# Latest

**URL:** https://discourse.vtk.org/latest.md?page=178

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

**Page:** 179

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## [vtkImageResliceMapper and an image transform](https://discourse.vtk.org/t/vtkimagereslicemapper-and-an-image-transform/5575)

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**Author:** [@aborsic](https://discourse.vtk.org/u/aborsic)\
**Replies:** 5\
**Last updated:** [April 23, 2021, 6:49pm UTC](https://discourse.vtk.org/t/vtkimagereslicemapper-and-an-image-transform/5575 "2021-04-23T18:49:49Z")

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Hi All, I have a question: I need to reslice a DICOM volume, and I have been using successfully the vtkImageResliceMapper class to do so. I am looking now to apply a linear transform to the image volume and then to sli…

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## [Issue with vtkMoleculeMapper and VTK.js](https://discourse.vtk.org/t/issue-with-vtkmoleculemapper-and-vtk-js/5238)

<div class="topic-metadata">

**Author:** [@LunarLanding](https://discourse.vtk.org/u/LunarLanding)\
**Replies:** 6\
**Last updated:** [April 23, 2021, 12:46pm UTC](https://discourse.vtk.org/t/issue-with-vtkmoleculemapper-and-vtk-js/5238 "2021-04-23T12:46:36Z")

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Hi, I’m trying to use vtkMoleculeMapper but I get a blank canvas and a javascript error (Jupyter Lab, pyvista & Panel ). Can anyone reproduce this? Most likely I made a mistake setting up the pipeline; I would be gratef…

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## [Hide selected cells with internal edges](https://discourse.vtk.org/t/hide-selected-cells-with-internal-edges/5623)

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**Author:** [@Carle](https://discourse.vtk.org/u/Carle)\
**Replies:** 0\
**Last updated:** [April 23, 2021, 4:52am UTC](https://discourse.vtk.org/t/hide-selected-cells-with-internal-edges/5623 "2021-04-23T04:52:34Z")

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Dear all, I modified the alpha to zero to hide the selected cells, but the internal edges are still visible when EdgeVisibilityOn is set, so who knows how to use modifying the rgba of cells to hide them and relative edg…

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## [CDash nightly alerts](https://discourse.vtk.org/t/cdash-nightly-alerts/5608)

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**Author:** [@toddy](https://discourse.vtk.org/u/toddy)\
**Replies:** 4\
**Last updated:** [April 23, 2021, 1:54am UTC](https://discourse.vtk.org/t/cdash-nightly-alerts/5608 "2021-04-23T01:54:55Z")

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Why have I recently started receiving emails from https://open.cdash.org/index.php?project=VTK&date=2021-04-22

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## [Tell me (if you can) why I shouldn't worry about the dashboards](https://discourse.vtk.org/t/tell-me-if-you-can-why-i-shouldnt-worry-about-the-dashboards/5610)

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**Author:** [@will.schroeder](https://discourse.vtk.org/u/will.schroeder)\
**Replies:** 9\
**Last updated:** [April 22, 2021, 8:30pm UTC](https://discourse.vtk.org/t/tell-me-if-you-can-why-i-shouldnt-worry-about-the-dashboards/5610 "2021-04-22T20:30:23Z")

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The VTK dashboards are scary. I know a lot is going on, but the current state worries me. Should we go into rapid response mode and fix this ? I see several sloppy warnings/errors that have been around for a while, at a …

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## [Inaccurate principal curvature near peaks](https://discourse.vtk.org/t/inaccurate-principal-curvature-near-peaks/5603)

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**Author:** [@cbhushan](https://discourse.vtk.org/u/cbhushan)\
**Replies:** 20\
**Last updated:** [April 21, 2021, 8:04pm UTC](https://discourse.vtk.org/t/inaccurate-principal-curvature-near-peaks/5603 "2021-04-21T20:04:56Z")

