# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=47

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

**Page:** 48

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## [VTK update 3D PointCloud too slow !](https://discourse.vtk.org/t/vtk-update-3d-pointcloud-too-slow/11677)

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**Author:** [@hang.wang](https://discourse.vtk.org/u/hang.wang)\
**Replies:** 0\
**Last updated:** [June 12, 2023, 6:25am UTC](https://discourse.vtk.org/t/vtk-update-3d-pointcloud-too-slow/11677 "2023-06-12T06:25:47Z")

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I use the VTK-7.1 and PCL 1.10 and Qt 5.12.8 to show 3D point cloud, it show’s normally the viewer can update everytimes. after I update VTK from 7.1 to 9.2.6, and PCL from 1.10 to 1.13 and Qt from 5 to 6, this problem h…

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## [Set initial position for vtkOrientationMarkerWidget after camera rotation](https://discourse.vtk.org/t/set-initial-position-for-vtkorientationmarkerwidget-after-camera-rotation/11673)

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**Author:** [@bryan](https://discourse.vtk.org/u/bryan)\
**Replies:** 0\
**Last updated:** [June 12, 2023, 2:10am UTC](https://discourse.vtk.org/t/set-initial-position-for-vtkorientationmarkerwidget-after-camera-rotation/11673 "2023-06-12T02:10:39Z")

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I have embedded the vtkOrientationMarkerWidget to a viewer to indicate the orientation of an image volume. The viewer allows interactive rotation of the camera and displays the image volume accordingly while the widget i…

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## [PointCloud rendering](https://discourse.vtk.org/t/pointcloud-rendering/11662)

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**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 5\
**Last updated:** [June 11, 2023, 4:55pm UTC](https://discourse.vtk.org/t/pointcloud-rendering/11662 "2023-06-11T16:55:18Z")

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This is probably a matter of a single property on the actor, but I cannot figure it out. I am doing some point cloud rendering, but displaying vtkPolyData. There is no black points, but all points appear blackish on…

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## [How to put a mirron on the scene](https://discourse.vtk.org/t/how-to-put-a-mirron-on-the-scene/11667)

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**Author:** [@mtarpit](https://discourse.vtk.org/u/mtarpit)\
**Replies:** 1\
**Last updated:** [June 11, 2023, 2:01pm UTC](https://discourse.vtk.org/t/how-to-put-a-mirron-on-the-scene/11667 "2023-06-11T14:01:10Z")

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Hi there, I would like to create a scene where an object is reflected on a mirror and the camera captures both the object and its reflection on the mirror. So far I experimented with the Python binding of VTK, but I co…

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## [how to determine the pre-contrast and post-contrast through series time, acquisition time and content time in DCE-MRI dicom images](https://discourse.vtk.org/t/how-to-determine-the-pre-contrast-and-post-contrast-through-series-time-acquisition-time-and-content-time-in-dce-mri-dicom-images/11661)

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**Author:** [@Ian\_Ben](https://discourse.vtk.org/u/Ian_Ben)\
**Replies:** 2\
**Last updated:** [June 11, 2023, 7:09am UTC](https://discourse.vtk.org/t/how-to-determine-the-pre-contrast-and-post-contrast-through-series-time-acquisition-time-and-content-time-in-dce-mri-dicom-images/11661 "2023-06-11T07:09:46Z")

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I was studying the DCE-MRI image on Multi-center breast DCE-MRI data and segmentations from patients in the I-SPY 1/ACRIN 6657 trials (ISPY1) - The Cancer Imaging Archive (TCIA) Public Access - Cancer Imaging Archive Wik…

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## [Control over the block representation style (surface, points, wireframe, etc.)](https://discourse.vtk.org/t/control-over-the-block-representation-style-surface-points-wireframe-etc/11630)

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**Author:** [@anooja](https://discourse.vtk.org/u/anooja)\
**Replies:** 2\
**Last updated:** [June 9, 2023, 7:02pm UTC](https://discourse.vtk.org/t/control-over-the-block-representation-style-surface-points-wireframe-etc/11630 "2023-06-09T19:02:18Z")

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Is there any way to control over the individual block representation style (surface, wireframe , points etc.) like block opacity , block color and block visibility instead of setting actor representation style.

