# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=3

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

**Page:** 4

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## [Changing the axis colors in vtkCameraOrientationWidget](https://discourse.vtk.org/t/changing-the-axis-colors-in-vtkcameraorientationwidget/14664)

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**Author:** [@Connor9220](https://discourse.vtk.org/u/Connor9220)\
**Replies:** 3\
**Last updated:** [January 12, 2026, 2:01pm UTC](https://discourse.vtk.org/t/changing-the-axis-colors-in-vtkcameraorientationwidget/14664 "2026-01-12T14:01:17Z")

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The AXIS colors in the vtkCameraOrientationWidget are non standard, and I can’t figure out how to change them. Doesn’t look like there is a way to do this? Help?

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## [MPR slice interaction causes background to expand](https://discourse.vtk.org/t/mpr-slice-interaction-causes-background-to-expand/16222)

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**Author:** [@KSJ](https://discourse.vtk.org/u/KSJ)\
**Replies:** 0\
**Last updated:** [January 12, 2026, 1:11pm UTC](https://discourse.vtk.org/t/mpr-slice-interaction-causes-background-to-expand/16222 "2026-01-12T13:11:28Z")

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Question I am implementing an MPR viewer using VTK (axial / sagittal / coronal) based on the FourPaneViewer / ResliceCursor examples. My setup includes: vtkResliceImageViewer vtkResliceCursorWidget vtkImagePlan…

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## [\[VTK Java\] Libucs crashes the JVM.](https://discourse.vtk.org/t/vtk-java-libucs-crashes-the-jvm/16215)

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**Author:** [@jMaxR](https://discourse.vtk.org/u/jMaxR)\
**Replies:** 1\
**Last updated:** [January 9, 2026, 10:51pm UTC](https://discourse.vtk.org/t/vtk-java-libucs-crashes-the-jvm/16215 "2026-01-09T22:51:34Z")

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Hello everyone. First, please note that I am asking this question here because the UCX library is required by OpenMPI, which is itself required by VTK. The problem may not be intrinsically related to VTK, but I only enc…

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## [How to improve enhancement based on volume rendering](https://discourse.vtk.org/t/how-to-improve-enhancement-based-on-volume-rendering/16209)

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**Author:** [@yangp](https://discourse.vtk.org/u/yangp)\
**Replies:** 6\
**Last updated:** [January 9, 2026, 2:11am UTC](https://discourse.vtk.org/t/how-to-improve-enhancement-based-on-volume-rendering/16209 "2026-01-09T02:11:11Z")

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I have no idea to achieve this effect? Can someone help me?Thank you!

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## [Instructions Wanted for Building VTK apps with Software Rendering on Windows](https://discourse.vtk.org/t/instructions-wanted-for-building-vtk-apps-with-software-rendering-on-windows/16216)

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**Author:** [@niconiconi](https://discourse.vtk.org/u/niconiconi)\
**Replies:** 2\
**Last updated:** [January 8, 2026, 4:41pm UTC](https://discourse.vtk.org/t/instructions-wanted-for-building-vtk-apps-with-software-rendering-on-windows/16216 "2026-01-08T16:41:58Z")

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I have a VTK application which I want to run on Windows 11 without a GPU. Currently, starting it causes an immediate crash due to lack of OpenGL: Failed to load opengl32sw (The specified module could not be found.) Fail…

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## [\[Java JNI\] JVM crashes when jni libs are loaded twice](https://discourse.vtk.org/t/java-jni-jvm-crashes-when-jni-libs-are-loaded-twice/16191)

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**Author:** [@jMaxR](https://discourse.vtk.org/u/jMaxR)\
**Replies:** 1\
**Last updated:** [January 8, 2026, 12:00pm UTC](https://discourse.vtk.org/t/java-jni-jvm-crashes-when-jni-libs-are-loaded-twice/16191 "2026-01-08T12:00:32Z")

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Hello everyone, I am currently porting my application from Java 14 to Java 17 and have encountered a crash that I do not understand. To illustrate this, I used the JFrameRenderer example (https://examples.vtk.org/site/J…

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## [vtkPanel & native Render() issues when rearranging the swing components in a live JFrame (java, swing, vtk 9.2.6)](https://discourse.vtk.org/t/vtkpanel-native-render-issues-when-rearranging-the-swing-components-in-a-live-jframe-java-swing-vtk-9-2-6/15996)

