# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=145

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

**Page:** 146

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## [The dragging is not working with 'WindowInteractor'.](https://discourse.vtk.org/t/the-dragging-is-not-working-with-windowinteractor/2090)

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**Author:** [@Kim\_William](https://discourse.vtk.org/u/Kim_William)\
**Replies:** 1\
**Last updated:** [November 18, 2019, 6:14am UTC](https://discourse.vtk.org/t/the-dragging-is-not-working-with-windowinteractor/2090 "2019-11-18T06:14:06Z")

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Hi all. I have tested the Line Plot with VTK 8.9 on MFC. I referred to the sample code as below: https://lorensen.github.io/VTKExamples/site/Cxx/Plotting/LinePlot/ Initially, I can drag by clicking the mouse left but…

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## [Extracting regions as PolyData](https://discourse.vtk.org/t/extracting-regions-as-polydata/1788)

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**Author:** [@Srihitha](https://discourse.vtk.org/u/Srihitha)\
**Replies:** 11\
**Last updated:** [November 15, 2019, 11:54pm UTC](https://discourse.vtk.org/t/extracting-regions-as-polydata/1788 "2019-11-15T23:54:34Z")

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Hi, I am having a polydata containing multiple regions. I want to extract these regions as individual polydata. Using “vtkPolyDataConnectivityFilter”, I am able to get the total count of extracted regions and able to v…

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## [vtkChartXY - Log Scaling X](https://discourse.vtk.org/t/vtkchartxy-log-scaling-x/2094)

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**Author:** [@ChristopherWaters](https://discourse.vtk.org/u/ChristopherWaters)\
**Replies:** 1\
**Last updated:** [November 16, 2019, 8:56am UTC](https://discourse.vtk.org/t/vtkchartxy-log-scaling-x/2094 "2019-11-16T08:56:28Z")

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I have a vtkChartXY and have no idea how to enable log scaling of the x-axis. The y-axis is easy, just requiring: chart-\>GetAxis(vtkAxis::LEFT)-\>LogScaleOn(); The x-axis is another story, since it is based off of th…

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## [File format for polyhedron unstructured grid data](https://discourse.vtk.org/t/file-format-for-polyhedron-unstructured-grid-data/1914)

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**Author:** [@tkeskita](https://discourse.vtk.org/u/tkeskita)\
**Replies:** 1\
**Last updated:** [November 14, 2019, 10:45am UTC](https://discourse.vtk.org/t/file-format-for-polyhedron-unstructured-grid-data/1914 "2019-11-14T10:45:37Z")

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Hello, I’d like to write an exporter of 3D unstructured volume grids (cells composed of arbitrary shapes of polyhedrons, serial data format) to export the 3D grid to VTK. I guess my options include the XML Unstructured …

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## [CT vs MRI reading](https://discourse.vtk.org/t/ct-vs-mri-reading/2095)

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**Author:** [@flaviu2](https://discourse.vtk.org/u/flaviu2)\
**Replies:** 0\
**Last updated:** [November 14, 2019, 9:39am UTC](https://discourse.vtk.org/t/ct-vs-mri-reading/2095 "2019-11-14T09:39:39Z")

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Is there any difference between read DICOM CT data or DICOM MRI data ? I have written code that read DICOM data and represent it as vtkVolume. I used DICOM VTK library for that (https://github.com/dgobbi/vtk-dicom) (BTW,…

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## [How to decide between QVTKOpenGL{Native}Widget?](https://discourse.vtk.org/t/how-to-decide-between-qvtkopengl-native-widget/1070)

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**Author:** [@estan](https://discourse.vtk.org/u/estan)\
**Replies:** 8\
**Last updated:** [November 13, 2019, 10:17pm UTC](https://discourse.vtk.org/t/how-to-decide-between-qvtkopengl-native-widget/1070 "2019-11-13T22:17:15Z")

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Hi all, The advice in the thread “the New QVTKOpenGLWidget” on the development mailing list read: \*\*1. Why is there a new widget and what does it do ?\*\* We have been having some issues reported for the old widget, and…

