# Latest

**URL:** https://discourse.vtk.org/latest.md?page=172

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

**Page:** 173

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## [Mutliple depth-buffer render passes](https://discourse.vtk.org/t/mutliple-depth-buffer-render-passes/6033)

<div class="topic-metadata">

**Author:** [@dcthomp](https://discourse.vtk.org/u/dcthomp)\
**Replies:** 1\
**Last updated:** [June 21, 2021, 7:14pm UTC](https://discourse.vtk.org/t/mutliple-depth-buffer-render-passes/6033 "2021-06-21T19:14:31Z")

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Hi all (but esp @ken-martin ), we have some multiscale data we’re rendering that runs into problems with depth-buffer precision; we can’t fit the frustum to the entire dataset’s bounds without severe z-fighting due to a …

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## [Why changing example to port it to VR doesn't work?](https://discourse.vtk.org/t/why-changing-example-to-port-it-to-vr-doesnt-work/5937)

<div class="topic-metadata">

**Author:** [@myousefi2016](https://discourse.vtk.org/u/myousefi2016)\
**Replies:** 10\
**Last updated:** [June 21, 2021, 1:54pm UTC](https://discourse.vtk.org/t/why-changing-example-to-port-it-to-vr-doesnt-work/5937 "2021-06-21T13:54:10Z")

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I cloned the latest VTK 9.0 version from your Github repo and build it with OpenVR and SDL2 enabled. I’m using Windows 10 and Microsoft Visual Studio 2019. I’m able to build RayCastIsosurface example without any problem …

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## [Using vtk libraries for writing in xml/vtk fileformat](https://discourse.vtk.org/t/using-vtk-libraries-for-writing-in-xml-vtk-fileformat/6017)

<div class="topic-metadata">

**Author:** [@Sagues](https://discourse.vtk.org/u/Sagues)\
**Replies:** 4\
**Last updated:** [June 21, 2021, 1:12pm UTC](https://discourse.vtk.org/t/using-vtk-libraries-for-writing-in-xml-vtk-fileformat/6017 "2021-06-21T13:12:53Z")

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I am interested in writing files of finite element meshes and results in vtk format. I have found information about it in Text Book Manual of VTK. However, I would like to know if there are libraries that allows to write…

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## [Vtkimage data over vtkstrcturedgrid (performance)](https://discourse.vtk.org/t/vtkimage-data-over-vtkstrcturedgrid-performance/5524)

<div class="topic-metadata">

**Author:** [@Guillaume\_Gillet](https://discourse.vtk.org/u/Guillaume_Gillet)\
**Replies:** 13\
**Last updated:** [June 21, 2021, 1:06pm UTC](https://discourse.vtk.org/t/vtkimage-data-over-vtkstrcturedgrid-performance/5524 "2021-06-21T13:06:30Z")

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Hello, i’m having issues with vtk, as i’m learning it i was asked to make some performance tests, and so i made this little program. It createsa vtkstructuredgrid with different sizes and displays the rendering time, bu…

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## [Need for help. There are some errors when I built the VTK8.2.0 using MingG64.](https://discourse.vtk.org/t/need-for-help-there-are-some-errors-when-i-built-the-vtk8-2-0-using-mingg64/1898)

<div class="topic-metadata">

**Author:** [@pngjian](https://discourse.vtk.org/u/pngjian)\
**Replies:** 2\
**Last updated:** [June 21, 2021, 4:22am UTC](https://discourse.vtk.org/t/need-for-help-there-are-some-errors-when-i-built-the-vtk8-2-0-using-mingg64/1898 "2021-06-21T04:22:49Z")

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I selected the option “BUILD\_SHAREED\_LIBS”, cmake is ok, but errors appeared like this during compling: In file included from E:\\shot\\VTK\\VTK-8.2.0\_src\\Domains\\Chemistry\\vtkSimpleBondPerceiver.cxx:26: E:/shot/VTK/VTK-…

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## [Temporal Series (MultiBlockDataSet)](https://discourse.vtk.org/t/temporal-series-multiblockdataset/6023)

