# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=1

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

**Page:** 2

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## [Questions about VTK ray tracing roadmap - Anari, visRTX, OptiX](https://discourse.vtk.org/t/questions-about-vtk-ray-tracing-roadmap-anari-visrtx-optix/16375)

<div class="topic-metadata">

**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 5\
**Last updated:** [May 7, 2026, 7:52pm UTC](https://discourse.vtk.org/t/questions-about-vtk-ray-tracing-roadmap-anari-visrtx-optix/16375 "2026-05-07T19:52:58Z")

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I recently built vtk with support for ray tracing - latest VTK : 9.6, ANARI SDK : 0.15, VisRTX : 0.13, NVIDIA OptiX : 8.1 on Windows and the system works well. But there are several gaps between what IS supported in VT…

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## [unexpected behavior when selecting (and "highlighting") cells in trame](https://discourse.vtk.org/t/unexpected-behavior-when-selecting-and-highlighting-cells-in-trame/10333)

<div class="topic-metadata">

**Author:** [@Robert\_Collar](https://discourse.vtk.org/u/Robert_Collar)\
**Replies:** 8\
**Last updated:** [May 7, 2026, 4:16am UTC](https://discourse.vtk.org/t/unexpected-behavior-when-selecting-and-highlighting-cells-in-trame/10333 "2026-05-07T04:16:18Z")

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Hi VTK Community! I’m attempting to adapt the selection highlighting functionality used in this trame example, but the exhibited behavior is unexpected. I’m trying to select cells in a vtkPolyData Object consisting of a …

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## [How to display labels on multiple line cells](https://discourse.vtk.org/t/how-to-display-labels-on-multiple-line-cells/16397)

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**Author:** [@Rudyanto\_Herlambang](https://discourse.vtk.org/u/Rudyanto_Herlambang)\
**Replies:** 1\
**Last updated:** [May 2, 2026, 10:23pm UTC](https://discourse.vtk.org/t/how-to-display-labels-on-multiple-line-cells/16397 "2026-05-02T22:23:48Z")

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I’m currently switching from GDI/GDI+ to VTK but a lot of things still confuse me. I am trying hard to display labels on multiple line cells according to their orientation, as shown in the image below. Since the line di…

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## [Examples of using VTK-m (VisCores) through VTK in Python](https://discourse.vtk.org/t/examples-of-using-vtk-m-viscores-through-vtk-in-python/16400)

<div class="topic-metadata">

**Author:** [@1116](https://discourse.vtk.org/u/1116)\
**Replies:** 0\
**Last updated:** [April 29, 2026, 11:40am UTC](https://discourse.vtk.org/t/examples-of-using-vtk-m-viscores-through-vtk-in-python/16400 "2026-04-29T11:40:36Z")

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Hi all, I’m wondering whether there are any examples of using VTK-m (Viscores) through VTK in a Python script. If I want to enable VTK-m acceleration (for example with CUDA), do I need to recompile VTK with python modu…

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## [Multiple viewports and LIC surfaces](https://discourse.vtk.org/t/multiple-viewports-and-lic-surfaces/16398)

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**Author:** [@Carlos\_Montilla](https://discourse.vtk.org/u/Carlos_Montilla)\
**Replies:** 4\
**Last updated:** [April 28, 2026, 8:02pm UTC](https://discourse.vtk.org/t/multiple-viewports-and-lic-surfaces/16398 "2026-04-28T20:02:07Z")

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Hello, I am trying to build a split view configuration using a single vtkRenderWindow and multiple viewports. Each viewport should render a different dataset using a SurfaceLICMapper, however only the bottom left pane s…

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## [VTK 9.6: How to use GetCellTypes to replace GetCellTypesArray in Python?](https://discourse.vtk.org/t/vtk-9-6-how-to-use-getcelltypes-to-replace-getcelltypesarray-in-python/16396)

<div class="topic-metadata">

**Author:** [@raungst](https://discourse.vtk.org/u/raungst)\
**Replies:** 2\
**Last updated:** [April 24, 2026, 1:36pm UTC](https://discourse.vtk.org/t/vtk-9-6-how-to-use-getcelltypes-to-replace-getcelltypesarray-in-python/16396 "2026-04-24T13:36:45Z")

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I’m trying to upgrade my code to use 9.6 instead of 9.4. I used to use GetCellTypesArray to get the cell type for every cell in my unstructured grid. The deprecation warning says to use GetCellTypes instead. However, thi…

