# Development

**URL:** https://discourse.vtk.org/c/development/7.md?page=45

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

**Page:** 46

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## [Plot disappearing](https://discourse.vtk.org/t/plot-disappearing/2676)

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**Author:** [@snip777](https://discourse.vtk.org/u/snip777)\
**Replies:** 0\
**Last updated:** [February 21, 2020, 8:52pm UTC](https://discourse.vtk.org/t/plot-disappearing/2676 "2020-02-21T20:52:33Z")

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I wrote custom plot which derives from vtkPlot and added it to vtkChartXY. When i zoomin at some point the plot just disappears. I looked at vtk sources and found that the problem originates in function vtkChart::Calcu…

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## [Get a vector at specific voxel coordinates](https://discourse.vtk.org/t/get-a-vector-at-specific-voxel-coordinates/2664)

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**Author:** [@Nina](https://discourse.vtk.org/u/Nina)\
**Replies:** 0\
**Last updated:** [February 20, 2020, 6:20pm UTC](https://discourse.vtk.org/t/get-a-vector-at-specific-voxel-coordinates/2664 "2020-02-20T18:20:20Z")

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Hi, I have applied a 3d sobel filter on vtkImageData like this: vtkSmartPointer\<vtkImageSobel3D\> sobelFilter = vtkSmartPointer\<vtkImageSobel3D\>::New(); sobelFilter-\>SetInputData(image); sobelFilter-\>Update(); My quest…

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## [Glyphs errors when moving a QVTKOpenGLWidget to an another layout](https://discourse.vtk.org/t/glyphs-errors-when-moving-a-qvtkopenglwidget-to-an-another-layout/2581)

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**Author:** [@embeddedmz](https://discourse.vtk.org/u/embeddedmz)\
**Replies:** 7\
**Last updated:** [February 14, 2020, 2:42pm UTC](https://discourse.vtk.org/t/glyphs-errors-when-moving-a-qvtkopenglwidget-to-an-another-layout/2581 "2020-02-14T14:42:11Z")

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Hi, I’m getting these errors when I’m moving the QVTKOpenGLWidget, in which I’m using a vtkGlyph3DMapper, to an another layout of another widget in order to show it full screen : ERROR: In /home/febus-g1/rpmbuild/BUIL…

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## [How to check disconnected vertices in a triangular mesh](https://discourse.vtk.org/t/how-to-check-disconnected-vertices-in-a-triangular-mesh/2593)

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**Author:** [@srbn.ghosh99](https://discourse.vtk.org/u/srbn.ghosh99)\
**Replies:** 3\
**Last updated:** [February 13, 2020, 7:31pm UTC](https://discourse.vtk.org/t/how-to-check-disconnected-vertices-in-a-triangular-mesh/2593 "2020-02-13T19:31:00Z")

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Hello Everyone, I have a triangular mesh that has 1038458 polygons, 517817 points, 1557687 edges. During the simplification process, I am getting the message that there are 1092 disconnected vertices, 516725 connected v…

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## [VTK 9 release coming](https://discourse.vtk.org/t/vtk-9-release-coming/1859)

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**Author:** [@Dave\_DeMarle](https://discourse.vtk.org/u/Dave_DeMarle)\
**Replies:** 13\
**Last updated:** [February 13, 2020, 7:26am UTC](https://discourse.vtk.org/t/vtk-9-release-coming/1859 "2020-02-13T07:26:32Z")

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Hey Folks, I would like to start up the release process for VTK 9.0. @ben.boeckel and I both think that we need to tie up these loose ends before making the branch. write the VTK 9 transition guide (documenting things…

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## [Looking for answer to this vtkImageReslice question](https://discourse.vtk.org/t/looking-for-answer-to-this-vtkimagereslice-question/2588)

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**Author:** [@richardander](https://discourse.vtk.org/u/richardander)\
**Replies:** 1\
**Last updated:** [February 12, 2020, 8:46am UTC](https://discourse.vtk.org/t/looking-for-answer-to-this-vtkimagereslice-question/2588 "2020-02-12T08:46:25Z")

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Can any one help with this question? Thank you!

