# Latest

**URL:** https://discourse.vtk.org/latest.md?page=179

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

**Page:** 180

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## [VTK.js Proxies](https://discourse.vtk.org/t/vtk-js-proxies/5476)

<div class="topic-metadata">

**Author:** [@tobie\_desgreniers](https://discourse.vtk.org/u/tobie_desgreniers)\
**Replies:** 8\
**Last updated:** [April 12, 2021, 10:53pm UTC](https://discourse.vtk.org/t/vtk-js-proxies/5476 "2021-04-12T22:53:51Z")

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Hi! Would it be possible to have a fairly simple example of proxies declaration and usage? I know there’s the ParaView Glance example, but I find it quite hard to understand everything that is involved to manage the re…

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## [3D Plane in a discrete domain.](https://discourse.vtk.org/t/3d-plane-in-a-discrete-domain/5512)

<div class="topic-metadata">

**Author:** [@Luis\_Carlos\_Carneiro](https://discourse.vtk.org/u/Luis_Carlos_Carneiro)\
**Replies:** 6\
**Last updated:** [April 12, 2021, 8:58pm UTC](https://discourse.vtk.org/t/3d-plane-in-a-discrete-domain/5512 "2021-04-12T20:58:24Z")

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Dear All, Perhaps a math question but I think someone in this forum knows. I have a 3D plane defined by 3 floating points. I determine the plane equation parameters (ax+by+cz+d=0). I want to test all integer points (x,…

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## [3D visualization of wavefield at given points](https://discourse.vtk.org/t/3d-visualization-of-wavefield-at-given-points/5540)

<div class="topic-metadata">

**Author:** [@aida](https://discourse.vtk.org/u/aida)\
**Replies:** 0\
**Last updated:** [April 12, 2021, 6:36pm UTC](https://discourse.vtk.org/t/3d-visualization-of-wavefield-at-given-points/5540 "2021-04-12T18:36:10Z")

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Hello, I am writing to you to ask for some guidance about a visualization goal. I have performed 3D simulations for wave propagation. I have the snapshots at different times for the whole propagation medium (i.e. a cub…

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## [Silent failures in python](https://discourse.vtk.org/t/silent-failures-in-python/5531)

<div class="topic-metadata">

**Author:** [@Ingmar](https://discourse.vtk.org/u/Ingmar)\
**Replies:** 5\
**Last updated:** [April 12, 2021, 6:09pm UTC](https://discourse.vtk.org/t/silent-failures-in-python/5531 "2021-04-12T18:09:40Z")

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I often experience issues when implementing VTK based python scripts, which are really hard to debug, sometimes not even an error message window is showing up (in my current case with vtkMetaImageWriter). Is there any wa…

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## [Volume Rendering with Binary mask](https://discourse.vtk.org/t/volume-rendering-with-binary-mask/4339)

<div class="topic-metadata">

**Author:** [@assia.shabeeba](https://discourse.vtk.org/u/assia.shabeeba)\
**Replies:** 3\
**Last updated:** [April 11, 2021, 4:57pm UTC](https://discourse.vtk.org/t/volume-rendering-with-binary-mask/4339 "2021-04-11T16:57:21Z")

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Hi , I have rendered a volume using vtkGPUVolumeRaycastMapper, now I need to mask the volume using binary mask Mapper.SetMaskTypeToBinary() Mapper.SetMaskInput(maskImageData) , but the mask is not working. Does anyone …

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## [Tools for telemetry monitoring in VTKWeb](https://discourse.vtk.org/t/tools-for-telemetry-monitoring-in-vtkweb/5504)

<div class="topic-metadata">

**Author:** [@EMalikova](https://discourse.vtk.org/u/EMalikova)\
**Replies:** 2\
**Last updated:** [April 11, 2021, 8:43am UTC](https://discourse.vtk.org/t/tools-for-telemetry-monitoring-in-vtkweb/5504 "2021-04-11T08:43:30Z")

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Dear All, I am looking for tools to measure the rendering performance on client side for VTKWeb. For ParaviewWeb-based client there is a class RemoteRendererStatsTable that collects detailed information on performance p…

