# Support

**URL:** https://discourse.vtk.org/c/support/6.md

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

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## [About the Support category](https://discourse.vtk.org/t/about-the-support-category/39)

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**Author:** [@cory.quammen](https://discourse.vtk.org/u/cory.quammen)\
**Replies:** 2\
**Last updated:** [July 4, 2019, 1:07pm UTC](https://discourse.vtk.org/t/about-the-support-category/39 "2019-07-04T13:07:38Z")

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A place for questions about VTK usage, building, and installation as well as general discussion about VTK.

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## [Gitlab availability part 2](https://discourse.vtk.org/t/gitlab-availability-part-2/16535)

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**Author:** [@berk.geveci](https://discourse.vtk.org/u/berk.geveci)\
**Replies:** 35\
**Last updated:** [September 24, 2026, 1:08pm UTC](https://discourse.vtk.org/t/gitlab-availability-part-2/16535 "2026-09-24T13:08:22Z")

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See GitLab availability and preservation of VTK’s community history The full vm on which gitlab.kitware.com is backed up every 12 hours to our local storage in the server room. These are backed up to a raided storage a…

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## [Changes in VTK lagacy format from V3.0 to V5.0 - causes cell offset error](https://discourse.vtk.org/t/changes-in-vtk-lagacy-format-from-v3-0-to-v5-0-causes-cell-offset-error/16541)

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**Author:** [@KimF](https://discourse.vtk.org/u/KimF)\
**Replies:** 8\
**Last updated:** [September 23, 2026, 10:48pm UTC](https://discourse.vtk.org/t/changes-in-vtk-lagacy-format-from-v3-0-to-v5-0-causes-cell-offset-error/16541 "2026-09-23T22:48:45Z")

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I’m trying to write a legacy VTK file for an unstructured tetrahedral grid. All of the VTK documentation I can find suggests that the cell linkage block should have a header as follows CELLS \<# cells\> \<total number of p…

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## [VTKRuledSurface Bug?](https://discourse.vtk.org/t/vtkruledsurface-bug/8102)

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**Author:** [@DAsphyxia](https://discourse.vtk.org/u/DAsphyxia)\
**Replies:** 9\
**Last updated:** [September 21, 2026, 5:48pm UTC](https://discourse.vtk.org/t/vtkruledsurface-bug/8102 "2026-09-21T17:48:50Z")

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I tried to use vtkRuledSurfaceFilter to extrude a circle along a spline curve, but some error unexpected happened as shown in the figure below.Some triangle cells are just missed after this option and I have tried all th…

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## [vtkSTLReader fails, when binary STL starts with keyword 'solid'](https://discourse.vtk.org/t/vtkstlreader-fails-when-binary-stl-starts-with-keyword-solid/16539)

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**Author:** [@HST](https://discourse.vtk.org/u/HST)\
**Replies:** 3\
**Last updated:** [September 18, 2026, 6:14am UTC](https://discourse.vtk.org/t/vtkstlreader-fails-when-binary-stl-starts-with-keyword-solid/16539 "2026-09-18T06:14:46Z")

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In VTK 9.7.0 the vtkSTLReader fails, when a binary STL file starts with the keyword ‘solid’. I used version 9.5.2 before. This version accepted the same file. In the described case, vtkSTLReader::ReadASCIISTL() is calle…

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## [Windows on ARM (ARM64) CI support for VTK](https://discourse.vtk.org/t/windows-on-arm-arm64-ci-support-for-vtk/16538)

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**Author:** [@Harishmcw](https://discourse.vtk.org/u/Harishmcw)\
**Replies:** 2\
**Last updated:** [September 17, 2026, 2:03pm UTC](https://discourse.vtk.org/t/windows-on-arm-arm64-ci-support-for-vtk/16538 "2026-09-17T14:03:04Z")

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Hello everyone, We would like to ask about adding Windows on ARM (ARM64) CI support for VTK. Currently, VTK’s Windows CI builds and wheels are x86\_64 only. With the growing adoption of Windows on ARM devices, adding a …

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## [GitLab availability and preservation of VTK’s community history](https://discourse.vtk.org/t/gitlab-availability-and-preservation-of-vtk-s-community-history/16533)

