interacto…
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## [How to obtain faceID of a patch in VTK?](https://discourse.vtk.org/t/how-to-obtain-faceid-of-a-patch-in-vtk/5970)
**Author:** [@rasunag27](https://discourse.vtk.org/u/rasunag27)\
**Replies:** 1\
**Last updated:** [June 10, 2021, 3:54pm UTC](https://discourse.vtk.org/t/how-to-obtain-faceid-of-a-patch-in-vtk/5970 "2021-06-10T15:54:43Z")
Dear all, Is there a possibility to obtain FaceIDs of a particular patch? I have done a heat transfer simulation using OpenFoam, converted to VTK using vtkToFoam option and visualizing in paraview. When doing so,…
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## [CylinderExample vtkXOpenGLRenderWindow error in C++](https://discourse.vtk.org/t/cylinderexample-vtkxopenglrenderwindow-error-in-c/5953)
**Author:** [@felmoreno1726](https://discourse.vtk.org/u/felmoreno1726)\
**Replies:** 15\
**Last updated:** [June 9, 2021, 4:03pm UTC](https://discourse.vtk.org/t/cylinderexample-vtkxopenglrenderwindow-error-in-c/5953 "2021-06-09T16:03:10Z")
I’m running Ubuntu 20.04 on WSL. I succesfully compile the CylinderExample, and get the following errors at runtime. 2021-06-04 19:05:43.417 ( 0.009s) \[ A4169740\]vtkXOpenGLRenderWindow.:251 ERR| vtkXOpenGLR…
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## [vtkDecimatePro using vtkDataSet](https://discourse.vtk.org/t/vtkdecimatepro-using-vtkdataset/5956)
**Author:** [@Hyunwoo\_Kim](https://discourse.vtk.org/u/Hyunwoo_Kim)\
**Replies:** 7\
**Last updated:** [June 9, 2021, 2:47pm UTC](https://discourse.vtk.org/t/vtkdecimatepro-using-vtkdataset/5956 "2021-06-09T14:47:07Z")
Hi, I’m trying to use vtkDecimatePro for a surface mesh. An input data I use is a format of the vtkDataSet. However, the vtkDecimatePro seems to need a vtkPolyData format. I’ve already tried to vtkPolyData::safeDownC…
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## [vtkImageData rendering issue](https://discourse.vtk.org/t/vtkimagedata-rendering-issue/5966)
**Author:** [@Hyunwoo\_Kim](https://discourse.vtk.org/u/Hyunwoo_Kim)\
**Replies:** 1\
**Last updated:** [June 9, 2021, 5:15am UTC](https://discourse.vtk.org/t/vtkimagedata-rendering-issue/5966 "2021-06-09T05:15:40Z")
Issue Hi, I want to display a 2D image on my 3d view. So, I’m trying to use vtkImageData. However, when I apply scalar data and render the image data, there is no display. How could I fix this? thanks. Source /…
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## [VTK debug leaks with Visual studio 2013](https://discourse.vtk.org/t/vtk-debug-leaks-with-visual-studio-2013/5827)
**Author:** [@sateesh](https://discourse.vtk.org/u/sateesh)\
**Replies:** 13\
**Last updated:** [June 8, 2021, 3:21pm UTC](https://discourse.vtk.org/t/vtk-debug-leaks-with-visual-studio-2013/5827 "2021-06-08T15:21:35Z")
Hi, I have observed some strange behavior with “VTK debug leaks” in VS 2013. In a sample project made with VTK 8.1, I’m able to get the debug leaks in console when I close the application. But in Main project, unable …
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## [How can I export vtkImageSlice to .obj file](https://discourse.vtk.org/t/how-can-i-export-vtkimageslice-to-obj-file/5960)
**Author:** [@Uriel\_Dardik](https://discourse.vtk.org/u/Uriel_Dardik)\
**Replies:** 1\
**Last updated:** [June 8, 2021, 1:50pm UTC](https://discourse.vtk.org/t/how-can-i-export-vtkimageslice-to-obj-file/5960 "2021-06-08T13:50:34Z")
I’ve create a class that import/export .obj files to/from VTK object. import vtk DATA\_DIR = r"C:\\Users\\MyUser" class MyRenderer: def \_\_init\_\_(self): pass def import\_object(self, obj\_name): imp…
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## [Why does vtkRenderWindowInteractor eat up LeftButtonRelease event?](https://discourse.vtk.org/t/why-does-vtkrenderwindowinteractor-eat-up-leftbuttonrelease-event/5950)
**Author:** [@jaswantp](https://discourse.vtk.org/u/jaswantp)\
**Replies:** 6\
**Last updated:** [June 8, 2021, 1:30pm UTC](https://discourse.vtk.org/t/why-does-vtkrenderwindowinteractor-eat-up-leftbuttonrelease-event/5950 "2021-06-08T13:30:11Z")
@ken-martin @utkarshayachit There is no way to listen to LeftButtonReleaseEvent on an interactor. A quick google search shows up this, http://vtk.1045678.n5.nabble.com/Mouse-button-release-event-is-still-broken-in-VTK-…
