# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=11

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

**Page:** 12

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## [VTK/WASM: Push client camera state to server (i.e. update server camera to match the client camera)](https://discourse.vtk.org/t/vtk-wasm-push-client-camera-state-to-server-i-e-update-server-camera-to-match-the-client-camera/15444)

<div class="topic-metadata">

**Author:** [@uv382](https://discourse.vtk.org/u/uv382)\
**Replies:** 1\
**Last updated:** [March 31, 2025, 3:23am UTC](https://discourse.vtk.org/t/vtk-wasm-push-client-camera-state-to-server-i-e-update-server-camera-to-match-the-client-camera/15444 "2025-03-31T03:23:48Z")

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@jaswantp Hi Jaswant, I know we spoke about this earlier but I forgot to ask specifically how it’s done. In VTK/WASM, the active camera on the server does not stay synchronized with the active camera on the frontend unl…

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## [Control vtkCubeAxesActor ticks spacing](https://discourse.vtk.org/t/control-vtkcubeaxesactor-ticks-spacing/15430)

<div class="topic-metadata">

**Author:** [@Julien\_Champagnol](https://discourse.vtk.org/u/Julien_Champagnol)\
**Replies:** 1\
**Last updated:** [March 28, 2025, 5:52pm UTC](https://discourse.vtk.org/t/control-vtkcubeaxesactor-ticks-spacing/15430 "2025-03-28T17:52:08Z")

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Hi, Is there a way to control the ticks/grid spacing of a vtkCubeAxesActor in Python? This is done in paraview, and I would like to know how it could be done in vtk. Thanks Julien

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## [Examples of writing movies with VTK?](https://discourse.vtk.org/t/examples-of-writing-movies-with-vtk/15438)

<div class="topic-metadata">

**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 1\
**Last updated:** [March 28, 2025, 2:52pm UTC](https://discourse.vtk.org/t/examples-of-writing-movies-with-vtk/15438 "2025-03-28T14:52:07Z")

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I have a sequence of vtkXMLPolydata files that have temperature data in them. I can render them just fine, but what I’d really like to be able to do is to set up my camera to generate screenshots of the time series, or t…

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## [Low frame rate when adjusting window/level at the beginning of 2D rendering](https://discourse.vtk.org/t/low-frame-rate-when-adjusting-window-level-at-the-beginning-of-2d-rendering/15436)

<div class="topic-metadata">

**Author:** [@St\_Lee](https://discourse.vtk.org/u/St_Lee)\
**Replies:** 0\
**Last updated:** [March 27, 2025, 8:41am UTC](https://discourse.vtk.org/t/low-frame-rate-when-adjusting-window-level-at-the-beginning-of-2d-rendering/15436 "2025-03-27T08:41:15Z")

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Hi everyone, I’m a beginner with VTK. I wrote a simple program to display a 2D CT slice using vtkImageActor. The image displays correctly, and the window/level adjustment works fine visually. However, I noticed a strang…

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## [partially reading vtkMultiBlockDataSet](https://discourse.vtk.org/t/partially-reading-vtkmultiblockdataset/9251)

<div class="topic-metadata">

**Author:** [@philippeseil](https://discourse.vtk.org/u/philippeseil)\
**Replies:** 4\
**Last updated:** [March 27, 2025, 7:18am UTC](https://discourse.vtk.org/t/partially-reading-vtkmultiblockdataset/9251 "2025-03-27T07:18:23Z")

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Hi all, I am working on an application where I have to read many (potentially large) vtkMultiBlockDataSet, but only use parts of the data stored in those data sets. Thus, I am looking for a way to only selectively load …

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## [Using an offscreen renderer influences completely separate interactive renderer](https://discourse.vtk.org/t/using-an-offscreen-renderer-influences-completely-separate-interactive-renderer/15336)

<div class="topic-metadata">

**Author:** [@rdbrn](https://discourse.vtk.org/u/rdbrn)\
**Replies:** 10\
**Last updated:** [March 26, 2025, 10:00am UTC](https://discourse.vtk.org/t/using-an-offscreen-renderer-influences-completely-separate-interactive-renderer/15336 "2025-03-26T10:00:59Z")

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I have a qt application with an interactive viewport displaying a model. The user can save a screenshot of the model to a file. This is done by creating a new renderer, render window, camera and actors and then capturi…

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## [2D projection from 3D volume with variable source distance](https://discourse.vtk.org/t/2d-projection-from-3d-volume-with-variable-source-distance/15429)