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I have been noticing some inaccurate principal curvature estimates near peaks of some of manifolds I was working with. Example included below. Areas with issue are pointed by arrows. These inaccuracies are affecting calc…

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## [cmake find\_package (VTK)](https://discourse.vtk.org/t/cmake-find-package-vtk/663)

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**Author:** [@tirons](https://discourse.vtk.org/u/tirons)\
**Replies:** 12\
**Last updated:** [April 21, 2021, 6:05pm UTC](https://discourse.vtk.org/t/cmake-find-package-vtk/663 "2021-04-21T18:05:39Z")

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Hi, I’m not sure if this is a CMake or a VTK question…apologies if this is the wrong place, but I think the behaviour I’m seeing stems from VTK’s FindVTK.cmake file. My C++ project has an optional VTK dependency, and co…

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## [Using vtkOBBTree::ComputeOBB](https://discourse.vtk.org/t/using-vtkobbtree-computeobb/5558)

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**Author:** [@spyridon97](https://discourse.vtk.org/u/spyridon97)\
**Replies:** 2\
**Last updated:** [April 21, 2021, 3:40pm UTC](https://discourse.vtk.org/t/using-vtkobbtree-computeobb/5558 "2021-04-21T15:40:38Z")

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Hello everyone, I have a point set, and I want to calculate its minimum bounding box. I need it so I can create an oriented image which I will populate afterward. For the image, I use the ITK library. So far this is my…

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## [VTK + Java + MacOS, awt error](https://discourse.vtk.org/t/vtk-java-macos-awt-error/5586)

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**Author:** [@thegbiv](https://discourse.vtk.org/u/thegbiv)\
**Replies:** 2\
**Last updated:** [April 21, 2021, 3:23pm UTC](https://discourse.vtk.org/t/vtk-java-macos-awt-error/5586 "2021-04-21T15:23:34Z")

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Hello again. In my quest to “get back into VTK shape” I’ve been trying to build/run VTK in various configurations to learn what’s changed since I’ve last used the API. One issue that I’ve run into, is that I get some st…

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## [What is VTK's minimum C++ standard?](https://discourse.vtk.org/t/what-is-vtks-minimum-c-standard/5601)

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**Author:** [@Dave\_DeMarle](https://discourse.vtk.org/u/Dave_DeMarle)\
**Replies:** 2\
**Last updated:** [April 21, 2021, 2:17pm UTC](https://discourse.vtk.org/t/what-is-vtks-minimum-c-standard/5601 "2021-04-21T14:17:38Z")

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Hey folks! What is VTK’s minimum supported C++ version these days? Is it c++14 yet or still c++11. thanks

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## [Legacy VTK: associating multiple unknowns with each point](https://discourse.vtk.org/t/legacy-vtk-associating-multiple-unknowns-with-each-point/5599)

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**Author:** [@mturner](https://discourse.vtk.org/u/mturner)\
**Replies:** 0\
**Last updated:** [April 21, 2021, 10:25am UTC](https://discourse.vtk.org/t/legacy-vtk-associating-multiple-unknowns-with-each-point/5599 "2021-04-21T10:25:14Z")

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Hi, I might have missed something obvious in the documentation, but it is not clear to me how I can associate multiple (say, up to 20) scalars with each point in a legacy VTK STRUCTURED\_POINTS representation. Currently …

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## [VTK9 blank rendering window](https://discourse.vtk.org/t/vtk9-blank-rendering-window/5588)

<div class="topic-metadata">

**Author:** [@marcomusy](https://discourse.vtk.org/u/marcomusy)\
**Replies:** 2\
**Last updated:** [April 21, 2021, 10:12am UTC](https://discourse.vtk.org/t/vtk9-blank-rendering-window/5588 "2021-04-21T10:12:20Z")

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I finally found out that If I set in my nvidia-settings “Override Application Settings” then I get a completely blank rendering window: my system: vtk version : 9.0.1 python version : 3.8.5 (default, Sep …

