# Latest

**URL:** https://discourse.vtk.org/latest.md?page=138

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

**Page:** 139

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## [Add ability to adding interactive 2D widgets in ParaView](https://discourse.vtk.org/t/add-ability-to-adding-interactive-2d-widgets-in-paraview/1672)

<div class="topic-metadata">

**Author:** [@e-kolosov](https://discourse.vtk.org/u/e-kolosov)\
**Replies:** 4\
**Last updated:** [March 23, 2022, 9:53am UTC](https://discourse.vtk.org/t/add-ability-to-adding-interactive-2d-widgets-in-paraview/1672 "2022-03-23T09:53:21Z")

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Hello. I implemented the ability to adding interactive 2D widgets in ParaView. See discussion https://discourse.paraview.org/t/is-there-any-abilities-to-add-a-interactive-widgets-on-linechartview-same-as-3d-widgets-on-r…

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## [VTK 9 and vtkResliceCursorWidget](https://discourse.vtk.org/t/vtk-9-and-vtkreslicecursorwidget/4114)

<div class="topic-metadata">

**Author:** [@TheRalph](https://discourse.vtk.org/u/TheRalph)\
**Replies:** 6\
**Last updated:** [March 23, 2022, 7:09am UTC](https://discourse.vtk.org/t/vtk-9-and-vtkreslicecursorwidget/4114 "2022-03-23T07:09:36Z")

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Hi, I built a vtk v9.0 Linux debian package with the 27th August 2020 nightly release of the master branch of vtk in order to test the last features before the 9.1 planned to the end of october. Unfortunatly, I experim…

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## [Difficulty in setting up vtkpython](https://discourse.vtk.org/t/difficulty-in-setting-up-vtkpython/8104)

<div class="topic-metadata">

**Author:** [@simplyvish](https://discourse.vtk.org/u/simplyvish)\
**Replies:** 2\
**Last updated:** [March 23, 2022, 6:16am UTC](https://discourse.vtk.org/t/difficulty-in-setting-up-vtkpython/8104 "2022-03-23T06:16:22Z")

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Continuing the discussion from Unable to Load big VTI files in VTK.JS: I tried for server side rendering as the size of vti files is too huge for client side rendering. I’m exploring vtkpython. Followed RemoteRenderer e…

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## [how to set defualt value for vtkProbeFilter?](https://discourse.vtk.org/t/how-to-set-defualt-value-for-vtkprobefilter/8116)

<div class="topic-metadata">

**Author:** [@WailmerPail](https://discourse.vtk.org/u/WailmerPail)\
**Replies:** 0\
**Last updated:** [March 23, 2022, 6:03am UTC](https://discourse.vtk.org/t/how-to-set-defualt-value-for-vtkprobefilter/8116 "2022-03-23T06:03:25Z")

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Hi, teams I am confused with ‘setting default value for vtkProbeFilter’, can anyone tell me how to do that? Besides, there is a class named vtkImageProbeFilter in documents, which version have this class and I found th…

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## [Compose actors into an actor / group](https://discourse.vtk.org/t/compose-actors-into-an-actor-group/8113)

<div class="topic-metadata">

**Author:** [@Nicolas\_Schmidt](https://discourse.vtk.org/u/Nicolas_Schmidt)\
**Replies:** 2\
**Last updated:** [March 23, 2022, 12:35am UTC](https://discourse.vtk.org/t/compose-actors-into-an-actor-group/8113 "2022-03-23T00:35:16Z")

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I’m trying to create a custom vtkOrientationMarkerWidget that looks like a compass rose. I’m going about this by creating an actor to replace the default axes using vtkAppendPolyData that would include some textured plan…

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## [Segmentation fault in Visualizer demo](https://discourse.vtk.org/t/segmentation-fault-in-visualizer-demo/8112)

<div class="topic-metadata">

**Author:** [@bala4krish](https://discourse.vtk.org/u/bala4krish)\
**Replies:** 0\
**Last updated:** [March 22, 2022, 6:43pm UTC](https://discourse.vtk.org/t/segmentation-fault-in-visualizer-demo/8112 "2022-03-22T18:43:08Z")

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Hello, I am new to using VTK. Sorry if this very basic question. But I am unable to proceed with my own project. Can someone please help fix this? I installed the libvtk7-qt-dev using the linux apt. My requirement is t…

