# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=147

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

**Page:** 148

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## [how to run vtkCollisionDetectionFilter with VTK 8.2.0?](https://discourse.vtk.org/t/how-to-run-vtkcollisiondetectionfilter-with-vtk-8-2-0/1946)

<div class="topic-metadata">

**Author:** [@rai-sam](https://discourse.vtk.org/u/rai-sam)\
**Replies:** 0\
**Last updated:** [October 18, 2019, 7:22am UTC](https://discourse.vtk.org/t/how-to-run-vtkcollisiondetectionfilter-with-vtk-8-2-0/1946 "2019-10-18T07:22:51Z")

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I want to highlight collision areas of actors. How I can implement vtkCollisionDetectionFilter with VTK 8.2.0? If No, when we will be getting the next version release? Because I am also interested to use: actor-\>GetPro…

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## [How to use polydata to cut polydata？](https://discourse.vtk.org/t/how-to-use-polydata-to-cut-polydata/1940)

<div class="topic-metadata">

**Author:** [@KeyboardMan](https://discourse.vtk.org/u/KeyboardMan)\
**Replies:** 2\
**Last updated:** [October 18, 2019, 5:18am UTC](https://discourse.vtk.org/t/how-to-use-polydata-to-cut-polydata/1940 "2019-10-18T05:18:22Z")

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I tried using vtkBooleanOprationPolydataFilter, but the effect was not good. Is there any other way to use it?

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## [Translucent texture for texture coordinates outside \[0,1\]](https://discourse.vtk.org/t/translucent-texture-for-texture-coordinates-outside-0-1/1791)

<div class="topic-metadata">

**Author:** [@drpeterfranz](https://discourse.vtk.org/u/drpeterfranz)\
**Replies:** 17\
**Last updated:** [October 18, 2019, 4:20am UTC](https://discourse.vtk.org/t/translucent-texture-for-texture-coordinates-outside-0-1/1791 "2019-10-18T04:20:43Z")

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I have a 3D geological model. I would now like to project a 2D map onto its surface; however the map only covers some parts of the 3D model surface. Currently I have set repetition off; but the effect is that parts of th…

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## [VTK performance comparison using Quadro and Geforce cards](https://discourse.vtk.org/t/vtk-performance-comparison-using-quadro-and-geforce-cards/1942)

<div class="topic-metadata">

**Author:** [@JoseJaramillo](https://discourse.vtk.org/u/JoseJaramillo)\
**Replies:** 8\
**Last updated:** [October 18, 2019, 3:04am UTC](https://discourse.vtk.org/t/vtk-performance-comparison-using-quadro-and-geforce-cards/1942 "2019-10-18T03:04:24Z")

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Hi all, Has someone recently compared a Quadro vs a Geforce card with similar specs to see if VTK performance improves? If so, any feedback would be appreciated. Thanks!

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## [Possible to use different interaction styles across viewports?](https://discourse.vtk.org/t/possible-to-use-different-interaction-styles-across-viewports/1926)

<div class="topic-metadata">

**Author:** [@banesullivan](https://discourse.vtk.org/u/banesullivan)\
**Replies:** 3\
**Last updated:** [October 17, 2019, 9:07pm UTC](https://discourse.vtk.org/t/possible-to-use-different-interaction-styles-across-viewports/1926 "2019-10-17T21:07:39Z")

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When having several viewports in one vtkRenderWindowInteractor, is it possible to set a different interactor style for each viewport such that one viewport shows a renderer with trackball style and another shows with ima…

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## [Cannot Control Opacity of vtkImageActors](https://discourse.vtk.org/t/cannot-control-opacity-of-vtkimageactors/1943)

<div class="topic-metadata">

**Author:** [@MichelleKline](https://discourse.vtk.org/u/MichelleKline)\
**Replies:** 8\
**Last updated:** [October 17, 2019, 8:48pm UTC](https://discourse.vtk.org/t/cannot-control-opacity-of-vtkimageactors/1943 "2019-10-17T20:48:44Z")

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Hello, I am displaying one image overlaying another image in a vtkRenderWindow. I do so by using vtkImageActor. Prior to adding each vtkImageActor to the vtkRenderer, each image has been mapped through vtkImageMapToCo…