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## [Trying to run VTK example but failed in Cmake --build stage](https://discourse.vtk.org/t/trying-to-run-vtk-example-but-failed-in-cmake-build-stage/11638)

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**Author:** [@lake\_lagunita](https://discourse.vtk.org/u/lake_lagunita)\
**Replies:** 10\
**Last updated:** [June 9, 2023, 5:24pm UTC](https://discourse.vtk.org/t/trying-to-run-vtk-example-but-failed-in-cmake-build-stage/11638 "2023-06-09T17:24:16Z")

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I am a new learner of VTK and I am trying to learn VTK by its examples. I’ve installed VTK and put the “C:\\Program Files\\VTK\\bin” as environment parameter. However when I tried to build one VTK example I failed at Cmake …

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## [How to Colorize the Reconstructed Surface of Point Clouds Using Scalar Values?](https://discourse.vtk.org/t/how-to-colorize-the-reconstructed-surface-of-point-clouds-using-scalar-values/11635)

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**Author:** [@guyqqcom](https://discourse.vtk.org/u/guyqqcom)\
**Replies:** 1\
**Last updated:** [June 9, 2023, 1:32pm UTC](https://discourse.vtk.org/t/how-to-colorize-the-reconstructed-surface-of-point-clouds-using-scalar-values/11635 "2023-06-09T13:32:58Z")

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I have a set of three-dimensional point clouds with associated scalar values. I want to perform surface reconstruction using these point clouds and then color the surface based on the scalar values of each point. However…

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## [\[javascript\] vtkRenderWindowInteractor doesn't have the function addObserver](https://discourse.vtk.org/t/javascript-vtkrenderwindowinteractor-doesnt-have-the-function-addobserver/11624)

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**Author:** [@Alex\_Vergara](https://discourse.vtk.org/u/Alex_Vergara)\
**Replies:** 4\
**Last updated:** [June 9, 2023, 11:37am UTC](https://discourse.vtk.org/t/javascript-vtkrenderwindowinteractor-doesnt-have-the-function-addobserver/11624 "2023-06-09T11:37:36Z")

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I want to associate a mousemove event handler to an interactor. this is done in python as renderWindowInteractor = vtk.vtkRenderWindowInteractor() renderWindowInteractor.AddObserver("MouseMoveEvent", mousemove) The pro…

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## [vtkCaptionWidget interferes with Qt C++ Application quit](https://discourse.vtk.org/t/vtkcaptionwidget-interferes-with-qt-c-application-quit/9936)

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**Author:** [@Manju](https://discourse.vtk.org/u/Manju)\
**Replies:** 15\
**Last updated:** [June 8, 2023, 8:12pm UTC](https://discourse.vtk.org/t/vtkcaptionwidget-interferes-with-qt-c-application-quit/9936 "2023-06-08T20:12:47Z")

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I am using vtkCaptionWidget to annotate the 2D image loaded in qvtkwidget. However once the caption widget is placed on the image QApplication::exit(0) doesn’t work. Even if the window is closed by calling close() functi…

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## [How to Reset VTKDistance Widget/ Distance Representation to make a new measurement in a renderer](https://discourse.vtk.org/t/how-to-reset-vtkdistance-widget-distance-representation-to-make-a-new-measurement-in-a-renderer/11646)

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**Author:** [@Pereiraplox](https://discourse.vtk.org/u/Pereiraplox)\
**Replies:** 0\
**Last updated:** [June 8, 2023, 4:51pm UTC](https://discourse.vtk.org/t/how-to-reset-vtkdistance-widget-distance-representation-to-make-a-new-measurement-in-a-renderer/11646 "2023-06-08T16:51:22Z")

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Hi I have an app where after pressing a button it enables the vtk distance widget on my renderer. By pressing it again I can turn it off. However, when I press the button again my wiget reappears with the previous measur…

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## [Trouble debugging HighlightPickedActor example](https://discourse.vtk.org/t/trouble-debugging-highlightpickedactor-example/2718)

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**Author:** [@awa5114](https://discourse.vtk.org/u/awa5114)\
**Replies:** 2\
**Last updated:** [June 8, 2023, 2:09pm UTC](https://discourse.vtk.org/t/trouble-debugging-highlightpickedactor-example/2718 "2023-06-08T14:09:18Z")

