# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=39

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

**Page:** 40

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## [Boolean operation on tow high density polydata in vtk](https://discourse.vtk.org/t/boolean-operation-on-tow-high-density-polydata-in-vtk/12465)

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**Author:** [@Amir](https://discourse.vtk.org/u/Amir)\
**Replies:** 4\
**Last updated:** [October 12, 2023, 8:27am UTC](https://discourse.vtk.org/t/boolean-operation-on-tow-high-density-polydata-in-vtk/12465 "2023-10-12T08:27:59Z")

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I tried to implement boolean operations in my software using vtkBooleanOperationPolyData. This approach worked correctly with the data from vtkSphereSource, but it did not work properly and resulted in errors when used w…

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## [QVTKOpenGLNativeWidget stop the qt page jumping](https://discourse.vtk.org/t/qvtkopenglnativewidget-stop-the-qt-page-jumping/12472)

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**Author:** [@lkuan](https://discourse.vtk.org/u/lkuan)\
**Replies:** 0\
**Last updated:** [October 12, 2023, 1:29am UTC](https://discourse.vtk.org/t/qvtkopenglnativewidget-stop-the-qt-page-jumping/12472 "2023-10-12T01:29:47Z")

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Hi, I’m developing a program using Vtk 9.1 and QT 5.14.2. My main problem is QVTKOpenGLNativeWidget. In my program, the page7 has a QWidget. In order to let the QWidget show a vtk scene, I promote it to a QVTKOpenGLNat…

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## [VTK + QT in emscripten webassembly: opengl ERROR: unknown type name 'PFNGLPUSHDEBUGGROUPPROC'; did you mean 'PFNGLPUSHDEBUGGROUPKHRPROC'](https://discourse.vtk.org/t/vtk-qt-in-emscripten-webassembly-opengl-error-unknown-type-name-pfnglpushdebuggroupproc-did-you-mean-pfnglpushdebuggroupkhrproc/12447)

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**Author:** [@cebugdev](https://discourse.vtk.org/u/cebugdev)\
**Replies:** 9\
**Last updated:** [October 12, 2023, 12:22am UTC](https://discourse.vtk.org/t/vtk-qt-in-emscripten-webassembly-opengl-error-unknown-type-name-pfnglpushdebuggroupproc-did-you-mean-pfnglpushdebuggroupkhrproc/12447 "2023-10-12T00:22:44Z")

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Our previous developer left but he only gave a little information on how he built the project in QT, but we saw that it was built succesfuly as we have seen it runing as a web page (our desktop QT that is). here is what…

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## [Merge partitions of vtkPartitionedDataSet?](https://discourse.vtk.org/t/merge-partitions-of-vtkpartitioneddataset/12469)

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**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 1\
**Last updated:** [October 11, 2023, 6:07pm UTC](https://discourse.vtk.org/t/merge-partitions-of-vtkpartitioneddataset/12469 "2023-10-11T18:07:54Z")

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I have a dataset that is a vtkPartitionedDataSet composed of vtkStructuredGrid partitions. I can read the file in ParaView, and there is a “Merge Blocks” filter available in the GUI that seems to convert vtkPartitionedDa…

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## [using VTK from within a Docker container on OS X (Intel & ARM)](https://discourse.vtk.org/t/using-vtk-from-within-a-docker-container-on-os-x-intel-arm/9375)

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**Author:** [@jerry\_vinokurov](https://discourse.vtk.org/u/jerry_vinokurov)\
**Replies:** 6\
**Last updated:** [October 9, 2023, 10:16pm UTC](https://discourse.vtk.org/t/using-vtk-from-within-a-docker-container-on-os-x-intel-arm/9375 "2023-10-09T22:16:27Z")

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Hello, I have a relatively complex use-case that I will try to describe as best as I can. We (my company) uses Docker for our development. We would like to add visualization capabilities to this code using e.g. pyvista,…

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## [Why would \`vtkPolyDataNormals\` change the number of nodes?](https://discourse.vtk.org/t/why-would-vtkpolydatanormals-change-the-number-of-nodes/12458)

