# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=69

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

**Page:** 70

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## [Update multiple algorithms concurrently](https://discourse.vtk.org/t/update-multiple-algorithms-concurrently/9228)

<div class="topic-metadata">

**Author:** [@Olivier](https://discourse.vtk.org/u/Olivier)\
**Replies:** 5\
**Last updated:** [August 29, 2022, 1:36pm UTC](https://discourse.vtk.org/t/update-multiple-algorithms-concurrently/9228 "2022-08-29T13:36:40Z")

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Hi Friends, My use case involves a unique AppendPolyData, which input is many PolyDataAlgorithm (connected with SetInputConnectionByNumber). Inputs PolyDataAlgorithm are totally independent each-others, and can be quit…

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## [How to draw lines in VTK so they can be displayed in paraview](https://discourse.vtk.org/t/how-to-draw-lines-in-vtk-so-they-can-be-displayed-in-paraview/9200)

<div class="topic-metadata">

**Author:** [@anirudh\_puligandla](https://discourse.vtk.org/u/anirudh_puligandla)\
**Replies:** 4\
**Last updated:** [August 29, 2022, 8:14am UTC](https://discourse.vtk.org/t/how-to-draw-lines-in-vtk-so-they-can-be-displayed-in-paraview/9200 "2022-08-29T08:14:27Z")

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I am trying draw a primitive scene with multiple polyData objects, write them into .ply file and view it using paraview. So far I am able to display an ellipsoid source, two sets of arrow sources showing axes of cameras …

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## [How to update 2D Slicing Data and 3D graphics syschronously in FourPaneViewer (VTK9.2 Examples)](https://discourse.vtk.org/t/how-to-update-2d-slicing-data-and-3d-graphics-syschronously-in-fourpaneviewer-vtk9-2-examples/9234)

<div class="topic-metadata">

**Author:** [@kuangliu774392519](https://discourse.vtk.org/u/kuangliu774392519)\
**Replies:** 0\
**Last updated:** [August 29, 2022, 1:47am UTC](https://discourse.vtk.org/t/how-to-update-2d-slicing-data-and-3d-graphics-syschronously-in-fourpaneviewer-vtk9-2-examples/9234 "2022-08-29T01:47:39Z")

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Lately I encountered some difficulties. I need to implement a function in FourPaneViewer(VTK9.2 Example).When I roll the mouse wheel,2D Slicing Data and 3D graphics will update at the same time.What should i do to acco…

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## [ActiViz and WPF Slider](https://discourse.vtk.org/t/activiz-and-wpf-slider/9160)

<div class="topic-metadata">

**Author:** [@a772485252](https://discourse.vtk.org/u/a772485252)\
**Replies:** 1\
**Last updated:** [August 29, 2022, 4:39am UTC](https://discourse.vtk.org/t/activiz-and-wpf-slider/9160 "2022-08-29T04:39:02Z")

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When I drag the slider to render, the value of the slider will jump to the maximum or minimum value and then come back. Annotate render, and the slider will be normal. private void slider\_ValueChanged(object sender,Rout…

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## [MPR how to adjusts window width and window level synchronously?](https://discourse.vtk.org/t/mpr-how-to-adjusts-window-width-and-window-level-synchronously/9205)

<div class="topic-metadata">

**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 1\
**Last updated:** [August 29, 2022, 1:42am UTC](https://discourse.vtk.org/t/mpr-how-to-adjusts-window-width-and-window-level-synchronously/9205 "2022-08-29T01:42:52Z")

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for MPR model how to adjusts window width and window level synchronously?

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## [Distance scalar computation between surface and polyline](https://discourse.vtk.org/t/distance-scalar-computation-between-surface-and-polyline/9225)

<div class="topic-metadata">

**Author:** [@DFlyer](https://discourse.vtk.org/u/DFlyer)\
**Replies:** 1\
**Last updated:** [August 28, 2022, 1:49pm UTC](https://discourse.vtk.org/t/distance-scalar-computation-between-surface-and-polyline/9225 "2022-08-28T13:49:23Z")

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Hello all! I have a polydata with triangle cells (surface) and another polydata with polyline cells. I need scalar distance values on surface computed from polyline. I tried these, vtkDistancePolyDataFilter - Works o…

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## [Zoom without scaling](https://discourse.vtk.org/t/zoom-without-scaling/9224)

