# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=2

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

**Page:** 3

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## [Creating wxVTKRenderWindowInteractor fails on Ubuntu 24.04.1](https://discourse.vtk.org/t/creating-wxvtkrenderwindowinteractor-fails-on-ubuntu-24-04-1/16314)

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**Author:** [@jkr](https://discourse.vtk.org/u/jkr)\
**Replies:** 3\
**Last updated:** [March 5, 2026, 4:09pm UTC](https://discourse.vtk.org/t/creating-wxvtkrenderwindowinteractor-fails-on-ubuntu-24-04-1/16314 "2026-03-05T16:09:07Z")

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Hi, creating a wxVTKRenderWindowInteractor fails with NotImplementedError and SystemError: \<slot wrapper '\_\_init\_\_' of 'sip.simplewrapper' objects\> returned a result with an exception set . This happens on a second comp…

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## [Java Wrapper memory management](https://discourse.vtk.org/t/java-wrapper-memory-management/16312)

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**Author:** [@Haddy](https://discourse.vtk.org/u/Haddy)\
**Replies:** 2\
**Last updated:** [March 5, 2026, 3:06am UTC](https://discourse.vtk.org/t/java-wrapper-memory-management/16312 "2026-03-05T03:06:11Z")

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I have a question about using vtk inside Java. Is it neccessary to call Delete() on something like a vtkImageData object, or is the memory safely released when it falls out of Scope or is set to null?

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## [Dental models orientation](https://discourse.vtk.org/t/dental-models-orientation/16311)

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**Author:** [@bassfaye](https://discourse.vtk.org/u/bassfaye)\
**Replies:** 4\
**Last updated:** [March 4, 2026, 4:18pm UTC](https://discourse.vtk.org/t/dental-models-orientation/16311 "2026-03-04T16:18:05Z")

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I have two dental models (upper and lower model). They are randomly oriented (see image 1). I want to orient dental models like image 2 (Y axis to anterior teeth face a consistent direction, Z axis to occlusal). How can …

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## [First release of fVTKHDF: A modern Fortran library for writing VTKHDF files](https://discourse.vtk.org/t/first-release-of-fvtkhdf-a-modern-fortran-library-for-writing-vtkhdf-files/16304)

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**Author:** [@nncarlson](https://discourse.vtk.org/u/nncarlson)\
**Replies:** 7\
**Last updated:** [March 2, 2026, 1:35pm UTC](https://discourse.vtk.org/t/first-release-of-fvtkhdf-a-modern-fortran-library-for-writing-vtkhdf-files/16304 "2026-03-02T13:35:48Z")

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If you’re a Fortran’er, this may be of interest to you. I’ve just published the first release of fVTKHDF, a high-level, object-oriented Fortran library for writing VTKHDF files. It currently supports UnstructuredGrid (…

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## [Volume rendering invalid texture dimensions](https://discourse.vtk.org/t/volume-rendering-invalid-texture-dimensions/3917)

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**Author:** [@mykolav](https://discourse.vtk.org/u/mykolav)\
**Replies:** 10\
**Last updated:** [February 26, 2026, 5:57am UTC](https://discourse.vtk.org/t/volume-rendering-invalid-texture-dimensions/3917 "2026-02-26T05:57:41Z")

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Hi everyone, I’m using vtkSmartVolumeMapper to render volume. The resolution is about 4000 in each dimension. When I run the rendering I get ERROR: OpenGL MAX\_3D\_TEXTURE\_SIZE is 2048. Invalid texture dimensions. How doe…

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## [Vtk 9.6 and qtquick support](https://discourse.vtk.org/t/vtk-9-6-and-qtquick-support/16302)

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**Author:** [@cadons](https://discourse.vtk.org/u/cadons)\
**Replies:** 1\
**Last updated:** [February 24, 2026, 8:50am UTC](https://discourse.vtk.org/t/vtk-9-6-and-qtquick-support/16302 "2026-02-24T08:50:01Z")

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Hi everyone, I’m working on the vcpkg port for VTK 9.6. I have built the library successfully, but I noticed that this new version no longer generates the qml folder. After checking the source code, I found that it was…

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## [Set block color of a MultiBlockDataSet](https://discourse.vtk.org/t/set-block-color-of-a-multiblockdataset/16301)