<div class="topic-metadata">

**Author:** [@j-miguel](https://discourse.vtk.org/u/j-miguel)\
**Replies:** 0\
**Last updated:** [June 21, 2021, 1:18am UTC](https://discourse.vtk.org/t/temporal-series-multiblockdataset/6023 "2021-06-21T01:18:37Z")

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Hi there, In order to implement a custom speed playback, I’m currently using a vtkInterpolator for each node to get the timesteps I need. While browsing VTK’s docs/source I’ve found the vtkTemporalInterpolator which I s…

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## [Getting Surface Area of different face normal directions from PolyData](https://discourse.vtk.org/t/getting-surface-area-of-different-face-normal-directions-from-polydata/6020)

<div class="topic-metadata">

**Author:** [@Connor](https://discourse.vtk.org/u/Connor)\
**Replies:** 1\
**Last updated:** [June 20, 2021, 8:53pm UTC](https://discourse.vtk.org/t/getting-surface-area-of-different-face-normal-directions-from-polydata/6020 "2021-06-20T20:53:07Z")

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Hi all, I am creating meshes for 3D crystalline shapes to get an understanding of the surface area covered by each face normal direction. This will allow me to make surface energy predictions. However, whilst I am able…

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## [Pause shift-scale during interaction](https://discourse.vtk.org/t/pause-shift-scale-during-interaction/5992)

<div class="topic-metadata">

**Author:** [@dcthomp](https://discourse.vtk.org/u/dcthomp)\
**Replies:** 2\
**Last updated:** [June 19, 2021, 3:52pm UTC](https://discourse.vtk.org/t/pause-shift-scale-during-interaction/5992 "2021-06-19T15:52:41Z")

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@ken-martin We have a customer with some large-ish, multi-scale data. They definitely want the focal-point shift-scale enabled on their mappers, but have noticed unwanted pauses during interaction when a VBO gets re-uplo…

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## [VTKPython](https://discourse.vtk.org/t/vtkpython/5938)

<div class="topic-metadata">

**Author:** [@Luis\_Carlos\_Carneiro](https://discourse.vtk.org/u/Luis_Carlos_Carneiro)\
**Replies:** 23\
**Last updated:** [June 18, 2021, 8:26pm UTC](https://discourse.vtk.org/t/vtkpython/5938 "2021-06-18T20:26:18Z")

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Dear All, In web-project-templates-master example I am trying to use pycuda package. Traceback (most recent call last): File “./server/vtkpython/vtkw-server.py”, line 48, in from vtk\_protocol import VtkCone File “/…

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## [Error Using the Official vtk.js Tutorials (slides/video)](https://discourse.vtk.org/t/error-using-the-official-vtk-js-tutorials-slides-video/6003)

<div class="topic-metadata">

**Author:** [@davidshq](https://discourse.vtk.org/u/davidshq)\
**Replies:** 1\
**Last updated:** [June 18, 2021, 8:25pm UTC](https://discourse.vtk.org/t/error-using-the-official-vtk-js-tutorials-slides-video/6003 "2021-06-18T20:25:29Z")

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I’ve run into some challenges following the (official) video tutorial series on using VTK.js. I’m on part 2 and have built a project with the code provided. When I attempt to run npm run dev I receive an error about a m…

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## [Context sharing between C/C++ and Python](https://discourse.vtk.org/t/context-sharing-between-c-c-and-python/4998)

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**Author:** [@Luis\_Carlos\_Carneiro](https://discourse.vtk.org/u/Luis_Carlos_Carneiro)\
**Replies:** 5\
**Last updated:** [June 18, 2021, 8:58am UTC](https://discourse.vtk.org/t/context-sharing-between-c-c-and-python/4998 "2021-06-18T08:58:20Z")

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Dear All, Suppose that I displayed a 3D image with VTK in Python and I want to manipulate it with C/C++ (Rotate, pick a point etc). How I share VTK context between C/C++ and Python? Thanks, Luís Gonçalves

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## [multiple canvases - Too many active WebGL contexts. Oldest context will be lost.](https://discourse.vtk.org/t/multiple-canvases-too-many-active-webgl-contexts-oldest-context-will-be-lost/5868)