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## [Reading voxels from Structured Points](https://discourse.vtk.org/t/reading-voxels-from-structured-points/5591)

<div class="topic-metadata">

**Author:** [@ABWassim](https://discourse.vtk.org/u/ABWassim)\
**Replies:** 3\
**Last updated:** [April 21, 2021, 9:12am UTC](https://discourse.vtk.org/t/reading-voxels-from-structured-points/5591 "2021-04-21T09:12:52Z")

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Hello everyone, I’ve been using Binvox which is a tool that voxelizes 3D models and outputs the result in a Binary Structured Points VTK file. I wanted to some treatments on the voxels, so I used the vtkStructuredPoints…

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## [CellData with a data size different for each CellType.](https://discourse.vtk.org/t/celldata-with-a-data-size-different-for-each-celltype/5593)

<div class="topic-metadata">

**Author:** [@Florian\_Maurin](https://discourse.vtk.org/u/Florian_Maurin)\
**Replies:** 1\
**Last updated:** [April 21, 2021, 3:45am UTC](https://discourse.vtk.org/t/celldata-with-a-data-size-different-for-each-celltype/5593 "2021-04-21T03:45:57Z")

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In the example below, the cell data size is the same for each cell. \<CellData HigherOrderDegrees="HigherOrderDegrees"\> \<DataArray type="Float64" Name="HigherOrderDegrees" NumberOfComponents="3" format="ascii" R…

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## [Win CE](https://discourse.vtk.org/t/win-ce/5596)

<div class="topic-metadata">

**Author:** [@toddy](https://discourse.vtk.org/u/toddy)\
**Replies:** 1\
**Last updated:** [April 21, 2021, 3:35am UTC](https://discourse.vtk.org/t/win-ce/5596 "2021-04-21T03:35:44Z")

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I see a few $ifdef \_WIN32\_WCE in the source code. Does VTK still support Win CE?

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## [VTK.js - electron](https://discourse.vtk.org/t/vtk-js-electron/5568)

<div class="topic-metadata">

**Author:** [@hiiragii](https://discourse.vtk.org/u/hiiragii)\
**Replies:** 2\
**Last updated:** [April 20, 2021, 8:02pm UTC](https://discourse.vtk.org/t/vtk-js-electron/5568 "2021-04-20T20:02:12Z")

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Hello everyone, Newbie here so go easy on me :grin: I’m trying to run the planesource (https://kitware.github.io/vtk-js/examples/PlaneSource.html) example in an electron app. After 2 days of trying out different boiler…

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## [collision between two tubes](https://discourse.vtk.org/t/collision-between-two-tubes/5594)

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**Author:** [@Jaafar\_Nasrabadi](https://discourse.vtk.org/u/Jaafar_Nasrabadi)\
**Replies:** 5\
**Last updated:** [April 20, 2021, 7:13pm UTC](https://discourse.vtk.org/t/collision-between-two-tubes/5594 "2021-04-20T19:13:09Z")

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Hi everyone, I try to use vtkCollisionDetectionFilter to detect collision between two tubes that created with vtkTubeFilter, but vtkCollisionDetectionFilter can not detect it. when i write and read one tube as STL file…

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## [About window width and window level and display?](https://discourse.vtk.org/t/about-window-width-and-window-level-and-display/5581)

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**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 3\
**Last updated:** [April 20, 2021, 2:02pm UTC](https://discourse.vtk.org/t/about-window-width-and-window-level-and-display/5581 "2021-04-20T14:02:01Z")

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How to get the window width and window level of DICOM file, and set VR data to display only bones according to the window width and window level.

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## [Visual Studio 2019 Debug the problem](https://discourse.vtk.org/t/visual-studio-2019-debug-the-problem/5566)

<div class="topic-metadata">

**Author:** [@Jame](https://discourse.vtk.org/u/Jame)\
**Replies:** 2\
**Last updated:** [April 19, 2021, 10:35pm UTC](https://discourse.vtk.org/t/visual-studio-2019-debug-the-problem/5566 "2021-04-19T22:35:00Z")

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Pop-up window:cannot start program“D:\\VTK\\bin\\x64\\Debug\\ALL-BUILD”.Access denied.

