# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=88

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

**Page:** 89

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## [Problem using release build and mac build of vtk java wrapping](https://discourse.vtk.org/t/problem-using-release-build-and-mac-build-of-vtk-java-wrapping/7369)

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**Author:** [@taol8](https://discourse.vtk.org/u/taol8)\
**Replies:** 0\
**Last updated:** [December 8, 2021, 12:47pm UTC](https://discourse.vtk.org/t/problem-using-release-build-and-mac-build-of-vtk-java-wrapping/7369 "2021-12-08T12:47:17Z")

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Hello all, First of all, my apologies if this question has already been asked and/or resolved, but I haven’t seen anyone else with the same issue as I have. I’ve been using the vtk java wrapping to develop a plugin on …

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## [vtkVRMLImporter incorrectly displays the result of the import](https://discourse.vtk.org/t/vtkvrmlimporter-incorrectly-displays-the-result-of-the-import/7358)

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**Author:** [@DX130](https://discourse.vtk.org/u/DX130)\
**Replies:** 1\
**Last updated:** [December 8, 2021, 8:19am UTC](https://discourse.vtk.org/t/vtkvrmlimporter-incorrectly-displays-the-result-of-the-import/7358 "2021-12-08T08:19:25Z")

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hello, I have some trouble importing files using vtkVRMLImporter.The details are as follows This is the exported reconstruction result This is the imported reconstruction result I also cannot modify any camera pr…

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## [vtkRenderer and vtkRenderWindow have different size when inside wxVTKRenderWindowInteractor](https://discourse.vtk.org/t/vtkrenderer-and-vtkrenderwindow-have-different-size-when-inside-wxvtkrenderwindowinteractor/7362)

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**Author:** [@brogos](https://discourse.vtk.org/u/brogos)\
**Replies:** 0\
**Last updated:** [December 8, 2021, 2:17am UTC](https://discourse.vtk.org/t/vtkrenderer-and-vtkrenderwindow-have-different-size-when-inside-wxvtkrenderwindowinteractor/7362 "2021-12-08T02:17:58Z")

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Hi, I was doing some testing with VTK and WXPython in a MacBook Air M1. I’m using VTK 9.1.0 and WXPython 4.1.1. One thing that I noticed is vtkRenderer and vtkRenderWindow when inside a wxVTKRenderWindowInteractor have t…

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## [How to use original OpenGL in VTK program?](https://discourse.vtk.org/t/how-to-use-original-opengl-in-vtk-program/4636)

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**Author:** [@xyh](https://discourse.vtk.org/u/xyh)\
**Replies:** 7\
**Last updated:** [December 7, 2021, 8:42pm UTC](https://discourse.vtk.org/t/how-to-use-original-opengl-in-vtk-program/4636 "2021-12-07T20:42:56Z")

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I am new to vtk, can you tell me how to use vtk and opengl in the one window (such as QVTKOpenGLWindow)? For examle, there is a cube painted by vtk, how to add a triangle by opengl in same window? Thanks.

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## [the speed is too slow for vtkWindowToImageFilter, how to speed it?](https://discourse.vtk.org/t/the-speed-is-too-slow-for-vtkwindowtoimagefilter-how-to-speed-it/2396)

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**Author:** [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)\
**Replies:** 15\
**Last updated:** [December 7, 2021, 6:27pm UTC](https://discourse.vtk.org/t/the-speed-is-too-slow-for-vtkwindowtoimagefilter-how-to-speed-it/2396 "2021-12-07T18:27:47Z")

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Currently, we need to use vtk in my project. We want to obtain the off sreen rendering picture and show it. We use vtkWindowToImageFilter to obtain the rendering picture. However, we find it’s too slow. My code is: from…

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## [Quickly access points of a vtkPoints with vtkIdType](https://discourse.vtk.org/t/quickly-access-points-of-a-vtkpoints-with-vtkidtype/7354)

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**Author:** [@Julienchz](https://discourse.vtk.org/u/Julienchz)\
**Replies:** 0\
**Last updated:** [December 7, 2021, 11:39am UTC](https://discourse.vtk.org/t/quickly-access-points-of-a-vtkpoints-with-vtkidtype/7354 "2021-12-07T11:39:04Z")