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## [vtkPoissonReconstruction (vtkPCANormalEstimation) errors, flipped surface normals](https://discourse.vtk.org/t/vtkpoissonreconstruction-vtkpcanormalestimation-errors-flipped-surface-normals/1939)

<div class="topic-metadata">

**Author:** [@sbucc](https://discourse.vtk.org/u/sbucc)\
**Replies:** 0\
**Last updated:** [October 16, 2019, 5:43pm UTC](https://discourse.vtk.org/t/vtkpoissonreconstruction-vtkpcanormalestimation-errors-flipped-surface-normals/1939 "2019-10-16T17:43:17Z")

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Hi, I’m using vtkPoissonReconstruction to rebuild a mesh, with code that pretty much copies the example in https://lorensen.github.io/VTKExamples/site/Cxx/Points/PoissonExtractSurface/. It works fine on most input meshes…

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## [vtk compile error on embedded linux](https://discourse.vtk.org/t/vtk-compile-error-on-embedded-linux/1912)

<div class="topic-metadata">

**Author:** [@emily-5728](https://discourse.vtk.org/u/emily-5728)\
**Replies:** 5\
**Last updated:** [October 16, 2019, 1:23pm UTC](https://discourse.vtk.org/t/vtk-compile-error-on-embedded-linux/1912 "2019-10-16T13:23:35Z")

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hello， I want to use the vtk library on the am5728 (armv7 core, run linux operating system) chip and use cmake-gui for cross-compilation on Ubuntu. The compiler prompts: system is unknown to make, for arm\_linux\_gnueab…

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## [error](https://discourse.vtk.org/t/error/1936)

<div class="topic-metadata">

**Author:** [@kingming](https://discourse.vtk.org/u/kingming)\
**Replies:** 1\
**Last updated:** [October 16, 2019, 1:19pm UTC](https://discourse.vtk.org/t/error/1936 "2019-10-16T13:19:46Z")

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CMake Error at CMakeLists.txt:4 (FIND\_PACKAGE): By not providing “FindVTK.cmake” in CMAKE\_MODULE\_PATH this project has asked CMake to find a package configuration file provided by “VTK”, but CMake did not find one. C…

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## [Where is \_\_VTK\_WRAP\_\_ defined?](https://discourse.vtk.org/t/where-is-vtk-wrap-defined/1917)

<div class="topic-metadata">

**Author:** [@toddy](https://discourse.vtk.org/u/toddy)\
**Replies:** 2\
**Last updated:** [October 12, 2019, 11:51pm UTC](https://discourse.vtk.org/t/where-is-vtk-wrap-defined/1917 "2019-10-12T23:51:30Z")

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Building from VTK master with MSVC on Windows, VTK\_WRAP seems to be defined in vtkWrappingHints.h. How/where do I turn it off? If I turn off VTK\_MODULE\_ENABLE\_VTK\_WrappingTools in cmake I get an error cannot open file…

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## [vtkResampleToImage ignore hidden cells in vtkSmartVolumeMapper](https://discourse.vtk.org/t/vtkresampletoimage-ignore-hidden-cells-in-vtksmartvolumemapper/1830)

<div class="topic-metadata">

**Author:** [@jal](https://discourse.vtk.org/u/jal)\
**Replies:** 4\
**Last updated:** [October 11, 2019, 11:46pm UTC](https://discourse.vtk.org/t/vtkresampletoimage-ignore-hidden-cells-in-vtksmartvolumemapper/1830 "2019-10-11T23:46:14Z")

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Hi, is it possible to ignore cells marked as hidden when doing volume rendering of the output of vtkResampleToImage? My pipeline is roughly: unstructuredgrid-\>ImageResample-\>smartvolumemapper. ResampleToImage seems to…

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## [Access time dependent PointData in vtkStructuredGrid](https://discourse.vtk.org/t/access-time-dependent-pointdata-in-vtkstructuredgrid/1893)

<div class="topic-metadata">

**Author:** [@joboog](https://discourse.vtk.org/u/joboog)\
**Replies:** 1\
**Last updated:** [October 11, 2019, 8:27pm UTC](https://discourse.vtk.org/t/access-time-dependent-pointdata-in-vtkstructuredgrid/1893 "2019-10-11T20:27:22Z")

