# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=162

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

**Page:** 163

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## [Interpolating points and direction along a path in 3D space](https://discourse.vtk.org/t/interpolating-points-and-direction-along-a-path-in-3d-space/115)

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**Author:** [@kit](https://discourse.vtk.org/u/kit)\
**Replies:** 3\
**Last updated:** [February 16, 2019, 4:23am UTC](https://discourse.vtk.org/t/interpolating-points-and-direction-along-a-path-in-3d-space/115 "2019-02-16T04:23:26Z")

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Hi, This is my first go with discourse, so I hope I am using this correctly. If not feel free to re-file this post. I have a series of points on a path \[(x1,y1,z1)…(xN,yN,zN)\] and a function at the points \[f1,…,fN\] wh…

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## [vtkClipVolume usage](https://discourse.vtk.org/t/vtkclipvolume-usage/272)

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**Author:** [@francisco\_munoz](https://discourse.vtk.org/u/francisco_munoz)\
**Replies:** 3\
**Last updated:** [February 15, 2019, 5:26pm UTC](https://discourse.vtk.org/t/vtkclipvolume-usage/272 "2019-02-15T17:26:44Z")

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hi, Im trying to perform a clip on an unstructuredGrid over an scalars value, but cannot get the clipped object (it gives empty) or probably don’t know how to use it. My data doesn’t comes with the scalars but has a lo…

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## [How can I make vtkExtractSelectedIds return a vtkPolyData?](https://discourse.vtk.org/t/how-can-i-make-vtkextractselectedids-return-a-vtkpolydata/280)

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**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\
**Replies:** 0\
**Last updated:** [February 15, 2019, 1:15pm UTC](https://discourse.vtk.org/t/how-can-i-make-vtkextractselectedids-return-a-vtkpolydata/280 "2019-02-15T13:15:28Z")

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vtkExtractSelectedIds can return extracting cells as polydata even when preserving topology is off (template method vtkExtractSelectedIdsCopyCells is called with vtkPolyData as template argument). However the base class …

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## [Making 3d/2d pointcloud fill window without border/bounding cube](https://discourse.vtk.org/t/making-3d-2d-pointcloud-fill-window-without-border-bounding-cube/260)

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**Author:** [@thully](https://discourse.vtk.org/u/thully)\
**Replies:** 1\
**Last updated:** [February 12, 2019, 7:36pm UTC](https://discourse.vtk.org/t/making-3d-2d-pointcloud-fill-window-without-border-bounding-cube/260 "2019-02-12T19:36:56Z")

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Hi, I’m working on an application that displays a LIDAR pointcloud using VTK. It displays the pointcloud in both a 3D view and a 2D overhead view. I initially tried using vtkChartXY and vtkChartXYZ, though I want to us…

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## [Image plane Module](https://discourse.vtk.org/t/image-plane-module/256)

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**Author:** [@Anand\_Mulay](https://discourse.vtk.org/u/Anand_Mulay)\
**Replies:** 0\
**Last updated:** [February 11, 2019, 1:53pm UTC](https://discourse.vtk.org/t/image-plane-module/256 "2019-02-11T13:53:24Z")

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How can i use Image plane module of Dicom Data or any other method to get actual XYZ axis of the dicom image , e.g i have a dicom image 512X512 in which i can get XY points raneg in 0-512 starting from Left upper cor…

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## [Multiple colorized sphere objects mapping](https://discourse.vtk.org/t/multiple-colorized-sphere-objects-mapping/252)

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**Author:** [@ljc19800331](https://discourse.vtk.org/u/ljc19800331)\
**Replies:** 1\
**Last updated:** [February 11, 2019, 1:08pm UTC](https://discourse.vtk.org/t/multiple-colorized-sphere-objects-mapping/252 "2019-02-11T13:08:39Z")

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Hello, I am going to map the colorized point cloud to the sphere object (with multiple spheres) and generate a viewpoint-invariance object. The problem is that when I change the viewpoint close to the object the coloriz…

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## [Dicom images and progress rendering](https://discourse.vtk.org/t/dicom-images-and-progress-rendering/249)

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**Author:** [@Romain](https://discourse.vtk.org/u/Romain)\
**Replies:** 4\
**Last updated:** [February 10, 2019, 7:09am UTC](https://discourse.vtk.org/t/dicom-images-and-progress-rendering/249 "2019-02-10T07:09:06Z")