<div class="topic-metadata">

**Author:** [@a-u](https://discourse.vtk.org/u/a-u)\
**Replies:** 12\
**Last updated:** [June 17, 2021, 3:43pm UTC](https://discourse.vtk.org/t/multiple-canvases-too-many-active-webgl-contexts-oldest-context-will-be-lost/5868 "2021-06-17T15:43:19Z")

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Hi all, I’m trying to display multiple canvases on one page (the specific use case is: CadQuery Examples — CadQuery Documentation). I use the following naive approach: const openglRenderWindow = vtk.Rendering.OpenGL.vt…

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## [Python - Reading Multiple Volumes from NIfTI file](https://discourse.vtk.org/t/python-reading-multiple-volumes-from-nifti-file/5955)

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**Author:** [@Birkl](https://discourse.vtk.org/u/Birkl)\
**Replies:** 6\
**Last updated:** [June 17, 2021, 1:08pm UTC](https://discourse.vtk.org/t/python-reading-multiple-volumes-from-nifti-file/5955 "2021-06-17T13:08:59Z")

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Hi, some background: For my Bachelor’s Thesis I’m working on a medical application handling dosimetry images. For this I have to display them in 3d and 2d. So far, no problem. No I got a list of NIfTI files (.nii) w…

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## [where vtkStripper class in vtk.js](https://discourse.vtk.org/t/where-vtkstripper-class-in-vtk-js/5973)

<div class="topic-metadata">

**Author:** [@agiles](https://discourse.vtk.org/u/agiles)\
**Replies:** 2\
**Last updated:** [June 17, 2021, 12:11pm UTC](https://discourse.vtk.org/t/where-vtkstripper-class-in-vtk-js/5973 "2021-06-17T12:11:34Z")

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I’m rewrite the C++ 's project , C++ using vtkStripper class show object’s section,but I can’t find the class in vtk.js

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## [Question about Scalar Bar Actor via unpkg](https://discourse.vtk.org/t/question-about-scalar-bar-actor-via-unpkg/6010)

<div class="topic-metadata">

**Author:** [@Juan\_Camilo\_Del\_Rio](https://discourse.vtk.org/u/Juan_Camilo_Del_Rio)\
**Replies:** 3\
**Last updated:** [June 16, 2021, 9:26pm UTC](https://discourse.vtk.org/t/question-about-scalar-bar-actor-via-unpkg/6010 "2021-06-16T21:26:36Z")

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Good afternoon. Currently, I’m developing an app to view and filter point clouds, and I wonder if the vtkScalarBarActor will be available via unpkg, due to the date is not possible to use that specific function. Thanks…

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## [CGAL interoperability](https://discourse.vtk.org/t/cgal-interoperability/5985)

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**Author:** [@bistek](https://discourse.vtk.org/u/bistek)\
**Replies:** 9\
**Last updated:** [June 16, 2021, 3:05pm UTC](https://discourse.vtk.org/t/cgal-interoperability/5985 "2021-06-16T15:05:50Z")

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Hello, is somebody aware of good examples on processing VTK objects - e.g. polydata triangulated surfaces - with CGAL tools - e.g. remeshing, Boolean operations, topology. I would be particularly interested in a way to d…

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## [Clipping and cutting polydata shows incomplete contours](https://discourse.vtk.org/t/clipping-and-cutting-polydata-shows-incomplete-contours/4728)

<div class="topic-metadata">

**Author:** [@Marti.R](https://discourse.vtk.org/u/Marti.R)\
**Replies:** 10\
**Last updated:** [June 16, 2021, 2:47pm UTC](https://discourse.vtk.org/t/clipping-and-cutting-polydata-shows-incomplete-contours/4728 "2021-06-16T14:47:43Z")

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Hello everyone! After my last question , to which I got a lot of useful suggestions, I managed to clip and cap a nested polydata. The result is supposed to look like this: The way I did this was to combine the invert…

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## [Problem when trying to setup first VTKJS project](https://discourse.vtk.org/t/problem-when-trying-to-setup-first-vtkjs-project/4761)