<div class="topic-metadata">

**Author:** [@bdeldri](https://discourse.vtk.org/u/bdeldri)\
**Replies:** 0\
**Last updated:** [March 25, 2025, 8:32pm UTC](https://discourse.vtk.org/t/2d-projection-from-3d-volume-with-variable-source-distance/15429 "2025-03-25T20:32:17Z")

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I am new to VTK in general, and am struggling to find the right place to change the projection parameter that I want. I am trying to generate a 2D projection of a volume from a particular viewpoint, and have based my ex…

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## [In VtkGLTF\_importer I am getting the hierarchy. However while exporting glb file using gltf\_exporter it getting lost. Please help me in this.](https://discourse.vtk.org/t/in-vtkgltf-importer-i-am-getting-the-hierarchy-however-while-exporting-glb-file-using-gltf-exporter-it-getting-lost-please-help-me-in-this/15421)

<div class="topic-metadata">

**Author:** [@shruti](https://discourse.vtk.org/u/shruti)\
**Replies:** 2\
**Last updated:** [March 25, 2025, 12:22pm UTC](https://discourse.vtk.org/t/in-vtkgltf-importer-i-am-getting-the-hierarchy-however-while-exporting-glb-file-using-gltf-exporter-it-getting-lost-please-help-me-in-this/15421 "2025-03-25T12:22:19Z")

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In glb file multiple texture and hierarchy is not coming.

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## [Unable to find a valid OpenGL 3.2 or later implementation. Please update your video card driver to the latest version.](https://discourse.vtk.org/t/unable-to-find-a-valid-opengl-3-2-or-later-implementation-please-update-your-video-card-driver-to-the-latest-version/15425)

<div class="topic-metadata">

**Author:** [@xiang](https://discourse.vtk.org/u/xiang)\
**Replies:** 0\
**Last updated:** [March 25, 2025, 5:41am UTC](https://discourse.vtk.org/t/unable-to-find-a-valid-opengl-3-2-or-later-implementation-please-update-your-video-card-driver-to-the-latest-version/15425 "2025-03-25T05:41:19Z")

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python: why i create four QVTKRenderWindowInteractor(self) in pyqt6 ,when closing pyqt6 interface， it will show ERR| vtkWin32OpenGLRenderWindow (0000016F71420F20): failed to get valid pixel format. 2025-03-19 00:46:41…

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## [Cannot wrapping module for python](https://discourse.vtk.org/t/cannot-wrapping-module-for-python/15281)

<div class="topic-metadata">

**Author:** [@Mat\_F](https://discourse.vtk.org/u/Mat_F)\
**Replies:** 10\
**Last updated:** [March 24, 2025, 9:28am UTC](https://discourse.vtk.org/t/cannot-wrapping-module-for-python/15281 "2025-03-24T09:28:27Z")

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Hi all, as I early mentioned on title, I’m trouble with the wrapping of custom classes to python. I had search for long time but i didnt found nothing to solve my case. Below all steps to reproduce the error: git clo…

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## [Can flat indices from CompositeDataSetIterators be used to recover nodes from vtkDataAssembly?](https://discourse.vtk.org/t/can-flat-indices-from-compositedatasetiterators-be-used-to-recover-nodes-from-vtkdataassembly/15410)

<div class="topic-metadata">

**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 1\
**Last updated:** [March 21, 2025, 8:23pm UTC](https://discourse.vtk.org/t/can-flat-indices-from-compositedatasetiterators-be-used-to-recover-nodes-from-vtkdataassembly/15410 "2025-03-21T20:23:53Z")

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Hello!!! I’m uinsg VTK 9.2, Python 3.11.6 and I’ll be grateful for any help with this… I have a vtkPartitionedDataSetCollection and associated vtkDataAssembly representing a hierarchial Part/Assembly structure. I have …

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## [Transparency Aliasing Issue going from VTK8 to 9](https://discourse.vtk.org/t/transparency-aliasing-issue-going-from-vtk8-to-9/15398)

<div class="topic-metadata">

**Author:** [@TravStu22](https://discourse.vtk.org/u/TravStu22)\
**Replies:** 9\
**Last updated:** [March 20, 2025, 5:46pm UTC](https://discourse.vtk.org/t/transparency-aliasing-issue-going-from-vtk8-to-9/15398 "2025-03-20T17:46:15Z")

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Hello. It looks like setting a non-one opacity value disables the hardware anti-aliasing in VTK9. (v9.4.1) The left triangle is opaque while the right is a transparent. Note the jaggies. Here is the same code in v8.…