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Hello everyone, I work with DICOM series. Each series contain around 500 slices. I use the great module vtk-dicom to do all the reading part. During reading of those slices, is it possible to display the slice read? A…

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## [Seg Fault vtkXMLMultiBlockDataSetWriter with vtkPolyData](https://discourse.vtk.org/t/seg-fault-vtkxmlmultiblockdatasetwriter-with-vtkpolydata/237)

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**Author:** [@banesullivan](https://discourse.vtk.org/u/banesullivan)\
**Replies:** 2\
**Last updated:** [February 9, 2019, 6:32am UTC](https://discourse.vtk.org/t/seg-fault-vtkxmlmultiblockdatasetwriter-with-vtkpolydata/237 "2019-02-09T06:32:40Z")

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When I try to save a vtkMultiBlockDataSet that contains poly data that only has vertices, the vtkXMLMultiBlockDataSetWriter writer seg faults. Below is a snippet to reproduce this segfault in Python. Does anyone know of…

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## [How to disable vtkOutputWindow?](https://discourse.vtk.org/t/how-to-disable-vtkoutputwindow/242)

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**Author:** [@mdh](https://discourse.vtk.org/u/mdh)\
**Replies:** 2\
**Last updated:** [February 8, 2019, 2:30am UTC](https://discourse.vtk.org/t/how-to-disable-vtkoutputwindow/242 "2019-02-08T02:30:36Z")

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Hello, When an error occurs during the execution of a filter an instance of vtkOutputWindow is created internally in VTK and the error message gets shown. Once shown, the user is unable to kill this output window. I hav…

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## [Bug with depth peeling and offscreen rendering to an image](https://discourse.vtk.org/t/bug-with-depth-peeling-and-offscreen-rendering-to-an-image/223)

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**Author:** [@SergeLalonde](https://discourse.vtk.org/u/SergeLalonde)\
**Replies:** 3\
**Last updated:** [February 7, 2019, 3:59pm UTC](https://discourse.vtk.org/t/bug-with-depth-peeling-and-offscreen-rendering-to-an-image/223 "2019-02-07T15:59:44Z")

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I’m currently using VTK 8.1.1. My renderer has depth peeling enabled. When I render translucent objects to an image using vtkPNGWriter and offscreen rendering turned on, the renderer only succeeds the first time it’s r…

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## [ALL\_BUILD Access Denied](https://discourse.vtk.org/t/all-build-access-denied/231)

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**Author:** [@fengting](https://discourse.vtk.org/u/fengting)\
**Replies:** 3\
**Last updated:** [February 6, 2019, 9:03pm UTC](https://discourse.vtk.org/t/all-build-access-denied/231 "2019-02-06T21:03:40Z")

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I am new to VTK, and I am trying to compiling&installing C++ VTK. I have downloaded VTK-8.2.0 and follow the instruction like this : The VTK source code can be downloaded from http://www.vtk.org/ on the Download page…

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## [Show the cage axes](https://discourse.vtk.org/t/show-the-cage-axes/216)

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**Author:** [@cimo](https://discourse.vtk.org/u/cimo)\
**Replies:** 1\
**Last updated:** [February 6, 2019, 3:50pm UTC](https://discourse.vtk.org/t/show-the-cage-axes/216 "2019-02-06T15:50:14Z")

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Hello! I would like to display CubAxes of an object. For that I used vtkCubeAxesActor and I would like to display the static axes on all the edges (figure for example). using vtkCubeAxesActor calss ------\> Any ide…

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## [Arbitary Order Lagrange Hexahedron Connectivity](https://discourse.vtk.org/t/arbitary-order-lagrange-hexahedron-connectivity/76)

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**Author:** [@vrkssai](https://discourse.vtk.org/u/vrkssai)\
**Replies:** 1\
**Last updated:** [February 5, 2019, 8:32pm UTC](https://discourse.vtk.org/t/arbitary-order-lagrange-hexahedron-connectivity/76 "2019-02-05T20:32:04Z")

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The new versions of VTK&ParaView(5.5 and above) supports arbitary order lagrange hexahedron elements. The ordering of the points (lagrange points facepoints+interior+corners)associated with the elements hasn’t been provi…

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## [vtkUnstructuredGrid Phong and Gouraud shading](https://discourse.vtk.org/t/vtkunstructuredgrid-phong-and-gouraud-shading/198)