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## [example: smartvolumemapper](https://discourse.vtk.org/t/example-smartvolumemapper/2555)

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**Author:** [@Tracy\_Nk](https://discourse.vtk.org/u/Tracy_Nk)\
**Replies:** 4\
**Last updated:** [February 10, 2020, 4:09pm UTC](https://discourse.vtk.org/t/example-smartvolumemapper/2555 "2020-02-10T16:09:12Z")

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Hello, I’m doing this example: https://lorensen.github.io/VTKExamples/site/Cxx/VolumeRendering/SmartVolumeMapper/ however while trying to configure it on CMAKE this is the error I received: how can I resolve this? T…

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## [Calling SetSize(X, Y) on a vtkRenderWindow will sometime size to something else than X\*Y](https://discourse.vtk.org/t/calling-setsize-x-y-on-a-vtkrenderwindow-will-sometime-size-to-something-else-than-x-y/2556)

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**Author:** [@jjackso2](https://discourse.vtk.org/u/jjackso2)\
**Replies:** 0\
**Last updated:** [February 6, 2020, 8:16pm UTC](https://discourse.vtk.org/t/calling-setsize-x-y-on-a-vtkrenderwindow-will-sometime-size-to-something-else-than-x-y/2556 "2020-02-06T20:16:21Z")

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Title. This will result in GetSize() returning values different from X and Y in SetSize(X, Y) called prior. Most often than not, if you try calling SetSize() multiple times with the same values it will end up working …

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## [Camera Clipping with 2 Renderers](https://discourse.vtk.org/t/camera-clipping-with-2-renderers/2483)

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**Author:** [@ChristopherWaters](https://discourse.vtk.org/u/ChristopherWaters)\
**Replies:** 10\
**Last updated:** [January 31, 2020, 2:05am UTC](https://discourse.vtk.org/t/camera-clipping-with-2-renderers/2483 "2020-01-31T02:05:15Z")

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Current Setup: I have 2 renderers, gridRenderer and geoRenderer, within 2 layers of a render window: gridRenderer-\>SetLayer(0); geoRenderer-\>SetLayer(1); RenderWindow()-\>SetNumberOfLayers(2); RenderWindow()-\>AddRend…

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## [Rendering using vtkRenderWindowInteractor](https://discourse.vtk.org/t/rendering-using-vtkrenderwindowinteractor/2522)

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**Author:** [@Indushekhar\_Singh](https://discourse.vtk.org/u/Indushekhar_Singh)\
**Replies:** 0\
**Last updated:** [January 30, 2020, 5:44pm UTC](https://discourse.vtk.org/t/rendering-using-vtkrenderwindowinteractor/2522 "2020-01-30T17:44:27Z")

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Hi I am using Activiz ( VTK for .NET ) version 5.8. My application is to render a real-time 3D Point cloud. I want to do the whole rendering using vtkRenderWindowInteractor. But currently, I can only use it at the start…

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## [How to find MR from commit](https://discourse.vtk.org/t/how-to-find-mr-from-commit/2511)

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**Author:** [@toddy](https://discourse.vtk.org/u/toddy)\
**Replies:** 14\
**Last updated:** [January 30, 2020, 1:33am UTC](https://discourse.vtk.org/t/how-to-find-mr-from-commit/2511 "2020-01-30T01:33:46Z")

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Hi. Is it possible to find the gitlab merge request associated with a git commit (SHA number) in master? Or do the commits need to be tagged somehow?

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## [Near clipping plane problem when in parallel projection](https://discourse.vtk.org/t/near-clipping-plane-problem-when-in-parallel-projection/2515)

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**Author:** [@jjackso2](https://discourse.vtk.org/u/jjackso2)\
**Replies:** 0\
**Last updated:** [January 29, 2020, 10:37pm UTC](https://discourse.vtk.org/t/near-clipping-plane-problem-when-in-parallel-projection/2515 "2020-01-29T22:37:00Z")

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There is a near clipping plane problem when in parallel projection. Objects close will get clipped before they are behind the camera. This is exactly bug reported in the old tracker. https://vtk.org/Bug/view.php?id=78…