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**Author:** [@Rafael\_March](https://discourse.vtk.org/u/Rafael_March)\
**Replies:** 6\
**Last updated:** [June 14, 2021, 8:46pm UTC](https://discourse.vtk.org/t/problem-when-trying-to-setup-first-vtkjs-project/4761 "2021-06-14T20:46:06Z")

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Hello all, my goal is to have a web app with a bootstrap-powered interface and an embedded VTKJS-based render view to visualize 3D volumes. I’m trying to use node to build/start my first VTKJS project according to the …

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## [Turn On/Off Interactivity](https://discourse.vtk.org/t/turn-on-off-interactivity/5993)

<div class="topic-metadata">

**Author:** [@Luis\_Carlos\_Carneiro](https://discourse.vtk.org/u/Luis_Carlos_Carneiro)\
**Replies:** 1\
**Last updated:** [June 15, 2021, 5:11pm UTC](https://discourse.vtk.org/t/turn-on-off-interactivity/5993 "2021-06-15T17:11:18Z")

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Dear All, How to switch on and off the implicit interactor in the example “web-project-templates-master”? I want to interact with other objects. I want if I press the mouse and drag, the picture do not rotate and do an…

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## [Remote interaction. Gestures handling](https://discourse.vtk.org/t/remote-interaction-gestures-handling/5989)

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**Author:** [@EMalikova](https://discourse.vtk.org/u/EMalikova)\
**Replies:** 1\
**Last updated:** [June 15, 2021, 1:02pm UTC](https://discourse.vtk.org/t/remote-interaction-gestures-handling/5989 "2021-06-15T13:02:55Z")

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Dear All, I am working with VTK-based remote vis from this template and I have to implement a gesture support. It seems that for this I have to extend code with rpcGestureEvent similarly to how it is done for rpcRemote…

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## [vtk shared library lookup on linux](https://discourse.vtk.org/t/vtk-shared-library-lookup-on-linux/5997)

<div class="topic-metadata">

**Author:** [@Harald\_Scheirich](https://discourse.vtk.org/u/Harald_Scheirich)\
**Replies:** 5\
**Last updated:** [June 15, 2021, 1:18pm UTC](https://discourse.vtk.org/t/vtk-shared-library-lookup-on-linux/5997 "2021-06-15T13:18:13Z")

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iMSTK depends on vtk for some part of its functionality, i recently rearranged the unit tests (that are utilizing) google test to link to gtest\_main rather than the binary produced via create\_test\_sourcelist in CMAKE, bu…

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## [\[Help\] vtkPointPicker is not detecting points in glyph after scaling through camera](https://discourse.vtk.org/t/help-vtkpointpicker-is-not-detecting-points-in-glyph-after-scaling-through-camera/5995)

<div class="topic-metadata">

**Author:** [@srivastavaayurv](https://discourse.vtk.org/u/srivastavaayurv)\
**Replies:** 0\
**Last updated:** [June 14, 2021, 6:16pm UTC](https://discourse.vtk.org/t/help-vtkpointpicker-is-not-detecting-points-in-glyph-after-scaling-through-camera/5995 "2021-06-14T18:16:04Z")

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Hello! I am using vtk to generate a a glyph of points. On double click , the point should be selected and highlighted green. The feature works correctly before scaling, however after scaling through the camera like such…

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## [VTK installation in Anaconda python distribution](https://discourse.vtk.org/t/vtk-installation-in-anaconda-python-distribution/5990)

<div class="topic-metadata">

**Author:** [@DavidMiraut](https://discourse.vtk.org/u/DavidMiraut)\
**Replies:** 4\
**Last updated:** [June 14, 2021, 2:43pm UTC](https://discourse.vtk.org/t/vtk-installation-in-anaconda-python-distribution/5990 "2021-06-14T14:43:55Z")

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I have some problems when I try to install VTK python package in latest anaconda distribution (2021.5 python 3.8). If I execute: conda install -c conda-forge vtk I only get error messages like: Collecting package …

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## [SetActiveScalars function is too slow](https://discourse.vtk.org/t/setactivescalars-function-is-too-slow/5984)