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## [Unstructured Grids for Blender](https://discourse.vtk.org/t/unstructured-grids-for-blender/1959)
**Author:** [@tkeskita](https://discourse.vtk.org/u/tkeskita)\
**Replies:** 4\
**Last updated:** [June 8, 2021, 7:38am UTC](https://discourse.vtk.org/t/unstructured-grids-for-blender/1959 "2021-06-08T07:38:24Z")
Hello VTK users, I’m developing a Blender add-on for editing 3D volume meshes. I’ve just added experimental support (import and export) for VTK Unstructured Grid (.vtu) ASCII format to the add-on. If you are interested,…
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## [about RequestData](https://discourse.vtk.org/t/about-requestdata/5925)
**Author:** [@Hyunwoo\_Kim](https://discourse.vtk.org/u/Hyunwoo_Kim)\
**Replies:** 5\
**Last updated:** [June 4, 2021, 7:23pm UTC](https://discourse.vtk.org/t/about-requestdata/5925 "2021-06-04T19:23:53Z")
I’m trying to convert the VTK version from 5.0.3 to 9.0.1 In this process, the vtkPolydataSource was changed to the vtkPolydataAlgorithm. And I found that the Execute function was migrated to the RequestData, and It wa…
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## [Jest testcase writing](https://discourse.vtk.org/t/jest-testcase-writing/5877)
**Author:** [@Bhavika\_Thakkar](https://discourse.vtk.org/u/Bhavika_Thakkar)\
**Replies:** 6\
**Last updated:** [June 7, 2021, 4:37pm UTC](https://discourse.vtk.org/t/jest-testcase-writing/5877 "2021-06-07T16:37:06Z")
Hello I was trying to write testcases for the project which includes VTK JS. Project built in react. When I try to execute module which contains viewport it throws following error. It will be helpful if someonw can guid…
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## [3D objects are shifted after aligning along the vector](https://discourse.vtk.org/t/3d-objects-are-shifted-after-aligning-along-the-vector/5943)
**Author:** [@csad6517](https://discourse.vtk.org/u/csad6517)\
**Replies:** 0\
**Last updated:** [June 5, 2021, 7:54pm UTC](https://discourse.vtk.org/t/3d-objects-are-shifted-after-aligning-along-the-vector/5943 "2021-06-05T19:54:41Z")
I have several vtk poly data objects, equal in size that I want to align along a normalized direction vector centrically, shown on figure A. The vector below is calculated based on the three 3D points (red dots on figure…
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## [get the raw pointer from the vtkPoints](https://discourse.vtk.org/t/get-the-raw-pointer-from-the-vtkpoints/4894)
**Author:** [@1116](https://discourse.vtk.org/u/1116)\
**Replies:** 19\
**Last updated:** [June 4, 2021, 10:01pm UTC](https://discourse.vtk.org/t/get-the-raw-pointer-from-the-vtkpoints/4894 "2021-06-04T22:01:00Z")
Hello, I tried to get the raw pointer of vtkPoints and send it to other services. But it looks that the return value of GetVoidPointer is incorrect. This is the code I used for testing, although I could go through every…
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## [SafeDownCast and subclassing vtkPolyData in Python](https://discourse.vtk.org/t/safedowncast-and-subclassing-vtkpolydata-in-python/5912)
**Author:** [@bistek](https://discourse.vtk.org/u/bistek)\
**Replies:** 10\
**Last updated:** [June 4, 2021, 10:48am UTC](https://discourse.vtk.org/t/safedowncast-and-subclassing-vtkpolydata-in-python/5912 "2021-06-04T10:48:52Z")
Hello, I have defined a subclass of vtkPolyData in my Python project. It works well and I am able to use standard vtkXMLPolyDataWriter to save it to disk. However, when reloading the objects from file, I would like to ca…
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## [unsuitable gl2ps and libharu version](https://discourse.vtk.org/t/unsuitable-gl2ps-and-libharu-version/2906)
