# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=49

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

**Page:** 50

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## [Are multiple "PointData" datasets supported using VTKHDF "ImageData".](https://discourse.vtk.org/t/are-multiple-pointdata-datasets-supported-using-vtkhdf-imagedata/11418)

<div class="topic-metadata">

**Author:** [@HendersonSC](https://discourse.vtk.org/u/HendersonSC)\
**Replies:** 1\
**Last updated:** [May 9, 2023, 8:10pm UTC](https://discourse.vtk.org/t/are-multiple-pointdata-datasets-supported-using-vtkhdf-imagedata/11418 "2023-05-09T20:10:37Z")

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The documentation for VTKHDF seems to suggest that the following code: import h5py import numpy as np with h5py.File("wtf.hdf",'w') as hdffile: # write support data vtkhdf\_group = hdffile.create\_group(…

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## [Certificate verification failed](https://discourse.vtk.org/t/certificate-verification-failed/11385)

<div class="topic-metadata">

**Author:** [@automata](https://discourse.vtk.org/u/automata)\
**Replies:** 11\
**Last updated:** [May 9, 2023, 5:49pm UTC](https://discourse.vtk.org/t/certificate-verification-failed/11385 "2023-05-09T17:49:04Z")

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While trying to install vtk-osmesa, we are getting the following error: Err:5 https://apt.kitware.com/ubuntu bionic Release Certificate verification failed: The certificate is NOT trusted. The received OCSP status res…

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## [Paraview can not find reader for .hdf file in Windows](https://discourse.vtk.org/t/paraview-can-not-find-reader-for-hdf-file-in-windows/11398)

<div class="topic-metadata">

**Author:** [@lucasbanting](https://discourse.vtk.org/u/lucasbanting)\
**Replies:** 7\
**Last updated:** [May 9, 2023, 3:24pm UTC](https://discourse.vtk.org/t/paraview-can-not-find-reader-for-hdf-file-in-windows/11398 "2023-05-09T15:24:05Z")

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I am trying to make an Unstructured grid in the HDF file format. I created my file using HDF5.jl. HDF5.File: (read-write) test\_file.h5 └─ :open\_file\_folder: VTKHDF ├─ :label: Version ├─ :1234: Connectivity ├─ …

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## [Question about the boolean operation in vtk](https://discourse.vtk.org/t/question-about-the-boolean-operation-in-vtk/11375)

<div class="topic-metadata">

**Author:** [@ljx006barbatos](https://discourse.vtk.org/u/ljx006barbatos)\
**Replies:** 4\
**Last updated:** [May 9, 2023, 11:26am UTC](https://discourse.vtk.org/t/question-about-the-boolean-operation-in-vtk/11375 "2023-05-09T11:26:44Z")

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Context: I want to have the union of two walls, the walls may have some offset in both the x and y directions. But the result of my testing is terrible. The result of testing: Codes: int main(int, char\* \[\]) { floa…

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## [Question about the event mouse-hover in MFC project](https://discourse.vtk.org/t/question-about-the-event-mouse-hover-in-mfc-project/11412)

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**Author:** [@ljx006barbatos](https://discourse.vtk.org/u/ljx006barbatos)\
**Replies:** 0\
**Last updated:** [May 9, 2023, 10:51am UTC](https://discourse.vtk.org/t/question-about-the-event-mouse-hover-in-mfc-project/11412 "2023-05-09T10:51:30Z")

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Context: I have built a scene with several actors to present two rooms and the components in MFC program, and I want to implement a function: I can print some message to identify components when I put my cursor in the it…

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## [Building VTK for Qt fails due to makefile error](https://discourse.vtk.org/t/building-vtk-for-qt-fails-due-to-makefile-error/11394)

<div class="topic-metadata">

**Author:** [@Z.O.E](https://discourse.vtk.org/u/Z.O.E)\
**Replies:** 1\
**Last updated:** [May 9, 2023, 9:55am UTC](https://discourse.vtk.org/t/building-vtk-for-qt-fails-due-to-makefile-error/11394 "2023-05-09T09:55:15Z")

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Hello, I wanted to use QVTKOpenGLWidget in my Qt application. But I am unable to build VTK for Qt in the first place. I am on Ubuntu 22.04, Qt version installed is 5.15.3, cmake is 3.22.1. I downloaded VTK-8.2.0 and it…