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## [Intel UHD 620 + VTK + Qt bug with new drivers on windows](https://discourse.vtk.org/t/intel-uhd-620-vtk-qt-bug-with-new-drivers-on-windows/1694)

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**Author:** [@simonesneault](https://discourse.vtk.org/u/simonesneault)\
**Replies:** 14\
**Last updated:** [November 13, 2019, 10:15pm UTC](https://discourse.vtk.org/t/intel-uhd-620-vtk-qt-bug-with-new-drivers-on-windows/1694 "2019-11-13T22:15:28Z")

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Hello community, We are affected by a bug on windows after some recent Intel drivers update (versions superior to 26.20.100.6708). It is no longer possible to have a QVTKOpenGLWidget and a QWebEngineView working in the …

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## [QtOpenGLNativeWidget - here's a simple broken example](https://discourse.vtk.org/t/qtopenglnativewidget-heres-a-simple-broken-example/2089)

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**Author:** [@DominionSoftware](https://discourse.vtk.org/u/DominionSoftware)\
**Replies:** 4\
**Last updated:** [November 13, 2019, 8:08pm UTC](https://discourse.vtk.org/t/qtopenglnativewidget-heres-a-simple-broken-example/2089 "2019-11-13T20:08:53Z")

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Here’s a simple example of loading the plastic skull that is similar to Medical4 demo. If someone could see what’s wrong with this code that would be great… Thanks Rick

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## [Export linear extrusion as .ply file](https://discourse.vtk.org/t/export-linear-extrusion-as-ply-file/2092)

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**Author:** [@Mskovmand](https://discourse.vtk.org/u/Mskovmand)\
**Replies:** 1\
**Last updated:** [November 13, 2019, 3:04pm UTC](https://discourse.vtk.org/t/export-linear-extrusion-as-ply-file/2092 "2019-11-13T15:04:40Z")

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Hello, I’ve had great luck exporting colored glyphs as .ply files for use in other software. Now I’m trying to export some “cylinders” which are created using a linear extrusion, more specifically, like this: disk = v…

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## [draw line](https://discourse.vtk.org/t/draw-line/320)

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**Author:** [@dp1991](https://discourse.vtk.org/u/dp1991)\
**Replies:** 1\
**Last updated:** [November 13, 2019, 11:56am UTC](https://discourse.vtk.org/t/draw-line/320 "2019-11-13T11:56:42Z")

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Hello friends, how can i draw a line on the dicom image using mouse ?? 2D and 3D mode .

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## [vtkVolume not rendering when using QVTKOpenGLNativeWidget](https://discourse.vtk.org/t/vtkvolume-not-rendering-when-using-qvtkopenglnativewidget/1547)

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**Author:** [@NewProggie](https://discourse.vtk.org/u/NewProggie)\
**Replies:** 9\
**Last updated:** [November 13, 2019, 10:07am UTC](https://discourse.vtk.org/t/vtkvolume-not-rendering-when-using-qvtkopenglnativewidget/1547 "2019-11-13T10:07:14Z")

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Hi all, I’m currently experiencing a strange rendering issue where a vtkVolume is not rendered when displayed inside a QVTKOpenGLNativeWidget. It works fine when testing the same code/pipeline with a simple vtkSphere th…

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## [vtkViewsQt](https://discourse.vtk.org/t/vtkviewsqt/2087)

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**Author:** [@DominionSoftware](https://discourse.vtk.org/u/DominionSoftware)\
**Replies:** 0\
**Last updated:** [November 12, 2019, 6:03pm UTC](https://discourse.vtk.org/t/vtkviewsqt/2087 "2019-11-12T18:03:05Z")

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In CMake, what does vtkViewQt do vs the other Qt flags? It’s confusing what one needs and what one doesn’t need to check off.