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## [Difference between vtkViewProxy and vtkOpenGLRenderWindow](https://discourse.vtk.org/t/difference-between-vtkviewproxy-and-vtkopenglrenderwindow/5585)

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**Author:** [@joaomlap](https://discourse.vtk.org/u/joaomlap)\
**Replies:** 2\
**Last updated:** [April 19, 2021, 8:56pm UTC](https://discourse.vtk.org/t/difference-between-vtkviewproxy-and-vtkopenglrenderwindow/5585 "2021-04-19T20:56:53Z")

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Hi I have been following the tutorial ImageStream for VTK.js and I couldn’t get it to work because I got some errors with the renderWindow methods. So I started checking the code for react-vtk-js and paraview-lite to se…

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## [vtkDescriptiveStatistics output in vtk 7.1.1](https://discourse.vtk.org/t/vtkdescriptivestatistics-output-in-vtk-7-1-1/5584)

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**Author:** [@Jonas\_Grammens](https://discourse.vtk.org/u/Jonas_Grammens)\
**Replies:** 0\
**Last updated:** [April 19, 2021, 4:55pm UTC](https://discourse.vtk.org/t/vtkdescriptivestatistics-output-in-vtk-7-1-1/5584 "2021-04-19T16:55:41Z")

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Hi all, I am trying to calcalute some descriptive statistics from a vtkDoubleArray. So far, I created a vtkTable as input for the vtkDescriptiveStatistics object and set the columns, learn, derive and assess options. …

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## [std::thread as a new vtkSMPTools backend](https://discourse.vtk.org/t/std-thread-as-a-new-vtksmptools-backend/5525)

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**Author:** [@Timothee\_Couble](https://discourse.vtk.org/u/Timothee_Couble)\
**Replies:** 7\
**Last updated:** [April 19, 2021, 2:58pm UTC](https://discourse.vtk.org/t/std-thread-as-a-new-vtksmptools-backend/5525 "2021-04-19T14:58:57Z")

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Hi everyone, We would like to introduce std::thread as a new backend in the vtkSMPTools backend. As it won’t add any external dependencies it can be useful for user who can’t use directly OpenMP or TBB (for example on …

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## [Unwanted interpolation in vtkTexture](https://discourse.vtk.org/t/unwanted-interpolation-in-vtktexture/5556)

<div class="topic-metadata">

**Author:** [@marcomusy](https://discourse.vtk.org/u/marcomusy)\
**Replies:** 10\
**Last updated:** [April 19, 2021, 10:36am UTC](https://discourse.vtk.org/t/unwanted-interpolation-in-vtktexture/5556 "2021-04-19T10:36:16Z")

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In applying a texture to a mesh artifacts show up for edges linking different regions of the uv texture plane: import numpy as np txu = 'SMPL\_sampleTex\_m.jpg' uvmap = np.load('uv\_table.npy') import vtk from vtk.util.n…

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## [USE vtkWorldPointPicker EXCEPTION](https://discourse.vtk.org/t/use-vtkworldpointpicker-exception/5564)

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**Author:** [@fox-wangguodong](https://discourse.vtk.org/u/fox-wangguodong)\
**Replies:** 0\
**Last updated:** [April 18, 2021, 5:25am UTC](https://discourse.vtk.org/t/use-vtkworldpointpicker-exception/5564 "2021-04-18T05:25:25Z")

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When i use vtkWorldPointPicker to get world position from display coordinates; it say that: 2021-04-18 13:16:52.518 ( 18.223s) \[ 6D679800\] vtkOpenGLState.cxx:203 WARN| Error in cache state for GL\_READ\_FRAMEBUFFER\_BINDI…