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## [vtk.js No input error](https://discourse.vtk.org/t/vtk-js-no-input-error/5505)

<div class="topic-metadata">

**Author:** [@Saptarshi\_Paul](https://discourse.vtk.org/u/Saptarshi_Paul)\
**Replies:** 14\
**Last updated:** [April 9, 2021, 9:42pm UTC](https://discourse.vtk.org/t/vtk-js-no-input-error/5505 "2021-04-09T21:42:37Z")

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Hello All, I am trying to do volume rendering which works with fullscreenrendering but I want to place it in a div element rather than full screen. I tried the example which was provided here vtk.js, but I am getting no…

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## [ParaView User and VTK Python online courses coming up in June !](https://discourse.vtk.org/t/paraview-user-and-vtk-python-online-courses-coming-up-in-june/5522)

<div class="topic-metadata">

**Author:** [@mwestphal](https://discourse.vtk.org/u/mwestphal)\
**Replies:** 0\
**Last updated:** [April 9, 2021, 1:37pm UTC](https://discourse.vtk.org/t/paraview-user-and-vtk-python-online-courses-coming-up-in-june/5522 "2021-04-09T13:37:05Z")

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Kitware SAS is organizing VTK and ParaView online courses in June 2021 ! You are working on your python application or scripts and want to know how to use VTK for rendering and analysing your data ? You Already have som…

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## [Embedding VTK render in a dialog box in PyQT (i.e., not using QMainWindow)](https://discourse.vtk.org/t/embedding-vtk-render-in-a-dialog-box-in-pyqt-i-e-not-using-qmainwindow/5492)

<div class="topic-metadata">

**Author:** [@Vardonir](https://discourse.vtk.org/u/Vardonir)\
**Replies:** 2\
**Last updated:** [April 9, 2021, 6:56am UTC](https://discourse.vtk.org/t/embedding-vtk-render-in-a-dialog-box-in-pyqt-i-e-not-using-qmainwindow/5492 "2021-04-09T06:56:33Z")

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I have a class that’s subclassed from QFrame that looks like this class TestVTKinQFrame(QFrame): def \_\_init\_\_(self): super(TestVTKinQFrame, self).\_\_init\_\_() self.vl = QVBoxLayout() self.vtkW…

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## [Large point cloud with varying colors and radii](https://discourse.vtk.org/t/large-point-cloud-with-varying-colors-and-radii/5519)

<div class="topic-metadata">

**Author:** [@nantille](https://discourse.vtk.org/u/nantille)\
**Replies:** 0\
**Last updated:** [April 8, 2021, 4:02pm UTC](https://discourse.vtk.org/t/large-point-cloud-with-varying-colors-and-radii/5519 "2021-04-08T16:02:03Z")

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Is it possible to use vtkVertexGlyphFilter (or any other method) and set custom radii and colors for millions of points? I could make it work with colors but I couldn’t find a way to define individual vertex/point size. …

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## [vtkDataWriter crashes with an array that is a vtkMappedDataArray subclass](https://discourse.vtk.org/t/vtkdatawriter-crashes-with-an-array-that-is-a-vtkmappeddataarray-subclass/5517)

<div class="topic-metadata">

**Author:** [@biagas](https://discourse.vtk.org/u/biagas)\
**Replies:** 2\
**Last updated:** [April 8, 2021, 3:00pm UTC](https://discourse.vtk.org/t/vtkdatawriter-crashes-with-an-array-that-is-a-vtkmappeddataarray-subclass/5517 "2021-04-08T15:00:17Z")

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I am using VTK-8.1.0 and attempting to create subclass of vtkMappedDataArray for use with non-AOS data. I used vtkCPExodusIINodalCoordinatesTemplate as a guide. My subclass is being used to represent vtkStructuredGrid c…

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## [Kitware Medical Group is hiring](https://discourse.vtk.org/t/kitware-medical-group-is-hiring/5475)

<div class="topic-metadata">

**Author:** [@Andinet\_Enquobahrie](https://discourse.vtk.org/u/Andinet_Enquobahrie)\
**Replies:** 3\
**Last updated:** [April 8, 2021, 9:58am UTC](https://discourse.vtk.org/t/kitware-medical-group-is-hiring/5475 "2021-04-08T09:58:29Z")