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**Author:** [@Julien](https://discourse.vtk.org/u/Julien)\
**Replies:** 3\
**Last updated:** [January 8, 2026, 12:54am UTC](https://discourse.vtk.org/t/vtkpanel-native-render-issues-when-rearranging-the-swing-components-in-a-live-jframe-java-swing-vtk-9-2-6/15996 "2026-01-08T00:54:47Z")

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Hello Everyone, I develop a Java swing application that has a user interface that allows moving the JComponents in a live JFrame. I can totally instanciate my vtkPanels and add them to a JFrame I am building and then t…

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## [VTK vtkSliderRepresentation2D to : scrollbar height changes when resizing window width only (using Display coordinates)](https://discourse.vtk.org/t/vtk-vtksliderrepresentation2d-to-scrollbar-height-changes-when-resizing-window-width-only-using-display-coordinates/16210)

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**Author:** [@marlon.ma](https://discourse.vtk.org/u/marlon.ma)\
**Replies:** 1\
**Last updated:** [January 7, 2026, 2:04pm UTC](https://discourse.vtk.org/t/vtk-vtksliderrepresentation2d-to-scrollbar-height-changes-when-resizing-window-width-only-using-display-coordinates/16210 "2026-01-07T14:04:33Z")

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Description I am using vtkSliderWidget with vtkSliderRepresentation2Dto implement a vertical scrollbar for a thumbnail strip view. My goal is: Pixel-precise control of scrollbar geometry Scrollbar height should re…

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## [\[Volume Rendering\] Incorrect Depth Occlusion Between Two Intersecting Spheres in VTK 9.1.0](https://discourse.vtk.org/t/volume-rendering-incorrect-depth-occlusion-between-two-intersecting-spheres-in-vtk-9-1-0/16177)

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**Author:** [@maomaolemon](https://discourse.vtk.org/u/maomaolemon)\
**Replies:** 1\
**Last updated:** [January 7, 2026, 4:22am UTC](https://discourse.vtk.org/t/volume-rendering-incorrect-depth-occlusion-between-two-intersecting-spheres-in-vtk-9-1-0/16177 "2026-01-07T04:22:36Z")

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\[Note: English is not my first language, so please let me know if anything is unclear.\] I’m working on a scientific visualization project using VTK 9.1.0 with C++, where I need to render two intersecting, completely opa…

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## [pixelated artifacts in native vtk implementation compared to pyvista](https://discourse.vtk.org/t/pixelated-artifacts-in-native-vtk-implementation-compared-to-pyvista/16207)

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**Author:** [@jonaspleyer](https://discourse.vtk.org/u/jonaspleyer)\
**Replies:** 2\
**Last updated:** [January 5, 2026, 1:40pm UTC](https://discourse.vtk.org/t/pixelated-artifacts-in-native-vtk-implementation-compared-to-pyvista/16207 "2026-01-05T13:40:11Z")

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Hey everyone, I am having trouble, figuring out the reason for why I am seeing pixelated artifacts in one of my renders. I have a pipline which works well for my purpose and is implemented in pyvista. I wanted to recrea…

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## [How to create a coordinate axis cross (X+/X−, Y+/Y−, Z+/Z−) like in GeoGebra 3D?](https://discourse.vtk.org/t/how-to-create-a-coordinate-axis-cross-x-x-y-y-z-z-like-in-geogebra-3d/16201)

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**Author:** [@Filip\_Huser](https://discourse.vtk.org/u/Filip_Huser)\
**Replies:** 0\
**Last updated:** [December 28, 2025, 5:34pm UTC](https://discourse.vtk.org/t/how-to-create-a-coordinate-axis-cross-x-x-y-y-z-z-like-in-geogebra-3d/16201 "2025-12-28T17:34:03Z")

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Hello everyone, I would like to ask for advice on how to create a 3D coordinate axis cross that includes positive and negative directions of all axes (X+, X−, Y+, Y−, Z+, Z−), similar to how it is shown in GeoGebra 3D. …

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## [Crash in ToLowercase()](https://discourse.vtk.org/t/crash-in-tolowercase/5247)

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**Author:** [@bartoli](https://discourse.vtk.org/u/bartoli)\
**Replies:** 16\
**Last updated:** [December 28, 2025, 5:23pm UTC](https://discourse.vtk.org/t/crash-in-tolowercase/5247 "2025-12-28T17:23:24Z")

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I am using a VTK 9.0.1 that i just built. I only try to run some examples for now. Exemples that only use vtkMath work with no issues. But when trying some examples that do visual things, i end up getting a crash. Wit…

