# Development

**URL:** https://discourse.vtk.org/c/development/7.md?page=26

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

**Page:** 27

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## [How to force render a vtkActor](https://discourse.vtk.org/t/how-to-force-render-a-vtkactor/9459)

<div class="topic-metadata">

**Author:** [@m-agour](https://discourse.vtk.org/u/m-agour)\
**Replies:** 2\
**Last updated:** [October 13, 2022, 2:02am UTC](https://discourse.vtk.org/t/how-to-force-render-a-vtkactor/9459 "2022-10-13T02:02:44Z")

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Hello VTK community, vtkActors that are not visible (outside camera range) seems to not getting rendered. I becomes an issue when I try to change the actor’s position using the shader (gl\_Position). The actor disappears…

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## [Trame with custom vtkmodules library](https://discourse.vtk.org/t/trame-with-custom-vtkmodules-library/9463)

<div class="topic-metadata">

**Author:** [@Kostas\_Politis](https://discourse.vtk.org/u/Kostas_Politis)\
**Replies:** 2\
**Last updated:** [October 12, 2022, 9:57am UTC](https://discourse.vtk.org/t/trame-with-custom-vtkmodules-library/9463 "2022-10-12T09:57:59Z")

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Hello all, I’m trying to use trame with a custom vtk python build (which adds a module that exposes an interface to an external library). Everything seems to work fine regarding the custom python extensions. However, wh…

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## [Zero input connections are not optional](https://discourse.vtk.org/t/zero-input-connections-are-not-optional/1500)

<div class="topic-metadata">

**Author:** [@at123](https://discourse.vtk.org/u/at123)\
**Replies:** 2\
**Last updated:** [February 21, 2021, 6:00am UTC](https://discourse.vtk.org/t/zero-input-connections-are-not-optional/1500 "2021-02-21T06:00:47Z")

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Hi, I have a program where the user will enter varying number of volumes to merge into one volume using BooleanOperationPolyDataFilter. I have two vtkBooleanOperationPolyDataFilter and depending on the situation, some p…

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## [Possible issue in vtkloguru with musl in 9.1.0](https://discourse.vtk.org/t/possible-issue-in-vtkloguru-with-musl-in-9-1-0/9526)

<div class="topic-metadata">

**Author:** [@waebbl](https://discourse.vtk.org/u/waebbl)\
**Replies:** 5\
**Last updated:** [October 4, 2022, 8:41pm UTC](https://discourse.vtk.org/t/possible-issue-in-vtkloguru-with-musl-in-9-1-0/9526 "2022-10-04T20:41:42Z")

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Hello, I received a bug report from a machine running musl when building vtkloguru module\[1\]. After looking into this, I noticed, there’s some logic in KWSys which handles missing execinfo.h properly. The build log att…

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## [VTK 9.2 Can't Compile PolyLine Example](https://discourse.vtk.org/t/vtk-9-2-cant-compile-polyline-example/9508)

<div class="topic-metadata">

**Author:** [@jzhang](https://discourse.vtk.org/u/jzhang)\
**Replies:** 3\
**Last updated:** [October 3, 2022, 5:50am UTC](https://discourse.vtk.org/t/vtk-9-2-cant-compile-polyline-example/9508 "2022-10-03T05:50:07Z")

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I’m trying to build a project that sends a PolyData message over IGTLink. However, when I copied over the C++ example for PolyLine, I get an error on the following line: polyLine-\>GetPointIds()-\>SetNumberOfIds(2) The e…

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## [VTK 9.2.0 Release Cycle](https://discourse.vtk.org/t/vtk-9-2-0-release-cycle/8149)

<div class="topic-metadata">

**Author:** [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)\
**Replies:** 9\
**Last updated:** [September 30, 2022, 6:49pm UTC](https://discourse.vtk.org/t/vtk-9-2-0-release-cycle/8149 "2022-09-30T18:49:21Z")

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Hi all, It’s about time for another VTK release. The CI dashboards have been stabilizing fairly well with just one flaky test (being excluded here) and it seems like a good time to start cutting a release. Tentative da…

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## [Orientation of plot within vtkChartMatrix](https://discourse.vtk.org/t/orientation-of-plot-within-vtkchartmatrix/1538)