<div class="topic-metadata">

**Author:** [@DStranz](https://discourse.vtk.org/u/DStranz)\
**Replies:** 3\
**Last updated:** [August 28, 2022, 12:37pm UTC](https://discourse.vtk.org/t/zoom-without-scaling/9224 "2022-08-28T12:37:51Z")

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I am creating a 3D scatterplot of spheres where each sphere might have a different size and spheres could overlap. I have a 2D implementation of this in Qt using circles where as I zoom in, the circles remain a constant…

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## [Occasional access violation exception from during vtkRendering](https://discourse.vtk.org/t/occasional-access-violation-exception-from-during-vtkrendering/9140)

<div class="topic-metadata">

**Author:** [@jj\_seaspn](https://discourse.vtk.org/u/jj_seaspn)\
**Replies:** 2\
**Last updated:** [August 26, 2022, 2:40pm UTC](https://discourse.vtk.org/t/occasional-access-violation-exception-from-during-vtkrendering/9140 "2022-08-26T14:40:43Z")

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We are facing occasional runtime crashes from NVIDIA and VTK due to the Access Violation exception. We are using vtk 8.1.0. Please suggest if this is any known problem and any solution or workaround exists. Exception me…

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## [vtkOBBTree not giving full coverage even for the sample solid](https://discourse.vtk.org/t/vtkobbtree-not-giving-full-coverage-even-for-the-sample-solid/9219)

<div class="topic-metadata">

**Author:** [@marcocecchiscmgroup](https://discourse.vtk.org/u/marcocecchiscmgroup)\
**Replies:** 4\
**Last updated:** [August 26, 2022, 12:21pm UTC](https://discourse.vtk.org/t/vtkobbtree-not-giving-full-coverage-even-for-the-sample-solid/9219 "2022-08-26T12:21:02Z")

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The example VisualizeOBBTree, when run with NumberOfCellsPerNode = 5 and MaxLevel = 10 gives what follows for the sample solid, a simple convex sphere-like solid. Why is that? The header comments in the source code …

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## [Question about vtkImageStencil](https://discourse.vtk.org/t/question-about-vtkimagestencil/9217)

<div class="topic-metadata">

**Author:** [@Hanxin\_Hua](https://discourse.vtk.org/u/Hanxin_Hua)\
**Replies:** 2\
**Last updated:** [August 25, 2022, 8:11pm UTC](https://discourse.vtk.org/t/question-about-vtkimagestencil/9217 "2022-08-25T20:11:32Z")

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Hi, do the stencil and the input need to be the same size while using vtkImageStencil? vtkSmartPointer\<vtkImageData\> RemoveOsteotomyFromImage(vtkImageData\* imageWithOsteotomy, vtkImageData\* imageToRemoveOsteotomy) { vt…

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## [Labels not appearing flush on the face on vtkhexahedron](https://discourse.vtk.org/t/labels-not-appearing-flush-on-the-face-on-vtkhexahedron/9210)

<div class="topic-metadata">

**Author:** [@ujjwala](https://discourse.vtk.org/u/ujjwala)\
**Replies:** 0\
**Last updated:** [August 25, 2022, 3:10am UTC](https://discourse.vtk.org/t/labels-not-appearing-flush-on-the-face-on-vtkhexahedron/9210 "2022-08-25T03:10:18Z")

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Hi VTK experts, I’m displaying a bunch of vtkHexahedrons in an vtkUnstructuredGrid and trying to display custom labels on each face/side of each hexahedron. I’m currently using one actor for the vtkUnstructuredGrid and …

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## [Hide/Show (Minimize/Maximize) vtkRenderer](https://discourse.vtk.org/t/hide-show-minimize-maximize-vtkrenderer/9190)

<div class="topic-metadata">

**Author:** [@BJladika](https://discourse.vtk.org/u/BJladika)\
**Replies:** 1\
**Last updated:** [August 23, 2022, 8:11pm UTC](https://discourse.vtk.org/t/hide-show-minimize-maximize-vtkrenderer/9190 "2022-08-23T20:11:04Z")

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Hello, I have this piece of code, which puts 4 vtkRenderers in 1 Window, which are separated (aka 4 screens in 1 window). And I wanted to make feature of Maximize/Minimizing each screen, and thats where I’ve stuck. I th…

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## [Reader for ITK transforms?](https://discourse.vtk.org/t/reader-for-itk-transforms/9201)

<div class="topic-metadata">

**Author:** [@Gabriel\_Devenyi](https://discourse.vtk.org/u/Gabriel_Devenyi)\
**Replies:** 0\
**Last updated:** [August 23, 2022, 7:24pm UTC](https://discourse.vtk.org/t/reader-for-itk-transforms/9201 "2022-08-23T19:24:39Z")

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Is there a vtk reader for ITK transforms? Right now I’m having to manually deconstruct and insert the matrix values from an ITK function into VTK.