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**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 2\
**Last updated:** [October 9, 2023, 8:57pm UTC](https://discourse.vtk.org/t/why-would-vtkpolydatanormals-change-the-number-of-nodes/12458 "2023-10-09T20:57:55Z")

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I have a \*.vtp file that does not have normals (but needs them for what I am doing next). I wanted to use vtkPolyDataNormals to add them … but it changes the number of nodes?? rd = vtk.vtkXMLPolyDataReader() rd.SetFileN…

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## [Intersection between two 3D meshes](https://discourse.vtk.org/t/intersection-between-two-3d-meshes/12455)

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**Author:** [@Carlos\_Montilla](https://discourse.vtk.org/u/Carlos_Montilla)\
**Replies:** 2\
**Last updated:** [October 9, 2023, 3:13pm UTC](https://discourse.vtk.org/t/intersection-between-two-3d-meshes/12455 "2023-10-09T15:13:28Z")

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Hello developers. I’m new to VTK and I have a question regarding the intersection between two 3-dimensional volume meshes. What I would like to do is to take 2 different 3D meshes, coming from a fluid dynamics simulati…

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## [error when trying to import stl files](https://discourse.vtk.org/t/error-when-trying-to-import-stl-files/12436)

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**Author:** [@evass](https://discourse.vtk.org/u/evass)\
**Replies:** 5\
**Last updated:** [October 9, 2023, 10:39am UTC](https://discourse.vtk.org/t/error-when-trying-to-import-stl-files/12436 "2023-10-09T10:39:36Z")

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Hello. I am using a tool within linux mint (BARAM) to import stl files and then create surface meshes. Although the information contained within the .stl file (like surface names) is loaded, it cannot be displayed. In th…

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## [The Website is not responding](https://discourse.vtk.org/t/the-website-is-not-responding/12433)

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**Author:** [@apteroti](https://discourse.vtk.org/u/apteroti)\
**Replies:** 5\
**Last updated:** [October 6, 2023, 1:59pm UTC](https://discourse.vtk.org/t/the-website-is-not-responding/12433 "2023-10-06T13:59:33Z")

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Now (6th of Oct, 2023) I’m trying to read some documentation (https://vtk.org/doc) and the website is down ( vtk.org refused to connect). What is going on? Cyber attack or maintenance? Updated: the website is back again…

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## [Problem with z-buffering when using Parallel Projection](https://discourse.vtk.org/t/problem-with-z-buffering-when-using-parallel-projection/12430)

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**Author:** [@whereismymoney](https://discourse.vtk.org/u/whereismymoney)\
**Replies:** 1\
**Last updated:** [October 6, 2023, 4:18am UTC](https://discourse.vtk.org/t/problem-with-z-buffering-when-using-parallel-projection/12430 "2023-10-06T04:18:59Z")

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The problem occurs with VTK 8.2.0. The problem does not occur with VTK 6.0.0 or VTK 9.1.0. Attached is some simple code that illustrates the problem. We have two cones (to define the size of the bounding box) and a tiny…

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## [Using \`numpy\_to\_vtk\` I can't seem to get arrays to stay in dataset?](https://discourse.vtk.org/t/using-numpy-to-vtk-i-cant-seem-to-get-arrays-to-stay-in-dataset/12425)

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**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 1\
**Last updated:** [October 5, 2023, 6:06pm UTC](https://discourse.vtk.org/t/using-numpy-to-vtk-i-cant-seem-to-get-arrays-to-stay-in-dataset/12425 "2023-10-05T18:06:32Z")

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I think that there are issues I am having with data starting in NumPy, but not properly “sticking” in my dataset. Peripherally discussed here. The data I am trying to put into VTK lives in a few very large files. One has…

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## [How can I make my interactor stop queuing events while an event is being carried out?](https://discourse.vtk.org/t/how-can-i-make-my-interactor-stop-queuing-events-while-an-event-is-being-carried-out/12404)