<div class="topic-metadata">

**Author:** [@marco.reato](https://discourse.vtk.org/u/marco.reato)\
**Replies:** 1\
**Last updated:** [September 30, 2022, 9:18am UTC](https://discourse.vtk.org/t/orientation-of-plot-within-vtkchartmatrix/1538 "2022-09-30T09:18:04Z")

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Hello everyone, I’m currently building some 2D data visualization tools based on the vtkChartXY and vtkChartMatrix classes. I’ve started by looking at these two examples: https://lorensen.github.io/VTKExamples/site/Cx…

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## [How to connect Shaders to Actor2D?](https://discourse.vtk.org/t/how-to-connect-shaders-to-actor2d/9384)

<div class="topic-metadata">

**Author:** [@ganimtron\_10](https://discourse.vtk.org/u/ganimtron_10)\
**Replies:** 4\
**Last updated:** [September 28, 2022, 1:14am UTC](https://discourse.vtk.org/t/how-to-connect-shaders-to-actor2d/9384 "2022-09-28T01:14:40Z")

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I am trying to create something like this but using Actor2D. Reference: Varying Color — FURY 0.8.0.post102.dev0+g2832e935 documentation For this, I was trying to connect Shaders to Actor2D but it is not working as ex…

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## [Rendering performance for millions of voxels and polyhedrons](https://discourse.vtk.org/t/rendering-performance-for-millions-of-voxels-and-polyhedrons/9352)

<div class="topic-metadata">

**Author:** [@chrisiou](https://discourse.vtk.org/u/chrisiou)\
**Replies:** 6\
**Last updated:** [September 24, 2022, 8:40pm UTC](https://discourse.vtk.org/t/rendering-performance-for-millions-of-voxels-and-polyhedrons/9352 "2022-09-24T20:40:46Z")

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Hello everyone! I want to render (2D and 3D) many shapes, mostly polyhedrons and partially voxels. I group them into groups (do not worry how we decide on the grouping but it can be in the order of thousands) and we need…

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## [segmentation fault from Trackball Actor](https://discourse.vtk.org/t/segmentation-fault-from-trackball-actor/9423)

<div class="topic-metadata">

**Author:** [@GeorgeS](https://discourse.vtk.org/u/GeorgeS)\
**Replies:** 3\
**Last updated:** [September 23, 2022, 2:36am UTC](https://discourse.vtk.org/t/segmentation-fault-from-trackball-actor/9423 "2022-09-23T02:36:30Z")

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I need to know the center location of the actor being manipulated by vtkInteractorStyleTrackballActor. vtkInteractorStyleTrackballActor-\>InteractionProp-\>GetCenter() does this, and because InteractionProp is protected, …

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## [Green CI now required to merge branches](https://discourse.vtk.org/t/green-ci-now-required-to-merge-branches/9389)

<div class="topic-metadata">

**Author:** [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)\
**Replies:** 2\
**Last updated:** [September 22, 2022, 7:07pm UTC](https://discourse.vtk.org/t/green-ci-now-required-to-merge-branches/9389 "2022-09-22T19:07:23Z")

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Hi VTK developers, The dashboards have been fairly consistent lately and in an effort to keep them that way, the build stage of CI must now completely pass (complete and green) prior to merging. Testing is still allowed…

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## [VtkIO::xdmf python lib](https://discourse.vtk.org/t/vtkio-xdmf-python-lib/9424)

<div class="topic-metadata">

**Author:** [@Kostas\_Politis](https://discourse.vtk.org/u/Kostas_Politis)\
**Replies:** 6\
**Last updated:** [September 22, 2022, 11:47am UTC](https://discourse.vtk.org/t/vtkio-xdmf-python-lib/9424 "2022-09-22T11:47:40Z")

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Hello all, I’m trying to compile the vtkXdmfReader and expose it to python. Haven’t tried that much but I can guess that you can give me a headstart :slight\_smile: . So I compile VTK with python wrapping and everything …

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## [Strange in boolean (difference) operation](https://discourse.vtk.org/t/strange-in-boolean-difference-operation/9410)