**Author:** [@hubutui](https://discourse.vtk.org/u/hubutui)\
**Replies:** 7\
**Last updated:** [June 4, 2021, 12:50am UTC](https://discourse.vtk.org/t/unsuitable-gl2ps-and-libharu-version/2906 "2021-06-04T00:50:52Z")
cmake complains unsuitable version of gl2ps and libharu. cmake says vtk needs gl2ps 1.4.1 but found 1.4.0, and vtk needs libhairu 2.4.0 but found 2.3.0 . However, according to http://geuz.org/gl2ps/ and http://libharu.or…
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## [Align poly data to direction vector](https://discourse.vtk.org/t/align-poly-data-to-direction-vector/5927)
**Author:** [@csad6517](https://discourse.vtk.org/u/csad6517)\
**Replies:** 3\
**Last updated:** [June 3, 2021, 6:52pm UTC](https://discourse.vtk.org/t/align-poly-data-to-direction-vector/5927 "2021-06-03T18:52:11Z")
I represent a vtk poly data object that I read with vtkPlyReader and want to align it to given normalized direction vector, so that its orientation matches with that vector. directionVector = np.array(\[-0.1134, -0.0695,…
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## [VolumeController widget function](https://discourse.vtk.org/t/volumecontroller-widget-function/5911)
**Author:** [@Julia](https://discourse.vtk.org/u/Julia)\
**Replies:** 1\
**Last updated:** [June 3, 2021, 3:58pm UTC](https://discourse.vtk.org/t/volumecontroller-widget-function/5911 "2021-06-03T15:58:34Z")
Hi, The VolumeController of vtk.js looks like this: In the lower box, a sort of grey sort of mountain landshape is displayed in the background. I noticed that this is different for each data. Does someone know what t…
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## [wglMakeCurrent failed in MakeCurrent after closed a window with two vtk widget.](https://discourse.vtk.org/t/wglmakecurrent-failed-in-makecurrent-after-closed-a-window-with-two-vtk-widget/5899)
**Author:** [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)\
**Replies:** 1\
**Last updated:** [June 3, 2021, 11:58am UTC](https://discourse.vtk.org/t/wglmakecurrent-failed-in-makecurrent-after-closed-a-window-with-two-vtk-widget/5899 "2021-06-03T11:58:58Z")
I create a window, in which I add two vtk widget. The window is OK. But, if I close the winodw, a bug is reporeted: ... 2021-06-01 20:53:09.231 ( 3.482s) \[ \]vtkWin32OpenGLRenderWin:217 ERR| vtkWin32…
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## [vtk chart background shifted towards origin](https://discourse.vtk.org/t/vtk-chart-background-shifted-towards-origin/5890)
**Author:** [@dcbr](https://discourse.vtk.org/u/dcbr)\
**Replies:** 4\
**Last updated:** [June 3, 2021, 8:55am UTC](https://discourse.vtk.org/t/vtk-chart-background-shifted-towards-origin/5890 "2021-06-03T08:55:16Z")
Hi there, I was trying out the vtk Charts API in python, following the examples on the wiki (ChartsOn3DScene and LinePlot). I tried to create two charts in the same context scene and would like to use a different backgr…
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## [NetCdf reader](https://discourse.vtk.org/t/netcdf-reader/5922)
**Author:** [@Ko-Chih\_Wang](https://discourse.vtk.org/u/Ko-Chih_Wang)\
**Replies:** 0\
**Last updated:** [June 3, 2021, 7:47am UTC](https://discourse.vtk.org/t/netcdf-reader/5922 "2021-06-03T07:47:59Z")
Hi, does vtk.js support NetCdf reader, such as this one in VTK https://vtk.org/doc/nightly/html/classvtkNetCDFReader.html One more question is… I am new in vtk.js. Is there any API document for vtk.js? (it is a little…
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## [The world coordinate is changed when the shown image is rotated.](https://discourse.vtk.org/t/the-world-coordinate-is-changed-when-the-shown-image-is-rotated/5879)
**Author:** [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)\
**Replies:** 13\
**Last updated:** [June 2, 2021, 4:06pm UTC](https://discourse.vtk.org/t/the-world-coordinate-is-changed-when-the-shown-image-is-rotated/5879 "2021-06-02T16:06:37Z")
I want to know how to calculate the image pixel coordinate fro world coordinate. The code of my experiment is: import vtk import numpy as np from vtk.util.numpy\_support import numpy\_to\_vtk def numpyToVTK(data, multi\_com…
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## [Box clip with vtkTableBasedClipDataSet](https://discourse.vtk.org/t/box-clip-with-vtktablebasedclipdataset/5906)
