# Latest

**URL:** https://discourse.vtk.org/latest.md?page=233

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

**Page:** 234

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## [Smooth (Gouraud) shading disappears in 8.2](https://discourse.vtk.org/t/smooth-gouraud-shading-disappears-in-8-2/2017)

<div class="topic-metadata">

**Author:** [@Jellby](https://discourse.vtk.org/u/Jellby)\
**Replies:** 13\
**Last updated:** [November 4, 2019, 4:33pm UTC](https://discourse.vtk.org/t/smooth-gouraud-shading-disappears-in-8-2/2017 "2019-11-04T16:33:30Z")

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I have an application working fine with python and VTK 8.1.2 (https://gitlab.com/Jellby/Pegamoid). Now I wanted to try something else (TTK), and I installed a new conda environment with vtk 8.2. The application still wo…

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

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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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## [Issue with vtkPointDataToCellData filter with Categorical Data option](https://discourse.vtk.org/t/issue-with-vtkpointdatatocelldata-filter-with-categorical-data-option/1970)

<div class="topic-metadata">

**Author:** [@acbauer](https://discourse.vtk.org/u/acbauer)\
**Replies:** 6\
**Last updated:** [November 4, 2019, 2:19pm UTC](https://discourse.vtk.org/t/issue-with-vtkpointdatatocelldata-filter-with-categorical-data-option/1970 "2019-11-04T14:19:14Z")

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When the CategoricalData option of the vtkPointDataToCellData filter is selected then in certain cases there are no cell data arrays created from this filter. Looking at vtkPointDataToCellData.cxx, specifically the else …

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## [Floor & Room Planner](https://discourse.vtk.org/t/floor-room-planner/2035)

<div class="topic-metadata">

**Author:** [@ramumaheswaran](https://discourse.vtk.org/u/ramumaheswaran)\
**Replies:** 1\
**Last updated:** [November 4, 2019, 2:14pm UTC](https://discourse.vtk.org/t/floor-room-planner/2035 "2019-11-04T14:14:28Z")

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Does VTK supports 3D modelling of linking floor planner (CAD like Designs) and 3D objects(furnitures)?

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

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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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## [Paraview Glance: No color mapping when data array name contains colon](https://discourse.vtk.org/t/paraview-glance-no-color-mapping-when-data-array-name-contains-colon/2022)

<div class="topic-metadata">

**Author:** [@lukas](https://discourse.vtk.org/u/lukas)\
**Replies:** 3\
**Last updated:** [November 1, 2019, 7:29pm UTC](https://discourse.vtk.org/t/paraview-glance-no-color-mapping-when-data-array-name-contains-colon/2022 "2019-11-01T19:29:45Z")

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Hello, I have encountered the following problem: When a data array in a vtkjs file contains a colon in the array name (e.g. “Values: A”), the color mapping does not work in Paraview Glance. I.e. the mesh is displayed…

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

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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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## [Issue with TubeFilter when setting normals to polydata (vtk.js)](https://discourse.vtk.org/t/issue-with-tubefilter-when-setting-normals-to-polydata-vtk-js/2019)

<div class="topic-metadata">

**Author:** [@anon10073585](https://discourse.vtk.org/u/anon10073585)\
**Replies:** 0\
**Last updated:** [October 31, 2019, 7:17pm UTC](https://discourse.vtk.org/t/issue-with-tubefilter-when-setting-normals-to-polydata-vtk-js/2019 "2019-10-31T19:17:28Z")

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I can set my own normals to a polydata (lines) in vtk.js, and it works fine. But when I try to use a TubeFilter with said polydata, it doesn’t work; I can only generate the tube if I don’t set the normals. The program do…

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

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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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## [vtkJSONDataSetWriter crashes when CellData contains StringArray](https://discourse.vtk.org/t/vtkjsondatasetwriter-crashes-when-celldata-contains-stringarray/2005)

<div class="topic-metadata">

**Author:** [@lukas](https://discourse.vtk.org/u/lukas)\
**Replies:** 2\
**Last updated:** [October 31, 2019, 2:56pm UTC](https://discourse.vtk.org/t/vtkjsondatasetwriter-crashes-when-celldata-contains-stringarray/2005 "2019-10-31T14:56:02Z")

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Hello, The vtkJSONDataSetWriter seems to have an issue, when the DataSet contains cell data with non-vtkDataArray (e.g. StringArray). This kind of DataSet causes Paraview to crash during “Export Scene”. Here is the tes…

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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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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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## [Remote modules vs external modules](https://discourse.vtk.org/t/remote-modules-vs-external-modules/2003)

<div class="topic-metadata">

**Author:** [@dgobbi](https://discourse.vtk.org/u/dgobbi)\
**Replies:** 12\
**Last updated:** [October 30, 2019, 8:17pm UTC](https://discourse.vtk.org/t/remote-modules-vs-external-modules/2003 "2019-10-30T20:17:29Z")

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Over the weekend, I started updating vtk-dicom to the new VTK 9 build system. For previous versions of VTK, it was possible to build vtk-dicom either as part of the VTK build (i.e. as a remote module, thanks to Bill Lor…

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## [Add an existing library to a VTK module](https://discourse.vtk.org/t/add-an-existing-library-to-a-vtk-module/2008)

<div class="topic-metadata">

**Author:** [@cobo](https://discourse.vtk.org/u/cobo)\
**Replies:** 2\
**Last updated:** [October 30, 2019, 6:20pm UTC](https://discourse.vtk.org/t/add-an-existing-library-to-a-vtk-module/2008 "2019-10-30T18:20:48Z")

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In a project I am generating a VTK module with vtk\_module\_add\_module(), to be built from a number of source files, and also to be linked with other modules with vtk\_module\_link(): one other self-built module, plus some Q…

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## [SetOpacity is not working correctly!](https://discourse.vtk.org/t/setopacity-is-not-working-correctly/1994)

<div class="topic-metadata">

**Author:** [@rai-sam](https://discourse.vtk.org/u/rai-sam)\
**Replies:** 6\
**Last updated:** [October 30, 2019, 2:41pm UTC](https://discourse.vtk.org/t/setopacity-is-not-working-correctly/1994 "2019-10-30T14:41:33Z")

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I am trying to set opacity for vtkActor but any value less than 1.0 makes it invisible completely. Opacity test example is working fine. What I am missing here? Using vtk 8.2.0.

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## [vtkexodusII project build faild](https://discourse.vtk.org/t/vtkexodusii-project-build-faild/1997)

<div class="topic-metadata">

**Author:** [@james](https://discourse.vtk.org/u/james)\
**Replies:** 5\
**Last updated:** [October 30, 2019, 2:20pm UTC](https://discourse.vtk.org/t/vtkexodusii-project-build-faild/1997 "2019-10-30T14:20:59Z")

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I got a lot of errors when compiling vtk8.2 on Windows10, all from vtkexodusII project。 vtk\\VTK-8.2.0\\ThirdParty\\exodusII\\vtkexodusII\\src\\ex\_utils.c(1415): error C2065: “func”

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

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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)

<div class="topic-metadata">

**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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