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Hello, I have a vtkIdTypeArray or a vtkIdList referring to points inside a vtkPoints, how can I access quickly those points to render them without using vtkSelectionNode (too long with a large pointcloud) ? Thanks for …

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## [Send progress through web socket](https://discourse.vtk.org/t/send-progress-through-web-socket/7345)

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**Author:** [@no2497](https://discourse.vtk.org/u/no2497)\
**Replies:** 3\
**Last updated:** [December 6, 2021, 6:41pm UTC](https://discourse.vtk.org/t/send-progress-through-web-socket/7345 "2021-12-06T18:41:58Z")

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Hi While reading my DICOM series I want to send a message to the server notifying the current progress of the reading. I found out that there is the .addObserver() method which allows to register some events of a vtkObj…

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## [A question about vtkStructuredGrid](https://discourse.vtk.org/t/a-question-about-vtkstructuredgrid/7318)

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**Author:** [@KeyboardMan](https://discourse.vtk.org/u/KeyboardMan)\
**Replies:** 11\
**Last updated:** [December 6, 2021, 6:00pm UTC](https://discourse.vtk.org/t/a-question-about-vtkstructuredgrid/7318 "2021-12-06T18:00:18Z")

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I try to use vtkStructuredGrid to draw the grid in the polar coordinate system。But the hexahedral cell in vtkCellType is not fan-shaped。 I found this when I was looking for information（like c）, but it didn’t explain h…

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## [Why is there no color in the scene I exported with vtkVRMLExporter](https://discourse.vtk.org/t/why-is-there-no-color-in-the-scene-i-exported-with-vtkvrmlexporter/7344)

<div class="topic-metadata">

**Author:** [@DX130](https://discourse.vtk.org/u/DX130)\
**Replies:** 1\
**Last updated:** [December 6, 2021, 3:39pm UTC](https://discourse.vtk.org/t/why-is-there-no-color-in-the-scene-i-exported-with-vtkvrmlexporter/7344 "2021-12-06T15:39:20Z")

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I want to export the result, but there is always no correct color after opening it with ParaView. If you have any other suggestions please let me know. polydata = vtkAppendPolyData() reader = vtkNIFTIImageReader() …

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## [Cannot perform a minimal build from master without Parallel modules](https://discourse.vtk.org/t/cannot-perform-a-minimal-build-from-master-without-parallel-modules/7298)

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**Author:** [@biagas](https://discourse.vtk.org/u/biagas)\
**Replies:** 3\
**Last updated:** [December 4, 2021, 4:31pm UTC](https://discourse.vtk.org/t/cannot-perform-a-minimal-build-from-master-without-parallel-modules/7298 "2021-12-04T16:31:21Z")

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I am performing a minimal build of VTK master with these initial cache settings: BUILD\_SHARED\_LIBS:BOOL=true VTK\_LEGACY\_REMOVE:BOOL=true VTK\_DATA\_EXCLUDE\_FROM\_ALL:BOOL=true VTK\_FORBID\_DOWNLOADS:BOOL=true VTK\_DEBUG\_MODU…

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## [Filter for deleting isolated voxels](https://discourse.vtk.org/t/filter-for-deleting-isolated-voxels/7328)

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**Author:** [@gaston-perret](https://discourse.vtk.org/u/gaston-perret)\
**Replies:** 1\
**Last updated:** [December 3, 2021, 10:12pm UTC](https://discourse.vtk.org/t/filter-for-deleting-isolated-voxels/7328 "2021-12-03T22:12:18Z")

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Hello. I have a voxel representation of a volume (mask) and I need to clean all the voxels that are not connected to the main volume. I was wondering if there is an existing filter that could help me identify isolated …

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## [vtkimagedata scalar value at specific point(world point)](https://discourse.vtk.org/t/vtkimagedata-scalar-value-at-specific-point-world-point/7312)

