# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=18

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

**Page:** 19

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## [How can I maintain the size of dots in a texture image when applying a texture map](https://discourse.vtk.org/t/how-can-i-maintain-the-size-of-dots-in-a-texture-image-when-applying-a-texture-map/14689)

<div class="topic-metadata">

**Author:** [@jl\_h](https://discourse.vtk.org/u/jl_h)\
**Replies:** 1\
**Last updated:** [October 16, 2024, 7:13pm UTC](https://discourse.vtk.org/t/how-can-i-maintain-the-size-of-dots-in-a-texture-image-when-applying-a-texture-map/14689 "2024-10-16T19:13:08Z")

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Hello everyone. I’m encountering an issue with vtkTextureMapToPlane. When I map the texture image onto my STL model, some of the dots in the texture get resized. Since the next step is to obtain the corresponding color …

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## [Vtk 9.3.1 compilation issue with Visual Studio 2022](https://discourse.vtk.org/t/vtk-9-3-1-compilation-issue-with-visual-studio-2022/14698)

<div class="topic-metadata">

**Author:** [@vishalkumar2222](https://discourse.vtk.org/u/vishalkumar2222)\
**Replies:** 5\
**Last updated:** [October 16, 2024, 11:53am UTC](https://discourse.vtk.org/t/vtk-9-3-1-compilation-issue-with-visual-studio-2022/14698 "2024-10-16T11:53:58Z")

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I’m trying to compile VTK9.3.1 along with Qt 6.7.3 using Visual Studio 2022. I’m getting this error “vtkDepthPeelingPassIntermediateFS.h(6,1): error C1070: mismatched #if/#endif pair in file” Is there any solution of th…

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## [How can i implement an interactive coordinate axis to move/rotate my actor](https://discourse.vtk.org/t/how-can-i-implement-an-interactive-coordinate-axis-to-move-rotate-my-actor/13080)

<div class="topic-metadata">

**Author:** [@musheng0624](https://discourse.vtk.org/u/musheng0624)\
**Replies:** 2\
**Last updated:** [October 15, 2024, 1:29am UTC](https://discourse.vtk.org/t/how-can-i-implement-an-interactive-coordinate-axis-to-move-rotate-my-actor/13080 "2024-10-15T01:29:52Z")

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I am new to VTK. Now my project is going to render two actor. And I want to implement an interactive coordinate axis to move or rotate one of my actor, but i have no idea how to start my project. Is there any code samp…

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## [vtkCylinderSource() transformation](https://discourse.vtk.org/t/vtkcylindersource-transformation/14699)

<div class="topic-metadata">

**Author:** [@Mordrago](https://discourse.vtk.org/u/Mordrago)\
**Replies:** 3\
**Last updated:** [October 11, 2024, 3:40pm UTC](https://discourse.vtk.org/t/vtkcylindersource-transformation/14699 "2024-10-11T15:40:12Z")

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Hello! Using the pyransac3d algorithm, I calculate the cylinder parameters and then try to create an actor from them. I know that the parameters such as the normal determine well, as for example the height of the cylind…

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## [Writing multiple time in the same file with vtkXMLPolyDataWriter](https://discourse.vtk.org/t/writing-multiple-time-in-the-same-file-with-vtkxmlpolydatawriter/14697)

<div class="topic-metadata">

**Author:** [@Paul-Swann\_Puel](https://discourse.vtk.org/u/Paul-Swann_Puel)\
**Replies:** 1\
**Last updated:** [October 10, 2024, 2:21pm UTC](https://discourse.vtk.org/t/writing-multiple-time-in-the-same-file-with-vtkxmlpolydatawriter/14697 "2024-10-10T14:21:21Z")

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Hi ! I have a code that write its data in a new .vtp file each time in order to be recognize as a sequence of time steps. Those data are PolyData wrote with XML. Is-it easily possible to change that to wrote multiple t…

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## [encounter error when compiled vtk9.4](https://discourse.vtk.org/t/encounter-error-when-compiled-vtk9-4/14694)

<div class="topic-metadata">

**Author:** [@longjiang321](https://discourse.vtk.org/u/longjiang321)\
**Replies:** 1\
**Last updated:** [October 10, 2024, 1:47pm UTC](https://discourse.vtk.org/t/encounter-error-when-compiled-vtk9-4/14694 "2024-10-10T13:47:38Z")

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hi friends: I had encounter some error when compile VTK9.4 with Visual Studio 2022, any friend can give some advice!!! thank you in advance !!!

