# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=73

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

**Page:** 74

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## [Cylindrical grid dataset with VTK](https://discourse.vtk.org/t/cylindrical-grid-dataset-with-vtk/8820)

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**Author:** [@RemDelaporteMathurin](https://discourse.vtk.org/u/RemDelaporteMathurin)\
**Replies:** 0\
**Last updated:** [June 28, 2022, 7:13am UTC](https://discourse.vtk.org/t/cylindrical-grid-dataset-with-vtk/8820 "2022-06-28T07:13:55Z")

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Hi all, I have a set of data that in a cylindrical system of coordinates. I was able in the past to write rectilinear datasets to vtk with vtkRectilinearGrid (see snipset below). I would like to know if there is an eq…

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## [(vtk.js) Looking for a way to add always-front-facing text that maps to an underlying image](https://discourse.vtk.org/t/vtk-js-looking-for-a-way-to-add-always-front-facing-text-that-maps-to-an-underlying-image/8797)

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**Author:** [@mattbrook](https://discourse.vtk.org/u/mattbrook)\
**Replies:** 6\
**Last updated:** [June 27, 2022, 7:10pm UTC](https://discourse.vtk.org/t/vtk-js-looking-for-a-way-to-add-always-front-facing-text-that-maps-to-an-underlying-image/8797 "2022-06-27T19:10:03Z")

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I’m working on an existing website that already has a vtk.js viewer setup. I tried the pixelSpaceCallbackMapper, which seemed to the be the closest to accomplishing my goal, but Spheres w/ Labels example used openGL whic…

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## [how to make rounded trapezoid vtkPolyData or vtkPoints](https://discourse.vtk.org/t/how-to-make-rounded-trapezoid-vtkpolydata-or-vtkpoints/8780)

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**Author:** [@hye00525](https://discourse.vtk.org/u/hye00525)\
**Replies:** 2\
**Last updated:** [June 25, 2022, 10:59pm UTC](https://discourse.vtk.org/t/how-to-make-rounded-trapezoid-vtkpolydata-or-vtkpoints/8780 "2022-06-25T22:59:00Z")

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hello, i’m trying to get vtkPoints (or vtkPolyData) that make up the rounded trapzoid shape. like below, I would like to set the diameter of the rolling circle as a parameter as below. is there good idea? or cod…

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## [How to show in the window for CPR (curved planar reconstruction) data?](https://discourse.vtk.org/t/how-to-show-in-the-window-for-cpr-curved-planar-reconstruction-data/8794)

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**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 1\
**Last updated:** [June 25, 2022, 9:10pm UTC](https://discourse.vtk.org/t/how-to-show-in-the-window-for-cpr-curved-planar-reconstruction-data/8794 "2022-06-25T21:10:46Z")

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I have got the data of CPR using vtkProbfilter，but how to show in the window? I have tried in vtkImageViewer and vtkImageViewer2, but failed . I tried actor added in volume. but it has questions?

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## [CMake error trying to build VTK 9.2.0.rc1 with MPI](https://discourse.vtk.org/t/cmake-error-trying-to-build-vtk-9-2-0-rc1-with-mpi/8805)

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**Author:** [@opoplawski](https://discourse.vtk.org/u/opoplawski)\
**Replies:** 4\
**Last updated:** [June 25, 2022, 9:08pm UTC](https://discourse.vtk.org/t/cmake-error-trying-to-build-vtk-9-2-0-rc1-with-mpi/8805 "2022-06-25T21:08:56Z")

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I’m trying to update the Fedora VTK package to 9.2.0.rc1 and getting the following error: + CC=mpicc + export CC + CXX=mpic++ + export CXX + /usr/bin/cmake -S . -B build-mpich -DCMAKE\_C\_FLAGS\_RELEASE:STRING=-DNDEBUG -DC…

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## [Question about VTK libpython linkage](https://discourse.vtk.org/t/question-about-vtk-libpython-linkage/7736)

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**Author:** [@opoplawski](https://discourse.vtk.org/u/opoplawski)\
**Replies:** 2\
**Last updated:** [June 25, 2022, 3:09am UTC](https://discourse.vtk.org/t/question-about-vtk-libpython-linkage/7736 "2022-06-25T03:09:55Z")