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## [vtkCellLocator::GetCell returning negative weights](https://discourse.vtk.org/t/vtkcelllocator-getcell-returning-negative-weights/15406)

<div class="topic-metadata">

**Author:** [@Anna](https://discourse.vtk.org/u/Anna)\
**Replies:** 0\
**Last updated:** [March 19, 2025, 6:34pm UTC](https://discourse.vtk.org/t/vtkcelllocator-getcell-returning-negative-weights/15406 "2025-03-19T18:34:22Z")

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Hello, I am working in a vtkUnstructuredGrid containing Wedges and Hexaedrons and want to interpolate a field to a point inside this region. To do this I use the vtkCellLocator::GetCell funciton and calculate my interp…

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## [Cmake cannot locate VTK, VTK installation incomplete, VTK and paraview conflict](https://discourse.vtk.org/t/cmake-cannot-locate-vtk-vtk-installation-incomplete-vtk-and-paraview-conflict/15402)

<div class="topic-metadata">

**Author:** [@AP76](https://discourse.vtk.org/u/AP76)\
**Replies:** 1\
**Last updated:** [March 19, 2025, 12:11pm UTC](https://discourse.vtk.org/t/cmake-cannot-locate-vtk-vtk-installation-incomplete-vtk-and-paraview-conflict/15402 "2025-03-19T12:11:34Z")

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Dear all, I’m currently using debian distribution. I encounter an issue when running cmake with a preset using cmake --preset release. I proceed to the build configuration step. However, when configuring with a preset, …

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## [cmake warnings related to PlatformGraphicsConfig.cmake](https://discourse.vtk.org/t/cmake-warnings-related-to-platformgraphicsconfig-cmake/15386)

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**Author:** [@amkovt](https://discourse.vtk.org/u/amkovt)\
**Replies:** 2\
**Last updated:** [March 18, 2025, 1:09pm UTC](https://discourse.vtk.org/t/cmake-warnings-related-to-platformgraphicsconfig-cmake/15386 "2025-03-18T13:09:58Z")

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Hello, I am building VTK 9.2.2 with Qt 6.8.1. And I am getting the following CMake warnings related to PlatformGraphicsConfig.cmake. I tried the following flags, but it did not fix the warnings. -DVTK\_OPENGL\_HAS\_EGL=O…

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## [Setting a Scale/ruler while Zooming or moving the vtkresliceimageviewer data](https://discourse.vtk.org/t/setting-a-scale-ruler-while-zooming-or-moving-the-vtkresliceimageviewer-data/14831)

<div class="topic-metadata">

**Author:** [@christeen](https://discourse.vtk.org/u/christeen)\
**Replies:** 7\
**Last updated:** [March 17, 2025, 9:07pm UTC](https://discourse.vtk.org/t/setting-a-scale-ruler-while-zooming-or-moving-the-vtkresliceimageviewer-data/14831 "2025-03-17T21:07:11Z")

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I am currently working on introducing a scale or ruler feature in VTK within a vtkResliceImageViewer. My goal is for the scale to dynamically update as I zoom in or move the data in the viewer, reflecting the current pos…

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## [ADIOS2VTXReader in vtk Python](https://discourse.vtk.org/t/adios2vtxreader-in-vtk-python/15384)

<div class="topic-metadata">

**Author:** [@jorgensd](https://discourse.vtk.org/u/jorgensd)\
**Replies:** 6\
**Last updated:** [March 17, 2025, 12:37pm UTC](https://discourse.vtk.org/t/adios2vtxreader-in-vtk-python/15384 "2025-03-17T12:37:35Z")

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Hi everyone, Is there a way of reading VTX files from ADIOS2 in the VTK Python-API? As far as I can tell, it is only possible in the C++ interface (https://gitlab.kitware.com/search?group\_id=16&project\_id=13&repository…

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## [How to paint cells around a point according to the point's value in different cells?](https://discourse.vtk.org/t/how-to-paint-cells-around-a-point-according-to-the-points-value-in-different-cells/12884)

<div class="topic-metadata">

**Author:** [@Danyuhui](https://discourse.vtk.org/u/Danyuhui)\
**Replies:** 3\
**Last updated:** [March 15, 2025, 9:50pm UTC](https://discourse.vtk.org/t/how-to-paint-cells-around-a-point-according-to-the-points-value-in-different-cells/12884 "2025-03-15T21:50:13Z")