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## [How to disable interpolation (bluring image) in vtkResliceCursorWidget?](https://discourse.vtk.org/t/how-to-disable-interpolation-bluring-image-in-vtkreslicecursorwidget/9191)

<div class="topic-metadata">

**Author:** [@BJladika](https://discourse.vtk.org/u/BJladika)\
**Replies:** 1\
**Last updated:** [August 23, 2022, 6:59pm UTC](https://discourse.vtk.org/t/how-to-disable-interpolation-bluring-image-in-vtkreslicecursorwidget/9191 "2022-08-23T18:59:13Z")

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Hello, as I’ve previously written in other topic, I’ve found that piece of code of running Multi Planar Reconstruction via vtkResliceCursorWidget and I wanted to run it, but it shows images blurred (can’t see raw pixels)…

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## [vtkShadowMapPass causes actor picking doesn't work,and the actors with vtkUnstructuredGrid source don't show anymore](https://discourse.vtk.org/t/vtkshadowmappass-causes-actor-picking-doesnt-work-and-the-actors-with-vtkunstructuredgrid-source-dont-show-anymore/9197)

<div class="topic-metadata">

**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 0\
**Last updated:** [August 23, 2022, 9:39am UTC](https://discourse.vtk.org/t/vtkshadowmappass-causes-actor-picking-doesnt-work-and-the-actors-with-vtkunstructuredgrid-source-dont-show-anymore/9197 "2022-08-23T09:39:49Z")

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Hello,to enable shadow,vtkShadowMapPass is added like this: //enable light shadow showing vtkNew shadows; vtkNew seq; vtkNew passes; passes-\>AddItem(shadows-\>GetShadowMapBakerPass()); passes-\>AddIt…

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## [How to make MPR adaptive window size?](https://discourse.vtk.org/t/how-to-make-mpr-adaptive-window-size/9195)

<div class="topic-metadata">

**Author:** [@wulicheng](https://discourse.vtk.org/u/wulicheng)\
**Replies:** 0\
**Last updated:** [August 23, 2022, 8:52am UTC](https://discourse.vtk.org/t/how-to-make-mpr-adaptive-window-size/9195 "2022-08-23T08:52:07Z")

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Beacause of different image size, some MPR show very small in the render window,and How to make MPR adaptive window size?

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## [How to pick vtkLODProp3D?](https://discourse.vtk.org/t/how-to-pick-vtklodprop3d/9184)

<div class="topic-metadata">

**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 1\
**Last updated:** [August 23, 2022, 6:06am UTC](https://discourse.vtk.org/t/how-to-pick-vtklodprop3d/9184 "2022-08-23T06:06:03Z")

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After changing from vtkActor to vtkLODProp3D, vtkNew\<vtkPropPicker\> picker; picker-\>Pick(upPos\[0\], upPos\[1\], 0, this-\>GetCurrentRenderer()); if (picker-\>GetProp3D() == nullptr && picker-\>GetActor() == nullptr && pic…

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## [transparent objects not rendered with vtk9 and mesa 18.3.6 on centos7](https://discourse.vtk.org/t/transparent-objects-not-rendered-with-vtk9-and-mesa-18-3-6-on-centos7/9189)

<div class="topic-metadata">

**Author:** [@ErroMsg](https://discourse.vtk.org/u/ErroMsg)\
**Replies:** 0\
**Last updated:** [August 23, 2022, 2:56am UTC](https://discourse.vtk.org/t/transparent-objects-not-rendered-with-vtk9-and-mesa-18-3-6-on-centos7/9189 "2022-08-23T02:56:38Z")

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I tried to use VTK 9.0.2 to show transparent objects on CentOS-7 with mesa , but the objects which is set opacity less than 1.0 will not render. I’v tried use LIBGL\_ALWAYS\_SOFTWARE=1 , it doesn’t work. Has anyone usi…

