# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=71

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

**Page:** 72

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## [Best pipeline for large MultiBlockDataset](https://discourse.vtk.org/t/best-pipeline-for-large-multiblockdataset/8998)

<div class="topic-metadata">

**Author:** [@BotellaA](https://discourse.vtk.org/u/BotellaA)\
**Replies:** 2\
**Last updated:** [July 27, 2022, 2:44pm UTC](https://discourse.vtk.org/t/best-pipeline-for-large-multiblockdataset/8998 "2022-07-27T14:44:11Z")

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Hello, I am starting to use a MultuBlockDataset. It can be composed of hundreds of point sets, lines, surfaces, and unstructured grids. I struggle to understand what pipeline I should use for this kind of data. Should I…

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## [Wrong behaviour stacking different images with vtkImageAppend](https://discourse.vtk.org/t/wrong-behaviour-stacking-different-images-with-vtkimageappend/1761)

<div class="topic-metadata">

**Author:** [@dev3011](https://discourse.vtk.org/u/dev3011)\
**Replies:** 5\
**Last updated:** [July 27, 2022, 9:27am UTC](https://discourse.vtk.org/t/wrong-behaviour-stacking-different-images-with-vtkimageappend/1761 "2022-07-27T09:27:43Z")

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Hey, I have trouble solving the following task with VTK: I have a couple of 2D images I obtain from OpenCV that represent slices of a 3D object. I want to stack these 2D images (in z direction) to reconstruct the 3D st…

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## [Read a VTK from a file content](https://discourse.vtk.org/t/read-a-vtk-from-a-file-content/9017)

<div class="topic-metadata">

**Author:** [@moshec](https://discourse.vtk.org/u/moshec)\
**Replies:** 5\
**Last updated:** [July 27, 2022, 1:53am UTC](https://discourse.vtk.org/t/read-a-vtk-from-a-file-content/9017 "2022-07-27T01:53:27Z")

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Hi everyone, I’m using Python, I have a tar file that contains some VTK files, I don’t want to extract the files to the hard disk and then read the file with a reader- Instead, I assign the VTK file content in run ti…

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## [Python Overloading Resolution issue with vtkMultiProcessController::Gather](https://discourse.vtk.org/t/python-overloading-resolution-issue-with-vtkmultiprocesscontroller-gather/9023)

<div class="topic-metadata">

**Author:** [@spyridon97](https://discourse.vtk.org/u/spyridon97)\
**Replies:** 4\
**Last updated:** [July 26, 2022, 11:04pm UTC](https://discourse.vtk.org/t/python-overloading-resolution-issue-with-vtkmultiprocesscontroller-gather/9023 "2022-07-26T23:04:39Z")

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I want to invoke the following function from python: int Gather(vtkDataObject\* sendBuffer, std::vector\<vtkSmartPointer\<vtkDataObject\>\>& recvBuffer, int destProcessId) I have the following python code gathered\_…

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## [How to scale vtkTensorGlyphs to get constant size glyphs with respect to the screen](https://discourse.vtk.org/t/how-to-scale-vtktensorglyphs-to-get-constant-size-glyphs-with-respect-to-the-screen/9020)

<div class="topic-metadata">

**Author:** [@rischoe](https://discourse.vtk.org/u/rischoe)\
**Replies:** 0\
**Last updated:** [July 26, 2022, 10:29am UTC](https://discourse.vtk.org/t/how-to-scale-vtktensorglyphs-to-get-constant-size-glyphs-with-respect-to-the-screen/9020 "2022-07-26T10:29:57Z")

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With vtkGlyph3d I’m able to visualize points as spheres with constant “screensize” by using SetScaleModeToScaleByScalar and vtkDistanceToCamera to generate the distance scalars. Another point representation I want to rea…

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## [I have a problem regarding vtkSelectPolyData](https://discourse.vtk.org/t/i-have-a-problem-regarding-vtkselectpolydata/9019)

<div class="topic-metadata">

**Author:** [@loufear](https://discourse.vtk.org/u/loufear)\
**Replies:** 0\
**Last updated:** [July 26, 2022, 10:02am UTC](https://discourse.vtk.org/t/i-have-a-problem-regarding-vtkselectpolydata/9019 "2022-07-26T10:02:08Z")

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If my polygon data has multiple layers (the polygon data also contains polygon data), when vtkSelectPolyData is selected, the internal data will be fixed and the surface selected part will be output. i am confused