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I was able to successfully build and install vtk on Visual Studio 2019 thanks to various resources: https://gitlab.kitware.com/vtk/vtk/blob/master/Documentation/dev/build.md https://gitlab.kitware.com/vtk/vtk/blob/mast…

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## [vtkCesium3DTilesWriter - explanation of parameters](https://discourse.vtk.org/t/vtkcesium3dtileswriter-explanation-of-parameters/11622)

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**Author:** [@bistek](https://discourse.vtk.org/u/bistek)\
**Replies:** 1\
**Last updated:** [June 8, 2023, 1:31am UTC](https://discourse.vtk.org/t/vtkcesium3dtileswriter-explanation-of-parameters/11622 "2023-06-08T01:31:12Z")

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Hello I’m looking for some information about vtkCesium3DTilesWriter. Particularly an explanation on the input parameters would be useful, and a list of required vs optional parameters. These are the only pages I was abl…

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## [std::mutex incompatible with C++/CLI](https://discourse.vtk.org/t/std-mutex-incompatible-with-c-cli/11050)

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**Author:** [@macadata](https://discourse.vtk.org/u/macadata)\
**Replies:** 4\
**Last updated:** [June 7, 2023, 9:42pm UTC](https://discourse.vtk.org/t/std-mutex-incompatible-with-c-cli/11050 "2023-06-07T21:42:04Z")

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I’m upgrading a C++/CLI .NET application from VTK 8.1 to 9.2.6. I’m now getting many compile errors: fatal error C1189: #error: \<mutex\> is not supported when compiling with /clr or /clr:pure. …which I’ve tracked do…

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## [\[javascript\] Get the cellID having the pointID](https://discourse.vtk.org/t/javascript-get-the-cellid-having-the-pointid/11615)

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**Author:** [@Alex\_Vergara](https://discourse.vtk.org/u/Alex_Vergara)\
**Replies:** 4\
**Last updated:** [June 7, 2023, 3:41pm UTC](https://discourse.vtk.org/t/javascript-get-the-cellid-having-the-pointid/11615 "2023-06-07T15:41:18Z")

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Hello I know the existence of the function let cellIds = polydata.getPointCells(i, vtkTriangle);, where “i” is the pointId. I expect a list of cellIds as output (all cells than contain the point i), but this is not the …

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## [ActiViz 9.2 vtkRenderWindowInteractor LeftButtonDoubleClickEvt not triggered](https://discourse.vtk.org/t/activiz-9-2-vtkrenderwindowinteractor-leftbuttondoubleclickevt-not-triggered/11621)

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**Author:** [@a772485252](https://discourse.vtk.org/u/a772485252)\
**Replies:** 0\
**Last updated:** [June 7, 2023, 5:57am UTC](https://discourse.vtk.org/t/activiz-9-2-vtkrenderwindowinteractor-leftbuttondoubleclickevt-not-triggered/11621 "2023-06-07T05:57:41Z")

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Iren.LeftButtonDoubleClickEvt +=Iren\_LeftButtonDoubleClickEvt ; private void Iren\_LeftButtonDoubleClickEvt (vtkObject sender,vtkObjectEventArg e) { //do something }

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## [VtkCutter : unexplained behaviour](https://discourse.vtk.org/t/vtkcutter-unexplained-behaviour/11607)

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**Author:** [@raphael-bresson](https://discourse.vtk.org/u/raphael-bresson)\
**Replies:** 6\
**Last updated:** [June 5, 2023, 12:22pm UTC](https://discourse.vtk.org/t/vtkcutter-unexplained-behaviour/11607 "2023-06-05T12:22:57Z")

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Hi everyone, I noticed a behavior of the vtkCutter filter that I can’t explain. Let’s say I have a very basic planar polydata mesh of 5x5 quads (100m x 100m each) with a hole in the middle. See attachment mesh.vtk (1.…

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## [QVTKOpenGLStereoWidget customContextMenuRequested not work](https://discourse.vtk.org/t/qvtkopenglstereowidget-customcontextmenurequested-not-work/6124)