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## [How to get Hounsfield units from raw pixel data for CT?](https://discourse.vtk.org/t/how-to-get-hounsfield-units-from-raw-pixel-data-for-ct/14651)

<div class="topic-metadata">

**Author:** [@Grigoriy\_Postolskiy](https://discourse.vtk.org/u/Grigoriy_Postolskiy)\
**Replies:** 2\
**Last updated:** [October 9, 2024, 3:38am UTC](https://discourse.vtk.org/t/how-to-get-hounsfield-units-from-raw-pixel-data-for-ct/14651 "2024-10-09T03:38:35Z")

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Hello! When I read the value of individual pixels of CT or MRI, I get values ​​in the range from 0 to 65535. How can I get values ​​in Hounsfield units, that is, in the range from -1024 to ~2000? For example: contrast…

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## [Create multiple render windows and got "failed at glDeleteFramebuffers 16 OpenGL errors detected" error when closing application](https://discourse.vtk.org/t/create-multiple-render-windows-and-got-failed-at-gldeleteframebuffers-16-opengl-errors-detected-error-when-closing-application/14682)

<div class="topic-metadata">

**Author:** [@cyfgod](https://discourse.vtk.org/u/cyfgod)\
**Replies:** 1\
**Last updated:** [October 9, 2024, 2:45pm UTC](https://discourse.vtk.org/t/create-multiple-render-windows-and-got-failed-at-gldeleteframebuffers-16-opengl-errors-detected-error-when-closing-application/14682 "2024-10-09T14:45:34Z")

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Hello everyone, In our scenario, we use StackLayout to switch different user’s DICOM render image in QML. For example: StackLayout { id: multi\_viewer Layout.preferredWidth: 800 Layout.preferredHeight: 768 …

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## [Issues I encountered while compiling with the vtk-wasm-sdk Docker.](https://discourse.vtk.org/t/issues-i-encountered-while-compiling-with-the-vtk-wasm-sdk-docker/14322)

<div class="topic-metadata">

**Author:** [@Behtgod](https://discourse.vtk.org/u/Behtgod)\
**Replies:** 7\
**Last updated:** [October 8, 2024, 1:29pm UTC](https://discourse.vtk.org/t/issues-i-encountered-while-compiling-with-the-vtk-wasm-sdk-docker/14322 "2024-10-08T13:29:04Z")

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When I used the Docker image of kitware/vtk-wasm-sdk, I encountered various problems. I followed the Usage on DockerHub, downloaded the examples, and then proceeded to compile them. I am using the Windows platform, and…

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## [Problem with vtkGPUVolumeRayCastMapper](https://discourse.vtk.org/t/problem-with-vtkgpuvolumeraycastmapper/13715)

<div class="topic-metadata">

**Author:** [@russm66](https://discourse.vtk.org/u/russm66)\
**Replies:** 4\
**Last updated:** [October 8, 2024, 10:52pm UTC](https://discourse.vtk.org/t/problem-with-vtkgpuvolumeraycastmapper/13715 "2024-10-08T22:52:55Z")

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I’m trying to volume render some data that represents the state variables of a fluid defined on the uniform Cartesian grid of a 3D fluid simulation. I’m using VTK Version: 9.3.20240324, and running into trouble with the …

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## [Bug with Cpp Standard 20](https://discourse.vtk.org/t/bug-with-cpp-standard-20/14679)

<div class="topic-metadata">

**Author:** [@Msd](https://discourse.vtk.org/u/Msd)\
**Replies:** 1\
**Last updated:** [October 8, 2024, 12:41pm UTC](https://discourse.vtk.org/t/bug-with-cpp-standard-20/14679 "2024-10-08T12:41:54Z")

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I am trying to build VTK with CPP standard 20 and getting the following errors: vtkSMPToolsImpl.cxx.obj : error LNK2005: “public: \_\_cdecl vtk::detail::smp::vtkSMPToolsImpl\<2\>::vtkSMPToolsImpl\<2\>(void)” (??0?$vtkSMPTools…

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## [How to use VTK in Android Studio/and some questions](https://discourse.vtk.org/t/how-to-use-vtk-in-android-studio-and-some-questions/14668)

