# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=24

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

**Page:** 25

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## [Raspberry PI5 + Python + VTK](https://discourse.vtk.org/t/raspberry-pi5-python-vtk/13984)

<div class="topic-metadata">

**Author:** [@shineworld](https://discourse.vtk.org/u/shineworld)\
**Replies:** 3\
**Last updated:** [June 6, 2024, 3:12pm UTC](https://discourse.vtk.org/t/raspberry-pi5-python-vtk/13984 "2024-06-06T15:12:35Z")

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I’m not able to find a VTK Python package for Raspberry Pi 5 (Python 3.11.2). How to install it ? There is some pre-made package and instructions to install it ? PS: I’ve tried to make VTK from the vtk repository in …

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## [What does "//VTK::Light::Impl" mean?](https://discourse.vtk.org/t/what-does-vtk-impl-mean/13995)

<div class="topic-metadata">

**Author:** [@shawn](https://discourse.vtk.org/u/shawn)\
**Replies:** 3\
**Last updated:** [June 6, 2024, 2:42pm UTC](https://discourse.vtk.org/t/what-does-vtk-impl-mean/13995 "2024-06-06T14:42:26Z")

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Hey all, Sorry if this is a really simple question, I am working with Paraview (Paraview uses the VTK toolkit) and attempting to do a replacement shader, currently my code looks like this { "type": "fragment", "ori…

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## [Shaders not working on vtkLODActor?](https://discourse.vtk.org/t/shaders-not-working-on-vtklodactor/6253)

<div class="topic-metadata">

**Author:** [@geoffw](https://discourse.vtk.org/u/geoffw)\
**Replies:** 3\
**Last updated:** [June 6, 2024, 3:36am UTC](https://discourse.vtk.org/t/shaders-not-working-on-vtklodactor/6253 "2024-06-06T03:36:01Z")

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Hi, We are attempting to improve performance by replacing vtkActor with vtkLODActor (or vtkQuadricLODActor) Our first naive attempt was to just change the actor type, The result was that level of detail worked, but the …

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## [vtkRenderWindowInteractor GetPointersDownCount() is always 0 for multitouch](https://discourse.vtk.org/t/vtkrenderwindowinteractor-getpointersdowncount-is-always-0-for-multitouch/13981)

<div class="topic-metadata">

**Author:** [@Blake\_Xi](https://discourse.vtk.org/u/Blake_Xi)\
**Replies:** 0\
**Last updated:** [June 4, 2024, 3:21pm UTC](https://discourse.vtk.org/t/vtkrenderwindowinteractor-getpointersdowncount-is-always-0-for-multitouch/13981 "2024-06-04T15:21:44Z")

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Hi, I’m trying to pass qt5 touch event (QTouchEvent) to vtkRenderWindowInteractor. I loop over all touchs points and send x,y, pointerIndex as event information to the interactor. I send the command correspondingly like…

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## [is it able to cut a pipe by given a circle vertices on it, by SelectPolyData/ImplicitSelectionLoop?ERROR:Can't follow egde. Set EdgeSearchMode to Dijkstra.](https://discourse.vtk.org/t/is-it-able-to-cut-a-pipe-by-given-a-circle-vertices-on-it-by-selectpolydata-implicitselectionloop-error-cant-follow-egde-set-edgesearchmode-to-dijkstra/13894)

<div class="topic-metadata">

**Author:** [@gpu](https://discourse.vtk.org/u/gpu)\
**Replies:** 14\
**Last updated:** [June 3, 2024, 12:25pm UTC](https://discourse.vtk.org/t/is-it-able-to-cut-a-pipe-by-given-a-circle-vertices-on-it-by-selectpolydata-implicitselectionloop-error-cant-follow-egde-set-edgesearchmode-to-dijkstra/13894 "2024-06-03T12:25:48Z")

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is it able to cut a pipe by given a circle vertices on it, by SelectPolyData/ImplicitSelectionLoop? test and get ERROR:Can’t follow egde. Set EdgeSearchMode to Dijkstra to avoid this error. Thanks!