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## [Correcting the Gantry Tilt in CT scans](https://discourse.vtk.org/t/correcting-the-gantry-tilt-in-ct-scans/5526)

<div class="topic-metadata">

**Author:** [@sanidhya26](https://discourse.vtk.org/u/sanidhya26)\
**Replies:** 29\
**Last updated:** [April 17, 2021, 10:16am UTC](https://discourse.vtk.org/t/correcting-the-gantry-tilt-in-ct-scans/5526 "2021-04-17T10:16:59Z")

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Hi I am using vtkDicomReader to read the scans and then using vtkDICOMCTRectifier for gantry tilt correction. Here is my code: rectify = vtkDICOMCTRectifier() rectify.SetVolumeMatrix(self.reader.GetPatientMatrix()) re…

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## [Status of the GitLab-CI migration](https://discourse.vtk.org/t/status-of-the-gitlab-ci-migration/5549)

<div class="topic-metadata">

**Author:** [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)\
**Replies:** 6\
**Last updated:** [April 16, 2021, 12:14pm UTC](https://discourse.vtk.org/t/status-of-the-gitlab-ci-migration/5549 "2021-04-16T12:14:05Z")

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As many have probably noticed, there is an in-progress migration to GitLab-CI for VTK. You can see CI jobs at the top of your Merge Request in the “Pipelines” tab. There are still a few builds that have not migrated and …

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## [Merging connected coplanar triangles and quads to create a boundary](https://discourse.vtk.org/t/merging-connected-coplanar-triangles-and-quads-to-create-a-boundary/5555)

<div class="topic-metadata">

**Author:** [@sboogert](https://discourse.vtk.org/u/sboogert)\
**Replies:** 1\
**Last updated:** [April 16, 2021, 10:52am UTC](https://discourse.vtk.org/t/merging-connected-coplanar-triangles-and-quads-to-create-a-boundary/5555 "2021-04-16T10:52:47Z")

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I have a polyData that has been created from a boolean meshing system. I would like to display the 3d polygons which represent the boundary of a connected set of coplanar triangles and quads. I have looked at vtkFeatureE…

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## [Reading PLY file with color](https://discourse.vtk.org/t/reading-ply-file-with-color/5538)

<div class="topic-metadata">

**Author:** [@csad6517](https://discourse.vtk.org/u/csad6517)\
**Replies:** 11\
**Last updated:** [April 15, 2021, 10:33pm UTC](https://discourse.vtk.org/t/reading-ply-file-with-color/5538 "2021-04-15T22:33:35Z")

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I have a PLY file (exported from Solidworks incl. vertex colors), which I want to visualize using vtk. The header information of the file shows that it contains some color information: ´ ply format binary\_little\_endia…

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## [2D Actors in 3D space](https://discourse.vtk.org/t/2d-actors-in-3d-space/5547)

<div class="topic-metadata">

**Author:** [@bigvalthoss](https://discourse.vtk.org/u/bigvalthoss)\
**Replies:** 0\
**Last updated:** [April 13, 2021, 8:50pm UTC](https://discourse.vtk.org/t/2d-actors-in-3d-space/5547 "2021-04-13T20:50:29Z")

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I am wondering about getting 2D actors to work in 3D space? Is there a way of putting them on a plane and setting the plane at a given position so that you can move around it?

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## [Vtk and Web workers](https://discourse.vtk.org/t/vtk-and-web-workers/5536)

<div class="topic-metadata">

**Author:** [@no2497](https://discourse.vtk.org/u/no2497)\
**Replies:** 7\
**Last updated:** [April 13, 2021, 4:03pm UTC](https://discourse.vtk.org/t/vtk-and-web-workers/5536 "2021-04-13T16:03:59Z")

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Hi! I’ll go straight to the point: has anybody ever tried to use Web workers with the vtkXMLImageDataReader from vtk.js? I have this .vti file that comes from a reconstruction on the server part of the application but w…

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