# Latest

**URL:** https://discourse.vtk.org/latest.md?page=249

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

**Page:** 250

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## [SetOpacity on Actor2D](https://discourse.vtk.org/t/setopacity-on-actor2d/963)

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**Author:** [@Marcel\_Santos](https://discourse.vtk.org/u/Marcel_Santos)\
**Replies:** 0\
**Last updated:** [May 15, 2019, 12:13am UTC](https://discourse.vtk.org/t/setopacity-on-actor2d/963 "2019-05-15T00:13:09Z")

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Hello, I often use actor-\>GetProperty()-\>SetOpacity(opacity); with the standard vtkActor. However, I notice that whenever I try to call the same method to set the opacity of vtkActor2D’s, it turns out that there is no…

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## [Detect and extract disjoint portions of the dataset](https://discourse.vtk.org/t/detect-and-extract-disjoint-portions-of-the-dataset/959)

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**Author:** [@amit112amit](https://discourse.vtk.org/u/amit112amit)\
**Replies:** 1\
**Last updated:** [May 14, 2019, 8:20pm UTC](https://discourse.vtk.org/t/detect-and-extract-disjoint-portions-of-the-dataset/959 "2019-05-14T20:20:06Z")

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Hi. I have a 3D surface mesh (unstructured grid) with periodic boundary conditions as shown below: I clipped it using the scalar values and got four separated domains: In this pictures there are four domains in 4 …

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## [Behavior of MTime after it gets reset due to continuous changes or running a long session](https://discourse.vtk.org/t/behavior-of-mtime-after-it-gets-reset-due-to-continuous-changes-or-running-a-long-session/847)

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**Author:** [@scbiradar](https://discourse.vtk.org/u/scbiradar)\
**Replies:** 8\
**Last updated:** [May 14, 2019, 3:33pm UTC](https://discourse.vtk.org/t/behavior-of-mtime-after-it-gets-reset-due-to-continuous-changes-or-running-a-long-session/847 "2019-05-14T15:33:10Z")

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I am using a vtkCutter with a vtkPlane as the Cut function to visualize a dataset. I am running a loop where I continuously modify the cut plane’s origin/normal. Everything works fine till the Modified Time of the cut p…

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## [Unable to build vtkAcceleratorsVTKm with CUDA using VTK Release on Visual Studio 2015 / Windows 10](https://discourse.vtk.org/t/unable-to-build-vtkacceleratorsvtkm-with-cuda-using-vtk-release-on-visual-studio-2015-windows-10/133)

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**Author:** [@Shan](https://discourse.vtk.org/u/Shan)\
**Replies:** 12\
**Last updated:** [May 14, 2019, 11:52am UTC](https://discourse.vtk.org/t/unable-to-build-vtkacceleratorsvtkm-with-cuda-using-vtk-release-on-visual-studio-2015-windows-10/133 "2019-05-14T11:52:17Z")

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I am getting the following output/error in Visual Studio 2015 when trying to build the vtkAcceleratorsVTKm project generated by cmake: 90\> D:\\VTK\_build\\Accelerators\\Vtkm\>“C:\\Program Files\\NVIDIA GPU Computing To…

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## [How to disable the dragging option of vtkOrientationMarkerWidget?](https://discourse.vtk.org/t/how-to-disable-the-dragging-option-of-vtkorientationmarkerwidget/946)

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**Author:** [@Kim\_William](https://discourse.vtk.org/u/Kim_William)\
**Replies:** 2\
**Last updated:** [May 14, 2019, 5:30am UTC](https://discourse.vtk.org/t/how-to-disable-the-dragging-option-of-vtkorientationmarkerwidget/946 "2019-05-14T05:30:53Z")

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Hi all. I have a simple question about dragging option of vtkOrientationMarkerWidget. I want to disable the dragging option. (I attached the image file, it indicates the dragging box of vtkOrientationMarkerWidget.) C…

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## [Rendering a time sequence of volumes](https://discourse.vtk.org/t/rendering-a-time-sequence-of-volumes/788)

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**Author:** [@guillaumedavidphd](https://discourse.vtk.org/u/guillaumedavidphd)\
**Replies:** 8\
**Last updated:** [May 13, 2019, 2:55pm UTC](https://discourse.vtk.org/t/rendering-a-time-sequence-of-volumes/788 "2019-05-13T14:55:25Z")