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Dear vtk-users, I am using the vtk library in python to importe a netcdf file. The netcdf file contains data of two variables for different time steps. It will be converted into a vtkStructuredGrid The vtkStructuredG…

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## [Multiple viewport perspectives of a single vtkRenderer](https://discourse.vtk.org/t/multiple-viewport-perspectives-of-a-single-vtkrenderer/1891)

<div class="topic-metadata">

**Author:** [@banesullivan](https://discourse.vtk.org/u/banesullivan)\
**Replies:** 13\
**Last updated:** [October 11, 2019, 7:55pm UTC](https://discourse.vtk.org/t/multiple-viewport-perspectives-of-a-single-vtkrenderer/1891 "2019-10-11T19:55:22Z")

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Is it possible to have a render window with multiple viewports and have only one vtkRenderer instance that each of the viewports views from a different perspective? Currently, the only way I have been able to do this is…

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## [Export from VTK to LumionRT - with colors](https://discourse.vtk.org/t/export-from-vtk-to-lumionrt-with-colors/1895)

<div class="topic-metadata">

**Author:** [@Mskovmand](https://discourse.vtk.org/u/Mskovmand)\
**Replies:** 5\
**Last updated:** [October 11, 2019, 5:15am UTC](https://discourse.vtk.org/t/export-from-vtk-to-lumionrt-with-colors/1895 "2019-10-11T05:15:27Z")

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I’m trying to assist a colleague in creating some “interface” between VTK generated models and LumionRT, where we seek to extract a colored poly data mesh to Lumion, so far without success. I can easily extract this dat…

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## [How to replace Geovis module](https://discourse.vtk.org/t/how-to-replace-geovis-module/1522)

<div class="topic-metadata">

**Author:** [@tbenega](https://discourse.vtk.org/u/tbenega)\
**Replies:** 5\
**Last updated:** [October 11, 2019, 12:30am UTC](https://discourse.vtk.org/t/how-to-replace-geovis-module/1522 "2019-10-11T00:30:49Z")

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Hello guys, I’m new on VTK and I’m trying to reproduce the examples on the topic 9.1 Geographic Views and Representation on the Users Guide book using Python. The thing is it seems that Geovis was removed because I got…

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## [proj 6.2.0 compatibility?](https://discourse.vtk.org/t/proj-6-2-0-compatibility/1729)

<div class="topic-metadata">

**Author:** [@Richard\_Shaw](https://discourse.vtk.org/u/Richard_Shaw)\
**Replies:** 5\
**Last updated:** [October 10, 2019, 8:29pm UTC](https://discourse.vtk.org/t/proj-6-2-0-compatibility/1729 "2019-10-10T20:29:15Z")

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I’m trying to help out a fellow Fedora packager. I maintain FreeCAD for Fedora which uses vtk. One of it’s dependencies is of course proj which has been updated to 6.2.0. While trying to build vtk 8.2.0 with proj 6.2.0 …

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## [What’s the problem? Somebody help me](https://discourse.vtk.org/t/what-s-the-problem-somebody-help-me/1890)

<div class="topic-metadata">

**Author:** [@KeyboardMan](https://discourse.vtk.org/u/KeyboardMan)\
**Replies:** 8\
**Last updated:** [October 10, 2019, 12:30pm UTC](https://discourse.vtk.org/t/what-s-the-problem-somebody-help-me/1890 "2019-10-10T12:30:06Z")

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I made a mistake when using vtkBooleanOperationPolyDataFilter。 ERROR: In E:\\VTKLib\\VTK-8.2.0\\Common\\DataModel\\vtkPointLocator.cxx, line 866 vtkPointLocator (0x15aa4068): No points to subdivide Generic Warning: In E:\\…

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## [What's the problem? How to deal?](https://discourse.vtk.org/t/whats-the-problem-how-to-deal/1884)

<div class="topic-metadata">

**Author:** [@tdchen](https://discourse.vtk.org/u/tdchen)\
**Replies:** 4\
**Last updated:** [October 9, 2019, 10:28pm UTC](https://discourse.vtk.org/t/whats-the-problem-how-to-deal/1884 "2019-10-09T22:28:18Z")

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My program used to run quite fluently. It used the vtk7.1 static library. But today when it was running on a new server with win10, it shows the following error and than stopped: “ERROR: in …\\VTK\\Rendering\\OpenGL2\\vtk…