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## [Java wrapper: vtkBoudingBox is not visible](https://discourse.vtk.org/t/java-wrapper-vtkboudingbox-is-not-visible/16395)

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**Author:** [@jMaxR](https://discourse.vtk.org/u/jMaxR)\
**Replies:** 1\
**Last updated:** [April 23, 2026, 2:36pm UTC](https://discourse.vtk.org/t/java-wrapper-vtkboudingbox-is-not-visible/16395 "2026-04-23T14:36:26Z")

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Hi, I’m using VTK via the Java wrapper to display various objects. When I add an object, I have to call ResetCamera() to ensure that my new object is visible. I’d like to handle this using bounding boxes so that I only …

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## [WebGPU setup (macOS)](https://discourse.vtk.org/t/webgpu-setup-macos/16381)

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**Author:** [@Seun](https://discourse.vtk.org/u/Seun)\
**Replies:** 8\
**Last updated:** [April 17, 2026, 3:14pm UTC](https://discourse.vtk.org/t/webgpu-setup-macos/16381 "2026-04-17T15:14:38Z")

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Hello everyone, I would appreciate it if someone could help with this. I have been trying to follow the following tutorial to no avail. https://docs.vtk.org/en/latest/modules/vtk-modules/Rendering/WebGPU/README.html#conf…

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## [Models Edges](https://discourse.vtk.org/t/models-edges/16376)

<div class="topic-metadata">

**Author:** [@Xie](https://discourse.vtk.org/u/Xie)\
**Replies:** 4\
**Last updated:** [April 14, 2026, 3:03am UTC](https://discourse.vtk.org/t/models-edges/16376 "2026-04-14T03:03:42Z")

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Hi,guys. I want to generate the contour of a bone model, similar to the effect shown below. I tried using vtkFeatureEdges, but the contour it produces is not what I want（the red ）. What should I do? Tks

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## [QVTKNativeWidget: Jagged edges on 2D images](https://discourse.vtk.org/t/qvtknativewidget-jagged-edges-on-2d-images/16188)

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**Author:** [@Manjunath\_AV](https://discourse.vtk.org/u/Manjunath_AV)\
**Replies:** 15\
**Last updated:** [April 11, 2026, 4:42pm UTC](https://discourse.vtk.org/t/qvtknativewidget-jagged-edges-on-2d-images/16188 "2026-04-11T16:42:00Z")

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Hi all, I’m displaying 2D images using QVTKNativeWidget and I’m seeing zigzag/jagged edges along high-contrast boundaries. I’ve attached two screenshots: Current issue: edges look stair-stepped/pixelated Desi…

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## [License and Attribution of the VTK Logo?](https://discourse.vtk.org/t/license-and-attribution-of-the-vtk-logo/16359)

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**Author:** [@hwhsu1231](https://discourse.vtk.org/u/hwhsu1231)\
**Replies:** 2\
**Last updated:** [April 11, 2026, 10:03am UTC](https://discourse.vtk.org/t/license-and-attribution-of-the-vtk-logo/16359 "2026-04-11T10:03:26Z")

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Hello, VTK Team, To decorate the README of the vtk-docs-l10n project, I would like to place the VTK logo at the top. And I have found the VTK logo in SVG format: File:Visualization Toolkit logo.svg - Wikimedia Commons …

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## [How to get boundary edges from STL file?](https://discourse.vtk.org/t/how-to-get-boundary-edges-from-stl-file/5123)

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**Author:** [@Anastasiia](https://discourse.vtk.org/u/Anastasiia)\
**Replies:** 3\
**Last updated:** [April 9, 2026, 9:14am UTC](https://discourse.vtk.org/t/how-to-get-boundary-edges-from-stl-file/5123 "2026-04-09T09:14:46Z")

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Hi everyone, I’m trying to get boundaries from STL model. I’ve tried the following method with converting stl to vtk, it works, but maybe there’s something more convenient? mesh = meshio.Mesh.read( "motor.stl", file…

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## [Apply scalar in vtkDijkstraGraphGeodesicPath function](https://discourse.vtk.org/t/apply-scalar-in-vtkdijkstragraphgeodesicpath-function/16374)