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Hi All, I’m new around here, and also new to VTK so bear with me. I have a series of vti files of an object. The series describes the movement of the object. I would like to render the series as an animation. So far I’v…

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## [vtkMetaImageWriter crashes when writing MHD file to long absolute path](https://discourse.vtk.org/t/vtkmetaimagewriter-crashes-when-writing-mhd-file-to-long-absolute-path/943)

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**Author:** [@lukas](https://discourse.vtk.org/u/lukas)\
**Replies:** 1\
**Last updated:** [May 13, 2019, 6:42am UTC](https://discourse.vtk.org/t/vtkmetaimagewriter-crashes-when-writing-mhd-file-to-long-absolute-path/943 "2019-05-13T06:42:26Z")

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Hi all, I have encountered a problem with the vtkMetaImageWriter when writing mhd files with long absolute paths. When the absolute path exceeds a certain number of characters (262 in my case), the program crashes with…

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## [create tetrahedral from a set of points using vtkDelaunay3D](https://discourse.vtk.org/t/create-tetrahedral-from-a-set-of-points-using-vtkdelaunay3d/938)

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**Author:** [@Ida](https://discourse.vtk.org/u/Ida)\
**Replies:** 4\
**Last updated:** [May 12, 2019, 10:10am UTC](https://discourse.vtk.org/t/create-tetrahedral-from-a-set-of-points-using-vtkdelaunay3d/938 "2019-05-12T10:10:11Z")

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Hi, How do I create tetrahedral from a set of points using vtkDelaunay3D? This is what I have come up with so far. vtkDelaunay3D\* getDelaunayTets; // create instance of vtkDelaunay3D vtkPoints\* points; points=vtkPoin…

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## [Deprecate vtkTemporalStreamTracer and vtkPTemporalStreamTracer](https://discourse.vtk.org/t/deprecate-vtktemporalstreamtracer-and-vtkptemporalstreamtracer/936)

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**Author:** [@danlipsa](https://discourse.vtk.org/u/danlipsa)\
**Replies:** 1\
**Last updated:** [May 10, 2019, 2:47pm UTC](https://discourse.vtk.org/t/deprecate-vtktemporalstreamtracer-and-vtkptemporalstreamtracer/936 "2019-05-10T14:47:48Z")

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Hi all, We are working to deprecate vtkTemporalStreamTracer and vtkPTemporalStreamTracer. These classes don’t have tests and have been refactored a while ago into vtkParticleTracerBase and vtkPParticleTracerBase. Als…

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## [Linking error: Undefined reference to \<vtkInteractor-derived class\>::New(). All VTK libraries linked, I suppose.](https://discourse.vtk.org/t/linking-error-undefined-reference-to-vtkinteractor-derived-class-new-all-vtk-libraries-linked-i-suppose/949)

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**Author:** [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)\
**Replies:** 2\
**Last updated:** [May 10, 2019, 12:14pm UTC](https://discourse.vtk.org/t/linking-error-undefined-reference-to-vtkinteractor-derived-class-new-all-vtk-libraries-linked-i-suppose/949 "2019-05-10T12:14:19Z")

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Greetings, all, I’m trying to compile the code below: #ifndef V3DMOUSEINTERACTORSTYLE\_H #define V3DMOUSEINTERACTORSTYLE\_H #include \<vtkObjectFactory.h\> #include \<vtkInteractorStyleTrackballCamera.h\> class v3dMouseInte…

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## [Packaging with an installed version of VTK](https://discourse.vtk.org/t/packaging-with-an-installed-version-of-vtk/933)

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**Author:** [@Sunderlandkyl](https://discourse.vtk.org/u/Sunderlandkyl)\
**Replies:** 1\
**Last updated:** [May 10, 2019, 12:11pm UTC](https://discourse.vtk.org/t/packaging-with-an-installed-version-of-vtk/933 "2019-05-10T12:11:01Z")

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Previously in Plus, we built VTK and set VTK\_DIR to the binary directory. In order to reduce the command length for rc.exe (due to the large number of additional include directories), we decided to install VTK and then s…

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## [vtkImageResliceViewer - How to use](https://discourse.vtk.org/t/vtkimageresliceviewer-how-to-use/948)

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**Author:** [@Riccardo\_Ballarini](https://discourse.vtk.org/u/Riccardo_Ballarini)\
**Replies:** 0\
**Last updated:** [May 10, 2019, 9:52am UTC](https://discourse.vtk.org/t/vtkimageresliceviewer-how-to-use/948 "2019-05-10T09:52:50Z")

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Hi, I’m looking for an example on vtkImageResliceViewer, because the only example I found is for Qt. Does anyone has got and example with only VTK (and not Qt)? Thank you all.