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## [Multi vtkRenderWindow Rendering Issues](https://discourse.vtk.org/t/multi-vtkrenderwindow-rendering-issues/11373)

<div class="topic-metadata">

**Author:** [@a772485252](https://discourse.vtk.org/u/a772485252)\
**Replies:** 4\
**Last updated:** [May 9, 2023, 5:13am UTC](https://discourse.vtk.org/t/multi-vtkrenderwindow-rendering-issues/11373 "2023-05-09T05:13:38Z")

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Hello everyone, I have a question. I have four vtkRenderWindows, one of which has a timer that helps me continuously render something when I start it. At this point, when I interact with other windows, it will block ren…

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## [Cropping plane scaling](https://discourse.vtk.org/t/cropping-plane-scaling/11327)

<div class="topic-metadata">

**Author:** [@theGunner24](https://discourse.vtk.org/u/theGunner24)\
**Replies:** 5\
**Last updated:** [May 8, 2023, 1:20pm UTC](https://discourse.vtk.org/t/cropping-plane-scaling/11327 "2023-05-08T13:20:13Z")

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Hello ! I use AddClippingPlane method in vtk volume rendering and can easily set origin and orientation of plane.Is it possible to also scale cropping plane in volume mapper ? If not because I assume so as vtkPlane is m…

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## [Picking label points](https://discourse.vtk.org/t/picking-label-points/11401)

<div class="topic-metadata">

**Author:** [@machur](https://discourse.vtk.org/u/machur)\
**Replies:** 0\
**Last updated:** [May 7, 2023, 9:41pm UTC](https://discourse.vtk.org/t/picking-label-points/11401 "2023-05-07T21:41:22Z")

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Hi, I’m using VTK to visualize medical data in Python. My goal is to display 3D points with “clickable” labels, so I can pick a label and hide it from the user. I found the following example in C++ that pretty much cov…

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## [Zoom closest to data](https://discourse.vtk.org/t/zoom-closest-to-data/11330)

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**Author:** [@vishalkumar2222](https://discourse.vtk.org/u/vishalkumar2222)\
**Replies:** 2\
**Last updated:** [May 6, 2023, 6:01pm UTC](https://discourse.vtk.org/t/zoom-closest-to-data/11330 "2023-05-06T18:01:32Z")

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Hi Guys, I want to implement zoom closest to data. Similar like the one which there in Para view. Thanks in advance,

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## [Error: vtkXOpenGLRenderWindow: bad X server connection](https://discourse.vtk.org/t/error-vtkxopenglrenderwindow-bad-x-server-connection/11301)

<div class="topic-metadata">

**Author:** [@automata](https://discourse.vtk.org/u/automata)\
**Replies:** 3\
**Last updated:** [May 5, 2023, 1:35pm UTC](https://discourse.vtk.org/t/error-vtkxopenglrenderwindow-bad-x-server-connection/11301 "2023-05-05T13:35:43Z")

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We are trying to run a Python script that imports VTK and uses pyvirtualdisplay (Xvfb) to render images while running in a Kubernetes pod. We installed VTK through pip install vtk (making sure we had the required libgl1…

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## [How to check if an octant is inside, partially inside, or outside the polydata?](https://discourse.vtk.org/t/how-to-check-if-an-octant-is-inside-partially-inside-or-outside-the-polydata/11321)

<div class="topic-metadata">

**Author:** [@Kunal\_Gupta](https://discourse.vtk.org/u/Kunal_Gupta)\
**Replies:** 2\
**Last updated:** [May 4, 2023, 4:35pm UTC](https://discourse.vtk.org/t/how-to-check-if-an-octant-is-inside-partially-inside-or-outside-the-polydata/11321 "2023-05-04T16:35:22Z")

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How to check if an octant is inside, partially inside, or outside the polydata?