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**Author:** [@BotellaA](https://discourse.vtk.org/u/BotellaA)\
**Replies:** 7\
**Last updated:** [February 24, 2026, 3:00am UTC](https://discourse.vtk.org/t/set-block-color-of-a-multiblockdataset/16301 "2026-02-24T03:00:47Z")

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I have a MultiBlockDataSet imported from a .vtm file. I am trying to set up specific colors for every block. My first attempt is to set the same color for every blocks but the color never changes. Here is my Python code…

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## [Slow Oblique Slicing and Scrolling with \>2k Slices Using vtkOpenGLImageSliceMapper](https://discourse.vtk.org/t/slow-oblique-slicing-and-scrolling-with-2k-slices-using-vtkopenglimageslicemapper/16288)

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**Author:** [@Manjunath\_AV](https://discourse.vtk.org/u/Manjunath_AV)\
**Replies:** 10\
**Last updated:** [February 21, 2026, 6:01pm UTC](https://discourse.vtk.org/t/slow-oblique-slicing-and-scrolling-with-2k-slices-using-vtkopenglimageslicemapper/16288 "2026-02-21T18:01:39Z")

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I’m using vtkOpenGLImageSliceMapper to render more than 2000 image slices. When performing oblique slice operations in 2D or scrolling through slices, the interaction becomes noticeably slow. Are there recommended ways t…

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## [vtkLabelPlacementMapper with coincident points](https://discourse.vtk.org/t/vtklabelplacementmapper-with-coincident-points/16297)

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**Author:** [@raungst](https://discourse.vtk.org/u/raungst)\
**Replies:** 2\
**Last updated:** [February 21, 2026, 5:00pm UTC](https://discourse.vtk.org/t/vtklabelplacementmapper-with-coincident-points/16297 "2026-02-21T17:00:49Z")

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Hi, I’m currently using vtkLabelPlacementMapper to label a bunch of points in my scene. My trouble is that if I label points that are coincident, vtkLabelPlacementMapper is moving the points so they don’t overlap anymor…

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## [vtkAxesActor bounding box appears to be affected by it's world position](https://discourse.vtk.org/t/vtkaxesactor-bounding-box-appears-to-be-affected-by-its-world-position/16290)

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**Author:** [@Dan\_The\_Man](https://discourse.vtk.org/u/Dan_The_Man)\
**Replies:** 4\
**Last updated:** [February 20, 2026, 4:59pm UTC](https://discourse.vtk.org/t/vtkaxesactor-bounding-box-appears-to-be-affected-by-its-world-position/16290 "2026-02-20T16:59:35Z")

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First noticed and described in this comment I have asked AI to provide a test script that can replicate the behavior I’m seeing in my larger application. Here’s the prompt I gave claude.ai for completeness: I’m lookin…

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## [Partial webGPU buffer updates on polydata modification](https://discourse.vtk.org/t/partial-webgpu-buffer-updates-on-polydata-modification/16293)

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**Author:** [@MaxKopacz](https://discourse.vtk.org/u/MaxKopacz)\
**Replies:** 0\
**Last updated:** [February 18, 2026, 1:26pm UTC](https://discourse.vtk.org/t/partial-webgpu-buffer-updates-on-polydata-modification/16293 "2026-02-18T13:26:10Z")

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I would like to efficiently move points on massive polydata arrays (\>50 million vertices/15 million cells). I can pick out the exact vertices and move them, which updates the cells in the polydata by index. Whilst the po…

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## [AMR dataset with negative spacing](https://discourse.vtk.org/t/amr-dataset-with-negative-spacing/16278)

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**Author:** [@celynchgt](https://discourse.vtk.org/u/celynchgt)\
**Replies:** 7\
**Last updated:** [February 13, 2026, 3:06pm UTC](https://discourse.vtk.org/t/amr-dataset-with-negative-spacing/16278 "2026-02-13T15:06:36Z")

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I’m trying to create a vtkOverlappingAMR dataset. All the blocks are vtkUniformGrids, but the points are ordered so that X decreases with increasing I (the first index), Y increases with increasing J, and Z decreases wi…

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## [VTK Multi Touch Support](https://discourse.vtk.org/t/vtk-multi-touch-support/16285)

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**Author:** [@Arya](https://discourse.vtk.org/u/Arya)\
**Replies:** 0\
**Last updated:** [February 11, 2026, 5:11pm UTC](https://discourse.vtk.org/t/vtk-multi-touch-support/16285 "2026-02-11T17:11:39Z")