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## [How do put different labels/annotations on faces of VTKHexahedron](https://discourse.vtk.org/t/how-do-put-different-labels-annotations-on-faces-of-vtkhexahedron/9173)

<div class="topic-metadata">

**Author:** [@ujjwala](https://discourse.vtk.org/u/ujjwala)\
**Replies:** 4\
**Last updated:** [August 22, 2022, 11:31pm UTC](https://discourse.vtk.org/t/how-do-put-different-labels-annotations-on-faces-of-vtkhexahedron/9173 "2022-08-22T23:31:31Z")

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Hi VTK experts, I’m new to VTK and I cannot seem to figure out how to put different text annotations/labels on the faces of a VTKHexahedron. I’m displaying a thousands of cubes ( implemented using vtkhexahedrons) stack…

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## [For vtkLODProp3D switching,is possible to get the previous LOD ID?](https://discourse.vtk.org/t/for-vtklodprop3d-switching-is-possible-to-get-the-previous-lod-id/9182)

<div class="topic-metadata">

**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 0\
**Last updated:** [August 21, 2022, 3:10pm UTC](https://discourse.vtk.org/t/for-vtklodprop3d-switching-is-possible-to-get-the-previous-lod-id/9182 "2022-08-21T15:10:37Z")

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Hello,there four methods to get LOD ID GetLastRenderedLODID GetSelectedPickLODID GetSelectedLODID GetPickLODID But their api docs are quite confusing for me,so I add an observer to render windows to listen ModifiedEven…

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## [How to disable interpolation (bluring image) in ImagePlaneWidget?](https://discourse.vtk.org/t/how-to-disable-interpolation-bluring-image-in-imageplanewidget/9172)

<div class="topic-metadata">

**Author:** [@BJladika](https://discourse.vtk.org/u/BJladika)\
**Replies:** 3\
**Last updated:** [August 19, 2022, 3:06pm UTC](https://discourse.vtk.org/t/how-to-disable-interpolation-bluring-image-in-imageplanewidget/9172 "2022-08-19T15:06:35Z")

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Hello, I’ve found that piece of code of running Multi Planar Reconstruction via ImagePlaneWidget and I wanted to run it, but it shows images blurred (can’t see raw pixels). I wanted to disable interpolation, but it seems…

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## [vtksys 9.2 Debug vs. Release mode](https://discourse.vtk.org/t/vtksys-9-2-debug-vs-release-mode/9163)

<div class="topic-metadata">

**Author:** [@ShaneKirkbride](https://discourse.vtk.org/u/ShaneKirkbride)\
**Replies:** 3\
**Last updated:** [August 19, 2022, 11:47am UTC](https://discourse.vtk.org/t/vtksys-9-2-debug-vs-release-mode/9163 "2022-08-19T11:47:49Z")

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I’m running a windows 11 environment compiling with VS2019. I complied 9.2.rc2 in release and in debug mode. I followed the example: https://kitware.github.io/vtk-examples/site/Cxx/Utilities/FilenameFunctions/ In Debu…

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## [how to combine two different vtk file?](https://discourse.vtk.org/t/how-to-combine-two-different-vtk-file/9170)

<div class="topic-metadata">

**Author:** [@Zhao412](https://discourse.vtk.org/u/Zhao412)\
**Replies:** 1\
**Last updated:** [August 19, 2022, 3:10am UTC](https://discourse.vtk.org/t/how-to-combine-two-different-vtk-file/9170 "2022-08-19T03:10:20Z")

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i have two different vtk file,both are RECTILINEAR\_GRID could i combine these into one vtk file? vtk DataFile Version 4.2 vtk output ASCII DATASET RECTILINEAR\_GRID DIMENSIONS 11 11 11 X\_COORDINATES 11 double -20.0…

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## [VTK 9.2 : Picking cells by adding another actor containing only these cells cause weird rendering effect](https://discourse.vtk.org/t/vtk-9-2-picking-cells-by-adding-another-actor-containing-only-these-cells-cause-weird-rendering-effect/9119)