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**Author:** [@banesullivan](https://discourse.vtk.org/u/banesullivan)\
**Replies:** 25\
**Last updated:** [September 16, 2026, 8:18pm UTC](https://discourse.vtk.org/t/gitlab-availability-and-preservation-of-vtk-s-community-history/16533 "2026-09-16T20:18:28Z")

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The current reliability of gitlab.kitware.com has me concerned for the project’s rich ~30 year history with countless community discussions and contributions. VTK has become so foundational and impactful that its availa…

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## [How to render coincident cells?](https://discourse.vtk.org/t/how-to-render-coincident-cells/16516)

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**Author:** [@raungst](https://discourse.vtk.org/u/raungst)\
**Replies:** 2\
**Last updated:** [September 16, 2026, 3:15pm UTC](https://discourse.vtk.org/t/how-to-render-coincident-cells/16516 "2026-09-16T15:15:03Z")

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I sometimes have coincident cells in the same unstructured grid / actor. My problem is that neither one of them renders when this happens. If I hide one of them, the other one shows up. I’ve tried both SetResolveCoincide…

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## [Trouble in pip installing vtk-osmesa](https://discourse.vtk.org/t/trouble-in-pip-installing-vtk-osmesa/14890)

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**Author:** [@natsu\_mizu](https://discourse.vtk.org/u/natsu_mizu)\
**Replies:** 22\
**Last updated:** [September 15, 2026, 1:53am UTC](https://discourse.vtk.org/t/trouble-in-pip-installing-vtk-osmesa/14890 "2026-09-15T01:53:05Z")

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I’ve been using vtk-osmesa installed with pip as pip install --extra-index-url https://wheels.vtk.org vtk-osmesa, following this post: Status Update: VTK Python Wheels - Announcements - VTK OS: “Rocky Linux 8.6 (Green …

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## [Issues using vtkPReflectionFilter](https://discourse.vtk.org/t/issues-using-vtkpreflectionfilter/16530)

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**Author:** [@arey505](https://discourse.vtk.org/u/arey505)\
**Replies:** 0\
**Last updated:** [September 11, 2026, 6:44pm UTC](https://discourse.vtk.org/t/issues-using-vtkpreflectionfilter/16530 "2026-09-11T18:44:58Z")

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Hello, I am trying to use vtkPReflectionFilter to apply symmetry to a surface mesh and I am unable to remove seam at the reflection plane. Here is the code snippet: vtkNew\<vtkIOSSReader\> reader; reader-\>SetFileNa…

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## [Issue with VTK 9.7.0 maven artifacts for Java](https://discourse.vtk.org/t/issue-with-vtk-9-7-0-maven-artifacts-for-java/16528)

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**Author:** [@Marco\_Sambin](https://discourse.vtk.org/u/Marco_Sambin)\
**Replies:** 0\
**Last updated:** [September 10, 2026, 5:03pm UTC](https://discourse.vtk.org/t/issue-with-vtk-9-7-0-maven-artifacts-for-java/16528 "2026-09-10T17:03:26Z")

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Hi all. I am using the latest VTK 9.7.0 from within my Java 21-based application. I am currently using the following Maven artifacts for both the VTK JAR file and the related native libraries: \<dependency\> \<groupI…

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## [loading vtk in java fails](https://discourse.vtk.org/t/loading-vtk-in-java-fails/15467)

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**Author:** [@metamurk](https://discourse.vtk.org/u/metamurk)\
**Replies:** 37\
**Last updated:** [August 27, 2026, 11:51pm UTC](https://discourse.vtk.org/t/loading-vtk-in-java-fails/15467 "2026-08-27T23:51:24Z")

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Hello together, I try to load vtk 9.4.1 into java. I have build with wrappings, vtk jar and wrappings dll are build. I copied it al together and try to to call vtkNativeLibrary.LoadAllNativeLibraries();. It fails. Sev…

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## [unresolved external symbol "void \_\_cdecl vtkRenderingVolume\_AutoInit\_Construct(void)"](https://discourse.vtk.org/t/unresolved-external-symbol-void-cdecl-vtkrenderingvolume-autoinit-construct-void/16478)