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**Author:** [@Hyunwoo\_Kim](https://discourse.vtk.org/u/Hyunwoo_Kim)\
**Replies:** 1\
**Last updated:** [December 3, 2021, 8:59pm UTC](https://discourse.vtk.org/t/vtkimagedata-scalar-value-at-specific-point-world-point/7312 "2021-12-03T20:59:17Z")

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Hello, I’m trying to get scalar from vtkimagedata I set scalars to the vtkimagedata (0,1,2,3,4,5, etc) And I want to get interpolated data such as 0.99955, 1.4325… at a single 3D point which is inside the bound of imag…

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## [vtkImageAppend and image origin](https://discourse.vtk.org/t/vtkimageappend-and-image-origin/7327)

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**Author:** [@WailmerPail](https://discourse.vtk.org/u/WailmerPail)\
**Replies:** 0\
**Last updated:** [December 3, 2021, 2:06pm UTC](https://discourse.vtk.org/t/vtkimageappend-and-image-origin/7327 "2021-12-03T14:06:34Z")

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Hi Teams, I want to stack different 3d-images together. I understand that this class cannot support images with different spacing, but I found that it also does not support the origin of images. The z-order of the imag…

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## [I would like to ask a question about vtkassembly. The problem is more complex and is written in the content](https://discourse.vtk.org/t/i-would-like-to-ask-a-question-about-vtkassembly-the-problem-is-more-complex-and-is-written-in-the-content/7323)

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**Author:** [@Huzhikun](https://discourse.vtk.org/u/Huzhikun)\
**Replies:** 0\
**Last updated:** [December 3, 2021, 8:08am UTC](https://discourse.vtk.org/t/i-would-like-to-ask-a-question-about-vtkassembly-the-problem-is-more-complex-and-is-written-in-the-content/7323 "2021-12-03T08:08:41Z")

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When I use vtkassembly for assembly, it is assumed that there are two objects in my space at this time, but these two objects are added in render in the form of actors. Adding an actor to the assembly at this time will r…

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## [voxel from multiple vtkImageData and vtkTransformFilter](https://discourse.vtk.org/t/voxel-from-multiple-vtkimagedata-and-vtktransformfilter/7320)

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**Author:** [@riki](https://discourse.vtk.org/u/riki)\
**Replies:** 0\
**Last updated:** [December 3, 2021, 7:07am UTC](https://discourse.vtk.org/t/voxel-from-multiple-vtkimagedata-and-vtktransformfilter/7320 "2021-12-03T07:07:35Z")

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Hi I am working on drawing an ultrasound image in 3D space. If I have multiple data with a set of images and their corresponding rotation and movement parameters (affine transformation matrices), can I render them as vo…

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## [vtkOpenFOAMReader : get bounding box of simulation ?](https://discourse.vtk.org/t/vtkopenfoamreader-get-bounding-box-of-simulation/7308)

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**Author:** [@Nicholas\_Yue](https://discourse.vtk.org/u/Nicholas_Yue)\
**Replies:** 1\
**Last updated:** [December 3, 2021, 12:10am UTC](https://discourse.vtk.org/t/vtkopenfoamreader-get-bounding-box-of-simulation/7308 "2021-12-03T00:10:52Z")

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Hi, I am reading in a vtkOpenFOAMReader object in C++ Independently I can see the computational bounds in Paraview. What methods I can call on the object in C++ to query the computational bounds of the FOAM file ? Do …

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## [Computing the intersection of a mask image and an arbitrary plane](https://discourse.vtk.org/t/computing-the-intersection-of-a-mask-image-and-an-arbitrary-plane/7314)

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**Author:** [@jhlegarreta](https://discourse.vtk.org/u/jhlegarreta)\
**Replies:** 1\
**Last updated:** [December 2, 2021, 6:46pm UTC](https://discourse.vtk.org/t/computing-the-intersection-of-a-mask-image-and-an-arbitrary-plane/7314 "2021-12-02T18:46:34Z")

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Hi there, my VTK lessons are failing me, so asking this here. I have an anatomical image of a brain, and a segmentation of a region of interest. Both saved as NIfTI files. I would like to be able to compute and visual…

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## [How to decimate a vtkPoints ?](https://discourse.vtk.org/t/how-to-decimate-a-vtkpoints/7310)