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## [LINK : fatal error LNK1102: out of memory \[AcceleratorsVTKm.vcxproj\]](https://discourse.vtk.org/t/link-fatal-error-lnk1102-out-of-memory-acceleratorsvtkm-vcxproj/2501)

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**Author:** [@sharon](https://discourse.vtk.org/u/sharon)\
**Replies:** 3\
**Last updated:** [January 29, 2020, 3:40am UTC](https://discourse.vtk.org/t/link-fatal-error-lnk1102-out-of-memory-acceleratorsvtkm-vcxproj/2501 "2020-01-29T03:40:34Z")

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Dear Experts: After i enable “VTK\_SMP\_IMPLEMENTATION\_TYPE=TBB”, in debug build mode, there will have below error: LINK : fatal error LNK1102: out of memory \[VTK\\Accelerators\\Vtkm\\AcceleratorsVTKm.vcxproj\] My Questions…

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## [Disabling Camera Roll](https://discourse.vtk.org/t/disabling-camera-roll/2506)

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**Author:** [@ChristopherWaters](https://discourse.vtk.org/u/ChristopherWaters)\
**Replies:** 0\
**Last updated:** [January 28, 2020, 8:48am UTC](https://discourse.vtk.org/t/disabling-camera-roll/2506 "2020-01-28T08:48:39Z")

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Current Situation: I am using an implmentation of vtkInteractorStyleTrackballCamera for my interator/camera. I want the camera to only adjust it’s Yaw/Pitch when rotated by the user Question: What would be the best …

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## [OpenGL error occurs in Ubuntu with Qt and VTK](https://discourse.vtk.org/t/opengl-error-occurs-in-ubuntu-with-qt-and-vtk/2465)

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**Author:** [@Pooja](https://discourse.vtk.org/u/Pooja)\
**Replies:** 8\
**Last updated:** [January 28, 2020, 5:23am UTC](https://discourse.vtk.org/t/opengl-error-occurs-in-ubuntu-with-qt-and-vtk/2465 "2020-01-28T05:23:57Z")

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Hello, I tried loading of DICOM data example from in QT application using VTK in Ubuntu system. I have VTK 8.2.0 and Qt 5.13.1 installed on Ubuntu system. Compiling and building of this example was successful. But…

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## [How to use the raycasting on 3d object to get 2D image?](https://discourse.vtk.org/t/how-to-use-the-raycasting-on-3d-object-to-get-2d-image/2503)

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**Author:** [@Fedia](https://discourse.vtk.org/u/Fedia)\
**Replies:** 1\
**Last updated:** [January 27, 2020, 3:36pm UTC](https://discourse.vtk.org/t/how-to-use-the-raycasting-on-3d-object-to-get-2d-image/2503 "2020-01-27T15:36:05Z")

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Gd morning plz any one can help me to use the raycasting on 3d object to get 2D image? thnx

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## [Reading and writing side and node sets](https://discourse.vtk.org/t/reading-and-writing-side-and-node-sets/2498)

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**Author:** [@dcthomp](https://discourse.vtk.org/u/dcthomp)\
**Replies:** 5\
**Last updated:** [January 25, 2020, 10:59pm UTC](https://discourse.vtk.org/t/reading-and-writing-side-and-node-sets/2498 "2020-01-25T22:59:09Z")

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Hi all, but especially @TJ\_Corona, @utkarshayachit, @cory.quammen, and @wascott, One thing that has come up as @Andrew works on cmb/aeva support for MED files is the notion of side and node sets, which are also present…

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## [Extract a set of contours from binarylabelMaps](https://discourse.vtk.org/t/extract-a-set-of-contours-from-binarylabelmaps/2495)

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**Author:** [@Nina](https://discourse.vtk.org/u/Nina)\
**Replies:** 6\
**Last updated:** [January 25, 2020, 6:14pm UTC](https://discourse.vtk.org/t/extract-a-set-of-contours-from-binarylabelmaps/2495 "2020-01-25T18:14:23Z")

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Hi; In fact I want to develop a new method which reconstruct a 3D surface Model from a set of contours using implicit models. For the entry I have Brain MRI images stored in DICOM format. When using segment editor to …

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## [CT volume image orientation correction](https://discourse.vtk.org/t/ct-volume-image-orientation-correction/2490)