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\[Apologies for duplicate posting\] There are several job opportunities for talented software developers and research and development engineers in the Medical Group at Kitware. Please forward these opportunities to your s…

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## [Compiling VTK Python with OSPRay](https://discourse.vtk.org/t/compiling-vtk-python-with-ospray/5491)

<div class="topic-metadata">

**Author:** [@nantille](https://discourse.vtk.org/u/nantille)\
**Replies:** 10\
**Last updated:** [April 8, 2021, 9:33am UTC](https://discourse.vtk.org/t/compiling-vtk-python-with-ospray/5491 "2021-04-08T09:33:12Z")

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Hello, It’s quite a mystery how to build VTK python with OSPRay. I couldn’t find proper information for building it (in my case on Ubuntu LTS 20). I first tried to clone VTK release branch and compile it with OSPRay. T…

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## [OpenXR - VTK](https://discourse.vtk.org/t/openxr-vtk/1709)

<div class="topic-metadata">

**Author:** [@hummlj](https://discourse.vtk.org/u/hummlj)\
**Replies:** 4\
**Last updated:** [April 7, 2021, 4:23pm UTC](https://discourse.vtk.org/t/openxr-vtk/1709 "2021-04-07T16:23:30Z")

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Hi, I’m working on a research project of real-time/near real-time flow visualization of large flow field measurements. I’ve found Kitware members are engaged with the development of Khronos OpenXR standard. Does anyone…

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## [VTKData and VTKLargeData](https://discourse.vtk.org/t/vtkdata-and-vtklargedata/5514)

<div class="topic-metadata">

**Author:** [@thegbiv](https://discourse.vtk.org/u/thegbiv)\
**Replies:** 1\
**Last updated:** [April 7, 2021, 3:46pm UTC](https://discourse.vtk.org/t/vtkdata-and-vtklargedata/5514 "2021-04-07T15:46:06Z")

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Hi all, There was a time where I could checkout/download VTKData and VTKLargeData to have some sample datasets to play around with. I’ve downloaded the links from the download page but I’m not quite clear on how to get …

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## [vtkThreshold not working with vtkMultiBlockDataSet?](https://discourse.vtk.org/t/vtkthreshold-not-working-with-vtkmultiblockdataset/5406)

<div class="topic-metadata">

**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 3\
**Last updated:** [April 7, 2021, 3:18pm UTC](https://discourse.vtk.org/t/vtkthreshold-not-working-with-vtkmultiblockdataset/5406 "2021-04-07T15:18:16Z")

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I’m trying to threshold datasets in a vtkMultiBlockDataSet, but the filter returns a None type - I’m working in Python 3.8.2 and vtk 9.0.1 The code fragment is shown below and export is returned as None The input is a …

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## [boolean library for meshes with vtk bridget](https://discourse.vtk.org/t/boolean-library-for-meshes-with-vtk-bridget/5510)

<div class="topic-metadata">

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 0\
**Last updated:** [April 7, 2021, 8:15am UTC](https://discourse.vtk.org/t/boolean-library-for-meshes-with-vtk-bridget/5510 "2021-04-07T08:15:59Z")

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Hello, I wonder if you can recommend me a powerful boolean library for meshes that can be easily adapted to vtk. I have tried vtkbool library. The result is ok but when I want to get the larger connected component, I on…

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## [Why vtkMetaImageReader read a .mha file, the memory blast?](https://discourse.vtk.org/t/why-vtkmetaimagereader-read-a-mha-file-the-memory-blast/5506)

<div class="topic-metadata">

**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 0\
**Last updated:** [April 7, 2021, 12:52am UTC](https://discourse.vtk.org/t/why-vtkmetaimagereader-read-a-mha-file-the-memory-blast/5506 "2021-04-07T00:52:45Z")

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vtkSmartPointer imagereader = vtkSmartPointer::New(); imagereader-\>SetFileName(filename); imagereader-\>Update(); this is the code when i read a .mha file just 2.3M, the program memory expand to 1 G? this “filename” j…