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## [The PLY file is not working.](https://discourse.vtk.org/t/the-ply-file-is-not-working/924)

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**Author:** [@Kim\_William](https://discourse.vtk.org/u/Kim_William)\
**Replies:** 13\
**Last updated:** [May 10, 2019, 2:55am UTC](https://discourse.vtk.org/t/the-ply-file-is-not-working/924 "2019-05-10T02:55:05Z")

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Hi all. I have a question about PLY file load. I have two PLY files. (A) PLY file: It made by 3D Scanner. (B) PLY file: The sample PLY file from the link. Link: http://graphics.im.ntu.edu.tw/~robin/courses/cg04/mode…

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## [Upcasting vtkSmartPointer](https://discourse.vtk.org/t/upcasting-vtksmartpointer/935)

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**Author:** [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)\
**Replies:** 2\
**Last updated:** [May 9, 2019, 5:25pm UTC](https://discourse.vtk.org/t/upcasting-vtksmartpointer/935 "2019-05-09T17:25:00Z")

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Greetings, The (legacy) code below that used to compile: vtkSmartPointer\<vtkLookupTable\> lut = Util::getColorTable( ColorTable::RAINBOW, min, max); ... pointCloudMapper-\>SetLookupTable(lut); Now I get no known conv…

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## [Mouse not working for Fullscreen in SplitViewportHorizontal.](https://discourse.vtk.org/t/mouse-not-working-for-fullscreen-in-splitviewporthorizontal/923)

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**Author:** [@aabs08](https://discourse.vtk.org/u/aabs08)\
**Replies:** 3\
**Last updated:** [May 9, 2019, 4:44pm UTC](https://discourse.vtk.org/t/mouse-not-working-for-fullscreen-in-splitviewporthorizontal/923 "2019-05-09T16:44:33Z")

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When the render window (vtkRenderWindow()) is both SetStereoTypeToSplitViewportHorizontal() and SetFullScreen(True), I face a weird bug that I cannot use my mouse for any interaction (rotate and zoom) but can use my keyb…

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## [How to get mirrored view from vtkcamera](https://discourse.vtk.org/t/how-to-get-mirrored-view-from-vtkcamera/898)

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**Author:** [@Jay](https://discourse.vtk.org/u/Jay)\
**Replies:** 1\
**Last updated:** [May 9, 2019, 4:38am UTC](https://discourse.vtk.org/t/how-to-get-mirrored-view-from-vtkcamera/898 "2019-05-09T04:38:15Z")

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I used the VTK camera to change the position and focal length and was able to see the scene. Now I was wondering how can I get the mirror image of the scene (Horizontal flip i.e. left becomes right & right becomes left) …

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## [Display both 3D polydata and 2D "projected" images preserving the geometrical relations](https://discourse.vtk.org/t/display-both-3d-polydata-and-2d-projected-images-preserving-the-geometrical-relations/926)

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**Author:** [@sdobashi](https://discourse.vtk.org/u/sdobashi)\
**Replies:** 4\
**Last updated:** [May 8, 2019, 10:39pm UTC](https://discourse.vtk.org/t/display-both-3d-polydata-and-2d-projected-images-preserving-the-geometrical-relations/926 "2019-05-08T22:39:40Z")

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Hello everyone, I have one 3D poly-data and several related 2D images obtained by some projection from certain angles, like X-ray images. (2D images are not constructed directly from the 3D poly-data but provided from …

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## [Moving from QMake to CMake: "VTK is designed to work with OpenGL version..."](https://discourse.vtk.org/t/moving-from-qmake-to-cmake-vtk-is-designed-to-work-with-opengl-version/916)