<div class="topic-metadata">

**Author:** [@KEN](https://discourse.vtk.org/u/KEN)\
**Replies:** 3\
**Last updated:** [August 17, 2022, 6:20pm UTC](https://discourse.vtk.org/t/vtk-9-2-picking-cells-by-adding-another-actor-containing-only-these-cells-cause-weird-rendering-effect/9119 "2022-08-17T18:20:33Z")

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In my program, I add actor containing only the selected cells on the top of the actor containing all cells. The first actor containing all cells has front face color gray(0.5,0.5,0.5) and back face color yellow(0.8,0.8,…

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## [Clean reset polydata normals](https://discourse.vtk.org/t/clean-reset-polydata-normals/8842)

<div class="topic-metadata">

**Author:** [@micheleivani](https://discourse.vtk.org/u/micheleivani)\
**Replies:** 11\
**Last updated:** [August 17, 2022, 9:16am UTC](https://discourse.vtk.org/t/clean-reset-polydata-normals/8842 "2022-08-17T09:16:13Z")

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I’m building a feature that requires turning on and off the splitting option inside the vtkPolyDataNormals filter after a user action. The problem is the recalling of the normal filter on the polydata coming from the pre…

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## [Build an desktop application using vtk](https://discourse.vtk.org/t/build-an-desktop-application-using-vtk/8542)

<div class="topic-metadata">

**Author:** [@FrancoisW](https://discourse.vtk.org/u/FrancoisW)\
**Replies:** 7\
**Last updated:** [August 17, 2022, 12:15am UTC](https://discourse.vtk.org/t/build-an-desktop-application-using-vtk/8542 "2022-08-17T00:15:24Z")

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Hi, I’m going to create an application for windows and macOS. I want to use the vtk library to visualize some data in this application. I’m not sure which framework to use to create my GUI. Can anybody tell me what will…

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## [Can I return cell types from a vtkPolyData using the Python bindings](https://discourse.vtk.org/t/can-i-return-cell-types-from-a-vtkpolydata-using-the-python-bindings/9159)

<div class="topic-metadata">

**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 2\
**Last updated:** [August 16, 2022, 11:59pm UTC](https://discourse.vtk.org/t/can-i-return-cell-types-from-a-vtkpolydata-using-the-python-bindings/9159 "2022-08-16T23:59:21Z")

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Hello!!! I’m trying to read the cell types in a vtkPolyData using the vtk Python bindings. The method returns the cell types by reference. virtual void vtkDataSet::GetCellTypes ( vtkCellTypes \* types ) I’m trying to…

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## [PoissonReconstruction](https://discourse.vtk.org/t/poissonreconstruction/4777)

<div class="topic-metadata">

**Author:** [@SArbabi](https://discourse.vtk.org/u/SArbabi)\
**Replies:** 14\
**Last updated:** [August 16, 2022, 6:43pm UTC](https://discourse.vtk.org/t/poissonreconstruction/4777 "2022-08-16T18:43:36Z")

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to use PoissonReconstruction in VTK in the examples site, it says to: Enable the remote module by setting Module\_PoissonReconstruction:BOOL=ON. but where in the building process I should do this setting? it’s not one o…

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## [VTK 9.1: How to specify install dir for python modules?](https://discourse.vtk.org/t/vtk-9-1-how-to-specify-install-dir-for-python-modules/9155)

<div class="topic-metadata">

**Author:** [@Sophonet](https://discourse.vtk.org/u/Sophonet)\
**Replies:** 2\
**Last updated:** [August 16, 2022, 4:38pm UTC](https://discourse.vtk.org/t/vtk-9-1-how-to-specify-install-dir-for-python-modules/9155 "2022-08-16T16:38:43Z")

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Hi, currently, on Windows, python modules are installed in ${CMAKE\_INSTALL\_PREFIX}/bin/Lib/site-packages, which is not common. I would like to have them installed in ${CMAKE\_INSTALL\_PREFIX}/lib/site-packages but have not…

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## [Is it possible to create a light with spot like a ring?](https://discourse.vtk.org/t/is-it-possible-to-create-a-light-with-spot-like-a-ring/9145)

<div class="topic-metadata">

**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 1\
**Last updated:** [August 16, 2022, 2:05pm UTC](https://discourse.vtk.org/t/is-it-possible-to-create-a-light-with-spot-like-a-ring/9145 "2022-08-16T14:05:46Z")

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Hello,the ring spot must be a ring like this: Is it possible to implement it in VTK?

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