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## [How to convert vtkPolyData to image coordinates?](https://discourse.vtk.org/t/how-to-convert-vtkpolydata-to-image-coordinates/8108)

<div class="topic-metadata">

**Author:** [@lbrandao](https://discourse.vtk.org/u/lbrandao)\
**Replies:** 1\
**Last updated:** [March 22, 2022, 6:32pm UTC](https://discourse.vtk.org/t/how-to-convert-vtkpolydata-to-image-coordinates/8108 "2022-03-22T18:32:36Z")

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Dear All, I have a vtkPolyData file (extension.vtk) with 12 points: These points are the annotation of a 3D image data (more exactly, a multi-slice DICOM image - one folder with 14 slices/frames .dcm). I need to co…

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## [Filter points from Polydata](https://discourse.vtk.org/t/filter-points-from-polydata/8109)

<div class="topic-metadata">

**Author:** [@Kevin\_Sweeney](https://discourse.vtk.org/u/Kevin_Sweeney)\
**Replies:** 2\
**Last updated:** [March 22, 2022, 5:07pm UTC](https://discourse.vtk.org/t/filter-points-from-polydata/8109 "2022-03-22T17:07:30Z")

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I have a vtkPolyData data object, which is used as input data to a vtk.Rendering.Core.vtkGlyph3DMapper to plot spheres. These polydata have scalars mapped to them which are used to colour the spheres. I am trying to see…

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## [vtkDataArray::GetRange and ghost information](https://discourse.vtk.org/t/vtkdataarray-getrange-and-ghost-information/8099)

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**Author:** [@Yohann\_Bearzi](https://discourse.vtk.org/u/Yohann_Bearzi)\
**Replies:** 12\
**Last updated:** [March 22, 2022, 5:07pm UTC](https://discourse.vtk.org/t/vtkdataarray-getrange-and-ghost-information/8099 "2022-03-22T17:07:10Z")

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I’m posting to get feedbacks. Currently, there is no way to skip values inside a vtkDataArray when fetching its range using vtkDataArray::GetRange. A reason someone would want to skip values is when the data array is ti…

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## [QQuickVTKRenderItem not working on emscripten](https://discourse.vtk.org/t/qquickvtkrenderitem-not-working-on-emscripten/8027)

<div class="topic-metadata">

**Author:** [@Zoheir](https://discourse.vtk.org/u/Zoheir)\
**Replies:** 2\
**Last updated:** [March 22, 2022, 12:54pm UTC](https://discourse.vtk.org/t/qquickvtkrenderitem-not-working-on-emscripten/8027 "2022-03-22T12:54:13Z")

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Dear, I am trying to use the QQuickVTKRenderItem to render a vtk scene in a qml for web application using emscripten. For my purpose i just changed the test in (GUISupport\\QtQuick\\Testing\\Cxx) to be able to build and r…

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## [vtkWriter to memory](https://discourse.vtk.org/t/vtkwriter-to-memory/8087)

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**Author:** [@whophil](https://discourse.vtk.org/u/whophil)\
**Replies:** 5\
**Last updated:** [March 21, 2022, 10:13pm UTC](https://discourse.vtk.org/t/vtkwriter-to-memory/8087 "2022-03-21T22:13:34Z")

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Occasionally I want to use a vtkWriter to write to memory instead of disk. The docs offer this teaser: vtkWriter is an abstract class for mapper objects that write their data to disk (or into a communications port) I…

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## [vtk.js: Glyph3DMapper does not add glyphs](https://discourse.vtk.org/t/vtk-js-glyph3dmapper-does-not-add-glyphs/8097)

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**Author:** [@Nikhil216](https://discourse.vtk.org/u/Nikhil216)\
**Replies:** 2\
**Last updated:** [March 21, 2022, 6:10pm UTC](https://discourse.vtk.org/t/vtk-js-glyph3dmapper-does-not-add-glyphs/8097 "2022-03-21T18:10:11Z")

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I am trying to follow the code given in the Glyph3DMapper example. I copied the code given but I don’t see the same ouptut. Here is the codepen I am using https://codepen.io/nikhil216/pen/gOoMabj. The glyphs do not appe…

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## [Coordinates(x,y) values and pixel values under the cursor using vtk.js](https://discourse.vtk.org/t/coordinates-x-y-values-and-pixel-values-under-the-cursor-using-vtk-js/8095)