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I’m looking into this bug filed against the Fedora VTK package: 1979611 – linking errors It appears that at least some VTK libraries are not getting linked against libpython, but I don’t know why. I don’t believe we ar…

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## [GDAL Library building/binding](https://discourse.vtk.org/t/gdal-library-building-binding/8787)

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**Author:** [@drpeterfranz](https://discourse.vtk.org/u/drpeterfranz)\
**Replies:** 3\
**Last updated:** [June 24, 2022, 11:38pm UTC](https://discourse.vtk.org/t/gdal-library-building-binding/8787 "2022-06-24T23:38:18Z")

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I want to use vtkGDALRasterReader in my project. VTK is bound into my project using CMake, and I use VTK via add\_subdirectory. vtkGDARasterReader requires the GDAL library which is available from https://github.com/OSGe…

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## [How to use vtkImplicitFunction.SetTransform()?](https://discourse.vtk.org/t/how-to-use-vtkimplicitfunction-settransform/8785)

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**Author:** [@MJJ](https://discourse.vtk.org/u/MJJ)\
**Replies:** 0\
**Last updated:** [June 22, 2022, 4:38pm UTC](https://discourse.vtk.org/t/how-to-use-vtkimplicitfunction-settransform/8785 "2022-06-22T16:38:35Z")

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I have a vtkBox with a transform set. However, the transform never seems to be applied to the input points. Here is the code so you can see for yourself: import vtk box\_origin = \[420, 69, 420.69\] T = vtk.vtkTransform…

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## [FixedPoint volume rendering does not work](https://discourse.vtk.org/t/fixedpoint-volume-rendering-does-not-work/8772)

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**Author:** [@Frank\_Gao](https://discourse.vtk.org/u/Frank_Gao)\
**Replies:** 4\
**Last updated:** [June 22, 2022, 5:01pm UTC](https://discourse.vtk.org/t/fixedpoint-volume-rendering-does-not-work/8772 "2022-06-22T17:01:16Z")

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Hello, I am trying to run my application usgin GPUOpenGLRayCastMapper, it just crashed. So I think maybe I can use vtkFixedPointVolumeRayCastMapper. Then another problem. vtkFixedPointVolumeRayCastMapper has a member o…

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## [ClipPolydata with points that are all around the polydata](https://discourse.vtk.org/t/clippolydata-with-points-that-are-all-around-the-polydata/5337)

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**Author:** [@Beheshtian](https://discourse.vtk.org/u/Beheshtian)\
**Replies:** 9\
**Last updated:** [June 22, 2022, 4:47am UTC](https://discourse.vtk.org/t/clippolydata-with-points-that-are-all-around-the-polydata/5337 "2022-06-22T04:47:39Z")

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Hi All, I need to clip a polydata with some points. I used SelectPolydata but sometimes it doesn’t work because of the “can not follow edge” error (see code blew). loop = vtk.vtkSelectPolyData() loop.SetInputDa…

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## [vtkFlyingEdges2D generates scaled contours](https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766)

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**Author:** [@xxyyy159](https://discourse.vtk.org/u/xxyyy159)\
**Replies:** 3\
**Last updated:** [June 22, 2022, 1:23am UTC](https://discourse.vtk.org/t/vtkflyingedges2d-generates-scaled-contours/8766 "2022-06-22T01:23:29Z")

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Hi all, I’m implementing vtkFlyingEdges2D to a CT image to generate a contour of the bone. But the output of vtkFlyingEdges2D has been scaled to a level of 1.2x. I post the result below. bounds of contour \>\> 69.9951…

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## [vtkMath::Jacobi: error extracting eigenfunctions while using vtkOBBTree](https://discourse.vtk.org/t/vtkmath-error-extracting-eigenfunctions-while-using-vtkobbtree/8773)

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**Author:** [@adeelz92](https://discourse.vtk.org/u/adeelz92)\
**Replies:** 0\
**Last updated:** [June 22, 2022, 12:43am UTC](https://discourse.vtk.org/t/vtkmath-error-extracting-eigenfunctions-while-using-vtkobbtree/8773 "2022-06-22T00:43:43Z")

