# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=146

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

**Page:** 147

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## [Installation problem with Linux](https://discourse.vtk.org/t/installation-problem-with-linux/2032)

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**Author:** [@MatHub](https://discourse.vtk.org/u/MatHub)\
**Replies:** 5\
**Last updated:** [November 4, 2019, 3:11pm UTC](https://discourse.vtk.org/t/installation-problem-with-linux/2032 "2019-11-04T15:11:31Z")

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Hey! I´m new to VTK, I will mostly use it for simulations with LIGGGHTS and I encountered a few problems when installing it. It seems that when compiling LIGGGHTS, no “Major” version of VTK is found. The weird thing is …

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## [Undefined symbols vtkConvertSelection::ToSelectionType when building master on OSX, static lib](https://discourse.vtk.org/t/undefined-symbols-vtkconvertselection-toselectiontype-when-building-master-on-osx-static-lib/1878)

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**Author:** [@simonesneault](https://discourse.vtk.org/u/simonesneault)\
**Replies:** 4\
**Last updated:** [November 4, 2019, 3:09pm UTC](https://discourse.vtk.org/t/undefined-symbols-vtkconvertselection-toselectiontype-when-building-master-on-osx-static-lib/1878 "2019-11-04T15:09:30Z")

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Hello, I’m having trouble building our app against VTK master on OSX, It fails with that error while linking : Undefined symbols for architecture x86\_64: "vtkConvertSelection::ToSelectionType(vtkSelection\*, vtkDataOb…

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## [Black square artefacts on OSX with recent iris graphic cards, with GPU volume rendering](https://discourse.vtk.org/t/black-square-artefacts-on-osx-with-recent-iris-graphic-cards-with-gpu-volume-rendering/2016)

<div class="topic-metadata">

**Author:** [@simonesneault](https://discourse.vtk.org/u/simonesneault)\
**Replies:** 3\
**Last updated:** [November 4, 2019, 2:29pm UTC](https://discourse.vtk.org/t/black-square-artefacts-on-osx-with-recent-iris-graphic-cards-with-gpu-volume-rendering/2016 "2019-11-04T14:29:51Z")

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Hello, After the migration to a recent VTK version, some users of our app began to see some small black artefacts on the volume rendering view (see attachment image). When they rotate the view it disappears. This can b…

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## [vtk "make polygon more dense" ?](https://discourse.vtk.org/t/vtk-make-polygon-more-dense/2027)

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**Author:** [@DominionSoftware](https://discourse.vtk.org/u/DominionSoftware)\
**Replies:** 3\
**Last updated:** [November 3, 2019, 4:51pm UTC](https://discourse.vtk.org/t/vtk-make-polygon-more-dense/2027 "2019-11-03T16:51:47Z")

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I’d like to make a cylinder more “solid”. Is there a filter or algorithm for that in VTK? I suppose an algorithm to make a mesh that connects the points on the outer edge of the cylinder to fill the inside with triangle…

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## [reverse X-axis in vtk charts](https://discourse.vtk.org/t/reverse-x-axis-in-vtk-charts/2029)

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**Author:** [@Zolo](https://discourse.vtk.org/u/Zolo)\
**Replies:** 0\
**Last updated:** [November 3, 2019, 8:49am UTC](https://discourse.vtk.org/t/reverse-x-axis-in-vtk-charts/2029 "2019-11-03T08:49:52Z")

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Hi, I am trying to change the sense of the X axis in a vtk chart. I would like that the axis decreases from left to right. Is this possible? I already tried this: bottom-\>SetRange(Xaxis.back(),Xaxis.front()); but no s…

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## [font size in vtk Charts and Plots](https://discourse.vtk.org/t/font-size-in-vtk-charts-and-plots/2002)

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**Author:** [@Zolo](https://discourse.vtk.org/u/Zolo)\
**Replies:** 1\
**Last updated:** [November 3, 2019, 8:42am UTC](https://discourse.vtk.org/t/font-size-in-vtk-charts-and-plots/2002 "2019-11-03T08:42:27Z")

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Dear VTK users, I have compiled both VTK-7.1.1 and VTK-8.1.2 on MacOS Catalina and both versions run smoothly and all the examples compile and run. I am using VTK at the moment to produce some 2D plots (scatter and line…