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## [Is it necessary to call vtkRenderWindow::Render() after adjusting the camera?](https://discourse.vtk.org/t/is-it-necessary-to-call-vtkrenderwindow-render-after-adjusting-the-camera/16183)

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**Author:** [@jie\_baoer](https://discourse.vtk.org/u/jie_baoer)\
**Replies:** 10\
**Last updated:** [December 24, 2025, 3:49am UTC](https://discourse.vtk.org/t/is-it-necessary-to-call-vtkrenderwindow-render-after-adjusting-the-camera/16183 "2025-12-24T03:49:53Z")

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Hello, everyone After adjusting the position of the vtkCamera, I need to call vtkRenderWindow::Render() to refresh the view. However, in my application scenario (1 million nodes in Debug mode), each call to Render() tak…

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## [VTK build fails on Windows when Python type hints are requested (VTK\_BUILD\_PYI\_FILES)](https://discourse.vtk.org/t/vtk-build-fails-on-windows-when-python-type-hints-are-requested-vtk-build-pyi-files/16192)

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**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 2\
**Last updated:** [December 22, 2025, 3:24pm UTC](https://discourse.vtk.org/t/vtk-build-fails-on-windows-when-python-type-hints-are-requested-vtk-build-pyi-files/16192 "2025-12-22T15:24:36Z")

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Hello, I’m building VTK 9.5.2 on Windows and all is well until I request Python type hints with VTK\_BUILD\_PYI\_FILES. The build fails with the following error Severity Code Description Project File Line Suppression Sta…

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## [vtkSurfaceNets3D and holes on the extracted surfaces](https://discourse.vtk.org/t/vtksurfacenets3d-and-holes-on-the-extracted-surfaces/16132)

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**Author:** [@aborsic](https://discourse.vtk.org/u/aborsic)\
**Replies:** 6\
**Last updated:** [December 18, 2025, 11:02pm UTC](https://discourse.vtk.org/t/vtksurfacenets3d-and-holes-on-the-extracted-surfaces/16132 "2025-12-18T23:02:31Z")

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Hello Everyone, I am experimenting with vtkSurfaceNets3D which is a great addition to VTK. In particular I am running it on a label image which derives from the segmentation of a CT scan. I am using a super simple Pytho…

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## [VTK 9.5.2: vtk\_glad linker errors](https://discourse.vtk.org/t/vtk-9-5-2-vtk-glad-linker-errors/16174)

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**Author:** [@VCharles](https://discourse.vtk.org/u/VCharles)\
**Replies:** 19\
**Last updated:** [December 16, 2025, 3:40pm UTC](https://discourse.vtk.org/t/vtk-9-5-2-vtk-glad-linker-errors/16174 "2025-12-16T15:40:56Z")

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Hello, I’m upgrading my solution from VTK 8.2.2 to 9.5.2 and have built VTK 9.5.0 as static libraries. After updating my code, I’m encountering linker errors: error LNK2001: unresolved external symbol vtk\_glad\_\* If I …

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## [No "Blocks" checkbox section with VTKHDF MultiBlockDataSet format](https://discourse.vtk.org/t/no-blocks-checkbox-section-with-vtkhdf-multiblockdataset-format/16180)

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**Author:** [@nncarlson](https://discourse.vtk.org/u/nncarlson)\
**Replies:** 5\
**Last updated:** [December 12, 2025, 3:20pm UTC](https://discourse.vtk.org/t/no-blocks-checkbox-section-with-vtkhdf-multiblockdataset-format/16180 "2025-12-12T15:20:43Z")

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I’m looking into by-passing the TRUCHAS reader (builtin to VTK) for our custom HDF5 output by reimplementing the output using the VTKHDF file format. Each cell in the unstructured mesh is tagged with an integer that iden…

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## [\[Volume Rendering\] Rendering artifacts after window refresh and model hide/show operations in VTK 9.1.0](https://discourse.vtk.org/t/volume-rendering-rendering-artifacts-after-window-refresh-and-model-hide-show-operations-in-vtk-9-1-0/16179)

<div class="topic-metadata">

**Author:** [@maomaolemon](https://discourse.vtk.org/u/maomaolemon)\
**Replies:** 0\
**Last updated:** [December 10, 2025, 9:45am UTC](https://discourse.vtk.org/t/volume-rendering-rendering-artifacts-after-window-refresh-and-model-hide-show-operations-in-vtk-9-1-0/16179 "2025-12-10T09:45:45Z")