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**Author:** [@Julienchz](https://discourse.vtk.org/u/Julienchz)\
**Replies:** 1\
**Last updated:** [December 2, 2021, 11:34am UTC](https://discourse.vtk.org/t/how-to-decimate-a-vtkpoints/7310 "2021-12-02T11:34:04Z")

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Hello, How can I decimate a vtkPoints object (with a good distribution of points) to display only a part of the points ? Thanks for your help

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## [Export 3D model to obj format file](https://discourse.vtk.org/t/export-3d-model-to-obj-format-file/7311)

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**Author:** [@Wenhui-person](https://discourse.vtk.org/u/Wenhui-person)\
**Replies:** 0\
**Last updated:** [December 2, 2021, 11:23am UTC](https://discourse.vtk.org/t/export-3d-model-to-obj-format-file/7311 "2021-12-02T11:23:21Z")

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I successfully carried out three-dimensional reconstruction through face rendering, and rendered it with particularly good effect. However, I found that there were no face elements in the exported obj file. What shall I …

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## [Adding Text to Polydata](https://discourse.vtk.org/t/adding-text-to-polydata/7306)

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**Author:** [@devngc](https://discourse.vtk.org/u/devngc)\
**Replies:** 1\
**Last updated:** [December 2, 2021, 2:20am UTC](https://discourse.vtk.org/t/adding-text-to-polydata/7306 "2021-12-02T02:20:05Z")

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Hi All, I am interested in adding text to Polydata that I can write to a file. I see that I can use vtkTextSource and vtkVectorText objects that I can use. I have seen examples where these objects are tied to actors an…

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## [LOD and closest neighbour with vtk octree](https://discourse.vtk.org/t/lod-and-closest-neighbour-with-vtk-octree/7300)

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**Author:** [@Julienchz](https://discourse.vtk.org/u/Julienchz)\
**Replies:** 14\
**Last updated:** [December 1, 2021, 4:38pm UTC](https://discourse.vtk.org/t/lod-and-closest-neighbour-with-vtk-octree/7300 "2021-12-01T16:38:05Z")

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Hello :smiley: I am creating a 3D viewer to display large point cloud, I want to add octree structure to my viewer. This octree must allow me : To display the number of level I want To find the closest neighbour point …

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## [Computing Isosurface on a chosen attribute](https://discourse.vtk.org/t/computing-isosurface-on-a-chosen-attribute/7283)

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**Author:** [@Martin3d](https://discourse.vtk.org/u/Martin3d)\
**Replies:** 1\
**Last updated:** [December 1, 2021, 7:21am UTC](https://discourse.vtk.org/t/computing-isosurface-on-a-chosen-attribute/7283 "2021-12-01T07:21:14Z")

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Hi, I work with an unstructured grid containing multiple attributes. I wish to process the isosurface of one of these attributes, which has been prototyped with Paraview successfully. I thrive to do the same with VTK ba…

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## [Manually trigger vtkCommand](https://discourse.vtk.org/t/manually-trigger-vtkcommand/7158)

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**Author:** [@brnk](https://discourse.vtk.org/u/brnk)\
**Replies:** 4\
**Last updated:** [December 1, 2021, 12:02am UTC](https://discourse.vtk.org/t/manually-trigger-vtkcommand/7158 "2021-12-01T00:02:14Z")

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Hello, I want to create an interactive live visualization of data which I’m streaming from a hardware device. Instead of using a repeating vtkCommand::TimerEvent, I would like to trigger the update manually once the dat…

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## [Placing vtkCaptionActor2D in 3D space](https://discourse.vtk.org/t/placing-vtkcaptionactor2d-in-3d-space/7302)

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**Author:** [@raphf](https://discourse.vtk.org/u/raphf)\
**Replies:** 0\
**Last updated:** [November 30, 2021, 4:55pm UTC](https://discourse.vtk.org/t/placing-vtkcaptionactor2d-in-3d-space/7302 "2021-11-30T16:55:54Z")