<div class="topic-metadata">

**Author:** [@Roque](https://discourse.vtk.org/u/Roque)\
**Replies:** 6\
**Last updated:** [October 7, 2024, 6:55pm UTC](https://discourse.vtk.org/t/how-to-use-vtk-in-android-studio-and-some-questions/14668 "2024-10-07T18:55:53Z")

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Hello everyone, This project is implemented based on NativeVTK and vtkAndroidRenderWindowInteractor, which worked in vtk 9.3.1 (there may be a crash on the first run), but I compiled the latest code from gitlab and it c…

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## [one file to merge them all](https://discourse.vtk.org/t/one-file-to-merge-them-all/14671)

<div class="topic-metadata">

**Author:** [@Xtof](https://discourse.vtk.org/u/Xtof)\
**Replies:** 4\
**Last updated:** [October 7, 2024, 7:27am UTC](https://discourse.vtk.org/t/one-file-to-merge-them-all/14671 "2024-10-07T07:27:47Z")

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Hi there, thanks for the job. I work with features, stored as unstructured grid (+there data). Is it possible to store each feature on its own single file, and have a “main vtk file” that list them all ? that would gi…

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## [Complie 9.2.6 Debug under Windows](https://discourse.vtk.org/t/complie-9-2-6-debug-under-windows/11234)

<div class="topic-metadata">

**Author:** [@aborsic](https://discourse.vtk.org/u/aborsic)\
**Replies:** 9\
**Last updated:** [October 6, 2024, 9:50pm UTC](https://discourse.vtk.org/t/complie-9-2-6-debug-under-windows/11234 "2024-10-06T21:50:41Z")

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Hi All, I am trying to compile VTK 9.2.6 under Windows using Visual Studio 2022, CMake 3.25.2 and Python 3.11.2 for bindings. The release compile succeeds, but the debug fails with this error: I am puzzled as: 1) th…

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## [\`vtkSelection\` with multiple displayed meshes](https://discourse.vtk.org/t/vtkselection-with-multiple-displayed-meshes/14667)

<div class="topic-metadata">

**Author:** [@kerim](https://discourse.vtk.org/u/kerim)\
**Replies:** 1\
**Last updated:** [October 5, 2024, 7:08pm UTC](https://discourse.vtk.org/t/vtkselection-with-multiple-displayed-meshes/14667 "2024-10-05T19:08:58Z")

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Hi, I’m trying to get indices of selected points. The problem is that when there are multiple displayed meshes then the selection may contain several vtkSelectionNode objects. But I cant understand which selectionNode …

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## [Building VTK-9.2.5 on macOS](https://discourse.vtk.org/t/building-vtk-9-2-5-on-macos/14665)

<div class="topic-metadata">

**Author:** [@constifer](https://discourse.vtk.org/u/constifer)\
**Replies:** 2\
**Last updated:** [October 5, 2024, 2:20pm UTC](https://discourse.vtk.org/t/building-vtk-9-2-5-on-macos/14665 "2024-10-05T14:20:21Z")

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The dreaded day is finally upon me where we swap from an installation that was working to apple silicon (i’m not happy about it either, i was happy before!). It seems that 9.2.5 is the last version of VTK we can use as …

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## [Requesting pieces in a pipeline](https://discourse.vtk.org/t/requesting-pieces-in-a-pipeline/14662)

<div class="topic-metadata">

**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 2\
**Last updated:** [October 5, 2024, 5:33am UTC](https://discourse.vtk.org/t/requesting-pieces-in-a-pipeline/14662 "2024-10-05T05:33:39Z")

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I am aware of the existing vtkPieceRequestFilter, which facilitates selecting which piece to get from upstream, but if the upstream filter does not support pieces, I cannot use it. I have made a filter, which can subdiv…

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## [Storing Time-dependent PartitionedDataSetCollection](https://discourse.vtk.org/t/storing-time-dependent-partitioneddatasetcollection/14658)

<div class="topic-metadata">

**Author:** [@vb\_19192](https://discourse.vtk.org/u/vb_19192)\
**Replies:** 0\
**Last updated:** [October 4, 2024, 9:55am UTC](https://discourse.vtk.org/t/storing-time-dependent-partitioneddatasetcollection/14658 "2024-10-04T09:55:53Z")