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## [Light source questions](https://discourse.vtk.org/t/light-source-questions/8996)

<div class="topic-metadata">

**Author:** [@llobera](https://discourse.vtk.org/u/llobera)\
**Replies:** 2\
**Last updated:** [July 25, 2022, 5:32pm UTC](https://discourse.vtk.org/t/light-source-questions/8996 "2022-07-25T17:32:21Z")

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I would like to set a light source on a location on a terrain (PolyData). a) If I wanted the light to be like a lightbulb, which type of light would I use (and what settings?)? I do not want any other source of light. b)…

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## [Compile 9.0 without opengl](https://discourse.vtk.org/t/compile-9-0-without-opengl/4026)

<div class="topic-metadata">

**Author:** [@wenyan4work](https://discourse.vtk.org/u/wenyan4work)\
**Replies:** 4\
**Last updated:** [July 25, 2022, 4:54pm UTC](https://discourse.vtk.org/t/compile-9-0-without-opengl/4026 "2022-07-25T16:54:10Z")

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Is it possible to compile vtk 9.0 without opengl? The only thing we need is the IO module of legacy vtk files and binary xml vtk files (pvtp, vtp, pvtu, vtu, etc). I found instructions about this from an email back in 2…

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## [How to get the illuminated cells of an actor when using light?](https://discourse.vtk.org/t/how-to-get-the-illuminated-cells-of-an-actor-when-using-light/9004)

<div class="topic-metadata">

**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 0\
**Last updated:** [July 25, 2022, 4:04am UTC](https://discourse.vtk.org/t/how-to-get-the-illuminated-cells-of-an-actor-when-using-light/9004 "2022-07-25T04:04:23Z")

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Hello,is there any way get the illuminated cells when using light?

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## [Maximum number of clients reachedERROR: In /home/aarju/VTK-7.1.1/Rendering/OpenGL2/vtkXOpenGLRenderWindow.cxx, line 1497 vtkXOpenGLRenderWindow (0x555dac8b7280): bad X server connection. DISPLAY=:0. Aborting.](https://discourse.vtk.org/t/maximum-number-of-clients-reachederror-in-home-aarju-vtk-7-1-1-rendering-opengl2-vtkxopenglrenderwindow-cxx-line-1497-vtkxopenglrenderwindow-0x555dac8b7280-bad-x-server-connection-display-0-aborting/8977)

<div class="topic-metadata">

**Author:** [@guptaaarju](https://discourse.vtk.org/u/guptaaarju)\
**Replies:** 5\
**Last updated:** [July 22, 2022, 2:29pm UTC](https://discourse.vtk.org/t/maximum-number-of-clients-reachederror-in-home-aarju-vtk-7-1-1-rendering-opengl2-vtkxopenglrenderwindow-cxx-line-1497-vtkxopenglrenderwindow-0x555dac8b7280-bad-x-server-connection-display-0-aborting/8977 "2022-07-22T14:29:39Z")

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Hi, I’m using VTK with QT. After running 215 frames of point cloud data, My program is crashing and getting this error. Maximum number of clients reachedERROR: In /home/aarju/VTK-7.1.1/Rendering/OpenGL2/vtkXOpenGLRende…

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## [QVTKOpenGLWidget: Vertices disappear when RenderPointsAsSpheresON()](https://discourse.vtk.org/t/qvtkopenglwidget-vertices-disappear-when-renderpointsassphereson/1007)

<div class="topic-metadata">

**Author:** [@sdobashi](https://discourse.vtk.org/u/sdobashi)\
**Replies:** 2\
**Last updated:** [July 22, 2022, 3:04am UTC](https://discourse.vtk.org/t/qvtkopenglwidget-vertices-disappear-when-renderpointsassphereson/1007 "2022-07-22T03:04:16Z")

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Hi everyone, When using QVTKOpenGLWidget, the vertices cannot be rendered as spheres (they disappear) when I set “RenderPointsAsSpheresON()”, while they are properly rendered with vtkRenderWindow. I want to obtain the…

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## [How to check whether software/hardware environment supports VTK.](https://discourse.vtk.org/t/how-to-check-whether-software-hardware-environment-supports-vtk/8616)

<div class="topic-metadata">

**Author:** [@Endless](https://discourse.vtk.org/u/Endless)\
**Replies:** 3\
**Last updated:** [July 22, 2022, 1:15am UTC](https://discourse.vtk.org/t/how-to-check-whether-software-hardware-environment-supports-vtk/8616 "2022-07-22T01:15:15Z")