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## [Error in parallel unstructured VTKHDF file](https://discourse.vtk.org/t/error-in-parallel-unstructured-vtkhdf-file/13961)

<div class="topic-metadata">

**Author:** [@sori](https://discourse.vtk.org/u/sori)\
**Replies:** 3\
**Last updated:** [June 3, 2024, 6:39am UTC](https://discourse.vtk.org/t/error-in-parallel-unstructured-vtkhdf-file/13961 "2024-06-03T06:39:09Z")

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Hello, I’m trying to make my own parallel VTKHDF writing routine. For the serial execution, the output file looks fine and it could be opened well through Paraview. However, for the parallel run, the mesh doesn’t show…

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## [Issue with the latest AMD Radeon Driver](https://discourse.vtk.org/t/issue-with-the-latest-amd-radeon-driver/11942)

<div class="topic-metadata">

**Author:** [@MarKara](https://discourse.vtk.org/u/MarKara)\
**Replies:** 9\
**Last updated:** [June 2, 2024, 12:23am UTC](https://discourse.vtk.org/t/issue-with-the-latest-amd-radeon-driver/11942 "2024-06-02T00:23:43Z")

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Hi After windows update installed the latest AMD Radeon Driver for my Radeon Pro W5500 graphic card my renderer went all black, so I needed to roll back my driver to the older version. Anyone have an idea how to resol…

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## [floating point comparison in vtkImplicitSelectionLoop](https://discourse.vtk.org/t/floating-point-comparison-in-vtkimplicitselectionloop/13958)

<div class="topic-metadata">

**Author:** [@liuzhongshu](https://discourse.vtk.org/u/liuzhongshu)\
**Replies:** 0\
**Last updated:** [May 30, 2024, 5:24am UTC](https://discourse.vtk.org/t/floating-point-comparison-in-vtkimplicitselectionloop/13958 "2024-05-30T05:24:17Z")

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In vtkImplicitSelectionLoop::EvaluateFunction， there is a comparison: if (xProj\[0\] \>= this-\>Bounds\[0\] && xProj\[0\] \<= this-\>Bounds\[1\] && xProj\[1\] \>= this-\>Bounds\[2\] && xProj\[1\] \<= this-\>Bounds\[3\] && xProj\[2\] \>= this-\>…

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## [vtkImageFourierCenter behaves differently from np.fft.fftshift ?](https://discourse.vtk.org/t/vtkimagefouriercenter-behaves-differently-from-np-fft-fftshift/13957)

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**Author:** [@martin.genet](https://discourse.vtk.org/u/martin.genet)\
**Replies:** 1\
**Last updated:** [May 29, 2024, 10:06pm UTC](https://discourse.vtk.org/t/vtkimagefouriercenter-behaves-differently-from-np-fft-fftshift/13957 "2024-05-29T22:06:24Z")

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Dear all: I am confused with vtkImageFourierCenter, which seems to behave quite differently from numpy’s fftshift. Consider the following simple example: import numpy as np import vtk import vtk.numpy\_interface.dataset…

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## [vtk image sampling behavior changes?](https://discourse.vtk.org/t/vtk-image-sampling-behavior-changes/13891)

<div class="topic-metadata">

**Author:** [@lindad](https://discourse.vtk.org/u/lindad)\
**Replies:** 13\
**Last updated:** [May 29, 2024, 6:50pm UTC](https://discourse.vtk.org/t/vtk-image-sampling-behavior-changes/13891 "2024-05-29T18:50:56Z")

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We are trying to update our VTK version used in MOOSE from 9.2.6 to 9.3.0. (We are often limited in our version choices by interactions of conda feedstocks involving mpi, clang, etc.). That attempted update is occurring …

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## [compiling vtk 9.3.0 on cmake/vs: build error encountered](https://discourse.vtk.org/t/compiling-vtk-9-3-0-on-cmake-vs-build-error-encountered/13950)

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**Author:** [@nerezw](https://discourse.vtk.org/u/nerezw)\
**Replies:** 0\
**Last updated:** [May 28, 2024, 7:17am UTC](https://discourse.vtk.org/t/compiling-vtk-9-3-0-on-cmake-vs-build-error-encountered/13950 "2024-05-28T07:17:39Z")

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I am a very occasional developer. I develop in java as a hobby. I have been battling to upgrade to vtk 9.3.0. msvs 22 throws up error below. I have not been able to find the missing code or the cmake/vs setting to fix i…

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## [How to save temporal dataset?](https://discourse.vtk.org/t/how-to-save-temporal-dataset/9535)

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**Author:** [@altair0985](https://discourse.vtk.org/u/altair0985)\
**Replies:** 4\
**Last updated:** [May 28, 2024, 5:38am UTC](https://discourse.vtk.org/t/how-to-save-temporal-dataset/9535 "2024-05-28T05:38:21Z")

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I find the vtkTemporalDataSet, but it has been abandoned, which class should I use? Thank you very much.