<div class="topic-metadata">

**Author:** [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)\
**Replies:** 6\
**Last updated:** [May 8, 2019, 12:59pm UTC](https://discourse.vtk.org/t/moving-from-qmake-to-cmake-vtk-is-designed-to-work-with-opengl-version/916 "2019-05-08T12:59:36Z")

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Dear all, I’ve been avoiding this for years, but I finally decided to move a Qt project from QMake to CMake. My QMake-based build works just fine, but my CMake build leads to a “VTK is designed to work with OpenGL vers…

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## [vtkPyramid / vtkQuadraticPyramid Inconsistencies](https://discourse.vtk.org/t/vtkpyramid-vtkquadraticpyramid-inconsistencies/931)

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**Author:** [@andreas](https://discourse.vtk.org/u/andreas)\
**Replies:** 0\
**Last updated:** [May 8, 2019, 11:49am UTC](https://discourse.vtk.org/t/vtkpyramid-vtkquadraticpyramid-inconsistencies/931 "2019-05-08T11:49:53Z")

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Hi Folks, I’ve got some questions regarding the pyramidal elements in vtk: First of all: Why is the GetParametricCenter() different in both cells, although they span the same domain: linear Pyra: pcoords\[0\] = pcoor…

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## [Can't pick property after changing display setting](https://discourse.vtk.org/t/cant-pick-property-after-changing-display-setting/928)

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**Author:** [@wenyalin](https://discourse.vtk.org/u/wenyalin)\
**Replies:** 0\
**Last updated:** [May 8, 2019, 3:50am UTC](https://discourse.vtk.org/t/cant-pick-property-after-changing-display-setting/928 "2019-05-08T03:50:16Z")

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Hey guys, I’m a newbie in VTK. I got some display problem when trying to change the style of displaying image. I have a renderwindow and an observer to pick pixel when mouse hovering, the observer setup is imitated from…

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## [Error importing vtkTkRenderWindowInteractor in vtk 8.2.0](https://discourse.vtk.org/t/error-importing-vtktkrenderwindowinteractor-in-vtk-8-2-0/856)

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**Author:** [@Julie](https://discourse.vtk.org/u/Julie)\
**Replies:** 27\
**Last updated:** [May 7, 2019, 10:54pm UTC](https://discourse.vtk.org/t/error-importing-vtktkrenderwindowinteractor-in-vtk-8-2-0/856 "2019-05-07T22:54:35Z")

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Hi, everyone I am writing a simple GUI with simple inputs and vtk rendering in Python. One article about this is combing tk and vtk, namely vtkTkRenderWindowInteractor, the error and code is as below: (1) Error--------…

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## [dropping support for Qt 5.6 and below](https://discourse.vtk.org/t/dropping-support-for-qt-5-6-and-below/493)

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**Author:** [@utkarshayachit](https://discourse.vtk.org/u/utkarshayachit)\
**Replies:** 4\
**Last updated:** [May 7, 2019, 4:49pm UTC](https://discourse.vtk.org/t/dropping-support-for-qt-5-6-and-below/493 "2019-05-07T16:49:04Z")

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Qt 5.6 LTS support ends March 2019. Consequently, I think we should drop support for 5.6 in VTK too. Thoughts? Objections?

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## [Dashboard Outage Wednesday May 8th](https://discourse.vtk.org/t/dashboard-outage-wednesday-may-8th/918)

<div class="topic-metadata">

**Author:** [@RobertMaynard](https://discourse.vtk.org/u/RobertMaynard)\
**Replies:** 0\
**Last updated:** [May 6, 2019, 9:15pm UTC](https://discourse.vtk.org/t/dashboard-outage-wednesday-may-8th/918 "2019-05-06T21:15:12Z")

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Hi, We are installing another KVM at Kitware, and a collection of the VTK Dashboards will experience an outage Wednesday morning as we transition them to this hardware. I expect the dashboards to be down between 7:30am …

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## [Weird version in build output](https://discourse.vtk.org/t/weird-version-in-build-output/911)

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**Author:** [@Gilthalas](https://discourse.vtk.org/u/Gilthalas)\
**Replies:** 3\
**Last updated:** [May 6, 2019, 7:05pm UTC](https://discourse.vtk.org/t/weird-version-in-build-output/911 "2019-05-06T19:05:17Z")

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I’m working on building VTK 8.2, and for some reason, the final files that get built have a version number of 8.90, which I don’t quite understand. Any idea on what may cause this?