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Our team use the VTK 9.0 to build 3D program. We find the following messages: vtkOpenGLExtensionManager VTK： vtkOpenGLExtensionManager Class Reference VTK/OpenGL Driver Information VTK/OpenGL 驱动程序信息 - KitwarePublic O…

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## [SetOrigin, SetPosition in a vtk3DProp](https://discourse.vtk.org/t/setorigin-setposition-in-a-vtk3dprop/8973)

<div class="topic-metadata">

**Author:** [@ujjwala](https://discourse.vtk.org/u/ujjwala)\
**Replies:** 4\
**Last updated:** [July 21, 2022, 6:41pm UTC](https://discourse.vtk.org/t/setorigin-setposition-in-a-vtk3dprop/8973 "2022-07-21T18:41:20Z")

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Hi, I’m new to VTK and I’m struggling to understand what setOrigin and setPosition mean in vtk3DProp. I’m trying to display multiple cubes ( with specific x, y, z lengths and x, y, z co-ordinates with labels) using vtkA…

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## [Manually add seeds when using vtkSeedWidget?](https://discourse.vtk.org/t/manually-add-seeds-when-using-vtkseedwidget/8979)

<div class="topic-metadata">

**Author:** [@cmengich](https://discourse.vtk.org/u/cmengich)\
**Replies:** 3\
**Last updated:** [July 21, 2022, 7:23am UTC](https://discourse.vtk.org/t/manually-add-seeds-when-using-vtkseedwidget/8979 "2022-07-21T07:23:42Z")

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Hello, When using the vtkSeedWidget, is there a method to manually add a seedpoint from within code? I have gone through the documentation, and only find the GetSeed() & DeleteSeed() methods. Is there any way to add a…

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## [VTKCutter leaves gaps, does not return the every point it intersects](https://discourse.vtk.org/t/vtkcutter-leaves-gaps-does-not-return-the-every-point-it-intersects/8986)

<div class="topic-metadata">

**Author:** [@ugursasun](https://discourse.vtk.org/u/ugursasun)\
**Replies:** 0\
**Last updated:** [July 21, 2022, 3:49am UTC](https://discourse.vtk.org/t/vtkcutter-leaves-gaps-does-not-return-the-every-point-it-intersects/8986 "2022-07-21T03:49:43Z")

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I have an STL file, I’m working on it a while to collect xyz data through the line drawn on its surface(red line). I wrote a function using VTKCutter and believed that the class was collecting each point its implicit …

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## [Interactor and callback: VTK 9.1 + QtQuick](https://discourse.vtk.org/t/interactor-and-callback-vtk-9-1-qtquick/8800)

<div class="topic-metadata">

**Author:** [@Parisa\_Rabbani](https://discourse.vtk.org/u/Parisa_Rabbani)\
**Replies:** 1\
**Last updated:** [July 20, 2022, 10:33pm UTC](https://discourse.vtk.org/t/interactor-and-callback-vtk-9-1-qtquick/8800 "2022-07-20T22:33:44Z")

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Hi, I have a simple GUI with VTK+QT that would update the volume constantly. We use it to have 3D live volume rendering. I am trying to do the same thing with a QtQuick GUI, I faced two issues: 1- The timer callback t…

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## [3D bar charts in VTK?](https://discourse.vtk.org/t/3d-bar-charts-in-vtk/8953)

<div class="topic-metadata">

**Author:** [@DStranz](https://discourse.vtk.org/u/DStranz)\
**Replies:** 4\
**Last updated:** [July 19, 2022, 2:24pm UTC](https://discourse.vtk.org/t/3d-bar-charts-in-vtk/8953 "2022-07-19T14:24:33Z")

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I would like to implement a 3D bar chart similar to this (from qwt3D) or what is available in matplotlib. Is there any such class in VTK? If not can I ask for some pointers about how to get started? Thanks.