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## [Rotate view angle of camera](https://discourse.vtk.org/t/rotate-view-angle-of-camera/1573)

<div class="topic-metadata">

**Author:** [@anon64829896](https://discourse.vtk.org/u/anon64829896)\
**Replies:** 1\
**Last updated:** [November 2, 2019, 5:47pm UTC](https://discourse.vtk.org/t/rotate-view-angle-of-camera/1573 "2019-11-02T17:47:39Z")

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Hi, I know that this topic seems simple but however I am getting an unexpected result from it. My process looks like this: Using the vtkOBJReader to read an obj file Actor -\> vtkRenderer -\> vtkRenderWindow -\> vtkRend…

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## [The triangle orientation of Constrain vtkDelaunay2D](https://discourse.vtk.org/t/the-triangle-orientation-of-constrain-vtkdelaunay2d/2023)

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**Author:** [@tdchen](https://discourse.vtk.org/u/tdchen)\
**Replies:** 0\
**Last updated:** [November 2, 2019, 4:14am UTC](https://discourse.vtk.org/t/the-triangle-orientation-of-constrain-vtkdelaunay2d/2023 "2019-11-02T04:14:46Z")

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Hi vtkers. I made a polygon triangulation with Constrain vtkDelaunay2D. But I found the orientation of resulting triangles were not the same. The boundary triangles have orientations that consistent with boundary edg…

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## [Help installing VTK with pip](https://discourse.vtk.org/t/help-installing-vtk-with-pip/1847)

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**Author:** [@DeAunna](https://discourse.vtk.org/u/DeAunna)\
**Replies:** 3\
**Last updated:** [November 1, 2019, 4:39pm UTC](https://discourse.vtk.org/t/help-installing-vtk-with-pip/1847 "2019-11-01T16:39:08Z")

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Hello, I’ve been trying to install mayavi using pip but I get the following error: Error: Could not find a version that satisfies the requirement vtk (from mayavi) from (from versions: none) Error: No matching distrib…

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## [Align marching cube output to volume image using image header information](https://discourse.vtk.org/t/align-marching-cube-output-to-volume-image-using-image-header-information/2020)

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**Author:** [@ysuter](https://discourse.vtk.org/u/ysuter)\
**Replies:** 7\
**Last updated:** [November 1, 2019, 4:16pm UTC](https://discourse.vtk.org/t/align-marching-cube-output-to-volume-image-using-image-header-information/2020 "2019-11-01T16:16:34Z")

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Dear all, I am stuck with an issue that’s probably related to the combination of VTK, SimpleITK, and 3DSlicer, any hints highly appreciated. I am using Python. What I am trying to do: Load a segmentation from a Nift…

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## [Using TBB with VTK](https://discourse.vtk.org/t/using-tbb-with-vtk/1958)

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**Author:** [@Seun](https://discourse.vtk.org/u/Seun)\
**Replies:** 11\
**Last updated:** [November 1, 2019, 3:56pm UTC](https://discourse.vtk.org/t/using-tbb-with-vtk/1958 "2019-11-01T15:56:00Z")

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Hello everyone, I was wondering if someone could point me in the right direction as to how to use TBB with VTK correctly. I managed to build VTK with TBB using cmake (if am correct, I had the VTK\_SMP\_IMPLEMENTATION\_TYPE…

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## [Clipping an stl with a cylinder](https://discourse.vtk.org/t/clipping-an-stl-with-a-cylinder/2012)

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**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 4\
**Last updated:** [October 31, 2019, 5:41pm UTC](https://discourse.vtk.org/t/clipping-an-stl-with-a-cylinder/2012 "2019-10-31T17:41:34Z")

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Hi !! I have a doubt i try to make a hole to a polydata (stl) given a cylinder but the resulting hole is not smooth. Screenshot\_1|552x500 I have also tried vtkBooleanOperationPolyDataFilter but it is very very slow. …

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## [No QtVTKWidget found in Qt creator](https://discourse.vtk.org/t/no-qtvtkwidget-found-in-qt-creator/2015)