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Hi, I am using vtkVortexCore filter to extract vortex core lines from the input polydata. After that I am using vtkConnectivityFilter to separate each polyline into its own polydata. After that I am using vtkOBBTree to …

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## [Prevent symbols from being only local to the library?](https://discourse.vtk.org/t/prevent-symbols-from-being-only-local-to-the-library/8752)

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**Author:** [@jrobcary](https://discourse.vtk.org/u/jrobcary)\
**Replies:** 4\
**Last updated:** [June 21, 2022, 10:05pm UTC](https://discourse.vtk.org/t/prevent-symbols-from-being-only-local-to-the-library/8752 "2022-06-21T22:05:15Z")

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I have been trying to link a code to vtk using gcc-11.2.0. The link fails with /usr/bin/ld: /…/vtk4ctk-8.1.0-sersh/lib/libvtkCommonExecutionModel-8.1.so.1: undefined reference to \`vtkCollectionIterator::GoToFirstItem()…

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## [Does VTK support reading LZW-compressed TIFF?](https://discourse.vtk.org/t/does-vtk-support-reading-lzw-compressed-tiff/8750)

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**Author:** [@MKRangers](https://discourse.vtk.org/u/MKRangers)\
**Replies:** 4\
**Last updated:** [June 21, 2022, 6:41pm UTC](https://discourse.vtk.org/t/does-vtk-support-reading-lzw-compressed-tiff/8750 "2022-06-21T18:41:26Z")

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Hi everyone, I have some TIFFs that cannot be read with vtkTIFFReader, but ImageJ and ParaView can read and display them perfectly. So I used ImageJ to open these TIFFs and saved them as TIFFs again, and now these newly…

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## [Why does FlyingEdges resulting Data have more points than the original?](https://discourse.vtk.org/t/why-does-flyingedges-resulting-data-have-more-points-than-the-original/8757)

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**Author:** [@Seun](https://discourse.vtk.org/u/Seun)\
**Replies:** 6\
**Last updated:** [June 20, 2022, 4:56pm UTC](https://discourse.vtk.org/t/why-does-flyingedges-resulting-data-have-more-points-than-the-original/8757 "2022-06-20T16:56:23Z")

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\`Hello everyone, I have a question and was wondering if anyone could chime in on this. I've been working with the FlyingEdges3D class and recently I noticed on closer inspection that the resulting vtkPolyData generated…

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## [SSAO with multiple renderers](https://discourse.vtk.org/t/ssao-with-multiple-renderers/8746)

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**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\
**Replies:** 1\
**Last updated:** [June 20, 2022, 2:42pm UTC](https://discourse.vtk.org/t/ssao-with-multiple-renderers/8746 "2022-06-20T14:42:15Z")

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I’m experimenting with SSAO for our FEA application. We have a background renderer (in layer 0) that displays a gradient background and - optionally - a watermark image, and a scene renderer (in layer 1) that renders the…

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## [3D Widget + ResetCamera = question !](https://discourse.vtk.org/t/3d-widget-resetcamera-question/8764)

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**Author:** [@Olivier](https://discourse.vtk.org/u/Olivier)\
**Replies:** 0\
**Last updated:** [June 20, 2022, 12:05pm UTC](https://discourse.vtk.org/t/3d-widget-resetcamera-question/8764 "2022-06-20T12:05:19Z")

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Hi Friends, I’m using a customized PlaneWidget to display and modify interactively the clipping plane used by a ClipClosedSurface algo. The PlaneWidget is using a couple of vtkActor2D to materialize the handles used to…

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## [Question about instancing efficiency between vtk8.2 and vtk9.0](https://discourse.vtk.org/t/question-about-instancing-efficiency-between-vtk8-2-and-vtk9-0/8723)

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**Author:** [@xianger.qi](https://discourse.vtk.org/u/xianger.qi)\
**Replies:** 2\
**Last updated:** [June 17, 2022, 2:40pm UTC](https://discourse.vtk.org/t/question-about-instancing-efficiency-between-vtk8-2-and-vtk9-0/8723 "2022-06-17T14:40:59Z")