<div class="topic-metadata">

**Author:** [@Sneha-pk](https://discourse.vtk.org/u/Sneha-pk)\
**Replies:** 1\
**Last updated:** [March 21, 2022, 3:21pm UTC](https://discourse.vtk.org/t/coordinates-x-y-values-and-pixel-values-under-the-cursor-using-vtk-js/8095 "2022-03-21T15:21:30Z")

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I am trying to display the coordinates(x,y) under the mouse cursor (on mousemove event) and also the pixel value using vtk.js on a vtkImageSlice. Is there any widget that already does that ? I know how to do that using …

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## [Problem running SimpleRayCast.py example](https://discourse.vtk.org/t/problem-running-simpleraycast-py-example/8092)

<div class="topic-metadata">

**Author:** [@Arni](https://discourse.vtk.org/u/Arni)\
**Replies:** 2\
**Last updated:** [March 21, 2022, 8:19am UTC](https://discourse.vtk.org/t/problem-running-simpleraycast-py-example/8092 "2022-03-21T08:19:34Z")

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Hello. I am trying to learn vtk but I am having problems running some of the examples. I tried some basic examples and they were working fine, but some examples that require a filename argument gave me problems. Specific…

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## [odb file](https://discourse.vtk.org/t/odb-file/8048)

<div class="topic-metadata">

**Author:** [@chengchengjing](https://discourse.vtk.org/u/chengchengjing)\
**Replies:** 2\
**Last updated:** [March 21, 2022, 2:20am UTC](https://discourse.vtk.org/t/odb-file/8048 "2022-03-21T02:20:47Z")

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how to get vtk file from odb file?

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## [vtkPNGReader() equivalent in vtk.js](https://discourse.vtk.org/t/vtkpngreader-equivalent-in-vtk-js/5250)

<div class="topic-metadata">

**Author:** [@Saptarshi\_Paul](https://discourse.vtk.org/u/Saptarshi_Paul)\
**Replies:** 4\
**Last updated:** [March 19, 2022, 9:50pm UTC](https://discourse.vtk.org/t/vtkpngreader-equivalent-in-vtk-js/5250 "2022-03-19T21:50:13Z")

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Hello everyone, I am trying to read a 2d png image stack in vtk for volume rendering. Is there any equivalent libarary of vtkPNGReader in vtk.js. Any help and guidance would be greatly appreciated. Best Regards

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## [Cascade appanding -TopoDS\_Shape- to -vtkAppendPolyData- or -vtkCleanPolyData- or simply convert -TopoDS\_Shape- to -vtkPolyData- NOT WORKING](https://discourse.vtk.org/t/cascade-appanding-topods-shape-to-vtkappendpolydata-or-vtkcleanpolydata-or-simply-convert-topods-shape-to-vtkpolydata-not-working/7967)

<div class="topic-metadata">

**Author:** [@anon41080341](https://discourse.vtk.org/u/anon41080341)\
**Replies:** 3\
**Last updated:** [March 19, 2022, 3:46pm UTC](https://discourse.vtk.org/t/cascade-appanding-topods-shape-to-vtkappendpolydata-or-vtkcleanpolydata-or-simply-convert-topods-shape-to-vtkpolydata-not-working/7967 "2022-03-19T15:46:04Z")

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//Dear OCC VTK stuff //In short, The problem is, I cannot append TopoDS\_Shape to vtkAppendPolyData nor to vtkCleanPolyData. //I cant even convert TopoDS\_Shape to vtkPolyData. //If you run this simple example, this is …

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## [I don't know 1 byte Memory Leaks. help me.](https://discourse.vtk.org/t/i-dont-know-1-byte-memory-leaks-help-me/8064)

<div class="topic-metadata">

**Author:** [@ldk7972](https://discourse.vtk.org/u/ldk7972)\
**Replies:** 1\
**Last updated:** [March 19, 2022, 5:18am UTC](https://discourse.vtk.org/t/i-dont-know-1-byte-memory-leaks-help-me/8064 "2022-03-19T05:18:36Z")

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vtkSmartPointer\<vtkActor\> m\_vtkpModification\_Actor = vtkSmartPointer\<vtkActor\>::New(); vtkSmartPointer\<vtkUnstructuredGrid\> v\_Temp\_linegrid = vtkSmartPointer\<vtkUnstructuredGrid\>::New(); vtkSmartPointer\<vtkDataSetMapper\> …