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**Author:** [@Pooja](https://discourse.vtk.org/u/Pooja)\
**Replies:** 2\
**Last updated:** [October 31, 2019, 3:25pm UTC](https://discourse.vtk.org/t/no-qtvtkwidget-found-in-qt-creator/2015 "2019-10-31T15:25:33Z")

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Hello, I have installed VTK 8.2.0 with Qt 5.12.5(with msvc2017 for 64 bit). I have also copied QVTKWidgetPlugin.dll from VTK directory to Qt plugins folder. But still there is no QVTKWidget in Qt creator application. Cou…

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## [QVTKOpenGLNativeWidget confusion](https://discourse.vtk.org/t/qvtkopenglnativewidget-confusion/2010)

<div class="topic-metadata">

**Author:** [@DominionSoftware](https://discourse.vtk.org/u/DominionSoftware)\
**Replies:** 2\
**Last updated:** [October 31, 2019, 1:00pm UTC](https://discourse.vtk.org/t/qvtkopenglnativewidget-confusion/2010 "2019-10-31T13:00:42Z")

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I see VTK has changed it’s Qt integration. I’m confused about how to create a multiple widget (e.g. 4 up ) medical imaging windows. Do I have 1 vtkGenericOpenGLRenderWindow shared between multiple QVTKOpenGLNativeWidget…

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## [A problem about surface smoothing](https://discourse.vtk.org/t/a-problem-about-surface-smoothing/2011)

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**Author:** [@KeyboardMan](https://discourse.vtk.org/u/KeyboardMan)\
**Replies:** 4\
**Last updated:** [October 31, 2019, 8:57am UTC](https://discourse.vtk.org/t/a-problem-about-surface-smoothing/2011 "2019-10-31T08:57:18Z")

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I used vtkPolyDataBooleanFilter for Boolean operation vtkPolyDataBooleanFilter Before the Boolean operation This surface looks very smooth But after the Boolean operation Why is that? Is there a solut…

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## [Integration of third party DICOM Reader with VTK.](https://discourse.vtk.org/t/integration-of-third-party-dicom-reader-with-vtk/1969)

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**Author:** [@Yongun\_Lee](https://discourse.vtk.org/u/Yongun_Lee)\
**Replies:** 4\
**Last updated:** [October 31, 2019, 5:37am UTC](https://discourse.vtk.org/t/integration-of-third-party-dicom-reader-with-vtk/1969 "2019-10-31T05:37:27Z")

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Hello, our company has our own DICOM Reader. (MFC) This DICOM Reader allows some non-standard DICOM files. I want to read the DICOM file through this DICOM Reader and pass the PixelData and Image information to the VTK…

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## [vtk application deployment](https://discourse.vtk.org/t/vtk-application-deployment/1992)

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**Author:** [@naffrancois](https://discourse.vtk.org/u/naffrancois)\
**Replies:** 2\
**Last updated:** [October 30, 2019, 2:14pm UTC](https://discourse.vtk.org/t/vtk-application-deployment/1992 "2019-10-30T14:14:04Z")

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Hello, I successfully wrote a java application with vtk on my development machine. I generated an executable jar file with netbeans which works nicely in different locations of C: drive (with different dll path and vtk.…

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## [Configuring VTK with Qt in windows](https://discourse.vtk.org/t/configuring-vtk-with-qt-in-windows/1999)

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**Author:** [@Pooja](https://discourse.vtk.org/u/Pooja)\
**Replies:** 9\
**Last updated:** [October 30, 2019, 9:16am UTC](https://discourse.vtk.org/t/configuring-vtk-with-qt-in-windows/1999 "2019-10-30T09:16:34Z")

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Hello, I have installed Qt 5.12.5 on my Wiindows 10 computer. I also have VTK 8.2.0 and cmake. I have followed following tutorial. https://vtk.org/Wiki/VTK/Configure\_and\_Build I have compiled the VTK using cmake gui…

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## [Changing vtkScalarBarActor title justification has no effect](https://discourse.vtk.org/t/changing-vtkscalarbaractor-title-justification-has-no-effect/2001)