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Hey guys, i took a test about variable instancing efficiency between vtk8.2 and vtk9.0 on different class. Here was what i got: testing times: 10000 Statistical method: average instancing time the method instancing: …

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## [How to make XXXReader to support chinese file path under windows 7?](https://discourse.vtk.org/t/how-to-make-xxxreader-to-support-chinese-file-path-under-windows-7/8715)

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**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 6\
**Last updated:** [June 17, 2022, 7:45am UTC](https://discourse.vtk.org/t/how-to-make-xxxreader-to-support-chinese-file-path-under-windows-7/8715 "2022-06-17T07:45:29Z")

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Hello,this code: OBJReader reader=OBJReader::New(); reader-\>SetFileName(“c://user/用户/中文/model.obj”); //reader-\>SetFileName(“/home/user/中文/model.obj”); //for linux reader-\>Update(); auto data = reader-\>GetOutput(); …

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## [Converting triangular polydata to quadratic](https://discourse.vtk.org/t/converting-triangular-polydata-to-quadratic/8744)

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**Author:** [@Danial\_Mohajery](https://discourse.vtk.org/u/Danial_Mohajery)\
**Replies:** 0\
**Last updated:** [June 16, 2022, 9:33am UTC](https://discourse.vtk.org/t/converting-triangular-polydata-to-quadratic/8744 "2022-06-16T09:33:10Z")

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Hi, I have segmentation data that I use with MarchingCubes to make an isosurface. Then I use this surface with the probe filter to map intensity values on the mesh. The resulting geometry has triangular elements (see th…

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## [how to make blood vessel model from 3d points](https://discourse.vtk.org/t/how-to-make-blood-vessel-model-from-3d-points/8739)

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**Author:** [@gobenpark](https://discourse.vtk.org/u/gobenpark)\
**Replies:** 0\
**Last updated:** [June 15, 2022, 3:13pm UTC](https://discourse.vtk.org/t/how-to-make-blood-vessel-model-from-3d-points/8739 "2022-06-15T15:13:02Z")

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i want to make a blood vessel model with 15 groups of x y z points by making a points for every 15 dicom view ( mri ) So, I composed and expressed the points and the triangular face of each point manually with polydata,…

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## [Confusion with tool selection: VTK vs ParaView for Web-based volume rendering of large data sets](https://discourse.vtk.org/t/confusion-with-tool-selection-vtk-vs-paraview-for-web-based-volume-rendering-of-large-data-sets/1384)

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**Author:** [@bekos](https://discourse.vtk.org/u/bekos)\
**Replies:** 4\
**Last updated:** [June 15, 2022, 2:08pm UTC](https://discourse.vtk.org/t/confusion-with-tool-selection-vtk-vs-paraview-for-web-based-volume-rendering-of-large-data-sets/1384 "2022-06-15T14:08:06Z")

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Hello, I want to develop a Web-based application which performs interactive/real-time volume rendering on a remote server and displays the result on a Web browser. After some reading it appears that VTK, Paraview, and r…

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## [What is the best way to cut a polydata with a sphere and fill it](https://discourse.vtk.org/t/what-is-the-best-way-to-cut-a-polydata-with-a-sphere-and-fill-it/8734)

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**Author:** [@pedrorib3](https://discourse.vtk.org/u/pedrorib3)\
**Replies:** 3\
**Last updated:** [June 15, 2022, 12:33pm UTC](https://discourse.vtk.org/t/what-is-the-best-way-to-cut-a-polydata-with-a-sphere-and-fill-it/8734 "2022-06-15T12:33:34Z")

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Hi, What is the best way to cut a polydata with a sphere and fill it? I have already tried lots of different approaches: vtkBooleanOperationPolydataFilter (with SetOpperationtoDifference) - this seems to achieve the…

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## [How to draw arrows on the reslicer using vtk?](https://discourse.vtk.org/t/how-to-draw-arrows-on-the-reslicer-using-vtk/8719)

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**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 2\
**Last updated:** [June 15, 2022, 1:22am UTC](https://discourse.vtk.org/t/how-to-draw-arrows-on-the-reslicer-using-vtk/8719 "2022-06-15T01:22:14Z")

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How to draw an arrow like the 3D slicer?

