023-04-12T11:31:55Z")

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hi, everyone. I am using vtkCaptionActor2D to create a caption label, i have already opened the pickable by PickableOn. But how to pick this vtkActor2D, like using button click it and can capture it in one function? Than…

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## [2d Grid lines large scale](https://discourse.vtk.org/t/2d-grid-lines-large-scale/11176)

<div class="topic-metadata">

**Author:** [@linicson](https://discourse.vtk.org/u/linicson)\
**Replies:** 0\
**Last updated:** [April 10, 2023, 2:09pm UTC](https://discourse.vtk.org/t/2d-grid-lines-large-scale/11176 "2023-04-10T14:09:44Z")

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is that possible to create grid view with lines similar like google map, when zoom in get more lines

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## [vtkContourTriangulator (Triangulation failed)](https://discourse.vtk.org/t/vtkcontourtriangulator-triangulation-failed/11127)

<div class="topic-metadata">

**Author:** [@marcomusy](https://discourse.vtk.org/u/marcomusy)\
**Replies:** 6\
**Last updated:** [April 6, 2023, 12:54pm UTC](https://discourse.vtk.org/t/vtkcontourtriangulator-triangulation-failed/11127 "2023-04-06T12:54:39Z")

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I found an example where the filter seems to fail (but not clear to me why) - I wonder if there is a fix…: from vedo import \* pts = np.array(\[ \[1.96, 2.48, -1.34\], \[1.89, 2.34, -1.33\], \[1.74, 2.41, -1.35\], …

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