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## [Crash when using vtkQWidgetWidget](https://discourse.vtk.org/t/crash-when-using-vtkqwidgetwidget/1387)

<div class="topic-metadata">

**Author:** [@cpinter](https://discourse.vtk.org/u/cpinter)\
**Replies:** 7\
**Last updated:** [October 8, 2019, 5:09pm UTC](https://discourse.vtk.org/t/crash-when-using-vtkqwidgetwidget/1387 "2019-10-08T17:09:36Z")

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Hi all, I’m trying to use the relatively new class vtkQWidgetWidget in SlicerVR (to show a Qt widget in VR that can be manipulated using a laser pointer), and I keep getting a crash when rendering the scene after adding…

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## [How to reconstruct surface from many contours?](https://discourse.vtk.org/t/how-to-reconstruct-surface-from-many-contours/1875)

<div class="topic-metadata">

**Author:** [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)\
**Replies:** 1\
**Last updated:** [October 7, 2019, 6:05pm UTC](https://discourse.vtk.org/t/how-to-reconstruct-surface-from-many-contours/1875 "2019-10-07T18:05:28Z")

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I have several contours, and I want to reconstruct a surface. The vtkVoxelContourToSurface don’t work, because it requires that each contour has a constant Z. However, I want to reconstruct a bending cylinder, in which …

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## [color volume without volumeproperty.setColor](https://discourse.vtk.org/t/color-volume-without-volumeproperty-setcolor/1877)

<div class="topic-metadata">

**Author:** [@svabhishek29](https://discourse.vtk.org/u/svabhishek29)\
**Replies:** 1\
**Last updated:** [October 7, 2019, 5:59pm UTC](https://discourse.vtk.org/t/color-volume-without-volumeproperty-setcolor/1877 "2019-10-07T17:59:14Z")

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Hi, I have a MRI scan that i have applied lut with proper windowing, when i try to volume render this colored MRI i still get grayscale volume. i have tried using volumeProperty.SetIndependentComponents(False) but then…

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## [VTK QT](https://discourse.vtk.org/t/vtk-qt/1880)

<div class="topic-metadata">

**Author:** [@bin](https://discourse.vtk.org/u/bin)\
**Replies:** 0\
**Last updated:** [October 7, 2019, 2:12pm UTC](https://discourse.vtk.org/t/vtk-qt/1880 "2019-10-07T14:12:17Z")

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I use VTK+QT to compile together. The two functions are DICOM read rebuild and camera capture image read video stream. My VTKactor is displayed in QVTKwidget, how can I make the read video stream appear in QVTKwidget? Be…

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## [What is the function to extract colormap from volume data?](https://discourse.vtk.org/t/what-is-the-function-to-extract-colormap-from-volume-data/1721)

<div class="topic-metadata">

**Author:** [@rjsgml5698](https://discourse.vtk.org/u/rjsgml5698)\
**Replies:** 6\
**Last updated:** [September 10, 2019, 10:30pm UTC](https://discourse.vtk.org/t/what-is-the-function-to-extract-colormap-from-volume-data/1721 "2019-09-10T22:30:05Z")

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Hello. I have two questions. language : python Does SetExtractionModeToLargestRegion () not apply to imagedata? only polydata? What is the function to extract colormap from volume data? Thank you

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## [Mesh From Contours](https://discourse.vtk.org/t/mesh-from-contours/896)

<div class="topic-metadata">

**Author:** [@medicalus](https://discourse.vtk.org/u/medicalus)\
**Replies:** 6\
**Last updated:** [October 7, 2019, 3:38am UTC](https://discourse.vtk.org/t/mesh-from-contours/896 "2019-10-07T03:38:57Z")

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Hi Guys, I have a question regarding the algorithm from vtk to use for creating a mesh out of contours I have. The contours are not necessarily parallel and the structure is a vessel with one/two branches. What is the g…

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## [Create a stl model from binary images with specific spacing.](https://discourse.vtk.org/t/create-a-stl-model-from-binary-images-with-specific-spacing/1868)