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## [How to deal with large arrays in a parallel coordinates chart](https://discourse.vtk.org/t/how-to-deal-with-large-arrays-in-a-parallel-coordinates-chart/13925)

<div class="topic-metadata">

**Author:** [@ravelite](https://discourse.vtk.org/u/ravelite)\
**Replies:** 5\
**Last updated:** [May 27, 2024, 6:33pm UTC](https://discourse.vtk.org/t/how-to-deal-with-large-arrays-in-a-parallel-coordinates-chart/13925 "2024-05-27T18:33:54Z")

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Greetings, I’m wondering which strategies exist for dealing with vtkTable objects with many rows for parallel coordinates charts? The following example will run on my computer, with the smaller data file with 1K rows. …

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## [ProbeFilter and Tolerance](https://discourse.vtk.org/t/probefilter-and-tolerance/13945)

<div class="topic-metadata">

**Author:** [@martin.genet](https://discourse.vtk.org/u/martin.genet)\
**Replies:** 0\
**Last updated:** [May 27, 2024, 11:52am UTC](https://discourse.vtk.org/t/probefilter-and-tolerance/13945 "2024-05-27T11:52:00Z")

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Hello, I am confused at how the vtkProbeFilter works for probing an unstructured grid onto an image, especially with respect to the tolerance. Here is a simple example: import vtk # parameters L = 1. M = 4 # Subdivis…

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## [Reading a VTK version 5.1 datafile in Matlab](https://discourse.vtk.org/t/reading-a-vtk-version-5-1-datafile-in-matlab/13939)

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**Author:** [@nehel](https://discourse.vtk.org/u/nehel)\
**Replies:** 0\
**Last updated:** [May 26, 2024, 9:26pm UTC](https://discourse.vtk.org/t/reading-a-vtk-version-5-1-datafile-in-matlab/13939 "2024-05-26T21:26:56Z")

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Hello, Do you know whether there exists a script to read VTK version 5.1 datafiles in Matlab? Thanks

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## [How to solve the problem of stretching deformation in the captured images of renderwindow](https://discourse.vtk.org/t/how-to-solve-the-problem-of-stretching-deformation-in-the-captured-images-of-renderwindow/13918)

<div class="topic-metadata">

**Author:** [@happyGaomm](https://discourse.vtk.org/u/happyGaomm)\
**Replies:** 0\
**Last updated:** [May 22, 2024, 1:56am UTC](https://discourse.vtk.org/t/how-to-solve-the-problem-of-stretching-deformation-in-the-captured-images-of-renderwindow/13918 "2024-05-22T01:56:31Z")

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Hi vtk community and maintainers, I would like to ask for help with the captureImages API.The model elements I rendered using vtk.js look good on the page. I use the renderwindow captureImages method to obtain a screens…

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## [The effect of where different types of cells are defined in Vtk on their internal index numbers](https://discourse.vtk.org/t/the-effect-of-where-different-types-of-cells-are-defined-in-vtk-on-their-internal-index-numbers/13932)

<div class="topic-metadata">

**Author:** [@hohoyu](https://discourse.vtk.org/u/hohoyu)\
**Replies:** 0\
**Last updated:** [May 25, 2024, 7:58am UTC](https://discourse.vtk.org/t/the-effect-of-where-different-types-of-cells-are-defined-in-vtk-on-their-internal-index-numbers/13932 "2024-05-25T07:58:59Z")

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hi, I have a Vtk file which has both line and facet cells, and even if the facet cell definition is placed before the line cell, when imported using paraview its internal index number is the line cell before the facet c…

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## [Boundary of glyph2D appears white when overlay on darker color contour](https://discourse.vtk.org/t/boundary-of-glyph2d-appears-white-when-overlay-on-darker-color-contour/13915)