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## [There is a question about vtk BooleanOperation PolyDataFilter](https://discourse.vtk.org/t/there-is-a-question-about-vtk-booleanoperation-polydatafilter/9333)

<div class="topic-metadata">

**Author:** [@Dwight98](https://discourse.vtk.org/u/Dwight98)\
**Replies:** 2\
**Last updated:** [May 4, 2023, 12:39pm UTC](https://discourse.vtk.org/t/there-is-a-question-about-vtk-booleanoperation-polydatafilter/9333 "2023-05-04T12:39:31Z")

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I have a strange problem with vtk for Boolean arithmetic，When i use the intersection operation, the result I get is as shown in the following figure when i use the union operation,the result i get is as shown in the …

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## [VTK 9.x without hardware OpenGL acceleration on Windows](https://discourse.vtk.org/t/vtk-9-x-without-hardware-opengl-acceleration-on-windows/9396)

<div class="topic-metadata">

**Author:** [@bheld](https://discourse.vtk.org/u/bheld)\
**Replies:** 8\
**Last updated:** [May 3, 2023, 8:03pm UTC](https://discourse.vtk.org/t/vtk-9-x-without-hardware-opengl-acceleration-on-windows/9396 "2023-05-03T20:03:02Z")

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Is there a prescription for VTK 9.x and OpenGL1 (Mesa) now that the OpenGL1 backend in VTK has been removed? The build instructions at https://gitlab.kitware.com/vtk/vtk/-/blob/master/Documentation/dev/build.md really o…

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## [VTK 9 build help](https://discourse.vtk.org/t/vtk-9-build-help/7267)

<div class="topic-metadata">

**Author:** [@no2497](https://discourse.vtk.org/u/no2497)\
**Replies:** 20\
**Last updated:** [May 3, 2023, 8:01pm UTC](https://discourse.vtk.org/t/vtk-9-build-help/7267 "2023-05-03T20:01:16Z")

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Hi I’m trying to build vtk 9 with the python wrapper and including some modules I need (in particular the vtkDICOM), the mesa and building the static libraries. The aim is to be able to use the vtkGDCMImageReader or th…

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## [is there any method in vtk to highlight camera view or visible faces ?](https://discourse.vtk.org/t/is-there-any-method-in-vtk-to-highlight-camera-view-or-visible-faces/11366)

<div class="topic-metadata">

**Author:** [@Vipul\_Kumar](https://discourse.vtk.org/u/Vipul_Kumar)\
**Replies:** 0\
**Last updated:** [May 3, 2023, 12:36pm UTC](https://discourse.vtk.org/t/is-there-any-method-in-vtk-to-highlight-camera-view-or-visible-faces/11366 "2023-05-03T12:36:36Z")

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Basically , I am trying to use the given code to highlight the camera view faces ,but it is only culling the back faces, It’s also highlighting the hidden faces which is not expected .Here below is my code .can you help …

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## [Ray Tracing in VTK - Capabilities in surface and volume Rendering - Own Implementation](https://discourse.vtk.org/t/ray-tracing-in-vtk-capabilities-in-surface-and-volume-rendering-own-implementation/11308)

<div class="topic-metadata">

**Author:** [@DMelenberg](https://discourse.vtk.org/u/DMelenberg)\
**Replies:** 3\
**Last updated:** [May 2, 2023, 2:21pm UTC](https://discourse.vtk.org/t/ray-tracing-in-vtk-capabilities-in-surface-and-volume-rendering-own-implementation/11308 "2023-05-02T14:21:05Z")

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Hello All, I am new to the community and have only recently started reading up on vtk and need support on the possibilities of this great library. Namely, I want to develop my own ray tracer in Python using the vtk lib…

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## [Glyph3D filter but acting on polydata Vertices rather than points](https://discourse.vtk.org/t/glyph3d-filter-but-acting-on-polydata-vertices-rather-than-points/11305)

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**Author:** [@Matthieu](https://discourse.vtk.org/u/Matthieu)\
**Replies:** 5\
**Last updated:** [May 2, 2023, 9:48am UTC](https://discourse.vtk.org/t/glyph3d-filter-but-acting-on-polydata-vertices-rather-than-points/11305 "2023-05-02T09:48:10Z")

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Hi, is there a way to make the vtkGlyph3D filter acting on the Vertices (cells) of a polydata rather than the points ? I have a polydata with cells being triangles, lines, and vertices. I want a pipeline where I put tub…

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## [\[Solved\] Detect which fields/input were not changed](https://discourse.vtk.org/t/solved-detect-which-fields-input-were-not-changed/11353)