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## [Error building SliceCAT](https://discourse.vtk.org/t/error-building-slicecat/5327)

<div class="topic-metadata">

**Author:** [@Jothybasu\_Selvaraj](https://discourse.vtk.org/u/Jothybasu_Selvaraj)\
**Replies:** 3\
**Last updated:** [April 6, 2021, 6:09pm UTC](https://discourse.vtk.org/t/error-building-slicecat/5327 "2021-04-06T18:09:05Z")

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I am trying to customize my application using Slicer but I am getting these errors. Can anyone help me please? Severity Code Description Project Path File Line Suppression State Error LNK2019 unresolved external…

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## [parsing vtu to obj with triangle strips](https://discourse.vtk.org/t/parsing-vtu-to-obj-with-triangle-strips/5501)

<div class="topic-metadata">

**Author:** [@humbletang](https://discourse.vtk.org/u/humbletang)\
**Replies:** 2\
**Last updated:** [April 6, 2021, 1:43am UTC](https://discourse.vtk.org/t/parsing-vtu-to-obj-with-triangle-strips/5501 "2021-04-06T01:43:43Z")

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Hello there, I’m writing a python converter for some simulation files that come out as unstructured grid .vtu but I keep ending up with extra geometry. Could some one tell me from the following data what the final 2 tr…

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## [Interact with stl model by axes separately](https://discourse.vtk.org/t/interact-with-stl-model-by-axes-separately/5414)

<div class="topic-metadata">

**Author:** [@l1va](https://discourse.vtk.org/u/l1va)\
**Replies:** 3\
**Last updated:** [April 5, 2021, 8:13pm UTC](https://discourse.vtk.org/t/interact-with-stl-model-by-axes-separately/5414 "2021-04-05T20:13:59Z")

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Dear All, I want to interact (rotate, move) model by axes separately. Only by X for example. And to do it user-friendly for sure. I found BoxWidget - it is great for scaling, but I didn’t find how to extend it for my n…

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## [vtk.js server site openGL.](https://discourse.vtk.org/t/vtk-js-server-site-opengl/5495)

<div class="topic-metadata">

**Author:** [@Luis\_Carlos\_Carneiro](https://discourse.vtk.org/u/Luis_Carlos_Carneiro)\
**Replies:** 7\
**Last updated:** [April 5, 2021, 6:03pm UTC](https://discourse.vtk.org/t/vtk-js-server-site-opengl/5495 "2021-04-05T18:03:32Z")

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Dear All, In web-project-templates-master example it is created an OpenGL window in the server side. For that it is needed a Graphics card that supports OpenGL. Can that window be created/mapped in RAM memory and withou…

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## [VTK9 vtkBalloonWidget seg faults](https://discourse.vtk.org/t/vtk9-vtkballoonwidget-seg-faults/5498)

<div class="topic-metadata">

**Author:** [@marcomusy](https://discourse.vtk.org/u/marcomusy)\
**Replies:** 0\
**Last updated:** [April 5, 2021, 4:11pm UTC](https://discourse.vtk.org/t/vtk9-vtkballoonwidget-seg-faults/5498 "2021-04-05T16:11:18Z")

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Example: https://kitware.github.io/vtk-examples/site/Python/Widgets/BalloonWidget/ gives Segmentation fault on vtk==9.0.1 while it works ok in vtk==8.1.2 (Ubuntu 20.04.2 LTS)

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## [How to access Point coordinates as PointData arrays?](https://discourse.vtk.org/t/how-to-access-point-coordinates-as-pointdata-arrays/5484)

<div class="topic-metadata">

**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 2\
**Last updated:** [April 2, 2021, 10:00pm UTC](https://discourse.vtk.org/t/how-to-access-point-coordinates-as-pointdata-arrays/5484 "2021-04-02T22:00:13Z")

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Hello!!! I want to use the coordinates of Points in an unstucturedGrid as part of an equation in vtkArrayCalculator. In Paraview, I cann access the point coordinates as vector PointData using the array name ‘coords’ -…