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**Author:** [@jsemeda](https://discourse.vtk.org/u/jsemeda)\
**Replies:** 6\
**Last updated:** [August 3, 2026, 1:37pm UTC](https://discourse.vtk.org/t/unresolved-external-symbol-void-cdecl-vtkrenderingvolume-autoinit-construct-void/16478 "2026-08-03T13:37:26Z")

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I am getting this error, vtk-9.5, static libs build with VS under WIndows10. I googled the issue, AI suggested that VTK uses dynamic linking to link the rendering backend at runtime and with static linking that does not…

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## [has anyone gotten the iOS examples to work recently?](https://discourse.vtk.org/t/has-anyone-gotten-the-ios-examples-to-work-recently/13673)

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**Author:** [@davidbaraff](https://discourse.vtk.org/u/davidbaraff)\
**Replies:** 15\
**Last updated:** [July 28, 2026, 7:36pm UTC](https://discourse.vtk.org/t/has-anyone-gotten-the-ios-examples-to-work-recently/13673 "2026-07-28T19:36:10Z")

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I’ve read the instructions on building vtk.framework for IOS and am able to do that. However, whenever I try to build the sample applications, I quickly get stuck on things like: vtkRenderingOpenGL2ObjectFactory.h. (mis…

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## [Overlaying UI mockup PNGs on vtkImageData without hurting picking](https://discourse.vtk.org/t/overlaying-ui-mockup-pngs-on-vtkimagedata-without-hurting-picking/16491)

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**Author:** [@Martyn\_Foster](https://discourse.vtk.org/u/Martyn_Foster)\
**Replies:** 0\
**Last updated:** [July 21, 2026, 6:32am UTC](https://discourse.vtk.org/t/overlaying-ui-mockup-pngs-on-vtkimagedata-without-hurting-picking/16491 "2026-07-21T06:32:47Z")

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Context I’m prototyping a scientific visualization interface where the base render is real vtkImageData (volume slices), but I want to overlay UI chrome and annotation mockups that were generated as static PNGs in a brow…

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## [VTK WebGPU - DepthBuffer issue](https://discourse.vtk.org/t/vtk-webgpu-depthbuffer-issue/16488)

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**Author:** [@Seun](https://discourse.vtk.org/u/Seun)\
**Replies:** 2\
**Last updated:** [July 21, 2026, 1:26am UTC](https://discourse.vtk.org/t/vtk-webgpu-depthbuffer-issue/16488 "2026-07-21T01:26:04Z")

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Hello guys, I was wondering if someone has experienced this or perhaps I’m approaching this task the wrong way. I am currently testing out a bunch of things regarding WebGPU, however I can’t seem to get the Depth buffer…

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## [vtkGDALRasterReader may not load some TIF files correctly](https://discourse.vtk.org/t/vtkgdalrasterreader-may-not-load-some-tif-files-correctly/16471)

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**Author:** [@tholland](https://discourse.vtk.org/u/tholland)\
**Replies:** 4\
**Last updated:** [June 25, 2026, 12:26pm UTC](https://discourse.vtk.org/t/vtkgdalrasterreader-may-not-load-some-tif-files-correctly/16471 "2026-06-25T12:26:49Z")

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For some TIF files, the GDAL raster reader (vtkGDALRasterReader class) does not fully initialize its internal GDALData object. Specifically, the GetSpacialRef method of the object returns a nullptr with certain TIF files…

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## [Build error C4996 in vtkUnstructuredGrid.h after Visual Studio update (VTK 9.6)](https://discourse.vtk.org/t/build-error-c4996-in-vtkunstructuredgrid-h-after-visual-studio-update-vtk-9-6/16470)

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**Author:** [@CharInt0](https://discourse.vtk.org/u/CharInt0)\
**Replies:** 13\
**Last updated:** [June 24, 2026, 5:34pm UTC](https://discourse.vtk.org/t/build-error-c4996-in-vtkunstructuredgrid-h-after-visual-studio-update-vtk-9-6/16470 "2026-06-24T17:34:43Z")

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OS: Windows 11 VTK Version: 9.6 Compiler: Visual Studio Professional 2026 (v18.7.1) Hi everyone, Since updating Visual Studio to the latest version, my C++ project using VTK 9.6 has stopped compiling. I am encounteri…