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## [How I write a properity for a system not for a determined point in vtk unstructuredreader](https://discourse.vtk.org/t/how-i-write-a-properity-for-a-system-not-for-a-determined-point-in-vtk-unstructuredreader/2077)

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**Author:** [@hgropelli](https://discourse.vtk.org/u/hgropelli)\
**Replies:** 2\
**Last updated:** [November 12, 2019, 4:07pm UTC](https://discourse.vtk.org/t/how-i-write-a-properity-for-a-system-not-for-a-determined-point-in-vtk-unstructuredreader/2077 "2019-11-12T16:07:04Z")

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Writing during a calculation demands much time, I am searching a for a way, for example, print time, average total energy, average overlap… In other words properties that applies for a system of particles without having …

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## [QVTKOpenGLNativeWidget and volume renderering](https://discourse.vtk.org/t/qvtkopenglnativewidget-and-volume-renderering/2085)

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**Author:** [@DominionSoftware](https://discourse.vtk.org/u/DominionSoftware)\
**Replies:** 0\
**Last updated:** [November 12, 2019, 2:48am UTC](https://discourse.vtk.org/t/qvtkopenglnativewidget-and-volume-renderering/2085 "2019-11-12T02:48:29Z")

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I have a Qt 5.13 app with 2 views and a splitter. I’m using QVTKOpenGLNativeWidget. I can render geometry no problem - cylinders, etc. But I cannot render a vtkVolume. Anyone have any sample code that works? I can str…

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## [Compilation issue after migrating to VTK-8.2](https://discourse.vtk.org/t/compilation-issue-after-migrating-to-vtk-8-2/2082)

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**Author:** [@efourkal](https://discourse.vtk.org/u/efourkal)\
**Replies:** 4\
**Last updated:** [November 11, 2019, 4:59pm UTC](https://discourse.vtk.org/t/compilation-issue-after-migrating-to-vtk-8-2/2082 "2019-11-11T16:59:00Z")

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I have a research code that uses VTK-5.2 for visualization. In my Makefile I link specific VTK libraries for compilation. After installing VTK-8.2, the program does not compile. How do I need to change the Makefile to ma…

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## [Python vtk: vtkImageImport method SetDataDirection() is not available in python vtk 8.2.0](https://discourse.vtk.org/t/python-vtk-vtkimageimport-method-setdatadirection-is-not-available-in-python-vtk-8-2-0/1837)

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**Author:** [@vipulraikar](https://discourse.vtk.org/u/vipulraikar)\
**Replies:** 2\
**Last updated:** [November 10, 2019, 11:58pm UTC](https://discourse.vtk.org/t/python-vtk-vtkimageimport-method-setdatadirection-is-not-available-in-python-vtk-8-2-0/1837 "2019-11-10T23:58:37Z")

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Hi Team, I have been trying to set the data direction for some volumes in vtkImageImport in python. The issue I am facing is that it’s not possible to access the method Set/GetDataDirection for the object of the type vt…

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## [Prevent Renderer from Smoothing Image - Prefer to See Pixelated](https://discourse.vtk.org/t/prevent-renderer-from-smoothing-image-prefer-to-see-pixelated/2075)

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**Author:** [@MichelleKline](https://discourse.vtk.org/u/MichelleKline)\
**Replies:** 6\
**Last updated:** [November 9, 2019, 8:26am UTC](https://discourse.vtk.org/t/prevent-renderer-from-smoothing-image-prefer-to-see-pixelated/2075 "2019-11-09T08:26:37Z")

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Hello, I am displaying images in a vtkRenderWindow using vtkImageSlice (with a vtkImageResliceToColors mapper), a vtkImageStack, and a vtkRenderer. When the images render, they appear “smoothed”. If I zoom in on an in…

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## [improving VTK rendering speed on Windows virtual machines](https://discourse.vtk.org/t/improving-vtk-rendering-speed-on-windows-virtual-machines/2050)

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**Author:** [@dmgroppe](https://discourse.vtk.org/u/dmgroppe)\
**Replies:** 2\
**Last updated:** [November 8, 2019, 9:45pm UTC](https://discourse.vtk.org/t/improving-vtk-rendering-speed-on-windows-virtual-machines/2050 "2019-11-08T21:45:59Z")

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Hi all, I’m developing a VTK app for Windows but occasionally I want to run it on a Mac via a Windows virtual machine. When I run my app on Windows, VTK uses OpenGL2. However, to run the app on a Virtual Machine, I need …