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**Author:** [@atalon-lip6](https://discourse.vtk.org/u/atalon-lip6)\
**Replies:** 1\
**Last updated:** [May 2, 2023, 10:06am UTC](https://discourse.vtk.org/t/solved-detect-which-fields-input-were-not-changed/11353 "2023-05-02T10:06:08Z")

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Hello, I am using vtk with paraview (but maybe without my question still has some meaning). I have a filter with let’s say a big distance matrix input and a small integer other parameter as a field. My case is the foll…

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## [Update actors in Activiz 9.2](https://discourse.vtk.org/t/update-actors-in-activiz-9-2/9443)

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**Author:** [@MarKara](https://discourse.vtk.org/u/MarKara)\
**Replies:** 3\
**Last updated:** [April 28, 2023, 12:13pm UTC](https://discourse.vtk.org/t/update-actors-in-activiz-9-2/9443 "2023-04-28T12:13:43Z")

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In my application I have a similar option as in Paraview “Hover over cells” to show cell property using balloon widget and highlight hovered cell using vtkExtractSelection to extract cell from grid and update actor. The…

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## [vtkRenderWindow from VTK 9.1.0 does not open from python 3.10.2 on M1 macbook on macOS 12.1](https://discourse.vtk.org/t/vtkrenderwindow-from-vtk-9-1-0-does-not-open-from-python-3-10-2-on-m1-macbook-on-macos-12-1/7971)

<div class="topic-metadata">

**Author:** [@pbaudin](https://discourse.vtk.org/u/pbaudin)\
**Replies:** 12\
**Last updated:** [April 28, 2023, 1:18am UTC](https://discourse.vtk.org/t/vtkrenderwindow-from-vtk-9-1-0-does-not-open-from-python-3-10-2-on-m1-macbook-on-macos-12-1/7971 "2023-04-28T01:18:51Z")

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This simple tutorial code will not run correctly on my computer https://kitware.github.io/vtk-examples/site/Python/Tutorial/Tutorial\_Step1/ I’m running in a conda environment with: python 3.10.2 vtk 9.1.0 on macOS M…

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## [clipping glyph3D, want matching colors](https://discourse.vtk.org/t/clipping-glyph3d-want-matching-colors/11335)

<div class="topic-metadata">

**Author:** [@Randy\_Heiland](https://discourse.vtk.org/u/Randy_Heiland)\
**Replies:** 0\
**Last updated:** [April 27, 2023, 10:08pm UTC](https://discourse.vtk.org/t/clipping-glyph3d-want-matching-colors/11335 "2023-04-27T22:08:25Z")

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Is it possible to easily color the clipped faces of glyph3D the same color as the glyph (colored by a scalar)? Maybe I’m missing something obvious. Here’s a minimal test. Instead of white faces, I’d like them to match th…

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## [Convex hull of set of points lying on a 3D plane](https://discourse.vtk.org/t/convex-hull-of-set-of-points-lying-on-a-3d-plane/11277)

<div class="topic-metadata">

**Author:** [@kruvva](https://discourse.vtk.org/u/kruvva)\
**Replies:** 6\
**Last updated:** [April 27, 2023, 12:22am UTC](https://discourse.vtk.org/t/convex-hull-of-set-of-points-lying-on-a-3d-plane/11277 "2023-04-27T00:22:52Z")

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Hi, How do I find the boundary of point cloud lying on a 3D plane. This plane is not parallel to XY or YZ or ZX planes. I am looking for the polygon on the plane that surrounds the point cloud. vtkConvexHull2D is supress…

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## [vtkRenderWindow setDeviceIndex not worked?](https://discourse.vtk.org/t/vtkrenderwindow-setdeviceindex-not-worked/11311)

<div class="topic-metadata">

**Author:** [@Peng\_LEE](https://discourse.vtk.org/u/Peng_LEE)\
**Replies:** 1\
**Last updated:** [April 26, 2023, 10:59pm UTC](https://discourse.vtk.org/t/vtkrenderwindow-setdeviceindex-not-worked/11311 "2023-04-26T22:59:17Z")