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## [How to propagate non-VTK data in the pipeline in a simple way?](https://discourse.vtk.org/t/how-to-propagate-non-vtk-data-in-the-pipeline-in-a-simple-way/16472)

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**Author:** [@CsatiZoltan](https://discourse.vtk.org/u/CsatiZoltan)\
**Replies:** 4\
**Last updated:** [June 23, 2026, 10:50pm UTC](https://discourse.vtk.org/t/how-to-propagate-non-vtk-data-in-the-pipeline-in-a-simple-way/16472 "2026-06-23T22:50:53Z")

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I have a ParaView reader plugin in Python, which stores the path to the opened file. I want to implement various operations on the file that was read by the reader. So I write one filter for each operation. This way, I h…

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## [vtk 9.6.2 msvc2022 C++20 using issue](https://discourse.vtk.org/t/vtk-9-6-2-msvc2022-c-20-using-issue/16466)

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**Author:** [@APlenkin](https://discourse.vtk.org/u/APlenkin)\
**Replies:** 3\
**Last updated:** [June 19, 2026, 12:25pm UTC](https://discourse.vtk.org/t/vtk-9-6-2-msvc2022-c-20-using-issue/16466 "2026-06-19T12:25:57Z")

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Hello, I am continue migration to 9.6.2 and now I have issue building my project with vtk with c++20 (no issue for c++17). I got error Error C7595 ‘vtkfmt::v12::fstring\<bool &,bool &,const bool &\>::fstring’: call to i…

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## [vtkCellPicker ignores block visibility in vtkMultiBlockDataSet](https://discourse.vtk.org/t/vtkcellpicker-ignores-block-visibility-in-vtkmultiblockdataset/16462)

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**Author:** [@MaxNumerique](https://discourse.vtk.org/u/MaxNumerique)\
**Replies:** 5\
**Last updated:** [June 18, 2026, 2:26pm UTC](https://discourse.vtk.org/t/vtkcellpicker-ignores-block-visibility-in-vtkmultiblockdataset/16462 "2026-06-18T14:26:37Z")

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Hi everyone ! When hiding a block of a vtkMultiBlockDataSet using vtkCompositeDataDisplayAttributes.SetBlockVisibility(block, False), vtkCellPicker still picks the hidden block when a pick operation is performed. It se…

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## [vtk 9.6.2 build error](https://discourse.vtk.org/t/vtk-9-6-2-build-error/16461)

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**Author:** [@APlenkin](https://discourse.vtk.org/u/APlenkin)\
**Replies:** 3\
**Last updated:** [June 17, 2026, 1:03pm UTC](https://discourse.vtk.org/t/vtk-9-6-2-build-error/16461 "2026-06-17T13:03:10Z")

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Hello, I am trying to upgrade from 9.5.2 to 9.6.2. But I got few errors durin build. C:\\Users\\golde\\Desktop\\VTK-9.6.2\\ThirdParty\\scn\\vtkscn\\src\\vtkscn\\impl.h(713): error C2131: expression did not evaluate to a constant …

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## [Calculate slope of surface elevation](https://discourse.vtk.org/t/calculate-slope-of-surface-elevation/16458)

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**Author:** [@albgabor](https://discourse.vtk.org/u/albgabor)\
**Replies:** 1\
**Last updated:** [June 16, 2026, 7:42am UTC](https://discourse.vtk.org/t/calculate-slope-of-surface-elevation/16458 "2026-06-16T07:42:13Z")

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Hi all, I’m trying to calculate the slope(s) of a 3D surface. Specifically I am working on some wind simulations over wavy surfaces, where I can extract some variables (velocities and pressure) from the simulation at t…

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## [VTK import of OBJ files](https://discourse.vtk.org/t/vtk-import-of-obj-files/16444)

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**Author:** [@scruffy](https://discourse.vtk.org/u/scruffy)\
**Replies:** 15\
**Last updated:** [June 16, 2026, 1:42am UTC](https://discourse.vtk.org/t/vtk-import-of-obj-files/16444 "2026-06-16T01:42:55Z")