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## [VTK build fails: cannot open input file '..\\..\\lib\\Release\\vtkWrappingTools-8.90.lib'](https://discourse.vtk.org/t/vtk-build-fails-cannot-open-input-file-lib-release-vtkwrappingtools-8-90-lib/2074)

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**Author:** [@lassoan](https://discourse.vtk.org/u/lassoan)\
**Replies:** 4\
**Last updated:** [November 8, 2019, 4:31pm UTC](https://discourse.vtk.org/t/vtk-build-fails-cannot-open-input-file-lib-release-vtkwrappingtools-8-90-lib/2074 "2019-11-08T16:31:09Z")

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I’m trying to build 3D Slicer with latest VTK master. I have hard time figuring out what how to translate previously used CMake options (VTK\_Group\_Qt, VTK\_ENABLE\_KITS, VTK\_USE\_PARALLEL, …) to the new build system. Is …

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## [vtkImageReslice execution speed difference](https://discourse.vtk.org/t/vtkimagereslice-execution-speed-difference/2064)

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**Author:** [@Aisec](https://discourse.vtk.org/u/Aisec)\
**Replies:** 1\
**Last updated:** [November 7, 2019, 6:40pm UTC](https://discourse.vtk.org/t/vtkimagereslice-execution-speed-difference/2064 "2019-11-07T18:40:15Z")

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Hello, I’m using vtkImageReslice to make oblique mpr for my application. The other day I found out that it takes couple times longer for filter to extract sagittal slices than coronal. Is it expected behavior?

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## [Visualise 3D finite element data by slice](https://discourse.vtk.org/t/visualise-3d-finite-element-data-by-slice/1900)

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**Author:** [@gib](https://discourse.vtk.org/u/gib)\
**Replies:** 2\
**Last updated:** [November 7, 2019, 12:07pm UTC](https://discourse.vtk.org/t/visualise-3d-finite-element-data-by-slice/1900 "2019-11-07T12:07:14Z")

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I have a program that solves for scalar fields on a 3D finite element mesh, and I I want to be able to view slices, e.g. 2D field at a given value of z. Further, I want to display this within a Qt application. I assume…

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## [point rendering problem in vtkimageviewer2](https://discourse.vtk.org/t/point-rendering-problem-in-vtkimageviewer2/2058)

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**Author:** [@sanidhya26](https://discourse.vtk.org/u/sanidhya26)\
**Replies:** 0\
**Last updated:** [November 6, 2019, 8:21pm UTC](https://discourse.vtk.org/t/point-rendering-problem-in-vtkimageviewer2/2058 "2019-11-06T20:21:37Z")

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I am trying to render a point on vtkimageviewer2. I am using vtkpointpicker for selecting the point but sometimes the point is not visible on the slice I select it on. Here is my code: Picker initialization: worldPicke…

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## [Error: Building VTK from Source - vtkWrapHierarchy](https://discourse.vtk.org/t/error-building-vtk-from-source-vtkwraphierarchy/2053)

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**Author:** [@Nicholas\_Draper](https://discourse.vtk.org/u/Nicholas_Draper)\
**Replies:** 1\
**Last updated:** [November 6, 2019, 12:19pm UTC](https://discourse.vtk.org/t/error-building-vtk-from-source-vtkwraphierarchy/2053 "2019-11-06T12:19:50Z")

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I cloned the VTK repository to my local machine. I created a build folder inside the cloned directory and ran the CMake file from within the build folder. I then ran make from within that build directory as well. I rece…

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## [after Reslice does the world coordinates of a point change?](https://discourse.vtk.org/t/after-reslice-does-the-world-coordinates-of-a-point-change/2048)

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**Author:** [@Aravind](https://discourse.vtk.org/u/Aravind)\
**Replies:** 8\
**Last updated:** [November 6, 2019, 6:18am UTC](https://discourse.vtk.org/t/after-reslice-does-the-world-coordinates-of-a-point-change/2048 "2019-11-06T06:18:30Z")