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## [How to read tif file using vtkImageReader2](https://discourse.vtk.org/t/how-to-read-tif-file-using-vtkimagereader2/8727)

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**Author:** [@MKRangers](https://discourse.vtk.org/u/MKRangers)\
**Replies:** 0\
**Last updated:** [June 14, 2022, 11:21pm UTC](https://discourse.vtk.org/t/how-to-read-tif-file-using-vtkimagereader2/8727 "2022-06-14T23:21:55Z")

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Hi everyone, I have some 16-bit 3D tif files to be read. For some reason vtkTIFFReader cannot read them. However, both ImageJ and ParaView can read and display the images without a problem. So I assumed that there could…

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## [Question About Activiz versions](https://discourse.vtk.org/t/question-about-activiz-versions/8701)

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**Author:** [@ahmed.elmalky](https://discourse.vtk.org/u/ahmed.elmalky)\
**Replies:** 3\
**Last updated:** [June 14, 2022, 7:26am UTC](https://discourse.vtk.org/t/question-about-activiz-versions/8701 "2022-06-14T07:26:16Z")

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Hi All, i am new to vtk and i have tasks in C# project that uses ActiViz what i found in the user guide that Activiz comes in two forms - Open-Source edition and supported edition and i found a big delta in the version…

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## [inner edge display for quadric element is not correct for version 9.1](https://discourse.vtk.org/t/inner-edge-display-for-quadric-element-is-not-correct-for-version-9-1/7665)

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**Author:** [@Jay-Yu](https://discourse.vtk.org/u/Jay-Yu)\
**Replies:** 9\
**Last updated:** [June 13, 2022, 9:10am UTC](https://discourse.vtk.org/t/inner-edge-display-for-quadric-element-is-not-correct-for-version-9-1/7665 "2022-06-13T09:10:55Z")

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Could any one help me to solve this issue? the attached file is polyData with quadratic quad elements. when i display surface grid with version 9.0, everything is wonderful. but for version 9.1, some edges visibility are…

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## [Remove faces in contact with non-manifold edges](https://discourse.vtk.org/t/remove-faces-in-contact-with-non-manifold-edges/4116)

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**Author:** [@Lucas\_A](https://discourse.vtk.org/u/Lucas_A)\
**Replies:** 13\
**Last updated:** [June 13, 2022, 4:08am UTC](https://discourse.vtk.org/t/remove-faces-in-contact-with-non-manifold-edges/4116 "2022-06-13T04:08:00Z")

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Hi, I have as input a (triangular) mesh that has some holes. I’m trying to execute the vtkFillHolesFilter to close all the holes. It works well for most of the holes, but some of them are not being closed. I discovered …

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## [how to use QVTKOpenGLNativeWidget to load pcd files with vtk9.1](https://discourse.vtk.org/t/how-to-use-qvtkopenglnativewidget-to-load-pcd-files-with-vtk9-1/8711)

<div class="topic-metadata">

**Author:** [@Marquis3000](https://discourse.vtk.org/u/Marquis3000)\
**Replies:** 0\
**Last updated:** [June 13, 2022, 2:56am UTC](https://discourse.vtk.org/t/how-to-use-qvtkopenglnativewidget-to-load-pcd-files-with-vtk9-1/8711 "2022-06-13T02:56:12Z")

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There is no qtvtkwidget in the latest version of VTK after compilation, I don’t know how to use the new widget(QVTKOpenGLNativeWidget) to load PCD point cloud files. ~Thanks.

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## [vtkDICOM - is there a list of CT vendors that are supported 'out of the box'](https://discourse.vtk.org/t/vtkdicom-is-there-a-list-of-ct-vendors-that-are-supported-out-of-the-box/8696)

<div class="topic-metadata">

**Author:** [@Orell](https://discourse.vtk.org/u/Orell)\
**Replies:** 2\
**Last updated:** [June 10, 2022, 3:28pm UTC](https://discourse.vtk.org/t/vtkdicom-is-there-a-list-of-ct-vendors-that-are-supported-out-of-the-box/8696 "2022-06-10T15:28:51Z")

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Is there a document listing the vendors and scanner models that are supported by vtkDICOM

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