<div class="topic-metadata">

**Author:** [@joo94372](https://discourse.vtk.org/u/joo94372)\
**Replies:** 0\
**Last updated:** [April 7, 2026, 10:38am UTC](https://discourse.vtk.org/t/apply-scalar-in-vtkdijkstragraphgeodesicpath-function/16374 "2026-04-07T10:38:00Z")

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Hello. I’m using it well to find a distance-based path for the vtkDijkstraGraphGeodesicPath function. But I want to find a path that moves close based on the desired curvature value. The VTK: vtkDijkstraGraphGeodesicPa…

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## [How to enable USD IO module build?](https://discourse.vtk.org/t/how-to-enable-usd-io-module-build/16368)

<div class="topic-metadata">

**Author:** [@Nicholas\_Yue](https://discourse.vtk.org/u/Nicholas_Yue)\
**Replies:** 3\
**Last updated:** [April 2, 2026, 10:01pm UTC](https://discourse.vtk.org/t/how-to-enable-usd-io-module-build/16368 "2026-04-02T22:01:23Z")

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I saw a message regarding USD and thought I’d give it a go. I downloaded 9.6.1, run the cmake config (no special flags) I noticed that in the build directory, USD is not configured for building. I tried grep’ping USD …

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## [which method/tool is best to check memory leak for VTK programs on Ubuntu? vtkDebugLeaks enough? or Valgrind/ASan?](https://discourse.vtk.org/t/which-method-tool-is-best-to-check-memory-leak-for-vtk-programs-on-ubuntu-vtkdebugleaks-enough-or-valgrind-asan/12461)

<div class="topic-metadata">

**Author:** [@gpu](https://discourse.vtk.org/u/gpu)\
**Replies:** 9\
**Last updated:** [April 2, 2026, 7:39pm UTC](https://discourse.vtk.org/t/which-method-tool-is-best-to-check-memory-leak-for-vtk-programs-on-ubuntu-vtkdebugleaks-enough-or-valgrind-asan/12461 "2026-04-02T19:39:56Z")

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which method/tool is best to check memory leak for VTK programs on Ubuntu? vtkDebugLeaks enough? or Valgrind/ASan? thanks

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## [CPU usage is high since V9.5.0](https://discourse.vtk.org/t/cpu-usage-is-high-since-v9-5-0/16367)

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**Author:** [@xiaohuijieao](https://discourse.vtk.org/u/xiaohuijieao)\
**Replies:** 7\
**Last updated:** [April 1, 2026, 2:50pm UTC](https://discourse.vtk.org/t/cpu-usage-is-high-since-v9-5-0/16367 "2026-04-01T14:50:45Z")

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Since upgrade from V9.1.0 to V9.5.0, we find that the CPU usage is always high in windows, not like before which is 0% in static state. So, we checked the difference, and we found the Event Loop logic changed. In file R…

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## [Moving data from VTK to ITK: issue in memory management](https://discourse.vtk.org/t/moving-data-from-vtk-to-itk-issue-in-memory-management/16363)

<div class="topic-metadata">

**Author:** [@Boris38](https://discourse.vtk.org/u/Boris38)\
**Replies:** 2\
**Last updated:** [March 30, 2026, 1:56pm UTC](https://discourse.vtk.org/t/moving-data-from-vtk-to-itk-issue-in-memory-management/16363 "2026-03-30T13:56:31Z")

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Hello everyone. I use ITK (5.4.4) and VTK (9.5.2) in my code. I use some VTK classes (like vtkImageStencil) which use some mesh (vtkPolyData) and i want the result in an ITK image. To convert result of the vtkImageSte…

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## [How to overlay a vector field on a molecule, with output to file for use in ParaView](https://discourse.vtk.org/t/how-to-overlay-a-vector-field-on-a-molecule-with-output-to-file-for-use-in-paraview/16357)

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**Author:** [@jzwanzig](https://discourse.vtk.org/u/jzwanzig)\
**Replies:** 0\
**Last updated:** [March 25, 2026, 2:10pm UTC](https://discourse.vtk.org/t/how-to-overlay-a-vector-field-on-a-molecule-with-output-to-file-for-use-in-paraview/16357 "2026-03-25T14:10:46Z")

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Hello, I am generating vector field data in an ab initio physics code, and I am able to convert it to a vtkStructuredGrid and display it nicely in ParaView; I am also able to generate a vtkMolecule and display that nicel…