<div class="topic-metadata">

**Author:** [@sherinnovation](https://discourse.vtk.org/u/sherinnovation)\
**Replies:** 1\
**Last updated:** [June 14, 2021, 11:09am UTC](https://discourse.vtk.org/t/setactivescalars-function-is-too-slow/5984 "2021-06-14T11:09:11Z")

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Hi, I have unstructured data having tetrahedral cells in it. The data also contains 25 different scalar arrays in it. I am able to quickly switch(instantaneous update) between those scalar arrays in paraview, but when it…

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## [multi-component, parallel volume rendering using vtk](https://discourse.vtk.org/t/multi-component-parallel-volume-rendering-using-vtk/5988)

<div class="topic-metadata">

**Author:** [@hari](https://discourse.vtk.org/u/hari)\
**Replies:** 0\
**Last updated:** [June 14, 2021, 9:34am UTC](https://discourse.vtk.org/t/multi-component-parallel-volume-rendering-using-vtk/5988 "2021-06-14T09:34:52Z")

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Hi All, I am trying to do a parallel multi component volume rendering using vtk in python. To do this I developed a custom, parallel aware reader using vtkpythonalgorithmbase. Currently, my approach to achieve this is a…

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## [Missing Library by configuration in Cmake & Sphere Example doesn't work](https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978)

<div class="topic-metadata">

**Author:** [@Hassna87](https://discourse.vtk.org/u/Hassna87)\
**Replies:** 3\
**Last updated:** [June 13, 2021, 12:53am UTC](https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978 "2021-06-13T00:53:26Z")

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Hello everybody, I’m new to VTK, and I have some issues here. After doing the configuration in Cmake, Build\_Examples did not appear within the result of configuration: However, I have completed all the steps (gener…

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## [How to subdivide designated facets efficiently?](https://discourse.vtk.org/t/how-to-subdivide-designated-facets-efficiently/5884)

<div class="topic-metadata">

**Author:** [@oyster](https://discourse.vtk.org/u/oyster)\
**Replies:** 1\
**Last updated:** [June 12, 2021, 3:53am UTC](https://discourse.vtk.org/t/how-to-subdivide-designated-facets-efficiently/5884 "2021-06-12T03:53:07Z")

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Hi all, I have a mesh with some designated facets needed to be subdivided. To make topology consistent, first I remove the involved facet (with cell id), and then insert the new points and the new facets. Here is a cod…

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## [Bill Lorensen](https://discourse.vtk.org/t/bill-lorensen/2288)

<div class="topic-metadata">

**Author:** [@will.schroeder](https://discourse.vtk.org/u/will.schroeder)\
**Replies:** 15\
**Last updated:** [June 11, 2021, 8:56pm UTC](https://discourse.vtk.org/t/bill-lorensen/2288 "2021-06-11T20:56:55Z")

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I’m very sorry to announce that Bill Lorensen has died. As many of you know, Bill was one of the founding authors of the VTK textbook and software. He had remained very active in VTK development even after retiring from …

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## [Python wrapping (functions are missing in code generated)](https://discourse.vtk.org/t/python-wrapping-functions-are-missing-in-code-generated/5983)

<div class="topic-metadata">

**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 4\
**Last updated:** [June 11, 2021, 5:45pm UTC](https://discourse.vtk.org/t/python-wrapping-functions-are-missing-in-code-generated/5983 "2021-06-11T17:45:15Z")

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Hi supporters Just started a larger project based on the VTK pipeline and in relation to this I am creating a number of modules, which could potentially be future remote modules of VTK. I looked into how vtk-dicom was m…

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## [vtk.js with Angular12](https://discourse.vtk.org/t/vtk-js-with-angular12/5968)

<div class="topic-metadata">

**Author:** [@Konstantin.U](https://discourse.vtk.org/u/Konstantin.U)\
**Replies:** 6\
**Last updated:** [June 11, 2021, 3:25pm UTC](https://discourse.vtk.org/t/vtk-js-with-angular12/5968 "2021-06-11T15:25:55Z")

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Hi I am trying to add vtk.js window to Angular 12 component. I am following the procedure as described by Forrest Li here: https://github.com/floryst/vtk-js-angular-10 As soon as I add this line import vtkFullScreenRe…

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