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Hi , I’ve been messing around with the vtkCaptionActor2D, and wrote an interaction style for it by following this example : https://kitware.github.io/vtk-examples/site/Cxx/Picking/HighlightPickedActor/ such that one can …

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## [Share cameras between threads](https://discourse.vtk.org/t/share-cameras-between-threads/7276)

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**Author:** [@AlexG](https://discourse.vtk.org/u/AlexG)\
**Replies:** 3\
**Last updated:** [November 30, 2021, 1:19pm UTC](https://discourse.vtk.org/t/share-cameras-between-threads/7276 "2021-11-30T13:19:40Z")

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Hi all, I have two renderers one for a VR application and one as a standart 3D view in an QT GUI. I want to display these two vtkCamera via two vtkCameraActor and pass them to the other renderer. The two applications r…

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## [Is it possible to read multi group obj as multiple vtkPolyDatas?](https://discourse.vtk.org/t/is-it-possible-to-read-multi-group-obj-as-multiple-vtkpolydatas/7299)

<div class="topic-metadata">

**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 0\
**Last updated:** [November 30, 2021, 9:51am UTC](https://discourse.vtk.org/t/is-it-possible-to-read-multi-group-obj-as-multiple-vtkpolydatas/7299 "2021-11-30T09:51:20Z")

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currently,vtkOBJReader will read all groups as a vtkPolyData,how to read different groups as different vtkPolyDatas?

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## [vtkGeometryFilter not passing vtkStringArray](https://discourse.vtk.org/t/vtkgeometryfilter-not-passing-vtkstringarray/7245)

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**Author:** [@Flagada](https://discourse.vtk.org/u/Flagada)\
**Replies:** 11\
**Last updated:** [November 30, 2021, 8:37am UTC](https://discourse.vtk.org/t/vtkgeometryfilter-not-passing-vtkstringarray/7245 "2021-11-30T08:37:52Z")

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Hi ! Correct me if I’m wrong but it seems that in the latest version of VTK the vtkGeometryFilter behavior has changed and a vtkStringArray in source is no more passed to the output. It seems that the array is well crea…

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## [Mingw compile error for vtkm](https://discourse.vtk.org/t/mingw-compile-error-for-vtkm/7265)

<div class="topic-metadata">

**Author:** [@rockydut](https://discourse.vtk.org/u/rockydut)\
**Replies:** 7\
**Last updated:** [November 30, 2021, 2:25am UTC](https://discourse.vtk.org/t/mingw-compile-error-for-vtkm/7265 "2021-11-30T02:25:11Z")

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Dear all. I compile the VTK with vtkm. I got the following compile errors. How to compile it correct with vtkm? D:/Msys64/mingw64/bin/…/lib/gcc/x86\_64-w64-mingw32/11.2.0/…/…/…/…/x86\_64-w64-mingw32/bin/ld.exe: CMakeFiles…

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## [Boolean operation to perform a substraction between polydatas is very slow](https://discourse.vtk.org/t/boolean-operation-to-perform-a-substraction-between-polydatas-is-very-slow/1079)

<div class="topic-metadata">

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 2\
**Last updated:** [November 29, 2021, 7:24pm UTC](https://discourse.vtk.org/t/boolean-operation-to-perform-a-substraction-between-polydatas-is-very-slow/1079 "2021-11-29T19:24:11Z")

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Hi everybody, I want to substract wo polydatas and i am using vtkBooleanOperationPolyDataFilter and it takes hours even for polydatas that are not very big. Any idea how to speed up the process? or any other way to do …

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## [Arc in Polydata](https://discourse.vtk.org/t/arc-in-polydata/7242)

<div class="topic-metadata">

**Author:** [@devngc](https://discourse.vtk.org/u/devngc)\
**Replies:** 4\
**Last updated:** [November 29, 2021, 1:31pm UTC](https://discourse.vtk.org/t/arc-in-polydata/7242 "2021-11-29T13:31:59Z")

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I am using the following code to add an Arc to the Polydata. Please correct me if I am wrong but I can’t get arcs in Polydata. It will still be a line. center = \[0.00, 25.72, 30.99\] p1 = \[77.65, 63.01, 0.04\] p2 = \[77.5…

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