**Author:** [@KeK](https://discourse.vtk.org/u/KeK)\
**Replies:** 0\
**Last updated:** [June 2, 2021, 2:21am UTC](https://discourse.vtk.org/t/box-clip-with-vtktablebasedclipdataset/5906 "2021-06-02T02:21:33Z")
I’m trying to clip an unstructuredgrid using vtkTableBasedClipDataSet. I use the unstructuredgrid as the input of vtkTableBasedClipDataSet and vtkbox as the clip function. The result doesn’t look like it’s interpo…
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## [issue about converting VTK 5.0.3 codes to VTK 9.0.1.](https://discourse.vtk.org/t/issue-about-converting-vtk-5-0-3-codes-to-vtk-9-0-1/5875)
**Author:** [@Hyunwoo\_Kim](https://discourse.vtk.org/u/Hyunwoo_Kim)\
**Replies:** 1\
**Last updated:** [May 27, 2021, 2:46pm UTC](https://discourse.vtk.org/t/issue-about-converting-vtk-5-0-3-codes-to-vtk-9-0-1/5875 "2021-05-27T14:46:59Z")
Hi, I have an old project which uses VTK 5.0.3 version. And I’d like to make that version up to date. Therefore, I’m trying to convert VTK 5.0.3 codes to VTK 9.0.1. However, I’m struggling with two classes that were …
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## [Create an isosurface from parallel contours](https://discourse.vtk.org/t/create-an-isosurface-from-parallel-contours/5909)
**Author:** [@Miguel\_Socorro](https://discourse.vtk.org/u/Miguel_Socorro)\
**Replies:** 1\
**Last updated:** [June 2, 2021, 9:35am UTC](https://discourse.vtk.org/t/create-an-isosurface-from-parallel-contours/5909 "2021-06-02T09:35:22Z")
I need to create an isosurface from these 4 contours each contour is on a plane and the planes are parallel, therefore the 4 contours are parallel. I tried a solution similar to this Stitches But contour 3 has seve…
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## [GPU offload](https://discourse.vtk.org/t/gpu-offload/5898)
**Author:** [@pourarab](https://discourse.vtk.org/u/pourarab)\
**Replies:** 2\
**Last updated:** [June 2, 2021, 8:45am UTC](https://discourse.vtk.org/t/gpu-offload/5898 "2021-06-02T08:45:53Z")
Hello, I’m investigating using OpenMP GPU offload to run vtkCellTreeLocator-\>FindCellsWithinBounds on GPU. Is it possible to map it via OpenMP ? If not, is there any solution to do it as parallel execution on GPUs ? Th…
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## [vtkImageReslice usage](https://discourse.vtk.org/t/vtkimagereslice-usage/5887)
**Author:** [@dani](https://discourse.vtk.org/u/dani)\
**Replies:** 1\
**Last updated:** [June 1, 2021, 8:50pm UTC](https://discourse.vtk.org/t/vtkimagereslice-usage/5887 "2021-06-01T20:50:24Z")
Dear all, I am having some doubts on vtkImageReslice. I am working in python. I would like not just to resample the image but also to crop the result to a box of size (10,10,20) centered in the origin (the box is much s…
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## [Voxelization with image data](https://discourse.vtk.org/t/voxelization-with-image-data/5903)
**Author:** [@gaston-perret](https://discourse.vtk.org/u/gaston-perret)\
**Replies:** 0\
**Last updated:** [June 1, 2021, 5:52pm UTC](https://discourse.vtk.org/t/voxelization-with-image-data/5903 "2021-06-01T17:52:38Z")
Hello, we are using the VTK JS library and we need to get voxel representations of images stored in vti files. Something like what is done here but with the vtk cpp and python: https://kitware.github.io/vtk-examples/sit…
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## [Individual label colors with vtkPointSetToLabelHierarchy](https://discourse.vtk.org/t/individual-label-colors-with-vtkpointsettolabelhierarchy/5901)
**Author:** [@Peter](https://discourse.vtk.org/u/Peter)\
**Replies:** 0\
**Last updated:** [June 1, 2021, 1:11pm UTC](https://discourse.vtk.org/t/individual-label-colors-with-vtkpointsettolabelhierarchy/5901 "2021-06-01T13:11:12Z")
Hi! I am using the following pipeline to show labels at certain 3D positions. No labels are shown for invisible positions (hidden by another object in the scene). vtkUnstructuredGrid | vtkSelectVisiblePoints | vtkPoin…
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