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**Author:** [@srbn.ghosh99](https://discourse.vtk.org/u/srbn.ghosh99)\
**Replies:** 3\
**Last updated:** [January 25, 2020, 12:45pm UTC](https://discourse.vtk.org/t/ct-volume-image-orientation-correction/2490 "2020-01-25T12:45:39Z")

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Hi, I have a large set of ct images of heart. The ct volumes created from the image set need to be processed. But before processing, I need to check the orientation of each volume to see the long axis of the heart point…

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## [How to create the vtk.exe](https://discourse.vtk.org/t/how-to-create-the-vtk-exe/2482)

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**Author:** [@Johnny](https://discourse.vtk.org/u/Johnny)\
**Replies:** 11\
**Last updated:** [January 24, 2020, 6:25pm UTC](https://discourse.vtk.org/t/how-to-create-the-vtk-exe/2482 "2020-01-24T18:25:31Z")

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How to create the vtk.exe, I just show the .tcl file, there is no any tips to show how to create the vtk.exe?

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## [Setting camera direction of projection (position) to have slices like in 3d slicer](https://discourse.vtk.org/t/setting-camera-direction-of-projection-position-to-have-slices-like-in-3d-slicer/2466)

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**Author:** [@Andrzej\_Marciniak](https://discourse.vtk.org/u/Andrzej_Marciniak)\
**Replies:** 0\
**Last updated:** [January 20, 2020, 6:16pm UTC](https://discourse.vtk.org/t/setting-camera-direction-of-projection-position-to-have-slices-like-in-3d-slicer/2466 "2020-01-20T18:16:27Z")

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Hi, I am writing MRI browser and I am trying to set camera projection perpendicular to IJK planes in vtk-js (camera in parallel mode). I am using only vtkImageData direction matrix to calculate slicing modes and camera…

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## [Transparency in vtkPolyData (actor, RGBA) results in invisible renderings in Qt app (VTK 8.1.2)](https://discourse.vtk.org/t/transparency-in-vtkpolydata-actor-rgba-results-in-invisible-renderings-in-qt-app-vtk-8-1-2/2424)

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**Author:** [@Sophonet](https://discourse.vtk.org/u/Sophonet)\
**Replies:** 4\
**Last updated:** [January 20, 2020, 9:48am UTC](https://discourse.vtk.org/t/transparency-in-vtkpolydata-actor-rgba-results-in-invisible-renderings-in-qt-app-vtk-8-1-2/2424 "2020-01-20T09:48:27Z")

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Hi VTK team, using VTK 8.1.2 and Qt 5.14 (or earlier versions?), rendering semi-transparent meshes seems to be an issue… When adding an RGBA cell array with transparency to our PolyData object or (alternatively) sett…

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## [About AdjustRange of volume rendering](https://discourse.vtk.org/t/about-adjustrange-of-volume-rendering/2453)

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**Author:** [@yuhuimoon](https://discourse.vtk.org/u/yuhuimoon)\
**Replies:** 0\
**Last updated:** [January 19, 2020, 8:45am UTC](https://discourse.vtk.org/t/about-adjustrange-of-volume-rendering/2453 "2020-01-19T08:45:00Z")

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I’m using vtkPiecewiseFunction to set opacity function of volume rendering. I can get correct rendering effect after using “AddPoint()”. Then I use “AdjustRange()” in line 109 for testing. But the effect of rendering on …

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## [vtk-commit list broken?](https://discourse.vtk.org/t/vtk-commit-list-broken/2433)

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**Author:** [@seanm](https://discourse.vtk.org/u/seanm)\
**Replies:** 7\
**Last updated:** [January 17, 2020, 2:46am UTC](https://discourse.vtk.org/t/vtk-commit-list-broken/2433 "2020-01-17T02:46:44Z")

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Hi all, Is it me or did messages to the vtk-commit list stop? I filter those mails and don’t always check that folder, but it seems there have been none for a few weeks: https://public.kitware.com/mailman/private/vtk-…

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## [Recent VTK HDF5 changes regressed library file names...](https://discourse.vtk.org/t/recent-vtk-hdf5-changes-regressed-library-file-names/2425)