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**Author:** [@evgen](https://discourse.vtk.org/u/evgen)\
**Replies:** 1\
**Last updated:** [June 4, 2023, 5:58am UTC](https://discourse.vtk.org/t/qvtkopenglstereowidget-customcontextmenurequested-not-work/6124 "2023-06-04T05:58:26Z")

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I am migrating my app from vtk 8.1 to vtk 9.0. In vtk 9 QVTKOpenGLWidget is replaced with QVTKOpenGLStereoWidget. To create a context menu in vtk 8.1 I used the code: m\_View-\>setContextMenuPolicy(Qt::CustomContextMenu); …

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## [Volume rendering without clothes obstruction](https://discourse.vtk.org/t/volume-rendering-without-clothes-obstruction/11601)

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**Author:** [@lkuan](https://discourse.vtk.org/u/lkuan)\
**Replies:** 1\
**Last updated:** [June 2, 2023, 7:40pm UTC](https://discourse.vtk.org/t/volume-rendering-without-clothes-obstruction/11601 "2023-06-02T19:40:27Z")

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The image is shown in axial view. I am a beginner in VTK. I have achieved to visulize the airway and lung with VTK by using volume rendering. I set some brightness indexes to change opacity and gradientopacity. The …

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## [vtkNIFTIWriter changes imagedata coordinate automatically](https://discourse.vtk.org/t/vtkniftiwriter-changes-imagedata-coordinate-automatically/11593)

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**Author:** [@veltia](https://discourse.vtk.org/u/veltia)\
**Replies:** 2\
**Last updated:** [June 2, 2023, 9:43am UTC](https://discourse.vtk.org/t/vtkniftiwriter-changes-imagedata-coordinate-automatically/11593 "2023-06-02T09:43:59Z")

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Hi all, I’m having a trouble of imagedata transforming, it seems will change coordinate information automatically after I save it as .nii file and read it again. Here is my steps: read dicom series. use vtkImageReslic…

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## [Visualize DTI tensor image](https://discourse.vtk.org/t/visualize-dti-tensor-image/11595)

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**Author:** [@Peter](https://discourse.vtk.org/u/Peter)\
**Replies:** 1\
**Last updated:** [June 1, 2023, 4:33pm UTC](https://discourse.vtk.org/t/visualize-dti-tensor-image/11595 "2023-06-01T16:33:43Z")

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Hello, I have a NIFTI file with estimated DTI tensors consisting of 6 volumes (for each element of the diffusion tensor). I used “vtkNIFTIImageReader” with “TimeAsVectorOn” and received the image data, whereby the point…

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## [About vtkWindowToImageFilter](https://discourse.vtk.org/t/about-vtkwindowtoimagefilter/11592)

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**Author:** [@Theron](https://discourse.vtk.org/u/Theron)\
**Replies:** 0\
**Last updated:** [June 1, 2023, 9:01am UTC](https://discourse.vtk.org/t/about-vtkwindowtoimagefilter/11592 "2023-06-01T09:01:15Z")

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I use vtkWindowToImageFilter to extract content of a rendering window by renderWindows-\>Render() vtkSmartPointer imageFilters = vtkSmartPointer::New(); imageFilters-\>SetInput(renderWindows); imageFilters-\>Modified(); …

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## [Background color always black](https://discourse.vtk.org/t/background-color-always-black/7516)

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**Author:** [@Julienchz](https://discourse.vtk.org/u/Julienchz)\
**Replies:** 14\
**Last updated:** [June 1, 2023, 7:07am UTC](https://discourse.vtk.org/t/background-color-always-black/7516 "2023-06-01T07:07:36Z")

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Hi, I am using a QQuickVtkRenderWindow inside a bigger software with a smaller QQuickVtkRenderItem. I changed the background color of the QQuickVtkRenderItem no problem… but the QQuickVtkRenderWindow is still black… and …

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## [Is it possible to change the labels of vtkCameraOrientationWidget from X,Y,Z to U,V,N?](https://discourse.vtk.org/t/is-it-possible-to-change-the-labels-of-vtkcameraorientationwidget-from-x-y-z-to-u-v-n/7620)

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**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 3\
**Last updated:** [June 1, 2023, 4:24am UTC](https://discourse.vtk.org/t/is-it-possible-to-change-the-labels-of-vtkcameraorientationwidget-from-x-y-z-to-u-v-n/7620 "2023-06-01T04:24:00Z")

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For vtkAxesActor,there is a bunch of methods like:SetXAxisLabelText can be used to change the text.Is there any counterpart for vtkCameraOrientationWidget to do same thing?