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## [How to download VTK 9.0.0, there are only 9.1.0](https://discourse.vtk.org/t/how-to-download-vtk-9-0-0-there-are-only-9-1-0/8040)

<div class="topic-metadata">

**Author:** [@linbeijianbaoxia](https://discourse.vtk.org/u/linbeijianbaoxia)\
**Replies:** 5\
**Last updated:** [March 19, 2022, 5:08am UTC](https://discourse.vtk.org/t/how-to-download-vtk-9-0-0-there-are-only-9-1-0/8040 "2022-03-19T05:08:32Z")

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The 9.1.0 maybe have some error when I recompile OCCT, so I try to use 9.0.0, but I can’t find it.

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## [Can't build VTK sample project: Missing module](https://discourse.vtk.org/t/cant-build-vtk-sample-project-missing-module/8056)

<div class="topic-metadata">

**Author:** [@Ilmu011](https://discourse.vtk.org/u/Ilmu011)\
**Replies:** 28\
**Last updated:** [March 18, 2022, 9:05pm UTC](https://discourse.vtk.org/t/cant-build-vtk-sample-project-missing-module/8056 "2022-03-18T21:05:11Z")

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I am trying to build the CylinderExample with VTK. I am on ubuntu 20.04 LTS and installed VTK with vcpkg. The project is built with CMake. However, the CMake initialization command fails: Skipping CylinderExample: Coul…

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## [Overlapping AMR support in vtkHDF](https://discourse.vtk.org/t/overlapping-amr-support-in-vtkhdf/7868)

<div class="topic-metadata">

**Author:** [@Francois\_Mazen](https://discourse.vtk.org/u/Francois_Mazen)\
**Replies:** 9\
**Last updated:** [March 18, 2022, 8:25pm UTC](https://discourse.vtk.org/t/overlapping-amr-support-in-vtkhdf/7868 "2022-03-18T20:25:11Z")

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Hello, this is a proposal to add Overlapping AMR support to the vtkHDF format. AMR stands for Adaptive Mesh Refinement. The definition is basically a collection of image data grouped by level, where each level is a ref…

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## [FourPaneViewer example misses testcase](https://discourse.vtk.org/t/fourpaneviewer-example-misses-testcase/7849)

<div class="topic-metadata">

**Author:** [@pettaa123](https://discourse.vtk.org/u/pettaa123)\
**Replies:** 5\
**Last updated:** [March 18, 2022, 2:44pm UTC](https://discourse.vtk.org/t/fourpaneviewer-example-misses-testcase/7849 "2022-03-18T14:44:47Z")

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Since there is no test case specified for FourPaneViewer example and I have some failed tests,I dont know if my self compiled code is faulty or my input is wrong. LastTest.log: Running test command: "C:/Program Files/C…

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## [How scalar opacity slider/blending mode selector can be used to interact with two volume at once?](https://discourse.vtk.org/t/how-scalar-opacity-slider-blending-mode-selector-can-be-used-to-interact-with-two-volume-at-once/8078)

<div class="topic-metadata">

**Author:** [@Yuvi-416](https://discourse.vtk.org/u/Yuvi-416)\
**Replies:** 1\
**Last updated:** [March 18, 2022, 2:30pm UTC](https://discourse.vtk.org/t/how-scalar-opacity-slider-blending-mode-selector-can-be-used-to-interact-with-two-volume-at-once/8078 "2022-03-18T14:30:57Z")

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Hello everyone, I upload two samples at the same time so that both can be rendered in the same canvas with different colours and the below code works very well for that. But now I want to control their scalar opacity a…

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## [vtkPlanes is empty when using GetPlanes](https://discourse.vtk.org/t/vtkplanes-is-empty-when-using-getplanes/6662)

<div class="topic-metadata">

**Author:** [@AhmedAlshawi](https://discourse.vtk.org/u/AhmedAlshawi)\
**Replies:** 2\
**Last updated:** [March 18, 2022, 1:42pm UTC](https://discourse.vtk.org/t/vtkplanes-is-empty-when-using-getplanes/6662 "2022-03-18T13:42:05Z")