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I want to using vtk to paint my grid as follows like the point in white.It belongs to four cells:1/2/3/4.When it belongs to cel1/2,its value should be like 3(3 maps blue in lookup table).And When it belongs to cell 3…

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## [Why vtkImageTracerWidget doesn't work](https://discourse.vtk.org/t/why-vtkimagetracerwidget-doesnt-work/12137)

<div class="topic-metadata">

**Author:** [@mmXIO](https://discourse.vtk.org/u/mmXIO)\
**Replies:** 5\
**Last updated:** [March 15, 2025, 9:47pm UTC](https://discourse.vtk.org/t/why-vtkimagetracerwidget-doesnt-work/12137 "2025-03-15T21:47:33Z")

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Why vtkImageTracerWidget doesn’t work？ import vtk reader=vtk.vtkDICOMImageReader() reader.SetDirectoryName("DicomData/16") reader.Update() view=vtk.vtkImageViewer2() view.SetInputConnection(reader.GetOutputPort()) in…

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## [vtk module with JAVA wrapping](https://discourse.vtk.org/t/vtk-module-with-java-wrapping/15391)

<div class="topic-metadata">

**Author:** [@metamurk](https://discourse.vtk.org/u/metamurk)\
**Replies:** 1\
**Last updated:** [March 14, 2025, 5:43pm UTC](https://discourse.vtk.org/t/vtk-module-with-java-wrapping/15391 "2025-03-14T17:43:15Z")

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Hello together, We are working on migrating our code from vtk 7 to vtk 9.4.1. We use the java wrapping functionality. In the actual version, there is in “Examples\\Build\\vtkMy” an example how to build a custom module. In…

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## [Make edges of elements visible when viewed by side](https://discourse.vtk.org/t/make-edges-of-elements-visible-when-viewed-by-side/9339)

<div class="topic-metadata">

**Author:** [@Flagada](https://discourse.vtk.org/u/Flagada)\
**Replies:** 6\
**Last updated:** [March 13, 2025, 9:22pm UTC](https://discourse.vtk.org/t/make-edges-of-elements-visible-when-viewed-by-side/9339 "2025-03-13T21:22:26Z")

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Hi all! I have recently noticed that when plate elements are exactly viewed from the side, the elements are no more visible, even if the vtkActor property have EdgeVisibilityOn(). Here is an example of what I say and w…

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## [Clip plane works in remote but not in local](https://discourse.vtk.org/t/clip-plane-works-in-remote-but-not-in-local/15389)

<div class="topic-metadata">

**Author:** [@Gaston\_Avto](https://discourse.vtk.org/u/Gaston_Avto)\
**Replies:** 0\
**Last updated:** [March 13, 2025, 8:41pm UTC](https://discourse.vtk.org/t/clip-plane-works-in-remote-but-not-in-local/15389 "2025-03-13T20:41:44Z")

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Hi! I am trying to have a clip plane in a vtkVolume. The weird thing is that clipping the volume in RemoteView works completely as expected using my slider. I can scroll through and works perfectly. It is only when I tr…

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## [vtkPNGReader does not read png files as grayscale](https://discourse.vtk.org/t/vtkpngreader-does-not-read-png-files-as-grayscale/15370)

<div class="topic-metadata">

**Author:** [@inferna15](https://discourse.vtk.org/u/inferna15)\
**Replies:** 7\
**Last updated:** [March 13, 2025, 6:59pm UTC](https://discourse.vtk.org/t/vtkpngreader-does-not-read-png-files-as-grayscale/15370 "2025-03-13T18:59:11Z")

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I want to visualize PNG files in a directory using volume rendering, but the vtkColorTransferFunction and vtkPiecewiseFunction classes did not work with vtkVolumeProperty. As far as I understand, this issue arises becaus…

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## [vtkPExodusIIReader gives no outputs](https://discourse.vtk.org/t/vtkpexodusiireader-gives-no-outputs/15373)

<div class="topic-metadata">

**Author:** [@mattfalcone](https://discourse.vtk.org/u/mattfalcone)\
**Replies:** 0\
**Last updated:** [March 12, 2025, 7:35pm UTC](https://discourse.vtk.org/t/vtkpexodusiireader-gives-no-outputs/15373 "2025-03-12T19:35:56Z")

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I am trying to read the can.e.4.\* Parallel Exodus II files in the VTKData tar ball using the vtkPExodusIIReader. It seems that the reader recognises which files needs to be read and returns without error. However, the re…