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## [How to generate less triangles for polygon triangulation?](https://discourse.vtk.org/t/how-to-generate-less-triangles-for-polygon-triangulation/11562)

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**Author:** [@gongwaner](https://discourse.vtk.org/u/gongwaner)\
**Replies:** 9\
**Last updated:** [May 31, 2023, 6:05pm UTC](https://discourse.vtk.org/t/how-to-generate-less-triangles-for-polygon-triangulation/11562 "2023-05-31T18:05:59Z")

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Given a set of planar points in 3d space(vector3d), I can make a polygon. To triangulate the polygon, there are many options. I used vtkTriangleFilter. It’s quite fast and robust, the only problem is that output of vtkT…

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## [help setting Manipulator Style](https://discourse.vtk.org/t/help-setting-manipulator-style/11583)

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**Author:** [@Alex\_Vergara](https://discourse.vtk.org/u/Alex_Vergara)\
**Replies:** 1\
**Last updated:** [May 31, 2023, 3:20pm UTC](https://discourse.vtk.org/t/help-setting-manipulator-style/11583 "2023-05-31T15:20:37Z")

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Hello I need help setting a specific Manipulator style in vtk.js, so far I have written function getInteractorStyle(){ // Interactor (view https://kitware.github.io/vtk-js/examples/InteractorStyleManipulator.html) …

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## [Combining vtkVolume with vtkImageActor - opacity issues](https://discourse.vtk.org/t/combining-vtkvolume-with-vtkimageactor-opacity-issues/11582)

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**Author:** [@mortifiedpenguin](https://discourse.vtk.org/u/mortifiedpenguin)\
**Replies:** 1\
**Last updated:** [May 31, 2023, 10:06am UTC](https://discourse.vtk.org/t/combining-vtkvolume-with-vtkimageactor-opacity-issues/11582 "2023-05-31T10:06:17Z")

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I’m visualizing a CT dataset as a vtkVolume. Then, I display an arbitrary oblique slice in the dataset. This works fine with vtkReslice and vtkImageActor, setting the position and orientation. However, it seems that the …

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## [Pyvista subplot with VRML](https://discourse.vtk.org/t/pyvista-subplot-with-vrml/11568)

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**Author:** [@simon.rit](https://discourse.vtk.org/u/simon.rit)\
**Replies:** 5\
**Last updated:** [May 30, 2023, 4:30pm UTC](https://discourse.vtk.org/t/pyvista-subplot-with-vrml/11568 "2023-05-30T16:30:50Z")

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I am trying to use Pyvista to plot two VRML files next to each other using Pyvista’s subplot. However, the two files are overlaid on each other in the first subplot, as shown with the teapot and sextant files with the fo…

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## [contour filter algorithm](https://discourse.vtk.org/t/contour-filter-algorithm/11556)

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**Author:** [@danpak94](https://discourse.vtk.org/u/danpak94)\
**Replies:** 6\
**Last updated:** [May 30, 2023, 3:20pm UTC](https://discourse.vtk.org/t/contour-filter-algorithm/11556 "2023-05-30T15:20:48Z")

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Hello, I have been using vtkContourFilter quite frequently to generate surface meshes from SDF. From what I understand, there are other options for the contour method, like vtkMarchingCubes and vtkFlyingEdges3D. Marchi…

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## [how to expand a polydata?](https://discourse.vtk.org/t/how-to-expand-a-polydata/11570)

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**Author:** [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)\
**Replies:** 3\
**Last updated:** [May 30, 2023, 1:08pm UTC](https://discourse.vtk.org/t/how-to-expand-a-polydata/11570 "2023-05-30T13:08:56Z")

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For example, I have a polydata: the black object in the following figure. Then, I hope to expand it, and I expect the result is the red object. The hole in the black object would disappear in the red object. A possib…

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