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Hello - I have run into some basic issues and unable to find a clear explanation of that on the web. I have a brain scan that i want to reorient such that I have the AC ( anterior commisure point in the brain ) and PC (…

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## [What's the version of libtiff used in VTK 8.2.0](https://discourse.vtk.org/t/whats-the-version-of-libtiff-used-in-vtk-8-2-0/2039)

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**Author:** [@yuhuimoon](https://discourse.vtk.org/u/yuhuimoon)\
**Replies:** 1\
**Last updated:** [November 5, 2019, 6:52pm UTC](https://discourse.vtk.org/t/whats-the-version-of-libtiff-used-in-vtk-8-2-0/2039 "2019-11-05T18:52:26Z")

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I am a beginner of VTK. I build VTK8.2.0 with mingw (for QT) in Windows. I have download the latest version libTiff from the link(http://download.osgeo.org/libtiff/). I have generate files successfully in CMake. I chose …

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## [rendering slows down](https://discourse.vtk.org/t/rendering-slows-down/226)

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**Author:** [@kondreti](https://discourse.vtk.org/u/kondreti)\
**Replies:** 1\
**Last updated:** [November 5, 2019, 3:16pm UTC](https://discourse.vtk.org/t/rendering-slows-down/226 "2019-11-05T15:16:28Z")

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Adding same actor multiple times on first time added point cloud is ok. After that I have attached another point cloud, but now rendering and all other operations slowed down (even i have removes all actors). Any suggest…

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## [Anaglyph rendering bug?](https://discourse.vtk.org/t/anaglyph-rendering-bug/1887)

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**Author:** [@dmgroppe](https://discourse.vtk.org/u/dmgroppe)\
**Replies:** 2\
**Last updated:** [November 5, 2019, 4:54pm UTC](https://discourse.vtk.org/t/anaglyph-rendering-bug/1887 "2019-11-05T16:54:47Z")

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Hi all, I’m trying to render a raycast volume with some polydata (spheres and tubes) in 3D with VTK’s anaglyph functionality. I set the render window’s stereo type to the default red-cyan anaglyph with the SetStereoType…

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## [VTK Surface creation with vtkExtractSurface](https://discourse.vtk.org/t/vtk-surface-creation-with-vtkextractsurface/2041)

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**Author:** [@gishu](https://discourse.vtk.org/u/gishu)\
**Replies:** 0\
**Last updated:** [November 5, 2019, 8:05am UTC](https://discourse.vtk.org/t/vtk-surface-creation-with-vtkextractsurface/2041 "2019-11-05T08:05:44Z")

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Dear all, I have a set of unstructured points that lies on a surface. I want to create a surface, I am using below example: http://www.kwwidgets.com/Wiki/VTK/Examples/Cxx/Points/ExtractSurfaceDemo However the mesh is…

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## [Import multiple images using vtkImageImport](https://discourse.vtk.org/t/import-multiple-images-using-vtkimageimport/1991)

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**Author:** [@Yongun\_Lee](https://discourse.vtk.org/u/Yongun_Lee)\
**Replies:** 8\
**Last updated:** [November 4, 2019, 11:52pm UTC](https://discourse.vtk.org/t/import-multiple-images-using-vtkimageimport/1991 "2019-11-04T23:52:15Z")

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Hello. I have to implement MPR using VTK. With the help of my last question, I succeeded in converting PixelData (c-style) read with a third-party DicomReader to vtkImageData using vtkImageImport. However, I want to l…

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## [Smooth (Gouraud) shading disappears in 8.2](https://discourse.vtk.org/t/smooth-gouraud-shading-disappears-in-8-2/2017)

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**Author:** [@Jellby](https://discourse.vtk.org/u/Jellby)\
**Replies:** 13\
**Last updated:** [November 4, 2019, 4:33pm UTC](https://discourse.vtk.org/t/smooth-gouraud-shading-disappears-in-8-2/2017 "2019-11-04T16:33:30Z")

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I have an application working fine with python and VTK 8.1.2 (https://gitlab.com/Jellby/Pegamoid). Now I wanted to try something else (TTK), and I installed a new conda environment with vtk 8.2. The application still wo…

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