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## [Trouble interacting with contextviews on viewports](https://discourse.vtk.org/t/trouble-interacting-with-contextviews-on-viewports/8554)

<div class="topic-metadata">

**Author:** [@Afonso\_Pinto](https://discourse.vtk.org/u/Afonso_Pinto)\
**Replies:** 1\
**Last updated:** [July 19, 2022, 10:30am UTC](https://discourse.vtk.org/t/trouble-interacting-with-contextviews-on-viewports/8554 "2022-07-19T10:30:16Z")

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Hello everyone, I’m trying to implement a VTK widget that is supposed to display various charts on different viewports and I would like for the user to be able to get the tooltip that displays the information about the …

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## [How to achieve this clipping like OpenGL dose?](https://discourse.vtk.org/t/how-to-achieve-this-clipping-like-opengl-dose/8941)

<div class="topic-metadata">

**Author:** [@xxyyy159](https://discourse.vtk.org/u/xxyyy159)\
**Replies:** 1\
**Last updated:** [July 18, 2022, 10:10pm UTC](https://discourse.vtk.org/t/how-to-achieve-this-clipping-like-opengl-dose/8941 "2022-07-18T22:10:34Z")

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Hi all, I find an interesting blog showing the way clipping the iso surface like below. blog source Can VTK do this ? Actually, I’m using unstructured grid to achieve the same effort, but way more source consumptio…

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## [Random horizontal lines when displaying image](https://discourse.vtk.org/t/random-horizontal-lines-when-displaying-image/8956)

<div class="topic-metadata">

**Author:** [@Jesper\_Henriksen](https://discourse.vtk.org/u/Jesper_Henriksen)\
**Replies:** 3\
**Last updated:** [July 18, 2022, 10:01pm UTC](https://discourse.vtk.org/t/random-horizontal-lines-when-displaying-image/8956 "2022-07-18T22:01:05Z")

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I get a strange behavior when displaying an image in vtk. At random the image displays horizontal lines when being displayed. Has anybody encountered this bug before. The code (slightly stripped) looks like this: …

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## [How to specify bounds for vtkAnnotatedCubeActor ?](https://discourse.vtk.org/t/how-to-specify-bounds-for-vtkannotatedcubeactor/8964)

<div class="topic-metadata">

**Author:** [@ujjwala](https://discourse.vtk.org/u/ujjwala)\
**Replies:** 2\
**Last updated:** [July 18, 2022, 8:03pm UTC](https://discourse.vtk.org/t/how-to-specify-bounds-for-vtkannotatedcubeactor/8964 "2022-07-18T20:03:12Z")

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Hi, I’m trying to display a cube with labels on each face of the cube using vtkAnnotatedCubeActor. I was wondering if I can specify the size of cube (xlength, ylength, zlength along with xcenter, ycenter, zcenter) someh…

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## [vtkOpenGLStickMapper usage](https://discourse.vtk.org/t/vtkopenglstickmapper-usage/8901)

<div class="topic-metadata">

**Author:** [@Justin\_Weber](https://discourse.vtk.org/u/Justin_Weber)\
**Replies:** 1\
**Last updated:** [July 18, 2022, 7:24pm UTC](https://discourse.vtk.org/t/vtkopenglstickmapper-usage/8901 "2022-07-18T19:24:50Z")

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I am trying to render lots of cylinders and would like to use vtkOpenGLStickMapper instead of glyphs to see if it is more performant. However I can’t figure out how to use vtkOpenGLStickMapper. I am just giving it polyda…

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## [Fluid camera movement in a scene](https://discourse.vtk.org/t/fluid-camera-movement-in-a-scene/7548)

<div class="topic-metadata">

**Author:** [@efc](https://discourse.vtk.org/u/efc)\
**Replies:** 5\
**Last updated:** [July 18, 2022, 6:10pm UTC](https://discourse.vtk.org/t/fluid-camera-movement-in-a-scene/7548 "2022-07-18T18:10:35Z")

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A bit of context: The GUI element for this question are made with QML. I’m currently building a scene – i.e. several actor in the same space related to one another through a matrix transform hierarchy – and am adding a …

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## [Unable to find a valid OpenGL 3.2 or later implementation.](https://discourse.vtk.org/t/unable-to-find-a-valid-opengl-3-2-or-later-implementation/8857)

<div class="topic-metadata">

**Author:** [@edwardAllen](https://discourse.vtk.org/u/edwardAllen)\
**Replies:** 2\
**Last updated:** [July 18, 2022, 1:55pm UTC](https://discourse.vtk.org/t/unable-to-find-a-valid-opengl-3-2-or-later-implementation/8857 "2022-07-18T13:55:19Z")