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Hi fellow devs, I am trying to implement touch support for my existing vtk environment with the help of VTK: vtkInteractorStyleMultiTouchCamera Class Reference. I am on version 9.3 of VTK. So far all it does is rotate t…

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## [Mesh rendering worse between VTK 8.1 and 9.2.6](https://discourse.vtk.org/t/mesh-rendering-worse-between-vtk-8-1-and-9-2-6/11388)

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**Author:** [@macadata](https://discourse.vtk.org/u/macadata)\
**Replies:** 6\
**Last updated:** [February 8, 2026, 12:10pm UTC](https://discourse.vtk.org/t/mesh-rendering-worse-between-vtk-8-1-and-9-2-6/11388 "2026-02-08T12:10:31Z")

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I’m noticing that, generally, mesh renderings look worse after updating my program to VTK 9.2.6 than they looked using 8.1. It’s somewhat subtle, but the lines somehow don’t look as sharp, particularly when zoomed out. …

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## [Changing Install path CMAKE\_INSTALL\_PREFIX](https://discourse.vtk.org/t/changing-install-path-cmake-install-prefix/16270)

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**Author:** [@francek](https://discourse.vtk.org/u/francek)\
**Replies:** 2\
**Last updated:** [February 6, 2026, 10:28am UTC](https://discourse.vtk.org/t/changing-install-path-cmake-install-prefix/16270 "2026-02-06T10:28:25Z")

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Hi, I built VTK 9.4.1. I would like to change install path however. What is the fastest/correct way to do that please ? After generating new Cmake configuration, do I need to rebuild the whole VTK ? Or building ‘INS…

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## [find\_package(VTK REQUIRED) refuses to load](https://discourse.vtk.org/t/find-package-vtk-required-refuses-to-load/16271)

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**Author:** [@Richard\_Spencer](https://discourse.vtk.org/u/Richard_Spencer)\
**Replies:** 3\
**Last updated:** [February 4, 2026, 4:12pm UTC](https://discourse.vtk.org/t/find-package-vtk-required-refuses-to-load/16271 "2026-02-04T16:12:48Z")

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I am using CMake 4.4.2 in order to use Visual Studio 18 2026 supported since 4.2. I am building CompuCell3D from source. Why is it finding VTK 9.4.2 but refusing to use it? How do I work around this apparent CMake pro…

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## [Build error: VTK 9.5.2, Debug/Win32, MSVC 14.44.35207 (Visual Studio 2022 17)](https://discourse.vtk.org/t/build-error-vtk-9-5-2-debug-win32-msvc-14-44-35207-visual-studio-2022-17/16269)

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**Author:** [@francek](https://discourse.vtk.org/u/francek)\
**Replies:** 2\
**Last updated:** [February 4, 2026, 2:05pm UTC](https://discourse.vtk.org/t/build-error-vtk-9-5-2-debug-win32-msvc-14-44-35207-visual-studio-2022-17/16269 "2026-02-04T14:05:58Z")

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Hi, I tried to build VTK 9.5.2 for Win32/x86, but the build failed. The same configuration builds VTK 9.4.1 successfully. 260203\_build\_vtk9.5.2\_x86\_msvs\_output\_\_2 target failed\_1.txt (565.0 KB) Cmake settings CMAKE\_…

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## [VTKHDF and vtkGlobalPointIds](https://discourse.vtk.org/t/vtkhdf-and-vtkglobalpointids/16264)

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**Author:** [@nncarlson](https://discourse.vtk.org/u/nncarlson)\
**Replies:** 3\
**Last updated:** [February 2, 2026, 2:59pm UTC](https://discourse.vtk.org/t/vtkhdf-and-vtkglobalpointids/16264 "2026-02-02T14:59:36Z")

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I’m generating VTKHDF unstructured grid datasets in parallel consisting of multiple parts. Gemini tells me that if I include a vtkGlobalPointIds array in the PointData group, Paraview will use it to better stitch togeth…

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## [QQuickVTKItem and QML are not properly closed](https://discourse.vtk.org/t/qquickvtkitem-and-qml-are-not-properly-closed/16259)

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**Author:** [@Joaquin\_Opazo](https://discourse.vtk.org/u/Joaquin_Opazo)\
**Replies:** 0\
**Last updated:** [January 27, 2026, 1:25pm UTC](https://discourse.vtk.org/t/qquickvtkitem-and-qml-are-not-properly-closed/16259 "2026-01-27T13:25:03Z")