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Problem Description: I’m using vtkOpenGLGPUVolumeRayCastMapper to render volumetric data imported via vtkImageImport. The data source is a series of 128×128 CV\_8UC1 images, as implemented in my ShowImageData() function …

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## [VTK + OpenCV](https://discourse.vtk.org/t/vtk-opencv/16172)

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**Author:** [@robot105](https://discourse.vtk.org/u/robot105)\
**Replies:** 1\
**Last updated:** [December 5, 2025, 9:28am UTC](https://discourse.vtk.org/t/vtk-opencv/16172 "2025-12-05T09:28:26Z")

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I want to install VTK on my Windows to use OpenCV, I download the vtk-master.zip and unpack and cmake it , when I cmake the OpenCV and direct the directionary of the VTKConfig.cmake, it reports VTK support is disabled. C…

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## [VTK rendering window doesn't display](https://discourse.vtk.org/t/vtk-rendering-window-doesnt-display/16169)

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**Author:** [@Dakom](https://discourse.vtk.org/u/Dakom)\
**Replies:** 9\
**Last updated:** [December 4, 2025, 8:48am UTC](https://discourse.vtk.org/t/vtk-rendering-window-doesnt-display/16169 "2025-12-04T08:48:30Z")

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Hello dear VTK people, I have recently tried installing VTK 9.5 on Ubuntu 24.04 from source (latest .tar.gz release) but when I compile CylinderExample.cxx (from the VTK examples) the window doesn’t show up. I would lik…

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## [QVTKOpenGLNativeWidget has weird left mouse button behavior if KDE Plasma is used](https://discourse.vtk.org/t/qvtkopenglnativewidget-has-weird-left-mouse-button-behavior-if-kde-plasma-is-used/16170)

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**Author:** [@MaxFleur](https://discourse.vtk.org/u/MaxFleur)\
**Replies:** 0\
**Last updated:** [December 3, 2025, 11:00am UTC](https://discourse.vtk.org/t/qvtkopenglnativewidget-has-weird-left-mouse-button-behavior-if-kde-plasma-is-used/16170 "2025-12-03T11:00:33Z")

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I am trying to use the minimal Qt VTK app as specified here on KUbuntu 24.04. This app uses a QVTKOpenGLNativeWidget to display a randomized mesh for interaction. The application has been built and run as specified in th…

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## [FreeLibrary crash](https://discourse.vtk.org/t/freelibrary-crash/16168)

<div class="topic-metadata">

**Author:** [@jie\_baoer](https://discourse.vtk.org/u/jie_baoer)\
**Replies:** 1\
**Last updated:** [December 2, 2025, 1:06pm UTC](https://discourse.vtk.org/t/freelibrary-crash/16168 "2025-12-02T13:06:55Z")

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Hi，Due to poor architectural design, my software now has to rely on the vtk library. Even if the function to be called does not involve vtk, I have not manually called or initialized the objects and functions of vtk. How…

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## [Black screen and vtkOutputWindow errors when replacing interactor in QVTKOpenGLNativeWidget (VTK 9.5.2 + Qt 5.15.0)](https://discourse.vtk.org/t/black-screen-and-vtkoutputwindow-errors-when-replacing-interactor-in-qvtkopenglnativewidget-vtk-9-5-2-qt-5-15-0/16167)

<div class="topic-metadata">

**Author:** [@Artsiom\_Nedzvedz](https://discourse.vtk.org/u/Artsiom_Nedzvedz)\
**Replies:** 0\
**Last updated:** [December 1, 2025, 10:25am UTC](https://discourse.vtk.org/t/black-screen-and-vtkoutputwindow-errors-when-replacing-interactor-in-qvtkopenglnativewidget-vtk-9-5-2-qt-5-15-0/16167 "2025-12-01T10:25:22Z")

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We’re upgrading a Qt/VTK application from VTK 9.0.5 → 9.5.2 (Qt 5.15.0, MSVC 2019 x86, static linking, no CMake). Our custom interactor — a subclass of vtkGenericRenderWindowInteractor — worked flawlessly in VTK 9.0, bu…

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## [ExtractEnclosedPoints giving additional points outside the mesh](https://discourse.vtk.org/t/extractenclosedpoints-giving-additional-points-outside-the-mesh/10484)

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**Author:** [@sjhbusch](https://discourse.vtk.org/u/sjhbusch)\
**Replies:** 8\
**Last updated:** [November 29, 2025, 2:08am UTC](https://discourse.vtk.org/t/extractenclosedpoints-giving-additional-points-outside-the-mesh/10484 "2025-11-29T02:08:57Z")