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## [Artifacts when using Gouraud or Phong interpolation](https://discourse.vtk.org/t/artifacts-when-using-gouraud-or-phong-interpolation/913)

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**Author:** [@Gilthalas](https://discourse.vtk.org/u/Gilthalas)\
**Replies:** 2\
**Last updated:** [May 6, 2019, 6:08pm UTC](https://discourse.vtk.org/t/artifacts-when-using-gouraud-or-phong-interpolation/913 "2019-05-06T18:08:01Z")

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I am getting odd artifacts when looking at a 3D OBJ with vtk8.2 (even though we did not see this in our tool using vtk6.3). When I choose flat shading it looks fine (but we really want the option to show both as before).…

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## [How to apply vtkWeb in docker container](https://discourse.vtk.org/t/how-to-apply-vtkweb-in-docker-container/838)

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**Author:** [@Thomas](https://discourse.vtk.org/u/Thomas)\
**Replies:** 5\
**Last updated:** [May 6, 2019, 3:43pm UTC](https://discourse.vtk.org/t/how-to-apply-vtkweb-in-docker-container/838 "2019-05-06T15:43:58Z")

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How can I implement my VTK script in a Docker container and connect it via vtkWeb with a client who wants to interact with the RenderWindow? I’m using the image brainlife/pythonvtk (https://hub.docker.com/r/brainlife/py…

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## [Issue with VTK in ROS Workspace](https://discourse.vtk.org/t/issue-with-vtk-in-ros-workspace/908)

<div class="topic-metadata">

**Author:** [@mia](https://discourse.vtk.org/u/mia)\
**Replies:** 0\
**Last updated:** [May 6, 2019, 8:50am UTC](https://discourse.vtk.org/t/issue-with-vtk-in-ros-workspace/908 "2019-05-06T08:50:44Z")

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Hi everyone, I am new to Qt and ROS. I am working on Qt Creator 4.8.0 (QT with ROS plugin). I have created a catkin workspace in Qt and a mainwindow was created. And I am trying to add QVTKWidget to the mainwindow …

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## [Realtime point cloud visualization](https://discourse.vtk.org/t/realtime-point-cloud-visualization/905)

<div class="topic-metadata">

**Author:** [@ljc19800331](https://discourse.vtk.org/u/ljc19800331)\
**Replies:** 1\
**Last updated:** [May 6, 2019, 6:00am UTC](https://discourse.vtk.org/t/realtime-point-cloud-visualization/905 "2019-05-06T06:00:01Z")

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I tried a realtime point cloud visualization code with vtk 8.1.2. This is the reference link: I tried the code with vtk 8.1.2 and vtk 6.3.0 and it only works for vtk 6.3.0. I checked multiple times and could not figu…

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## [vtkCellLocator with vtkLagrangeHexehdron](https://discourse.vtk.org/t/vtkcelllocator-with-vtklagrangehexehdron/900)

<div class="topic-metadata">

**Author:** [@ataber](https://discourse.vtk.org/u/ataber)\
**Replies:** 1\
**Last updated:** [May 6, 2019, 5:22am UTC](https://discourse.vtk.org/t/vtkcelllocator-with-vtklagrangehexehdron/900 "2019-05-06T05:22:28Z")

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It appears that when I attempt to use vtkCellLocator with cells of type vtkLagrangeHexehdron, the cell locator sets the closest point out parameter to be the same as the original query point. It also does not show an err…

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## [VTK for imaging application](https://discourse.vtk.org/t/vtk-for-imaging-application/906)

<div class="topic-metadata">

**Author:** [@Fibblefabble](https://discourse.vtk.org/u/Fibblefabble)\
**Replies:** 1\
**Last updated:** [May 6, 2019, 5:00am UTC](https://discourse.vtk.org/t/vtk-for-imaging-application/906 "2019-05-06T05:00:09Z")

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Hi all, I was hoping someone could tell me if this is the correct direction to go in for visualizing my data in VTK. I’m pretty familiar with different types of data visualization techniques, but only recently started pl…

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