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**Author:** [@gaojian95](https://discourse.vtk.org/u/gaojian95)\
**Replies:** 2\
**Last updated:** [May 24, 2024, 11:44am UTC](https://discourse.vtk.org/t/boundary-of-glyph2d-appears-white-when-overlay-on-darker-color-contour/13915 "2024-05-24T11:44:09Z")

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Hello, I am using vtkGlyph2D to plot a vector field (e.g., vtkExample: VectorField) and using vtkImageMapToColors to plot color contour of a scalar field (e.g., vtkExample: ImageMapToColors). I put the actor for the vec…

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## [vtkLookupTable separate components](https://discourse.vtk.org/t/vtklookuptable-separate-components/13928)

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**Author:** [@ljxjah](https://discourse.vtk.org/u/ljxjah)\
**Replies:** 0\
**Last updated:** [May 24, 2024, 12:44am UTC](https://discourse.vtk.org/t/vtklookuptable-separate-components/13928 "2024-05-24T00:44:57Z")

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Hi all, I’ve got a vtkPolyData with 2 attached arrays: an int array which represents strength a double array which represents opacity. I want to colour this data according to a LookupTable - through a vtkPolyMapper. …

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## [Differentiation of binary planes across the Z axis.](https://discourse.vtk.org/t/differentiation-of-binary-planes-across-the-z-axis/13909)

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**Author:** [@constifer](https://discourse.vtk.org/u/constifer)\
**Replies:** 6\
**Last updated:** [May 22, 2024, 8:48am UTC](https://discourse.vtk.org/t/differentiation-of-binary-planes-across-the-z-axis/13909 "2024-05-22T08:48:28Z")

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Hey everyone, in my resent campaign to create binary masks I’ve run into an issue that I’m unsure how to troubleshoot. I’m able to visualize the contours i want to create but when i export them, the images are wrong (I’m…

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## [How to add a texture without background to surface?](https://discourse.vtk.org/t/how-to-add-a-texture-without-background-to-surface/13868)

<div class="topic-metadata">

**Author:** [@learn\_forever](https://discourse.vtk.org/u/learn_forever)\
**Replies:** 5\
**Last updated:** [May 18, 2024, 2:25pm UTC](https://discourse.vtk.org/t/how-to-add-a-texture-without-background-to-surface/13868 "2024-05-18T14:25:46Z")

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Hi Experts: I use vtkClipPolyData with a sphere as clip function to clip a polydata surface. And then add a texture to the clip area. See picture and detailed code snippets below. Here comes my question: how to remove t…

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## [volume rendering error on call GetDepthImage()](https://discourse.vtk.org/t/volume-rendering-error-on-call-getdepthimage/13900)

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**Author:** [@a74856h669](https://discourse.vtk.org/u/a74856h669)\
**Replies:** 0\
**Last updated:** [May 17, 2024, 3:51am UTC](https://discourse.vtk.org/t/volume-rendering-error-on-call-getdepthimage/13900 "2024-05-17T03:51:00Z")

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When I set the six clip planes during volume rendering, the depth image is correct when I don’t rotate the camera lens, but when I rotate the camera lens I get a problem where the depth image is partially missing T…

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## [Issue Using StreamTracer with Calculator](https://discourse.vtk.org/t/issue-using-streamtracer-with-calculator/13877)

<div class="topic-metadata">

**Author:** [@Ludo](https://discourse.vtk.org/u/Ludo)\
**Replies:** 7\
**Last updated:** [May 15, 2024, 10:48pm UTC](https://discourse.vtk.org/t/issue-using-streamtracer-with-calculator/13877 "2024-05-15T22:48:37Z")

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Hello everyone I’m trying to create streamline for both Scalar and Vector array. I have no issue when my data array is scalar but I have issue when handling Vector. My issue is that for Vector, after getting PolyData …

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## [How to merge points with multiple processes.](https://discourse.vtk.org/t/how-to-merge-points-with-multiple-processes/13880)

<div class="topic-metadata">

**Author:** [@Florian\_Maurin1](https://discourse.vtk.org/u/Florian_Maurin1)\
**Replies:** 5\
**Last updated:** [May 15, 2024, 6:34pm UTC](https://discourse.vtk.org/t/how-to-merge-points-with-multiple-processes/13880 "2024-05-15T18:34:24Z")

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I have a kind of discontinuous Galerkin Finite Element Mesh, and I would like to convert it into a continuous mesh using a cleaning/merging filter. By discontinuous mesh, I mean that the points between two adjacent cells…