<div class="topic-metadata">

**Author:** [@qoqo](https://discourse.vtk.org/u/qoqo)\
**Replies:** 2\
**Last updated:** [October 5, 2019, 11:00pm UTC](https://discourse.vtk.org/t/create-a-stl-model-from-binary-images-with-specific-spacing/1868 "2019-10-05T23:00:42Z")

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Dear VTK users, I am a newbie VTK user (python). Does anyone know how to generate a stl model from 3 dimentional binary images? For example, I have a folder including 800 jpg images. Then I need to stack them into 3D mat…

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## [Why the number of Cells higher than the number of Points?](https://discourse.vtk.org/t/why-the-number-of-cells-higher-than-the-number-of-points/1854)

<div class="topic-metadata">

**Author:** [@sherinnovation](https://discourse.vtk.org/u/sherinnovation)\
**Replies:** 3\
**Last updated:** [October 5, 2019, 2:17pm UTC](https://discourse.vtk.org/t/why-the-number-of-cells-higher-than-the-number-of-points/1854 "2019-10-05T14:17:10Z")

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Hi, I have a polygonal mesh which when I load in paraview or programmaticlly load in vtk, the number of cells(23336) is found higher than the number of points(11754). This is confusing to me because as I understand the c…

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## [Find Pixel Coordinates of 3D Volume (DICOM) Before and After Multi-planar Reformatting (MPR) with vtkImageReslice](https://discourse.vtk.org/t/find-pixel-coordinates-of-3d-volume-dicom-before-and-after-multi-planar-reformatting-mpr-with-vtkimagereslice/1872)

<div class="topic-metadata">

**Author:** [@MichelleKline](https://discourse.vtk.org/u/MichelleKline)\
**Replies:** 1\
**Last updated:** [October 5, 2019, 3:08am UTC](https://discourse.vtk.org/t/find-pixel-coordinates-of-3d-volume-dicom-before-and-after-multi-planar-reformatting-mpr-with-vtkimagereslice/1872 "2019-10-05T03:08:16Z")

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Hello, I would like to compare the value of a voxel in a DICOM volume before and after reformatting (reslicing) the volume. I am stuck on this and hope someone may know how to do this. Here is what I do: Read a DICO…

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## [Install library with co-dependant modules](https://discourse.vtk.org/t/install-library-with-co-dependant-modules/1866)

<div class="topic-metadata">

**Author:** [@Charles\_Gueunet](https://discourse.vtk.org/u/Charles_Gueunet)\
**Replies:** 1\
**Last updated:** [October 4, 2019, 7:47pm UTC](https://discourse.vtk.org/t/install-library-with-co-dependant-modules/1866 "2019-10-04T19:47:11Z")

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I have a library which have a lot of vtk modules and I am updating those to the new VTK modules. Some of these modules depends on each other, which means I have encountered the race condition described in this post. Th…

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## [Does the installation of paraview automatically install VTK as well?](https://discourse.vtk.org/t/does-the-installation-of-paraview-automatically-install-vtk-as-well/1861)

<div class="topic-metadata">

**Author:** [@zzzhhh](https://discourse.vtk.org/u/zzzhhh)\
**Replies:** 2\
**Last updated:** [October 4, 2019, 7:44pm UTC](https://discourse.vtk.org/t/does-the-installation-of-paraview-automatically-install-vtk-as-well/1861 "2019-10-04T19:44:58Z")

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I heard that paraview is built around VTK, so I was wondering if the installation of paraview automatically installs VTK as well. Specifically, I hope CGAL’s cmake script can automatically detect the existence of VTK and…

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## [Scalable Text Position by Scaling its Parent (QVtkRenderWindowInteractor) size vtk python](https://discourse.vtk.org/t/scalable-text-position-by-scaling-its-parent-qvtkrenderwindowinteractor-size-vtk-python/1871)

<div class="topic-metadata">

**Author:** [@kimia.af1998](https://discourse.vtk.org/u/kimia.af1998)\
**Replies:** 0\
**Last updated:** [October 4, 2019, 7:24pm UTC](https://discourse.vtk.org/t/scalable-text-position-by-scaling-its-parent-qvtkrenderwindowinteractor-size-vtk-python/1871 "2019-10-04T19:24:25Z")

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Hi I have a render window that contains a text actor . its widget container can scale and resize by user but the text position is still fixed.(I used grid layout with pyqt5 that is resizable and contains my render wind…

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