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**Author:** [@user12345](https://discourse.vtk.org/u/user12345)\
**Replies:** 4\
**Last updated:** [October 5, 2023, 9:03am UTC](https://discourse.vtk.org/t/how-can-i-make-my-interactor-stop-queuing-events-while-an-event-is-being-carried-out/12404 "2023-10-05T09:03:34Z")

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In this minimal example that moves the camera aimed at the sphere when you right click, I want to have an interactor that moves the camera when I click. This takes some time, and during that time, I want the interactor t…

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## [Volume Rendering not working with NRRD files with negative space direction](https://discourse.vtk.org/t/volume-rendering-not-working-with-nrrd-files-with-negative-space-direction/12412)

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**Author:** [@Pascal](https://discourse.vtk.org/u/Pascal)\
**Replies:** 3\
**Last updated:** [October 5, 2023, 4:42am UTC](https://discourse.vtk.org/t/volume-rendering-not-working-with-nrrd-files-with-negative-space-direction/12412 "2023-10-05T04:42:31Z")

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Hello, I am attempting to use the VTK SmartVolumeMapper to render an NRRD file. While this works well for most of my test files, I have encountered issues with some NRRD files that have negative space directions (e.g. s…

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## [Problems using vtkFloatArray?](https://discourse.vtk.org/t/problems-using-vtkfloatarray/12416)

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**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 8\
**Last updated:** [October 4, 2023, 8:24pm UTC](https://discourse.vtk.org/t/problems-using-vtkfloatarray/12416 "2023-10-04T20:24:00Z")

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Ok - I read in some data from a file using: import numpy as np with open("binary\_stuff.dat", "rb") as f: d = np.fromfile(f, dtype="\>f4", count=1024) # verify no NaNs, etc: assert not np.any(np.isnan(d)) print(f"(mi…

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## [vtk.vtkCommand.TimerEvent](https://discourse.vtk.org/t/vtk-vtkcommand-timerevent/12415)

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**Author:** [@Mordrago](https://discourse.vtk.org/u/Mordrago)\
**Replies:** 1\
**Last updated:** [October 4, 2023, 12:51pm UTC](https://discourse.vtk.org/t/vtk-vtkcommand-timerevent/12415 "2023-10-04T12:51:08Z")

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Hello! It tries to use vtk.vtkCommand.TimerEvent to take X screenshots at a set time. However, the callback from the specified event does not work. Currently, it is only trying to output the iteration id in the console …

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## [Extract maximum "i" surface from vtkStructuredGrid?](https://discourse.vtk.org/t/extract-maximum-i-surface-from-vtkstructuredgrid/12401)

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**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 1\
**Last updated:** [October 2, 2023, 8:20pm UTC](https://discourse.vtk.org/t/extract-maximum-i-surface-from-vtkstructuredgrid/12401 "2023-10-02T20:20:08Z")

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I have a vtkStructuredGrid, read in from a CFD datafile. I’d like to be able to extract the surface where i is maximum, that is to say the surface where the first index is maximum, over all of the other two indices. Is…

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## [VTK/Qt integration and Qt6(Core|Gui)Tools folders](https://discourse.vtk.org/t/vtk-qt-integration-and-qt6-core-gui-tools-folders/12399)

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**Author:** [@codeling](https://discourse.vtk.org/u/codeling)\
**Replies:** 0\
**Last updated:** [October 2, 2023, 12:49pm UTC](https://discourse.vtk.org/t/vtk-qt-integration-and-qt6-core-gui-tools-folders/12399 "2023-10-02T12:49:20Z")

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I asked this question in the itk forum before as I thought this might somehow be related with the way ITK depended on VTK, but it was pointed out that ITK knows nothing about Qt and that the proper solution probably lies…

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## [Mouse over in QML project](https://discourse.vtk.org/t/mouse-over-in-qml-project/12398)

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**Author:** [@ZelieR](https://discourse.vtk.org/u/ZelieR)\
**Replies:** 0\
**Last updated:** [October 2, 2023, 12:33pm UTC](https://discourse.vtk.org/t/mouse-over-in-qml-project/12398 "2023-10-02T12:33:38Z")