<div class="topic-metadata">

**Author:** [@szm](https://discourse.vtk.org/u/szm)\
**Replies:** 2\
**Last updated:** [September 22, 2022, 2:22am UTC](https://discourse.vtk.org/t/strange-in-boolean-difference-operation/9410 "2022-09-22T02:22:29Z")

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Hi, I have two shapes. One is named slab, and the other named hole. I want to obtain a new slab excluding the hole shape. So I tried vtkBooleanOperationPolyDataFilter with difference operation in VTK 9.1.0. In the result…

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## [New feature in VTK: VTK ABI Namespace](https://discourse.vtk.org/t/new-feature-in-vtk-vtk-abi-namespace/9421)

<div class="topic-metadata">

**Author:** [@Ryan\_Krattiger](https://discourse.vtk.org/u/Ryan_Krattiger)\
**Replies:** 2\
**Last updated:** [September 21, 2022, 4:16pm UTC](https://discourse.vtk.org/t/new-feature-in-vtk-vtk-abi-namespace/9421 "2022-09-21T16:16:25Z")

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Overview The feature allowing projects to wrap VTK in an namespace has officially landed on master! The ABI namespace is intended to add a namespace that is visible in the compiled libraries, but opaque to the code. This…

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## [vessel-contours.vtkjs](https://discourse.vtk.org/t/vessel-contours-vtkjs/9358)

<div class="topic-metadata">

**Author:** [@Sohrab\_Azami](https://discourse.vtk.org/u/Sohrab_Azami)\
**Replies:** 1\
**Last updated:** [September 15, 2022, 11:26pm UTC](https://discourse.vtk.org/t/vessel-contours-vtkjs/9358 "2022-09-15T23:26:30Z")

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@Adrien\_Boucaud hi, i have question about vtkjs images. i want to use them in my multisliceimagemapper program. how to display this type of image in index.js file. is there a sample code how to show this format of ima…

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## [How to implement endoluminal rendering vtk?](https://discourse.vtk.org/t/how-to-implement-endoluminal-rendering-vtk/9354)

<div class="topic-metadata">

**Author:** [@Usha\_Diggi](https://discourse.vtk.org/u/Usha_Diggi)\
**Replies:** 0\
**Last updated:** [September 15, 2022, 10:23am UTC](https://discourse.vtk.org/t/how-to-implement-endoluminal-rendering-vtk/9354 "2022-09-15T10:23:10Z")

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Working CT data, can any help me about endoluminal rendering, is vtk support this kind of implementation?

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## [vtkConnectedPointsFilter does not support vtkPointSet](https://discourse.vtk.org/t/vtkconnectedpointsfilter-does-not-support-vtkpointset/9348)

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**Author:** [@gbene](https://discourse.vtk.org/u/gbene)\
**Replies:** 2\
**Last updated:** [September 15, 2022, 10:13am UTC](https://discourse.vtk.org/t/vtkconnectedpointsfilter-does-not-support-vtkpointset/9348 "2022-09-15T10:13:30Z")

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Hi! I was trying the newly concretized vtkPointSet class for dense pointcloud analysis and visualization. I wanted to calculate the connectivity of my point cloud using vtkConnectedPointsFilter() but it raises the follo…

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## [Show UnstructuredGrid as isosurface?](https://discourse.vtk.org/t/show-unstructuredgrid-as-isosurface/9306)

<div class="topic-metadata">

**Author:** [@lasc95](https://discourse.vtk.org/u/lasc95)\
**Replies:** 4\
**Last updated:** [September 15, 2022, 1:48am UTC](https://discourse.vtk.org/t/show-unstructuredgrid-as-isosurface/9306 "2022-09-15T01:48:50Z")

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Hi, I am new in VTK, and I have a vtk UnstructuredGridFile and I read it, but it show me with polygons and I need to deploy it as isosurface. This is my code I can’t upload an image (I am a new user here). I need help p…

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## [change blendMode in vtkResliceCursor](https://discourse.vtk.org/t/change-blendmode-in-vtkreslicecursor/9311)