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VTK is ignoring the “o” specifier in Wavefront OBJ files. Blender is one of the few programs that handles this correctly. To see the issue, create 2 cylinders in Blender and export as OBJ, then read into VTK. You only g…

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## [vtkCellLinks.GetCells (vtkIdType ptId) not accessible from Java wrapper](https://discourse.vtk.org/t/vtkcelllinks-getcells-vtkidtype-ptid-not-accessible-from-java-wrapper/16442)

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**Author:** [@jMaxR](https://discourse.vtk.org/u/jMaxR)\
**Replies:** 5\
**Last updated:** [June 11, 2026, 12:09am UTC](https://discourse.vtk.org/t/vtkcelllinks-getcells-vtkidtype-ptid-not-accessible-from-java-wrapper/16442 "2026-06-11T00:09:14Z")

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I use vtk 9.5 with java wrapper. vtkCellLinks can be instantiated and built (with BuildLinks()), but GetLink() and GetCells() simply do not appear in the Java wrapper. I can’t figure out how vtkCellLinks can be useful if…

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## [Using vtkChartXY realtime Memory leak](https://discourse.vtk.org/t/using-vtkchartxy-realtime-memory-leak/16440)

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**Author:** [@Joaquin\_Opazo](https://discourse.vtk.org/u/Joaquin_Opazo)\
**Replies:** 4\
**Last updated:** [June 4, 2026, 8:42am UTC](https://discourse.vtk.org/t/using-vtkchartxy-realtime-memory-leak/16440 "2026-06-04T08:42:16Z")

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Hi all! I hope all doing right, i have a question concerning vtkChartXY. Im trying to use vtkChartXY to create a realtime plot, when i mean realtime is to plot samples in the grid, and at render time, erase all and rep…

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## [WebGPU+VTK](https://discourse.vtk.org/t/webgpu-vtk/16437)

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**Author:** [@Seun](https://discourse.vtk.org/u/Seun)\
**Replies:** 11\
**Last updated:** [May 28, 2026, 1:59pm UTC](https://discourse.vtk.org/t/webgpu-vtk/16437 "2026-05-28T13:59:34Z")

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Hello @jaswantp by any chance do you know why this could be the case, I had few weeks ago successfully built + compiled dawn with VTK and able to write a sample application using this v20251002.162335. However, I notice…

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## [Public DICOMweb endpoint for VolView](https://discourse.vtk.org/t/public-dicomweb-endpoint-for-volview/16426)

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**Author:** [@MartinBellehumeur](https://discourse.vtk.org/u/MartinBellehumeur)\
**Replies:** 1\
**Last updated:** [May 20, 2026, 6:52am UTC](https://discourse.vtk.org/t/public-dicomweb-endpoint-for-volview/16426 "2026-05-20T06:52:23Z")

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HI, I’m looking for a public dicomweb endpoint that works with volview.

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## [crash with two rendering threads using text rendering (freetype)](https://discourse.vtk.org/t/crash-with-two-rendering-threads-using-text-rendering-freetype/15159)

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**Author:** [@codeling](https://discourse.vtk.org/u/codeling)\
**Replies:** 10\
**Last updated:** [May 13, 2026, 7:30pm UTC](https://discourse.vtk.org/t/crash-with-two-rendering-threads-using-text-rendering-freetype/15159 "2026-05-13T19:30:18Z")

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I think I’m currently hitting this old bug; I’ve commented on it, but I’m not sure anybody will see it there. My issue: I run two separate render threads, one addressing a VR render window, the other addressing screen r…

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## [VTK 9.6 ONNX runtime installation](https://discourse.vtk.org/t/vtk-9-6-onnx-runtime-installation/16410)

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**Author:** [@JudyZ](https://discourse.vtk.org/u/JudyZ)\
**Replies:** 7\
**Last updated:** [May 12, 2026, 7:45am UTC](https://discourse.vtk.org/t/vtk-9-6-onnx-runtime-installation/16410 "2026-05-12T07:45:58Z")

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Hi, I tried to install ONNX runtime in order to use the new filter FiltersONNX. But I got some issues. First of all, I get an error message that the supported API versions is only \[1, 17\]. So normally, I can use 1.17.1 i…

[Next page](https://discourse.vtk.org/c/support/6.md?page=1)