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I am writing a data format that is made of a vtkPartitionedDataSetCollection containing multiple vtkUnstructuredGrids. This data is time dependent, such that a PartitionedDataSetCollection can be generated for each time …

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## [activiz vtkdataarray performance](https://discourse.vtk.org/t/activiz-vtkdataarray-performance/14649)

<div class="topic-metadata">

**Author:** [@mortifiedpenguin](https://discourse.vtk.org/u/mortifiedpenguin)\
**Replies:** 3\
**Last updated:** [October 4, 2024, 5:26am UTC](https://discourse.vtk.org/t/activiz-vtkdataarray-performance/14649 "2024-10-04T05:26:26Z")

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Hi, I’m using Activiz and want to save the output of a vtkImageReslice. My (experimental) code regarding the export is as follows: var data = reslice.GetOutput().GetPointData().GetScalars(); var …

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## [crop a vloume by the curve draw react-vtkjs](https://discourse.vtk.org/t/crop-a-vloume-by-the-curve-draw-react-vtkjs/14655)

<div class="topic-metadata">

**Author:** [@huyprowow](https://discourse.vtk.org/u/huyprowow)\
**Replies:** 0\
**Last updated:** [October 3, 2024, 4:30pm UTC](https://discourse.vtk.org/t/crop-a-vloume-by-the-curve-draw-react-vtkjs/14655 "2024-10-03T16:30:16Z")

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how can i crop a volume by the curve react-vtk-js

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## [Point Cloud Rendering](https://discourse.vtk.org/t/point-cloud-rendering/14405)

<div class="topic-metadata">

**Author:** [@metamurk](https://discourse.vtk.org/u/metamurk)\
**Replies:** 9\
**Last updated:** [October 3, 2024, 9:59am UTC](https://discourse.vtk.org/t/point-cloud-rendering/14405 "2024-10-03T09:59:55Z")

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Hello together, I need to render large point clouds with vtk 9.3. on a quite modern graphics device. The point cloouds have up to 15 million points. Any tips or suggestions how to achieve reasonable render performance? …

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## [\`vtkCubeAxesActor\` makes interaction is extremelly slow](https://discourse.vtk.org/t/vtkcubeaxesactor-makes-interaction-is-extremelly-slow/6480)

<div class="topic-metadata">

**Author:** [@kerim](https://discourse.vtk.org/u/kerim)\
**Replies:** 1\
**Last updated:** [October 2, 2024, 1:39pm UTC](https://discourse.vtk.org/t/vtkcubeaxesactor-makes-interaction-is-extremelly-slow/6480 "2024-10-02T13:39:18Z")

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Hi, I attach two animated gif files: first demonstrates how slow vtkCubeAxesActor interaction works; second shows how fast works cylinder example Even in gif animation you can notice that cube axes extremelly decrea…

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## [Visual Studio 2019 - executables can't find the .dll libraries - Help!](https://discourse.vtk.org/t/visual-studio-2019-executables-cant-find-the-dll-libraries-help/5700)

<div class="topic-metadata">

**Author:** [@ChrisEdge](https://discourse.vtk.org/u/ChrisEdge)\
**Replies:** 3\
**Last updated:** [October 2, 2024, 7:13am UTC](https://discourse.vtk.org/t/visual-studio-2019-executables-cant-find-the-dll-libraries-help/5700 "2024-10-02T07:13:46Z")

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On windows, building with Visual Studio 2019 everything builds OK with VTK Examples but none of the executables can find the .dll libraries it needs for VTK - Help!

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## [LNK2019	unresolved external symbol... I encountered problems when building vtk into static libs](https://discourse.vtk.org/t/lnk2019-unresolved-external-symbol-i-encountered-problems-when-building-vtk-into-static-libs/14646)

<div class="topic-metadata">

**Author:** [@Etzka](https://discourse.vtk.org/u/Etzka)\
**Replies:** 2\
**Last updated:** [October 1, 2024, 11:34pm UTC](https://discourse.vtk.org/t/lnk2019-unresolved-external-symbol-i-encountered-problems-when-building-vtk-into-static-libs/14646 "2024-10-01T23:34:46Z")

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I encountered errors! after generating VTK.sln in build tree with cmake, I compiled my build tree(built from VTK source) with VS2022, then the errors show: Error LNK2019 unresolved external symbol “public: bool \_\_cdecl…