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**Author:** [@msmerps](https://discourse.vtk.org/u/msmerps)\
**Replies:** 0\
**Last updated:** [October 29, 2019, 4:38pm UTC](https://discourse.vtk.org/t/changing-vtkscalarbaractor-title-justification-has-no-effect/2001 "2019-10-29T16:38:15Z")

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Hi all, I’ve translated this example of vtkScalarBarActor into C#: https://vtk.org/Wiki/VTK/Examples/Cxx/Visualization/ScalarBarActor And am trying to change the left-right justification of the title text from “left” …

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## [use vtk8.2.0 for the project which was developed based on VTK5.8 before](https://discourse.vtk.org/t/use-vtk8-2-0-for-the-project-which-was-developed-based-on-vtk5-8-before/1983)

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**Author:** [@Yixun\_Liu](https://discourse.vtk.org/u/Yixun_Liu)\
**Replies:** 2\
**Last updated:** [October 29, 2019, 1:19am UTC](https://discourse.vtk.org/t/use-vtk8-2-0-for-the-project-which-was-developed-based-on-vtk5-8-before/1983 "2019-10-29T01:19:33Z")

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Hi All, I used VTK5.8 in my project before and want to replace it with VTK8.2. How to build VTK8.2 to make it back compatible, so I do not need to make many codes change. Thanks a lot. YL

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## [Molecule builder/ Molecule representation to interact with user.](https://discourse.vtk.org/t/molecule-builder-molecule-representation-to-interact-with-user/1988)

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**Author:** [@pali08](https://discourse.vtk.org/u/pali08)\
**Replies:** 0\
**Last updated:** [October 27, 2019, 11:10pm UTC](https://discourse.vtk.org/t/molecule-builder-molecule-representation-to-interact-with-user/1988 "2019-10-27T23:10:51Z")

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Hello all, I am working on program in which user can build molecule and measure distances between atom (among other things). Example use case: User have some hydrocarbon drawn in render window. Clicking H atom will r…

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## [How to compute the intersection of a segment with a tetrahedron](https://discourse.vtk.org/t/how-to-compute-the-intersection-of-a-segment-with-a-tetrahedron/1984)

<div class="topic-metadata">

**Author:** [@ztdep](https://discourse.vtk.org/u/ztdep)\
**Replies:** 1\
**Last updated:** [October 26, 2019, 2:01pm UTC](https://discourse.vtk.org/t/how-to-compute-the-intersection-of-a-segment-with-a-tetrahedron/1984 "2019-10-26T14:01:33Z")

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Dear sir: I want to know the intersection points of a segment and a tetrahedron. which API can resolve this. Regards

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## [How to save a vertex data in 2D numpy array into a text vtk file in Python?](https://discourse.vtk.org/t/how-to-save-a-vertex-data-in-2d-numpy-array-into-a-text-vtk-file-in-python/1973)

<div class="topic-metadata">

**Author:** [@leonard-oz](https://discourse.vtk.org/u/leonard-oz)\
**Replies:** 1\
**Last updated:** [October 25, 2019, 3:24pm UTC](https://discourse.vtk.org/t/how-to-save-a-vertex-data-in-2d-numpy-array-into-a-text-vtk-file-in-python/1973 "2019-10-25T15:24:32Z")

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Dear VTK experts: I have a mesh vertex data which is in 2D numpy array format, how could I save it into a text vtk file in Python? Sorry I am very new to VTK . Thanks.

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## [How to write cell centred data field to an unstructred grid.](https://discourse.vtk.org/t/how-to-write-cell-centred-data-field-to-an-unstructred-grid/1965)

<div class="topic-metadata">

**Author:** [@ztdep](https://discourse.vtk.org/u/ztdep)\
**Replies:** 1\
**Last updated:** [October 25, 2019, 2:19pm UTC](https://discourse.vtk.org/t/how-to-write-cell-centred-data-field-to-an-unstructred-grid/1965 "2019-10-25T14:19:35Z")

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Dear sir: I need to output my cfd data in a FVM way.How to write cell centred data field to an unstructred grid. Regards

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## [Elevation terrain with tiled texture](https://discourse.vtk.org/t/elevation-terrain-with-tiled-texture/1615)