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## [Take a screenshot of the scene with a transparent background](https://discourse.vtk.org/t/take-a-screenshot-of-the-scene-with-a-transparent-background/5468)

<div class="topic-metadata">

**Author:** [@zaidb](https://discourse.vtk.org/u/zaidb)\
**Replies:** 1\
**Last updated:** [April 2, 2021, 9:25pm UTC](https://discourse.vtk.org/t/take-a-screenshot-of-the-scene-with-a-transparent-background/5468 "2021-04-02T21:25:03Z")

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Hello, As it is possible to get the canvas of the renderWindow, I was wondering if it’s possible to take a screenshot of the scene with a transparent? Kind regards, Zaid

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## [Best Way to Convert Structured Points Vtk File into DICOM?](https://discourse.vtk.org/t/best-way-to-convert-structured-points-vtk-file-into-dicom/5483)

<div class="topic-metadata">

**Author:** [@searica](https://discourse.vtk.org/u/searica)\
**Replies:** 1\
**Last updated:** [April 2, 2021, 3:24pm UTC](https://discourse.vtk.org/t/best-way-to-convert-structured-points-vtk-file-into-dicom/5483 "2021-04-02T15:24:32Z")

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I’ve got a structured points file I made with Houndsfield values for each point and I would like to convert into into a DICOM file that can be read imported into Mimics or 3D Slicer. I found this http://gdcm.sourceforge.…

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## [VTK.js as a server](https://discourse.vtk.org/t/vtk-js-as-a-server/5489)

<div class="topic-metadata">

**Author:** [@joaomlap](https://discourse.vtk.org/u/joaomlap)\
**Replies:** 3\
**Last updated:** [April 2, 2021, 3:20pm UTC](https://discourse.vtk.org/t/vtk-js-as-a-server/5489 "2021-04-02T15:20:23Z")

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I have been going through some tutorials using Paraview Web Lite and using VTK.js with a VTK server (with python wrappers). I was wondering if it would be possible to use VTK.js as the server? What are your thoughts on …

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## [Controlling text property for vtkLabelPlacementMapper](https://discourse.vtk.org/t/controlling-text-property-for-vtklabelplacementmapper/5487)

<div class="topic-metadata">

**Author:** [@subhacom](https://discourse.vtk.org/u/subhacom)\
**Replies:** 1\
**Last updated:** [April 2, 2021, 12:46pm UTC](https://discourse.vtk.org/t/controlling-text-property-for-vtklabelplacementmapper/5487 "2021-04-02T12:46:24Z")

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I am displaying some labels on a set of points in Python using vtkLabelPlacementMapper. The problem is the text is rendered in white by default, and becomes invisible when the background color is white as well. Looking…

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## [Custom Shader vs Camera Frustrum for infinite plane](https://discourse.vtk.org/t/custom-shader-vs-camera-frustrum-for-infinite-plane/5481)

<div class="topic-metadata">

**Author:** [@j-miguel](https://discourse.vtk.org/u/j-miguel)\
**Replies:** 0\
**Last updated:** [April 1, 2021, 10:24pm UTC](https://discourse.vtk.org/t/custom-shader-vs-camera-frustrum-for-infinite-plane/5481 "2021-04-01T22:24:38Z")

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Dear All, I’m currently using VTK (7.1.1) to create off-shore simulations. I got the sea bottom working using Delaunay from bathymetric point cloud. Now, I’m trying to create a visual representation of the sea as an a…

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## [Inconsistent Render of Colored PolyData](https://discourse.vtk.org/t/inconsistent-render-of-colored-polydata/5396)

<div class="topic-metadata">

**Author:** [@ksh\_co](https://discourse.vtk.org/u/ksh_co)\
**Replies:** 1\
**Last updated:** [April 1, 2021, 7:25pm UTC](https://discourse.vtk.org/t/inconsistent-render-of-colored-polydata/5396 "2021-04-01T19:25:23Z")

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Hi, I have a number of unstructured meshes (of right ventricles) converted to PolyData on which I am attempting to identify physiologically relevant regions (septal wall, free wall, valves, etc). Based on location, curv…

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