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Hi, Im working in a software where i can create and close VTK windows using QML, all in Qt Creator. The app is working fine, i can plot my samples is the way i want, even using 2D vtk versions (using ContextView) and 3D…

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## [why vtkpolydata is defferent form the vtkactor read from vrml use vtkVRMLImporter？](https://discourse.vtk.org/t/why-vtkpolydata-is-defferent-form-the-vtkactor-read-from-vrml-use-vtkvrmlimporter/16248)

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**Author:** [@sophia](https://discourse.vtk.org/u/sophia)\
**Replies:** 2\
**Last updated:** [January 27, 2026, 3:04am UTC](https://discourse.vtk.org/t/why-vtkpolydata-is-defferent-form-the-vtkactor-read-from-vrml-use-vtkvrmlimporter/16248 "2026-01-27T03:04:07Z")

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when the file is below： #VRML V2.0 utf8 Transform { children \[ Shape { geometry Cylinder { radius 2.0 height 40.0 } } \] } there is different between the vtkpolydata and the vtkactor read from vrml use vtkVRM…

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## [Fedora dnf python3-vtk version is almost three years old](https://discourse.vtk.org/t/fedora-dnf-python3-vtk-version-is-almost-three-years-old/16249)

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**Author:** [@PhilipDeegan](https://discourse.vtk.org/u/PhilipDeegan)\
**Replies:** 3\
**Last updated:** [January 22, 2026, 12:39am UTC](https://discourse.vtk.org/t/fedora-dnf-python3-vtk-version-is-almost-three-years-old/16249 "2026-01-22T00:39:40Z")

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Hi, Just wondering if you advise to use the pip version of python3-vtk, rather than the one from dnf which seems to be a bit old at this point. https://packages.fedoraproject.org/pkgs/vtk/python3-vtk/fedora-43.html vs …

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## [Partitioning large meshes with uneven cell distribution](https://discourse.vtk.org/t/partitioning-large-meshes-with-uneven-cell-distribution/16241)

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**Author:** [@PathosV](https://discourse.vtk.org/u/PathosV)\
**Replies:** 0\
**Last updated:** [January 18, 2026, 7:07pm UTC](https://discourse.vtk.org/t/partitioning-large-meshes-with-uneven-cell-distribution/16241 "2026-01-18T19:07:27Z")

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I’m trying to find a partitioning method that can scale for large unstructured meshes. I need to support mesh sizes that can be several hundred million cells. I’m aware of vtkRedistributeDataSetFilter, and I’ve accessed…

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## [Rendering artifacts with edge visibility and transparency](https://discourse.vtk.org/t/rendering-artifacts-with-edge-visibility-and-transparency/16235)

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**Author:** [@Andrea\_Gavana](https://discourse.vtk.org/u/Andrea_Gavana)\
**Replies:** 3\
**Last updated:** [January 16, 2026, 7:49pm UTC](https://discourse.vtk.org/t/rendering-artifacts-with-edge-visibility-and-transparency/16235 "2026-01-16T19:49:14Z")

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Dear VTK users/developers, I have the super simple script below (in Python). Even running with VTK 9.5.2 (from PyPI) on Windows 11 64 bit and Python 3.9, I get rendering artifacts: The picture is just a simple polyh…

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## [Data consistency question regarding vtkhdf and OverlappingAMR](https://discourse.vtk.org/t/data-consistency-question-regarding-vtkhdf-and-overlappingamr/16229)

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**Author:** [@PhilipDeegan](https://discourse.vtk.org/u/PhilipDeegan)\
**Replies:** 2\
**Last updated:** [January 16, 2026, 3:25pm UTC](https://discourse.vtk.org/t/data-consistency-question-regarding-vtkhdf-and-overlappingamr/16229 "2026-01-16T15:25:18Z")

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Hi there, I’m wondering, does the OverlappingAMR VTKHDF format need to be padded with zeros or duplicate values for the case where a level might be missing across time? For instance, if I write point data/boxes etc for…

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## [Global point ids and vtkMultiPieceDataSet](https://discourse.vtk.org/t/global-point-ids-and-vtkmultipiecedataset/16237)

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**Author:** [@olesenm](https://discourse.vtk.org/u/olesenm)\
**Replies:** 0\
**Last updated:** [January 15, 2026, 3:38pm UTC](https://discourse.vtk.org/t/global-point-ids-and-vtkmultipiecedataset/16237 "2026-01-15T15:38:51Z")