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**Author:** [@tbenega](https://discourse.vtk.org/u/tbenega)\
**Replies:** 6\
**Last updated:** [October 23, 2019, 7:00pm UTC](https://discourse.vtk.org/t/elevation-terrain-with-tiled-texture/1615 "2019-10-23T19:00:46Z")

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Hello guys, Is it possible to render a terrain with a texture like this example: https://kitware.github.io/vtk-js/examples/ElevationReader.html, but with tiled format image (multiple images)? We have the web service t…

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## [How to properly clean a polydata with duplicated points](https://discourse.vtk.org/t/how-to-properly-clean-a-polydata-with-duplicated-points/1956)

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**Author:** [@Paolo\_Lampitella](https://discourse.vtk.org/u/Paolo_Lampitella)\
**Replies:** 4\
**Last updated:** [October 22, 2019, 9:20am UTC](https://discourse.vtk.org/t/how-to-properly-clean-a-polydata-with-duplicated-points/1956 "2019-10-22T09:20:37Z")

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Dear all, I’m a super-casual C++/VTK user and this is my first post here, so excuse my possible naivety, especially in coding (my daily job involves Fortran). I have troubles in understanding what is the proper way to …

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## [Recoloring](https://discourse.vtk.org/t/recoloring/1951)

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**Author:** [@gib](https://discourse.vtk.org/u/gib)\
**Replies:** 0\
**Last updated:** [October 20, 2019, 3:14am UTC](https://discourse.vtk.org/t/recoloring/1951 "2019-10-20T03:14:25Z")

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Starting from a set of 3D points, I generate a 2D triangular unstructured grid in a vtkPolyData and use the z values to assign colors to the points, using a vtkLookupTable. The vtkPolyData is then rendered as a surface.…

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## [vtkImageReslice "Fills Background" with Zeros. How Can I Change this Behavior?](https://discourse.vtk.org/t/vtkimagereslice-fills-background-with-zeros-how-can-i-change-this-behavior/1882)

<div class="topic-metadata">

**Author:** [@MichelleKline](https://discourse.vtk.org/u/MichelleKline)\
**Replies:** 10\
**Last updated:** [October 18, 2019, 10:18pm UTC](https://discourse.vtk.org/t/vtkimagereslice-fills-background-with-zeros-how-can-i-change-this-behavior/1882 "2019-10-18T22:18:55Z")

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Hello, I have a DICOM volume that was acquired in a double-oblique orientation on the scanner. After reading the DICOM using vtkDICOMImageReader, I pipe the volume through vtkImageReslice, then use the DICOM image attr…

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## [Render window output is black when I use vtkGPUVolumeRayCastMapper python](https://discourse.vtk.org/t/render-window-output-is-black-when-i-use-vtkgpuvolumeraycastmapper-python/1938)

<div class="topic-metadata">

**Author:** [@kimia.af1998](https://discourse.vtk.org/u/kimia.af1998)\
**Replies:** 14\
**Last updated:** [October 18, 2019, 7:06pm UTC](https://discourse.vtk.org/t/render-window-output-is-black-when-i-use-vtkgpuvolumeraycastmapper-python/1938 "2019-10-18T19:06:28Z")

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Hi I use vtkGPUVolumeRayCastMapper to render a DICOM volume. The output window is black but when I use vtkFixedPointVolumeRayCastMapper it works and volume will be displayed. I also use QVTKRenderWindowInteractor widge…

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## [Applied transformation matrix of vtkProcrustesAlignmentFilter in similarity mode](https://discourse.vtk.org/t/applied-transformation-matrix-of-vtkprocrustesalignmentfilter-in-similarity-mode/1948)

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**Author:** [@jonas](https://discourse.vtk.org/u/jonas)\
**Replies:** 0\
**Last updated:** [October 18, 2019, 10:02am UTC](https://discourse.vtk.org/t/applied-transformation-matrix-of-vtkprocrustesalignmentfilter-in-similarity-mode/1948 "2019-10-18T10:02:17Z")

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Hi, Is there a way to retrieve the transformation matrix that is applied by the vtkProcrustesAlignmentFilter? We want to apply this filter to align 2 shapes (meshes of 10.000 corresponding points) on each other in simi…

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