<div class="topic-metadata">

**Author:** [@Alexandera](https://discourse.vtk.org/u/Alexandera)\
**Replies:** 0\
**Last updated:** [September 10, 2022, 4:11am UTC](https://discourse.vtk.org/t/change-blendmode-in-vtkreslicecursor/9311 "2022-09-10T04:11:50Z")

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My environment is Python 3.7.0 and VTK 9.1.0 I am realizing my own MPR application with example. The following is the snapshot on the rendering window. I know the class vtkResliceCursorWidget internally uses vtk vtk…

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## [Vtk9.1 for Qml with QQuickvtkrenderItem have some issues.](https://discourse.vtk.org/t/vtk9-1-for-qml-with-qquickvtkrenderitem-have-some-issues/7601)

<div class="topic-metadata">

**Author:** [@edwardAllen](https://discourse.vtk.org/u/edwardAllen)\
**Replies:** 6\
**Last updated:** [August 31, 2022, 2:53am UTC](https://discourse.vtk.org/t/vtk9-1-for-qml-with-qquickvtkrenderitem-have-some-issues/7601 "2022-08-31T02:53:20Z")

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Hi every developer , hope you can see this: I found some issues when I use vtk9.1 and qml .Below is the one description ： When I add a cameraorientationwidget with QQuickVTKInteractiveWidget by use QQuickVTKRenderIte…

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## [Activiz - implementing custom interactor style](https://discourse.vtk.org/t/activiz-implementing-custom-interactor-style/8946)

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**Author:** [@mortifiedpenguin](https://discourse.vtk.org/u/mortifiedpenguin)\
**Replies:** 4\
**Last updated:** [August 29, 2022, 8:54am UTC](https://discourse.vtk.org/t/activiz-implementing-custom-interactor-style/8946 "2022-08-29T08:54:25Z")

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Hi, I’m using Activiz with C# and want to use a custom interactor style. To this end I subclassed vtkInteractorStyleTrackballCamera and overriden the OnLeftButtonDown function. However, the overriden method is never cal…

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## [Fixing the unstable camera up vector when rotating horizontally](https://discourse.vtk.org/t/fixing-the-unstable-camera-up-vector-when-rotating-horizontally/9177)

<div class="topic-metadata">

**Author:** [@Martin3d](https://discourse.vtk.org/u/Martin3d)\
**Replies:** 8\
**Last updated:** [August 29, 2022, 6:51am UTC](https://discourse.vtk.org/t/fixing-the-unstable-camera-up-vector-when-rotating-horizontally/9177 "2022-08-29T06:51:29Z")

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When rotating the camera around a scene with vtkInteractorStyleTrackballCamera, there is a unsatisfying swinging effect that I would like to avoid. I mainly want to know if you agree with the solution before starting to …

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## [Possible improvement for MultiBlock deep copies](https://discourse.vtk.org/t/possible-improvement-for-multiblock-deep-copies/9152)

<div class="topic-metadata">

**Author:** [@patrick-laurin](https://discourse.vtk.org/u/patrick-laurin)\
**Replies:** 1\
**Last updated:** [August 29, 2022, 4:56am UTC](https://discourse.vtk.org/t/possible-improvement-for-multiblock-deep-copies/9152 "2022-08-29T04:56:19Z")

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Hi all, Today, I was questioning myself on the deep copy mechanism of the vtkMultiBlockDataSet vs. the shallow copy one. In the Shallow Copy, there is preservation of the metadata even if the child block’s data object …

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## [Build with qt6 qmlplugindump executable not found.](https://discourse.vtk.org/t/build-with-qt6-qmlplugindump-executable-not-found/8971)

<div class="topic-metadata">

**Author:** [@edwardAllen](https://discourse.vtk.org/u/edwardAllen)\
**Replies:** 3\
**Last updated:** [August 26, 2022, 2:43pm UTC](https://discourse.vtk.org/t/build-with-qt6-qmlplugindump-executable-not-found/8971 "2022-08-26T14:43:23Z")

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Bug report : qmlplugindump executable not found. Goto cmake file : VTK/GUISupport/QtQuick/qml/CMakeLists.txt Line : 68 get\_target\_property(qt\_qmake\_location "Qt${vtk\_qt\_major\_version}::qmake" LOCATION) get\_filename\_…