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## [Improving Interaction and LOD Performance in vtkSmartVolumeMapper for Large Datasets](https://discourse.vtk.org/t/improving-interaction-and-lod-performance-in-vtksmartvolumemapper-for-large-datasets/16348)

<div class="topic-metadata">

**Author:** [@Manjunath\_AV](https://discourse.vtk.org/u/Manjunath_AV)\
**Replies:** 5\
**Last updated:** [March 25, 2026, 1:14pm UTC](https://discourse.vtk.org/t/improving-interaction-and-lod-performance-in-vtksmartvolumemapper-for-large-datasets/16348 "2026-03-25T13:14:46Z")

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I’m experiencing performance issues with vtkSmartVolumeMapper when loading around 2000 slices, even on a high‑end GPU like the NVIDIA RTX 4000 Ada. During interaction, the mapper takes noticeable time to reduce the LOD (…

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## [VTKHDF: Clarifying a distinction between MB and PDC](https://discourse.vtk.org/t/vtkhdf-clarifying-a-distinction-between-mb-and-pdc/16306)

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**Author:** [@nncarlson](https://discourse.vtk.org/u/nncarlson)\
**Replies:** 3\
**Last updated:** [March 24, 2026, 1:59pm UTC](https://discourse.vtk.org/t/vtkhdf-clarifying-a-distinction-between-mb-and-pdc/16306 "2026-03-24T13:59:55Z")

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When describing the difference between MB and PDC datasets, the 2.6 spec says: “For PDC, a group in the assembly that is \[…\] a softlink represents a dataset index associated to its parent node.” I don’t understand wh…

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## [Purpose of UnstructuredGrid partitioning in VTKHDF](https://discourse.vtk.org/t/purpose-of-unstructuredgrid-partitioning-in-vtkhdf/13556)

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**Author:** [@nncarlson](https://discourse.vtk.org/u/nncarlson)\
**Replies:** 9\
**Last updated:** [March 23, 2026, 2:12pm UTC](https://discourse.vtk.org/t/purpose-of-unstructuredgrid-partitioning-in-vtkhdf/13556 "2026-03-23T14:12:24Z")

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I’m exploring using VTKHDF export as a replacement for our code’s unsupported VTK reader. So far I’ve managed to successfully generate a vtkhdf file with an example UnstructuredGrid mesh and point and cell data that disp…

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## [No interaction for vtkCameraOrientationWidget in QtQuick](https://discourse.vtk.org/t/no-interaction-for-vtkcameraorientationwidget-in-qtquick/7161)

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**Author:** [@Cameron](https://discourse.vtk.org/u/Cameron)\
**Replies:** 16\
**Last updated:** [March 23, 2026, 9:03am UTC](https://discourse.vtk.org/t/no-interaction-for-vtkcameraorientationwidget-in-qtquick/7161 "2026-03-23T09:03:26Z")

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I am developing a 3D application based on VTK and QtQuick. I am trying to use vtkCameraOrientationWidget and followed example here (https://kitware.github.io/vtk-examples/site/Cxx/PolyData/Curvatures/). To use vtkCameraO…

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## [vtkSmartVolumeMapper GPU path → OpenGL error 1280 (Invalid enum) in vtkOpenGLProperty after first Render](https://discourse.vtk.org/t/vtksmartvolumemapper-gpu-path-opengl-error-1280-invalid-enum-in-vtkopenglproperty-after-first-render/16349)

<div class="topic-metadata">

**Author:** [@Manjunath\_AV](https://discourse.vtk.org/u/Manjunath_AV)\
**Replies:** 0\
**Last updated:** [March 21, 2026, 5:45pm UTC](https://discourse.vtk.org/t/vtksmartvolumemapper-gpu-path-opengl-error-1280-invalid-enum-in-vtkopenglproperty-after-first-render/16349 "2026-03-21T17:45:51Z")

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I’m seeing an OpenGL error when trying to render a volume with vtkSmartVolumeMapper (GPU mapper). The first render triggers: ERR: vtkLogForwarder.cpp(13): ERROR: In vtkOpenGLProperty.cxx, line 59 vtkOpenGLProperty (0x00…

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## [Python error vtkXOpenGLRenderWindow Could not find a decent config](https://discourse.vtk.org/t/python-error-vtkxopenglrenderwindow-could-not-find-a-decent-config/15992)