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## [Extracted Surface Region (VTK) – Need Guidance on Smoothing & Cutting (VTK)](https://discourse.vtk.org/t/extracted-surface-region-vtk-need-guidance-on-smoothing-cutting-vtk/15306)

<div class="topic-metadata">

**Author:** [@christeen](https://discourse.vtk.org/u/christeen)\
**Replies:** 2\
**Last updated:** [March 11, 2025, 9:26am UTC](https://discourse.vtk.org/t/extracted-surface-region-vtk-need-guidance-on-smoothing-cutting-vtk/15306 "2025-03-11T09:26:20Z")

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Hi Everyone, I’m new to VTK, and I’m currently working on a project that involves surface region extraction, smoothing, and precise cutting. Current Progress: I have extracted the surface region from an STL file using…

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## [Trying to make a temporal vtkhdf polydata using Python](https://discourse.vtk.org/t/trying-to-make-a-temporal-vtkhdf-polydata-using-python/15298)

<div class="topic-metadata">

**Author:** [@Ahmed\_Salih](https://discourse.vtk.org/u/Ahmed_Salih)\
**Replies:** 10\
**Last updated:** [March 11, 2025, 9:22am UTC](https://discourse.vtk.org/t/trying-to-make-a-temporal-vtkhdf-polydata-using-python/15298 "2025-03-11T09:22:08Z")

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Hello! I am about to lose my mind (exaggeration) in regards to how to properly make a temporal polydata dataset. I have found: https://www.kitware.com/how-to-write-time-dependent-data-in-vtkhdf-files/ But it is way to…

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## [multiple inheritance in VTK 9.4.1 for Python?](https://discourse.vtk.org/t/multiple-inheritance-in-vtk-9-4-1-for-python/15358)

<div class="topic-metadata">

**Author:** [@bistek](https://discourse.vtk.org/u/bistek)\
**Replies:** 7\
**Last updated:** [March 10, 2025, 10:57pm UTC](https://discourse.vtk.org/t/multiple-inheritance-in-vtk-9-4-1-for-python/15358 "2025-03-10T22:57:11Z")

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Hello, I’m getting an unexpected error in a VTK Python project. Basically I have a class that is derived from vtkPolyData and another custom-built class with multiple inheritance. It was working flawlessly up to VTK 9.…

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## [Python-Created HyperTreeGrid File Performance on Paraview](https://discourse.vtk.org/t/python-created-hypertreegrid-file-performance-on-paraview/15329)

<div class="topic-metadata">

**Author:** [@Nicolas](https://discourse.vtk.org/u/Nicolas)\
**Replies:** 1\
**Last updated:** [March 9, 2025, 9:26am UTC](https://discourse.vtk.org/t/python-created-hypertreegrid-file-performance-on-paraview/15329 "2025-03-09T09:26:16Z")

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Hi, I am converting TreeBased-AMR CFD simulation data into VTK HyperTreeGrid using a python script similar the one of this tutorial (simplified script version at the end). The created htg file from relatively large dat…

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## [Building VTK 9.4.1 with Qt 6.8.1 with Qt Quick Support](https://discourse.vtk.org/t/building-vtk-9-4-1-with-qt-6-8-1-with-qt-quick-support/15356)

<div class="topic-metadata">

**Author:** [@amkovt](https://discourse.vtk.org/u/amkovt)\
**Replies:** 4\
**Last updated:** [March 8, 2025, 9:24pm UTC](https://discourse.vtk.org/t/building-vtk-9-4-1-with-qt-6-8-1-with-qt-quick-support/15356 "2025-03-08T21:24:34Z")

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Hi, I am trying to build VTK 9.4.1 with Qt version 6.8.1 and enable Qt Quick support in the VTK build configuration. However, I’ve not been able to build it because VTK is looking for a qmlplugindump executable that was…

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## [VTK9.1: vtkAppendPolyData::Update() takes too long](https://discourse.vtk.org/t/vtk9-1-vtkappendpolydata-update-takes-too-long/15352)

<div class="topic-metadata">

**Author:** [@imax10000](https://discourse.vtk.org/u/imax10000)\
**Replies:** 2\
**Last updated:** [March 7, 2025, 10:47pm UTC](https://discourse.vtk.org/t/vtk9-1-vtkappendpolydata-update-takes-too-long/15352 "2025-03-07T22:47:30Z")

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Hello, I’m new to VTK and am trying to create a landscape of cuboids with the height of each cuboid specified in a matrix. For that I use mainly the classes vtkCubeSource and vtkAppendPolyData: void create\_preview(cons…

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