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Hi everyone, I’am trying to use vtk in a QML project. I’d like to highlight faces, edges or vertex on the mouse move hover event. I use VTK 9.3.0.rc1 But it seems that it isn’t implemented in VTK as I can see in QVTK…

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## [Deploy trame with caprover, missing files](https://discourse.vtk.org/t/deploy-trame-with-caprover-missing-files/12289)

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**Author:** [@Jupihawx](https://discourse.vtk.org/u/Jupihawx)\
**Replies:** 5\
**Last updated:** [October 2, 2023, 3:06am UTC](https://discourse.vtk.org/t/deploy-trame-with-caprover-missing-files/12289 "2023-10-02T03:06:29Z")

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Hello everyone, First of all thanks for such amazing tools. Now to my issue, I am currently trying to deploy my application using CapRover and Trame. The example cone application works perfectly, but I can’t seem to ma…

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## [HDF5 version support](https://discourse.vtk.org/t/hdf5-version-support/12261)

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**Author:** [@Dave-Allured](https://discourse.vtk.org/u/Dave-Allured)\
**Replies:** 8\
**Last updated:** [October 1, 2023, 2:59am UTC](https://discourse.vtk.org/t/hdf5-version-support/12261 "2023-10-01T02:59:20Z")

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Hello. What is your support plan for HDF5 API versions 1.10 and 1.14? Will you have dual version support? In VTK release notes for 9.3.0.RC1, I find only 1.12 and 1.13 are mentioned. Both of these HDF5 versions are n…

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## [vtkIntegrateAttributes (possible error)](https://discourse.vtk.org/t/vtkintegrateattributes-possible-error/12390)

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**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 2\
**Last updated:** [September 30, 2023, 5:38pm UTC](https://discourse.vtk.org/t/vtkintegrateattributes-possible-error/12390 "2023-09-30T17:38:52Z")

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I am trying to use the vtkIntegrateAttributes. According to the documentation the output should be divided by the area or volume if I use vtkIntegrateAttributes.SetDivideAllCellDataByVolume but the result is unchanged. I…

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## [how can I get the part of ConnectivityFilter,and save it as an stl file.](https://discourse.vtk.org/t/how-can-i-get-the-part-of-connectivityfilter-and-save-it-as-an-stl-file/12393)

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**Author:** [@yangyang117](https://discourse.vtk.org/u/yangyang117)\
**Replies:** 0\
**Last updated:** [September 30, 2023, 7:03am UTC](https://discourse.vtk.org/t/how-can-i-get-the-part-of-connectivityfilter-and-save-it-as-an-stl-file/12393 "2023-09-30T07:03:30Z")

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Hi, i am using vtk.vtkPolyDataConnectivityFilter() as a filter to segment a stl file(or the demo ,vtkFiltersSources), when i use it as the result, I can show it ,but I cannot save it as an stl file. how can I solve thi…

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## [Best file format for vtkMultiBlockDataSet?](https://discourse.vtk.org/t/best-file-format-for-vtkmultiblockdataset/12379)

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**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 2\
**Last updated:** [September 29, 2023, 2:26pm UTC](https://discourse.vtk.org/t/best-file-format-for-vtkmultiblockdataset/12379 "2023-09-29T14:26:49Z")

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I have some CFD data that we’d like to consolidate into a convenient (i.e., easily readable by ParaView) format. We typically read things into VTK and then write them out to something else … right now I have a collection…

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## [How to create PartitionedDataSetCollection in an MPI context ?](https://discourse.vtk.org/t/how-to-create-partitioneddatasetcollection-in-an-mpi-context/12223)

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**Author:** [@untereiner](https://discourse.vtk.org/u/untereiner)\
**Replies:** 3\
**Last updated:** [September 28, 2023, 7:57pm UTC](https://discourse.vtk.org/t/how-to-create-partitioneddatasetcollection-in-an-mpi-context/12223 "2023-09-28T19:57:03Z")

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Hello, There is a thing I do not understand about vtkPartitionedDataSetCollection construction in an MPI context. I have a mesh in a specific data structure distributed over x MPI ranks. The mesh data structure stores …