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I am build VTK on Macos M1 ,and here is the CmakeCache.txt CMakeCache.txt (162.1 KB) Here is application running output : vtkGenericOpenGLRenderWindow (0x7ff2aa10d4f0): Unable to find a valid OpenGL 3.2 or later imple…

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## [How to do "Annotation&Measurement" on MPR?](https://discourse.vtk.org/t/how-to-do-annotation-measurement-on-mpr/8920)

<div class="topic-metadata">

**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 4\
**Last updated:** [July 17, 2022, 5:26am UTC](https://discourse.vtk.org/t/how-to-do-annotation-measurement-on-mpr/8920 "2022-07-17T05:26:08Z")

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How to do “Annotation&Measurement” on MPR like MITK or 3D Slicer?

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## [vtk pick not working when zoomed very far in](https://discourse.vtk.org/t/vtk-pick-not-working-when-zoomed-very-far-in/8960)

<div class="topic-metadata">

**Author:** [@bheld](https://discourse.vtk.org/u/bheld)\
**Replies:** 0\
**Last updated:** [July 15, 2022, 7:25pm UTC](https://discourse.vtk.org/t/vtk-pick-not-working-when-zoomed-very-far-in/8960 "2022-07-15T19:25:27Z")

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We are using vtkHandleWidget and vtkPointHandleRepresentation3D together to support a dragable point in our VTK window. This works well except when zoomed way in. At some level of zooming, the widget can no longer be sel…

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## [vtkDistancePolyDataFilter segmentation fault](https://discourse.vtk.org/t/vtkdistancepolydatafilter-segmentation-fault/8952)

<div class="topic-metadata">

**Author:** [@BraveDistribution](https://discourse.vtk.org/u/BraveDistribution)\
**Replies:** 0\
**Last updated:** [July 14, 2022, 1:45pm UTC](https://discourse.vtk.org/t/vtkdistancepolydatafilter-segmentation-fault/8952 "2022-07-14T13:45:36Z")

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Hello, I’d like to compare 2 surface meshes (model-to-model avg distance). I have looked through the code and found few examples. Theoretically, it should work but on getting the output from PolyDataFilter I have seg fa…

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## [Cannot log in to gitlab.kitware.com by using github](https://discourse.vtk.org/t/cannot-log-in-to-gitlab-kitware-com-by-using-github/8937)

<div class="topic-metadata">

**Author:** [@mau\_igna\_06](https://discourse.vtk.org/u/mau_igna_06)\
**Replies:** 5\
**Last updated:** [July 14, 2022, 10:23am UTC](https://discourse.vtk.org/t/cannot-log-in-to-gitlab-kitware-com-by-using-github/8937 "2022-07-14T10:23:49Z")

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I could do it on Ubuntu, but not on Windows Now I cannot log in at all in Windows and it doesn’t even let me change the password, the page says: 422 The change you requested was rejected. --- Make sure you have acce…

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## [QVTKOpenGLWidget cannot be displayed with Remote Desktop xfce.](https://discourse.vtk.org/t/qvtkopenglwidget-cannot-be-displayed-with-remote-desktop-xfce/8942)

<div class="topic-metadata">

**Author:** [@nnw](https://discourse.vtk.org/u/nnw)\
**Replies:** 1\
**Last updated:** [July 14, 2022, 6:08am UTC](https://discourse.vtk.org/t/qvtkopenglwidget-cannot-be-displayed-with-remote-desktop-xfce/8942 "2022-07-14T06:08:29Z")

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Hello, I have been trying to use QVTKOpenGLWidget with PCL in Jetson nano. It’s working fine in Jetson nano but I need to run the program with remote desktop in windows10. When I open Qt Creator in remote desktop(xfce),…

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## [Issue with GetScalarPointer and GetScalarRange in c++](https://discourse.vtk.org/t/issue-with-getscalarpointer-and-getscalarrange-in-c/8925)

<div class="topic-metadata">

**Author:** [@lonewolf](https://discourse.vtk.org/u/lonewolf)\
**Replies:** 3\
**Last updated:** [July 13, 2022, 6:51am UTC](https://discourse.vtk.org/t/issue-with-getscalarpointer-and-getscalarrange-in-c/8925 "2022-07-13T06:51:01Z")

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Hi all, I am facing a strange behavior and I am pretty sure I am missing something. Using VTK 8.0.1. I have a 3D VtkImageData to which I need to modify the scalar values. When I get the ScalarRange is ok before changin…

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