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Dear all: When there are four graphic cards in my linux server, the type of card is: RTX 2070. And If I set the device index 0, to my vtkRenderWindow(), and then render by rotate. And When I open nvidia-smi mode and d…

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## [How to translate a volume with changing the data](https://discourse.vtk.org/t/how-to-translate-a-volume-with-changing-the-data/11251)

<div class="topic-metadata">

**Author:** [@MKRangers](https://discourse.vtk.org/u/MKRangers)\
**Replies:** 10\
**Last updated:** [April 26, 2023, 10:37pm UTC](https://discourse.vtk.org/t/how-to-translate-a-volume-with-changing-the-data/11251 "2023-04-26T22:37:41Z")

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Hi, I need to translate my volume in the rendering space, and I need to change the whole underlying data, not just showing the volume at the desired coordinate. My volume data is stored in a vtkImageAlgorithm class (vtk…

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## [the .vtu file to be generated is too big](https://discourse.vtk.org/t/the-vtu-file-to-be-generated-is-too-big/11290)

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**Author:** [@meng\_deng](https://discourse.vtk.org/u/meng_deng)\
**Replies:** 2\
**Last updated:** [April 26, 2023, 6:57pm UTC](https://discourse.vtk.org/t/the-vtu-file-to-be-generated-is-too-big/11290 "2023-04-26T18:57:22Z")

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I tried to use points and cell values to generate a hexahedral mesh with Python. But the final file was too large to store(\>40 GB, ) and the program crashed, size of the data is 164640(56 \* 60 \* 49). data.rar (882.1 KB) …

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## [vtkDecimatePro sensitivity: subject to floating-point error and scale](https://discourse.vtk.org/t/vtkdecimatepro-sensitivity-subject-to-floating-point-error-and-scale/11292)

<div class="topic-metadata">

**Author:** [@Maximilien\_Mayya](https://discourse.vtk.org/u/Maximilien_Mayya)\
**Replies:** 4\
**Last updated:** [April 26, 2023, 1:01pm UTC](https://discourse.vtk.org/t/vtkdecimatepro-sensitivity-subject-to-floating-point-error-and-scale/11292 "2023-04-26T13:01:10Z")

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Hi, vtkDecimatePro seems to have slightly different outputs for the “same” input: vtkSmartPointer\<vtkPolyData\> createSphere( const double\* center, const double radius, const int phiRes = 30, const int the…

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## [Getting Module not found error](https://discourse.vtk.org/t/getting-module-not-found-error/11289)

<div class="topic-metadata">

**Author:** [@Kevin\_Sweeney](https://discourse.vtk.org/u/Kevin_Sweeney)\
**Replies:** 1\
**Last updated:** [April 26, 2023, 11:26am UTC](https://discourse.vtk.org/t/getting-module-not-found-error/11289 "2023-04-26T11:26:21Z")

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I am trying to add the code from this demo into my project. However, it is failing to find the two imported modules. Errors: Module not found: Error: Can't resolve 'vtk.js/Interaction/Manipulators' in '/.../.../itk-vt…

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## [Error: GLSL 1.50 is not supported](https://discourse.vtk.org/t/error-glsl-1-50-is-not-supported/11281)

<div class="topic-metadata">

**Author:** [@wulawula](https://discourse.vtk.org/u/wulawula)\
**Replies:** 3\
**Last updated:** [April 25, 2023, 2:27pm UTC](https://discourse.vtk.org/t/error-glsl-1-50-is-not-supported/11281 "2023-04-25T14:27:41Z")

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I get an error when I run mfix on my Linux system, does anyone know how to fix it

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## [CMake flags used to compile Python wheel](https://discourse.vtk.org/t/cmake-flags-used-to-compile-python-wheel/10940)

<div class="topic-metadata">

**Author:** [@ffrancesco94](https://discourse.vtk.org/u/ffrancesco94)\
**Replies:** 4\
**Last updated:** [April 25, 2023, 12:02pm UTC](https://discourse.vtk.org/t/cmake-flags-used-to-compile-python-wheel/10940 "2023-04-25T12:02:13Z")

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Hi, I was trying to go through the .ci/\*.cmake files to understand how exactly the Python3 wheels (mainly interested in Linux) are generated, but I found that many optional flags are not mentioned (thus I’m assuming set…

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