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## [Would compressed VTK arrays be a good idea?](https://discourse.vtk.org/t/would-compressed-vtk-arrays-be-a-good-idea/9178)

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**Author:** [@jfausty](https://discourse.vtk.org/u/jfausty)\
**Replies:** 13\
**Last updated:** [August 25, 2022, 10:35am UTC](https://discourse.vtk.org/t/would-compressed-vtk-arrays-be-a-good-idea/9178 "2022-08-25T10:35:03Z")

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Hi all, I am currently studying the feasibility of including implicit arrays (i.e. arrays that do not have allocated data in memory but that are instead implicit mappings/functions behind the scenes) into VTK. These new…

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## [specularPower = 0 yields black surfaces](https://discourse.vtk.org/t/specularpower-0-yields-black-surfaces/9215)

<div class="topic-metadata">

**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\
**Replies:** 0\
**Last updated:** [August 25, 2022, 7:40am UTC](https://discourse.vtk.org/t/specularpower-0-yields-black-surfaces/9215 "2022-08-25T07:40:25Z")

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With gouraud or flat shading, setting specular power to 0 causes the surface to be rendered all black. I ran into this strange issue in our Qt 5.15 and VTK 9.1 based FEA application on Intel UHD 770 graphics (and other …

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## [About how to run Wrapping Example](https://discourse.vtk.org/t/about-how-to-run-wrapping-example/9034)

<div class="topic-metadata">

**Author:** [@JessonWu](https://discourse.vtk.org/u/JessonWu)\
**Replies:** 1\
**Last updated:** [August 24, 2022, 1:15pm UTC](https://discourse.vtk.org/t/about-how-to-run-wrapping-example/9034 "2022-08-24T13:15:16Z")

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Hello I am just new to VTK. I am trying to build and run the Wrapping Example. I can compile and get the files “vtkWrappable.so” and “libvtkWrappable.so” built, but failed to run the test script “import\_wrappable.py”: …

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## [using vtkLabeledContourMapper got error message “Error must have verts, program and vao”](https://discourse.vtk.org/t/using-vtklabeledcontourmapper-got-error-message-error-must-have-verts-program-and-vao/8975)

<div class="topic-metadata">

**Author:** [@YuNie](https://discourse.vtk.org/u/YuNie)\
**Replies:** 3\
**Last updated:** [August 22, 2022, 2:30am UTC](https://discourse.vtk.org/t/using-vtklabeledcontourmapper-got-error-message-error-must-have-verts-program-and-vao/8975 "2022-08-22T02:30:44Z")

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hello! I was tring to use vtkLabeledContourMapper to show the contour line and label. But when I run my code, I got a message window shows that “Error must have verts, program and vao”. My code is shown as below. I k…

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## [Are UserTransforms going to be deprecated?](https://discourse.vtk.org/t/are-usertransforms-going-to-be-deprecated/9165)

<div class="topic-metadata">

**Author:** [@rdbrn](https://discourse.vtk.org/u/rdbrn)\
**Replies:** 0\
**Last updated:** [August 17, 2022, 4:50pm UTC](https://discourse.vtk.org/t/are-usertransforms-going-to-be-deprecated/9165 "2022-08-17T16:50:31Z")

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I’ve always been using SetUserTransform/Matrix to set the position of actors until I found something that didn’t work and I started looking for documentation of the UserTransform. Then I found this issue: Document vtkAc…

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## [How to create vtkPartitionedDataSet in parallel using SMP?](https://discourse.vtk.org/t/how-to-create-vtkpartitioneddataset-in-parallel-using-smp/9085)

<div class="topic-metadata">

**Author:** [@Cameron](https://discourse.vtk.org/u/Cameron)\
**Replies:** 4\
**Last updated:** [August 15, 2022, 5:22pm UTC](https://discourse.vtk.org/t/how-to-create-vtkpartitioneddataset-in-parallel-using-smp/9085 "2022-08-15T17:22:33Z")

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I need to create a number of vtkPartitionedDataSet object which is completely independent of each other. Then, they will be added to vtkPartitionedDataSetCollection. How do I parallelize this process? Are there any out …

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