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## [Pelvis Smoothed Surface from DICOM Image Segmentation](https://discourse.vtk.org/t/pelvis-smoothed-surface-from-dicom-image-segmentation/12361)

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**Author:** [@Miri\_Trope](https://discourse.vtk.org/u/Miri_Trope)\
**Replies:** 11\
**Last updated:** [September 28, 2023, 12:16pm UTC](https://discourse.vtk.org/t/pelvis-smoothed-surface-from-dicom-image-segmentation/12361 "2023-09-28T12:16:38Z")

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Hello everyone, I’m interested in generating a smoothed and closed surface representation of the female pelvis (body) using an MRI DICOM image. It doesn’t need to be exact, just smooth enough for presentation purposes. …

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## [Broken link on VTK nightly documentation examples?](https://discourse.vtk.org/t/broken-link-on-vtk-nightly-documentation-examples/12377)

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**Author:** [@rexthor](https://discourse.vtk.org/u/rexthor)\
**Replies:** 6\
**Last updated:** [September 27, 2023, 1:30pm UTC](https://discourse.vtk.org/t/broken-link-on-vtk-nightly-documentation-examples/12377 "2023-09-27T13:30:17Z")

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I’m not sure where the right place is to report this, but, there are some broken links in the examples for examples for vtkStructuredGrid. Specifically, these links result in 404: SGrid.cxx MultiBlock.cxx

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## [MouseWheelForwardEvent does not work with vtkResliceImageViewer](https://discourse.vtk.org/t/mousewheelforwardevent-does-not-work-with-vtkresliceimageviewer/684)

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**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 1\
**Last updated:** [September 27, 2023, 5:53am UTC](https://discourse.vtk.org/t/mousewheelforwardevent-does-not-work-with-vtkresliceimageviewer/684 "2023-09-27T05:53:51Z")

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Dear all I want to add an observer of mousewheelforward but it does not work. If i change it for another one like InteractionEvent it works but not with the wheel. I even tried to get the event when there is a mouse int…

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## [VTK ray cast volume mapper, how to disable usage of GPU?](https://discourse.vtk.org/t/vtk-ray-cast-volume-mapper-how-to-disable-usage-of-gpu/5330)

<div class="topic-metadata">

**Author:** [@desheng](https://discourse.vtk.org/u/desheng)\
**Replies:** 7\
**Last updated:** [September 26, 2023, 10:34am UTC](https://discourse.vtk.org/t/vtk-ray-cast-volume-mapper-how-to-disable-usage-of-gpu/5330 "2023-09-26T10:34:48Z")

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I have observed a strange behavior of VTK. Same program run on computer with GPU is much slower than computer only have CPU. applied: volume\_mapper = vtk.vtkGPUVolumeRayCastMapper() On computer1(only have CPU) : take…

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## [Update crosslines in Multi planar reconstruction(MPR)](https://discourse.vtk.org/t/update-crosslines-in-multi-planar-reconstruction-mpr/12357)

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**Author:** [@Hedwig\_Huang](https://discourse.vtk.org/u/Hedwig_Huang)\
**Replies:** 0\
**Last updated:** [September 25, 2023, 2:52am UTC](https://discourse.vtk.org/t/update-crosslines-in-multi-planar-reconstruction-mpr/12357 "2023-09-25T02:52:20Z")

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Hey there, I am using VTK-8.0 for MPR, which is initialing 3 windows of axial,coronal and sagittal plane, and each plane with 2 crosslines in it. With moving slice is correct while my rotation is wrong! For example: I…

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## [vtkLineWidget2](https://discourse.vtk.org/t/vtklinewidget2/12351)

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**Author:** [@AnthonyTSV](https://discourse.vtk.org/u/AnthonyTSV)\
**Replies:** 0\
**Last updated:** [September 23, 2023, 11:15am UTC](https://discourse.vtk.org/t/vtklinewidget2/12351 "2023-09-23T11:15:34Z")

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Hi! I’m using vtkLineWidget2 in trame with vtk 9.2.6. I need to disable interaction with the line itself but be able to select and move the end points around. Is it even possible? Any help would be greatly appreciated.

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