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## [Manual Z index ordering for Point Cloud Maximum Intensity Projection](https://discourse.vtk.org/t/manual-z-index-ordering-for-point-cloud-maximum-intensity-projection/5305)

<div class="topic-metadata">

**Author:** [@ramaguirre](https://discourse.vtk.org/u/ramaguirre)\
**Replies:** 3\
**Last updated:** [October 1, 2024, 3:41pm UTC](https://discourse.vtk.org/t/manual-z-index-ordering-for-point-cloud-maximum-intensity-projection/5305 "2024-10-01T15:41:51Z")

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I’d like to replicate the Maximum Intensity Projection (‘enhance high values’) feature of Leapfrog, which brings sparse points with high scalar values to the foreground. According to Cowan (2014) this is ‘easily’ achieve…

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## [How to fix: CMake Error Found relative path while evaluating include directories of](https://discourse.vtk.org/t/how-to-fix-cmake-error-found-relative-path-while-evaluating-include-directories-of/11865)

<div class="topic-metadata">

**Author:** [@fghoussen](https://discourse.vtk.org/u/fghoussen)\
**Replies:** 9\
**Last updated:** [September 30, 2024, 9:09pm UTC](https://discourse.vtk.org/t/how-to-fix-cmake-error-found-relative-path-while-evaluating-include-directories-of/11865 "2024-09-30T21:09:34Z")

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How to fix: CMake Error Found relative path while evaluating include directories of Starting from https://examples.vtk.org/site/Cxx/PolyData/ColoredPoints/, I decided to compile VTK as a git-submodule which implies: r…

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## [How to place data on a sphere with different locations that those used drawing the sphere](https://discourse.vtk.org/t/how-to-place-data-on-a-sphere-with-different-locations-that-those-used-drawing-the-sphere/14632)

<div class="topic-metadata">

**Author:** [@bbrout](https://discourse.vtk.org/u/bbrout)\
**Replies:** 0\
**Last updated:** [September 30, 2024, 2:40am UTC](https://discourse.vtk.org/t/how-to-place-data-on-a-sphere-with-different-locations-that-those-used-drawing-the-sphere/14632 "2024-09-30T02:40:04Z")

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Hello. I am using Ubuntu 20.04 with a Beowulf Cluster with 20 processors to create animation in ParaView using C. The solution to the differential equation for the harmonic function in spherical coordinates does not conv…

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## [how to build vtk with qt6 qml support, and how to build vtk examples](https://discourse.vtk.org/t/how-to-build-vtk-with-qt6-qml-support-and-how-to-build-vtk-examples/13231)

<div class="topic-metadata">

**Author:** [@gzt036](https://discourse.vtk.org/u/gzt036)\
**Replies:** 3\
**Last updated:** [September 27, 2024, 4:26pm UTC](https://discourse.vtk.org/t/how-to-build-vtk-with-qt6-qml-support-and-how-to-build-vtk-examples/13231 "2024-09-27T16:26:15Z")

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new to vtk c++ package, please help. thanks

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## [Building VTK with Qt6](https://discourse.vtk.org/t/building-vtk-with-qt6/12534)

<div class="topic-metadata">

**Author:** [@Jan\_Vlach](https://discourse.vtk.org/u/Jan_Vlach)\
**Replies:** 3\
**Last updated:** [September 27, 2024, 4:25pm UTC](https://discourse.vtk.org/t/building-vtk-with-qt6/12534 "2024-09-27T16:25:22Z")

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Hello, i have been trying to build vtk with qt6 gui support, but when generating project, cmake allways fails. CMake err CMake Warning at CMake/vtkModule.cmake:4787 (find\_package): Could not find a configuration file fo…

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## [VTK 9.3.1 rendering problem on linux](https://discourse.vtk.org/t/vtk-9-3-1-rendering-problem-on-linux/14623)

<div class="topic-metadata">

**Author:** [@khiltchenko](https://discourse.vtk.org/u/khiltchenko)\
**Replies:** 0\
**Last updated:** [September 26, 2024, 9:59am UTC](https://discourse.vtk.org/t/vtk-9-3-1-rendering-problem-on-linux/14623 "2024-09-26T09:59:13Z")

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Hello! I’m trying to run CylinderExample on a Linux PC. I use VTK 9.3.1. VTK is builded from the sources. Building and installation of VTK went without errors. The example source code also builds without errors. Open…

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