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I’m trying to revisit an old problem of artifacts at processor boundaries (simulation data source: openfoam). In our VTK handling we are using vtkMultiPieceDataSet, with one piece per MPI rank. Since each individual piec…

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## [vtkGLTFWriter: a working example?](https://discourse.vtk.org/t/vtkgltfwriter-a-working-example/11620)

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**Author:** [@bistek](https://discourse.vtk.org/u/bistek)\
**Replies:** 6\
**Last updated:** [January 15, 2026, 8:20am UTC](https://discourse.vtk.org/t/vtkgltfwriter-a-working-example/11620 "2026-01-15T08:20:43Z")

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Hello, does anybody have a working example of vtkGLTFWriter(). The documentation is very concise, and I’m trying different patterns similar to other writers, but I always get the error: Process finished with exit code …

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## [\[HELP\]VTK vtkGPUVolumeRayCastMapper Not Working Properly on Mac Parallel Desktop Windows (Volume Invisible/Ghost Shadows)](https://discourse.vtk.org/t/help-vtk-vtkgpuvolumeraycastmapper-not-working-properly-on-mac-parallel-desktop-windows-volume-invisible-ghost-shadows/16230)

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**Author:** [@yujhuang](https://discourse.vtk.org/u/yujhuang)\
**Replies:** 0\
**Last updated:** [January 14, 2026, 8:43am UTC](https://discourse.vtk.org/t/help-vtk-vtkgpuvolumeraycastmapper-not-working-properly-on-mac-parallel-desktop-windows-volume-invisible-ghost-shadows/16230 "2026-01-14T08:43:45Z")

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Hi everyone, I am implementing a volume rendering Interaction feature using vtkImageData and vtkGPUVolumeRayCastMapper, and it works well on Windows & Normal PCs. Until recently, when I try to run it on MacBook Windows…

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## [\[Help\] Discrepancy between ParaView and VTK C++: vtkCleanPolyData works, but mesh shatters after computing normals](https://discourse.vtk.org/t/help-discrepancy-between-paraview-and-vtk-c-vtkcleanpolydata-works-but-mesh-shatters-after-computing-normals/16227)

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**Author:** [@zhichaozheng322](https://discourse.vtk.org/u/zhichaozheng322)\
**Replies:** 2\
**Last updated:** [January 14, 2026, 3:54am UTC](https://discourse.vtk.org/t/help-discrepancy-between-paraview-and-vtk-c-vtkcleanpolydata-works-but-mesh-shatters-after-computing-normals/16227 "2026-01-14T03:54:33Z")

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Hi everyone, I am implementing a mesh cutting feature using vtkBoxClipDataSet on arbitrary meshes. Input: Arbitrary vtkPolyData constructed from triangle parameters (in my current test case, the geometry happens to b…

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## [Build VTK 9.3 with MINGW, using CMake in Debug](https://discourse.vtk.org/t/build-vtk-9-3-with-mingw-using-cmake-in-debug/16223)

<div class="topic-metadata">

**Author:** [@Joaquin\_Opazo](https://discourse.vtk.org/u/Joaquin_Opazo)\
**Replies:** 3\
**Last updated:** [January 13, 2026, 8:14am UTC](https://discourse.vtk.org/t/build-vtk-9-3-with-mingw-using-cmake-in-debug/16223 "2026-01-13T08:14:11Z")

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Hi all! I had tried everything to build vtk 9.3 with MINGW and cmake. I already tried the ‘-fcommon’ flag, the ‘-Wno,mbig’, ‘-O1’, ‘-O2’, ‘-Og’. And im still getting this error collect2.exe: error: ld returned 1 exit …

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## [vtkOpenGLRenderWindow failed with pyinstaller](https://discourse.vtk.org/t/vtkopenglrenderwindow-failed-with-pyinstaller/16204)

<div class="topic-metadata">

**Author:** [@BotellaA](https://discourse.vtk.org/u/BotellaA)\
**Replies:** 11\
**Last updated:** [January 12, 2026, 7:21pm UTC](https://discourse.vtk.org/t/vtkopenglrenderwindow-failed-with-pyinstaller/16204 "2026-01-12T19:21:05Z")

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I have a Python VTK app working on Linux. I am trying to use pyinstaller to package the app for distribution. Once the app is packaged, I got this error: 2025-12-31 08:42:19.054 ( 2.472s) \[ 70800EFF9080\]vtkXOpenGLR…

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