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## [how to add an image to render window which had point cloud already](https://discourse.vtk.org/t/how-to-add-an-image-to-render-window-which-had-point-cloud-already/13863)

<div class="topic-metadata">

**Author:** [@Yang\_Tianxi](https://discourse.vtk.org/u/Yang_Tianxi)\
**Replies:** 4\
**Last updated:** [May 15, 2024, 10:02am UTC](https://discourse.vtk.org/t/how-to-add-an-image-to-render-window-which-had-point-cloud-already/13863 "2024-05-15T10:02:07Z")

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I write following function to add an image to a rendered window which contained point cloud, it failed void addImageToview(vtkRenderWindowInteractor\* interactor, vtkSmartPointer\<vtkRenderWindow\> renderWindow, const std…

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## [Subclass vtkRenderWindow (no OpenGL support)](https://discourse.vtk.org/t/subclass-vtkrenderwindow-no-opengl-support/13884)

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**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 3\
**Last updated:** [May 14, 2024, 7:07pm UTC](https://discourse.vtk.org/t/subclass-vtkrenderwindow-no-opengl-support/13884 "2024-05-14T19:07:15Z")

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Hi Developers I am in a situation where I would like a convenience vtkRenderView, which is basically a vtkRenderWindow with two renderers, a background and a corner renderer. I use some events for ensuring that the inte…

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## [basic Parallel Coordinates view from an HDF file](https://discourse.vtk.org/t/basic-parallel-coordinates-view-from-an-hdf-file/13861)

<div class="topic-metadata">

**Author:** [@ravelite](https://discourse.vtk.org/u/ravelite)\
**Replies:** 7\
**Last updated:** [May 14, 2024, 2:43pm UTC](https://discourse.vtk.org/t/basic-parallel-coordinates-view-from-an-hdf-file/13861 "2024-05-14T14:43:11Z")

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Greetings, I’m a VTK beginner, seeking help with getting the ParallelCoordinatesView example working with input data from an HDF file: https://examples.vtk.org/site/Python/InfoVis/ParallelCoordinatesView/ The interact…

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## [vtkPolyData points Data type inconsistency?](https://discourse.vtk.org/t/vtkpolydata-points-data-type-inconsistency/13875)

<div class="topic-metadata">

**Author:** [@Seun](https://discourse.vtk.org/u/Seun)\
**Replies:** 2\
**Last updated:** [May 14, 2024, 11:17am UTC](https://discourse.vtk.org/t/vtkpolydata-points-data-type-inconsistency/13875 "2024-05-14T11:17:29Z")

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Hi Everyone, I was wondering if someone could help with this. I am reading a DXF file and trying to build a vtkPolyData from it. The DXF file has coordinates that constitutes points that form a triangle. one of the poin…

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## [cut 1 branch into 2 meshes BUT not effect any other branches/meshes, does VTK support similar operations ?](https://discourse.vtk.org/t/cut-1-branch-into-2-meshes-but-not-effect-any-other-branches-meshes-does-vtk-support-similar-operations/13866)

<div class="topic-metadata">

**Author:** [@gpu](https://discourse.vtk.org/u/gpu)\
**Replies:** 1\
**Last updated:** [May 14, 2024, 10:15am UTC](https://discourse.vtk.org/t/cut-1-branch-into-2-meshes-but-not-effect-any-other-branches-meshes-does-vtk-support-similar-operations/13866 "2024-05-14T10:15:00Z")

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cut 1 branch into 2 meshes BUT not effect any other branches, does VTK support similar operations? eg. There are 3 trees located very closely, many branches from its own parent-tree or adjacent-tree are overlapped. Pi…

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## [Units in VTK](https://discourse.vtk.org/t/units-in-vtk/12892)

<div class="topic-metadata">

**Author:** [@Mordrago](https://discourse.vtk.org/u/Mordrago)\
**Replies:** 4\
**Last updated:** [May 14, 2024, 6:25am UTC](https://discourse.vtk.org/t/units-in-vtk/12892 "2024-05-14T06:25:43Z")

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Hello! What units of measurement does vtk use? I have scans from a CMM with an accuracy of 5 micrometers. I would like to display them by adding the primitives I created to them. Here the question arises what units does…

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