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**Author:** [@seanm](https://discourse.vtk.org/u/seanm)\
**Replies:** 1\
**Last updated:** [January 15, 2020, 2:23pm UTC](https://discourse.vtk.org/t/recent-vtk-hdf5-changes-regressed-library-file-names/2425 "2020-01-15T14:23:29Z")

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Ben, I see from git log you made some recent updates to HDF5 in VTK… Do you think those changes could have regressed the library file naming when installing VTK? Previously (to what change I’m not exactly sure) the fi…

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## [Visualize Very large number of Lines, Points/Spheres with High Performance](https://discourse.vtk.org/t/visualize-very-large-number-of-lines-points-spheres-with-high-performance/2353)

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**Author:** [@sharon](https://discourse.vtk.org/u/sharon)\
**Replies:** 4\
**Last updated:** [January 12, 2020, 2:55am UTC](https://discourse.vtk.org/t/visualize-very-large-number-of-lines-points-spheres-with-high-performance/2353 "2020-01-12T02:55:44Z")

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Dear Experts, In my situation, i need visualize very large number of Lines, Points/Spheres, with high performance, Do you have any suggestions? My current implementation is put group of lines into polyData, then put p…

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## [Python 3.8.1 deprecation warning](https://discourse.vtk.org/t/python-3-8-1-deprecation-warning/2394)

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**Author:** [@amaclean](https://discourse.vtk.org/u/amaclean)\
**Replies:** 5\
**Last updated:** [January 9, 2020, 9:26pm UTC](https://discourse.vtk.org/t/python-3-8-1-deprecation-warning/2394 "2020-01-09T21:26:03Z")

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If you look at the following code, there is a deprecation warning for: colors.SetColor("BkgColor", \[0.3, 0.6, 0.3, 1.0\]) As you can see from the code, I tried several alternatives including vtk.vtkColor4ub and vtk.vtkC…

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## [Selectively disable and enable default mouse interactions in vtk](https://discourse.vtk.org/t/selectively-disable-and-enable-default-mouse-interactions-in-vtk/2338)

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**Author:** [@Sathiya\_Moorthy](https://discourse.vtk.org/u/Sathiya_Moorthy)\
**Replies:** 2\
**Last updated:** [January 9, 2020, 5:42am UTC](https://discourse.vtk.org/t/selectively-disable-and-enable-default-mouse-interactions-in-vtk/2338 "2020-01-09T05:42:44Z")

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hi all, i want to selectively disable and enable default mouse interactions in vtk. does anyone know how to selectively disable/enable the interactions using vtkInteractorStyle or any of its subclasses.

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## [Problems with multi-touch gestures with current sources](https://discourse.vtk.org/t/problems-with-multi-touch-gestures-with-current-sources/2373)

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**Author:** [@nenad-vujicic](https://discourse.vtk.org/u/nenad-vujicic)\
**Replies:** 7\
**Last updated:** [January 8, 2020, 8:23pm UTC](https://discourse.vtk.org/t/problems-with-multi-touch-gestures-with-current-sources/2373 "2020-01-08T20:23:46Z")

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Hello everyone, I built the latest VTK sources from repository (VTK master, VS2017, x64, Qt 5.9.1, Windows 10 Pro), built Examples/GUI/Qt/TouchGestureViewer example and tried it on several machines. I got same problems …

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## [How vtkMultiBlockDataSet is rendered in vtk](https://discourse.vtk.org/t/how-vtkmultiblockdataset-is-rendered-in-vtk/2352)

<div class="topic-metadata">

**Author:** [@sharon](https://discourse.vtk.org/u/sharon)\
**Replies:** 3\
**Last updated:** [January 7, 2020, 3:02am UTC](https://discourse.vtk.org/t/how-vtkmultiblockdataset-is-rendered-in-vtk/2352 "2020-01-07T03:02:35Z")

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Dear Experts, i put several vtkPolyData into vtkMultiBlockDataSet, i am wondering how vtkMultiBlockDataSet is rendered in VTK if my polyData only contain Lines? It use VBO technique, one VBO for each vtkMultiBlockDataS…

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