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**Author:** [@marpoleSim](https://discourse.vtk.org/u/marpoleSim)\
**Replies:** 9\
**Last updated:** [March 19, 2026, 12:01pm UTC](https://discourse.vtk.org/t/python-error-vtkxopenglrenderwindow-could-not-find-a-decent-config/15992 "2026-03-19T12:01:39Z")

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This is the first time I use python to run vtk. I got the following errors when the code ran to the following line. renderWindow = vtkRenderWindow() The error message is, 2025-08-22 11:11:25.167 ( 0.546s) \[ 75B0D…

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## [QVTKOpenglNativeWidget resizing issue with QmainWindow](https://discourse.vtk.org/t/qvtkopenglnativewidget-resizing-issue-with-qmainwindow/16336)

<div class="topic-metadata">

**Author:** [@Mesbah](https://discourse.vtk.org/u/Mesbah)\
**Replies:** 1\
**Last updated:** [March 17, 2026, 8:28pm UTC](https://discourse.vtk.org/t/qvtkopenglnativewidget-resizing-issue-with-qmainwindow/16336 "2026-03-17T20:28:03Z")

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Hi, My goal is to use vtk to render different TPMS structure for bone scaffolding. Initially I am trying to render just a simple cylinder to get the GUI layout correct so I can add the buttons and sliders later to get t…

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## [vtkDICOMImageReader & GDCM DICOM : JPEG 2000 lossless](https://discourse.vtk.org/t/vtkdicomimagereader-gdcm-dicom-jpeg-2000-lossless/16335)

<div class="topic-metadata">

**Author:** [@Anand72](https://discourse.vtk.org/u/Anand72)\
**Replies:** 1\
**Last updated:** [March 17, 2026, 12:52pm UTC](https://discourse.vtk.org/t/vtkdicomimagereader-gdcm-dicom-jpeg-2000-lossless/16335 "2026-03-17T12:52:27Z")

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vtkDICOMImageReader : Unable to get PixelData from stream which has TransferSyntaxUID=1.2.840.10008.1.2.4.90 (JPEG 2000 lossless). I get above error , I have compiled vtk with GDCM which is suppose to handle JPEG 2000 ? …

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## [Localization of VTK Documentation](https://discourse.vtk.org/t/localization-of-vtk-documentation/16328)

<div class="topic-metadata">

**Author:** [@hwhsu1231](https://discourse.vtk.org/u/hwhsu1231)\
**Replies:** 0\
**Last updated:** [March 16, 2026, 3:49am UTC](https://discourse.vtk.org/t/localization-of-vtk-documentation/16328 "2026-03-16T03:49:47Z")

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Announcement Hello, VTK community, I am the author of the Localize The Docs organization. And I’m glad to announce that the :tada: vtk-docs-l10n :tada: project is published now: :rocket: Preview: vtk-docs-l10n …

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## [Linking errors Building VTK with dcmtk](https://discourse.vtk.org/t/linking-errors-building-vtk-with-dcmtk/16327)

<div class="topic-metadata">

**Author:** [@Anand72](https://discourse.vtk.org/u/Anand72)\
**Replies:** 2\
**Last updated:** [March 16, 2026, 2:27am UTC](https://discourse.vtk.org/t/linking-errors-building-vtk-with-dcmtk/16327 "2026-03-16T02:27:53Z")

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I am trying to build vtk using cmake on Windows 11 with following cmake options Commandline options: -DCMAKE\_CXX\_MP\_NUM\_PROCESSORS:STRING=“16” -DCXX\_STANDARD:STRING=“17” -DNSIS\_EXECUTABLE:FILEPATH=“NSIS\_EXECUTABLE-NOTF…

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## [libVTKIO not found](https://discourse.vtk.org/t/libvtkio-not-found/16316)

<div class="topic-metadata">

**Author:** [@jsandhu](https://discourse.vtk.org/u/jsandhu)\
**Replies:** 3\
**Last updated:** [March 13, 2026, 3:03am UTC](https://discourse.vtk.org/t/libvtkio-not-found/16316 "2026-03-13T03:03:18Z")

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I inherited some C++ code that uses VTK. I’m on macOS Sequoia 15.7.4. I installed VTK via homebrew. I can see the install in /usr/local/cellar/vtk/9.5.2\_3. The makefile uses -lvtkIO -lvtkCommon -lvtkFiltering … (among …

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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)

<div class="topic-metadata">

**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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