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Hi, I am new to using more advanced features in VTK. I’m using PyVsta to generate a voxel grid then looking at extracting enclosed points from an STL or mesh. I’ve tried multiple geometries and had the filter return a lo…

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## [vtkTableBasedClipDataSet](https://discourse.vtk.org/t/vtktablebasedclipdataset/16162)

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**Author:** [@keke](https://discourse.vtk.org/u/keke)\
**Replies:** 1\
**Last updated:** [November 28, 2025, 9:32am UTC](https://discourse.vtk.org/t/vtktablebasedclipdataset/16162 "2025-11-28T09:32:27Z")

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I am using vtkTableBasedClipDataSet to clip a vtkUnstructuredGrid. How can I determine which points in the output vtkUnstructuredGrid are newly generated?

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## [Help on simple vtkLocalView camera update](https://discourse.vtk.org/t/help-on-simple-vtklocalview-camera-update/16141)

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**Author:** [@Zachary\_Germain](https://discourse.vtk.org/u/Zachary_Germain)\
**Replies:** 1\
**Last updated:** [November 28, 2025, 1:54am UTC](https://discourse.vtk.org/t/help-on-simple-vtklocalview-camera-update/16141 "2025-11-28T01:54:37Z")

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Hi, I found a thread from August Update camera in trame vtkLocalView where a user asked about updating the camera, and @Sebastien\_Jourdain seemed to have an answer that worked for them - to use widget.push\_camera()or wi…

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## [SSL certificate has expired for https://gitlab.kitware.com/](https://discourse.vtk.org/t/ssl-certificate-has-expired-for-https-gitlab-kitware-com/16157)

<div class="topic-metadata">

**Author:** [@Andrew\_C](https://discourse.vtk.org/u/Andrew_C)\
**Replies:** 2\
**Last updated:** [November 25, 2025, 7:52am UTC](https://discourse.vtk.org/t/ssl-certificate-has-expired-for-https-gitlab-kitware-com/16157 "2025-11-25T07:52:46Z")

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As per the above title, the SSL certificate has expired Cloning into ‘vtk’… fatal: unable to access ‘https://gitlab.kitware.com/vtk/vtk.git/’: SSL certificate problem: certificate has expired

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## [Gamma Correction unavoidable](https://discourse.vtk.org/t/gamma-correction-unavoidable/16155)

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**Author:** [@killer3d](https://discourse.vtk.org/u/killer3d)\
**Replies:** 2\
**Last updated:** [November 25, 2025, 2:35am UTC](https://discourse.vtk.org/t/gamma-correction-unavoidable/16155 "2025-11-25T02:35:47Z")

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https://gitlab.kitware.com/vtk/vtk/-/issues/19849 In https://github.com/Kitware/VTK/blob/master/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx, void main() { float gamma = 2.2; // for each sample in the multi sample buff…

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## [the availability of the Vtk 9.3.0 NuGet package](https://discourse.vtk.org/t/the-availability-of-the-vtk-9-3-0-nuget-package/16146)

<div class="topic-metadata">

**Author:** [@selvant31](https://discourse.vtk.org/u/selvant31)\
**Replies:** 4\
**Last updated:** [November 21, 2025, 7:50am UTC](https://discourse.vtk.org/t/the-availability-of-the-vtk-9-3-0-nuget-package/16146 "2025-11-21T07:50:04Z")

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Hi, I would like to simple development in Linux kitware avalonia controls, i have create virtual box and ubuntu 24.04, i am getting errors of kitware avalonia controls not installed compatable issue, i have dotnet 8.…

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## [Incorrect cell\_data shapes when reading .cas.h5 with vtkFLUENTCFFReader](https://discourse.vtk.org/t/incorrect-cell-data-shapes-when-reading-cas-h5-with-vtkfluentcffreader/16153)

<div class="topic-metadata">

**Author:** [@nmheim](https://discourse.vtk.org/u/nmheim)\
**Replies:** 4\
**Last updated:** [November 20, 2025, 10:12am UTC](https://discourse.vtk.org/t/incorrect-cell-data-shapes-when-reading-cas-h5-with-vtkfluentcffreader/16153 "2025-11-20T10:12:27Z")

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Hey everyone! This is my first post here, so I apologize if its in the wrong category or otherwise not according to the rules. Happy to open this in a different place, if that helps:) I am encountering an issue when rea…

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