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Hi. I am trying to use vtkBoxWidget2 to clip an unstructured grid. Within my vtkBoxCallback, I initiate the planes variable and then grab the planes from the vtkBoxRepresentation. However, the planes variable is always …

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## [where can we download the example test data](https://discourse.vtk.org/t/where-can-we-download-the-example-test-data/8079)

<div class="topic-metadata">

**Author:** [@longjiang321](https://discourse.vtk.org/u/longjiang321)\
**Replies:** 2\
**Last updated:** [March 18, 2022, 12:50pm UTC](https://discourse.vtk.org/t/where-can-we-download-the-example-test-data/8079 "2022-03-18T12:50:21Z")

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hi friends: I am a fresher of VTK, I am trying to learn the examples provided officely one by one, but It is realy a greate challenge for me to get the test data like .vtp, .vti, .ply, .mha…, I think this is a common …

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## [How to add a QComboBox in QVTKOpenGLNativeWidget?](https://discourse.vtk.org/t/how-to-add-a-qcombobox-in-qvtkopenglnativewidget/8081)

<div class="topic-metadata">

**Author:** [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)\
**Replies:** 0\
**Last updated:** [March 18, 2022, 6:04am UTC](https://discourse.vtk.org/t/how-to-add-a-qcombobox-in-qvtkopenglnativewidget/8081 "2022-03-18T06:04:21Z")

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Now, I need to add a QComboBox in QVTKOpenGLNativeWidget. However, I fand the signal-slot do not work. The code is: #include \<qapplication.h\> #include \<qsurfaceformat.h\> #include \<QVTKOpenGLNativeWidget.h\> #include \<qc…

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## [How to define different sections in an Unstructured Grid?](https://discourse.vtk.org/t/how-to-define-different-sections-in-an-unstructured-grid/8076)

<div class="topic-metadata">

**Author:** [@jaeg1710](https://discourse.vtk.org/u/jaeg1710)\
**Replies:** 3\
**Last updated:** [March 17, 2022, 2:13pm UTC](https://discourse.vtk.org/t/how-to-define-different-sections-in-an-unstructured-grid/8076 "2022-03-17T14:13:22Z")

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Hello, i have a mesh from my finite-elements-analysis which consists of two sections. Now i am trying to write a separate .vtk file for each section so i can view them in paraview. Problem is the two section share the s…

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## [Picking among many Images in vtkImageStack](https://discourse.vtk.org/t/picking-among-many-images-in-vtkimagestack/8049)

<div class="topic-metadata">

**Author:** [@Valentin\_Regueiro](https://discourse.vtk.org/u/Valentin_Regueiro)\
**Replies:** 6\
**Last updated:** [March 16, 2022, 3:11pm UTC](https://discourse.vtk.org/t/picking-among-many-images-in-vtkimagestack/8049 "2022-03-16T15:11:01Z")

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Hello everyone, I have a renderer displaying a vtkImageStack with a bunch of vtkImageSlices (segmentations) with transparent backgrounds. All of the slices should be pickable so I set them all on the same (active) layer…

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## [How to use vtk to display the figures on my computer from a remote server?](https://discourse.vtk.org/t/how-to-use-vtk-to-display-the-figures-on-my-computer-from-a-remote-server/8059)

<div class="topic-metadata">

**Author:** [@Cc-YY](https://discourse.vtk.org/u/Cc-YY)\
**Replies:** 4\
**Last updated:** [March 16, 2022, 1:31pm UTC](https://discourse.vtk.org/t/how-to-use-vtk-to-display-the-figures-on-my-computer-from-a-remote-server/8059 "2022-03-16T13:31:14Z")

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Hello, I’m using vscode with Remote X11 extension and mobaXterm to connect the linux server and display the figures on my computer. It works well when I use the functions like matplotlib.pyplot.imshow(). But when I use…

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## [Visualize Field data python](https://discourse.vtk.org/t/visualize-field-data-python/8066)

<div class="topic-metadata">

**Author:** [@imomnipresent](https://discourse.vtk.org/u/imomnipresent)\
**Replies:** 0\
**Last updated:** [March 16, 2022, 8:24am UTC](https://discourse.vtk.org/t/visualize-field-data-python/8066 "2022-03-16T08:24:41Z")

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I would like to visualize the displacement field data on my unstructured grid created using vtkPoints() in python. I have the displacement field data at each point. How can i create a vtu file with all these data (point …

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