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**Author:** [@nebulaekg](https://discourse.vtk.org/u/nebulaekg)\
**Replies:** 0\
**Last updated:** [February 1, 2019, 5:34pm UTC](https://discourse.vtk.org/t/vtkunstructuredgrid-phong-and-gouraud-shading/198 "2019-02-01T17:34:49Z")

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Hi, I am new to VTK and try to figure out how to do Phong and Gouraud shading for a vtkUnstructuredGrid. I have tried vtkUnstructuredGrid --\> vtkDataSetSurfaceFilter --\> vtkPolyDataNormals --\> mapper, but still cannot ge…

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## [is it possible to use a PNG image as an icon entry of a vtkLegendBoxActor ?](https://discourse.vtk.org/t/is-it-possible-to-use-a-png-image-as-an-icon-entry-of-a-vtklegendboxactor/194)

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**Author:** [@embeddedmz](https://discourse.vtk.org/u/embeddedmz)\
**Replies:** 0\
**Last updated:** [February 1, 2019, 10:27am UTC](https://discourse.vtk.org/t/is-it-possible-to-use-a-png-image-as-an-icon-entry-of-a-vtklegendboxactor/194 "2019-02-01T10:27:13Z")

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Hi, The question is in the title. I tried that, but I only got a black square instead of the image. vtkNew\<vtkPNGReader\> reader; reader-\>SetFileName("icon.png"); vtkImageData\* icon = reader-\>GetOutput(); ... vtkSmartP…

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## [Subsampling UnstructuredGrid](https://discourse.vtk.org/t/subsampling-unstructuredgrid/190)

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**Author:** [@mdh](https://discourse.vtk.org/u/mdh)\
**Replies:** 0\
**Last updated:** [February 1, 2019, 2:32am UTC](https://discourse.vtk.org/t/subsampling-unstructuredgrid/190 "2019-02-01T02:32:28Z")

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Hello, Is there a filter that I can use to sub-sample an unstructured grid?

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## [vtkIOGDAL and vtkIOGeoJSON](https://discourse.vtk.org/t/vtkiogdal-and-vtkiogeojson/103)

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**Author:** [@embeddedmz](https://discourse.vtk.org/u/embeddedmz)\
**Replies:** 12\
**Last updated:** [January 31, 2019, 11:17am UTC](https://discourse.vtk.org/t/vtkiogdal-and-vtkiogeojson/103 "2019-01-31T11:17:37Z")

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Hi, I’m trying to build this project GitHub - OpenGeoscience/vtkMap: vtkMap with all options (GDAL and GeoJSON extensions) under Centos 7. The CMake configuration failed : /usr/lib64/cmake/vtk/vtkModuleAPI.cmake:120:…

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## [vtkPolydata : framerate for pointdata update. Possible speedup with vtk-m?](https://discourse.vtk.org/t/vtkpolydata-framerate-for-pointdata-update-possible-speedup-with-vtk-m/170)

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**Author:** [@indridi](https://discourse.vtk.org/u/indridi)\
**Replies:** 0\
**Last updated:** [January 30, 2019, 2:42pm UTC](https://discourse.vtk.org/t/vtkpolydata-framerate-for-pointdata-update-possible-speedup-with-vtk-m/170 "2019-01-30T14:42:52Z")

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Hi, I’m working on a VTK based program that has a fixed vtkPolyData model (points/triangles), with changing point (or cell) data. The polydata is then colored according to the point data field. The data is generated el…

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## [How to let vtkScalarBar showing marks for Text Annotation?](https://discourse.vtk.org/t/how-to-let-vtkscalarbar-showing-marks-for-text-annotation/131)

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**Author:** [@gabri470](https://discourse.vtk.org/u/gabri470)\
**Replies:** 5\
**Last updated:** [January 30, 2019, 3:43pm UTC](https://discourse.vtk.org/t/how-to-let-vtkscalarbar-showing-marks-for-text-annotation/131 "2019-01-30T15:43:53Z")

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Dear Vtk Experts, I am trying to add to a vtkScalarbar tick marks in order to link TextAnnotation objects to actual value in colorbar. I tried in python by using lab.color = (0,0,0) pp = sc.trait\_get('\_vtk\_obj')\['\_vt…

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## [Any way to insert comments in a file created by vtkXMLImageDataWriter](https://discourse.vtk.org/t/any-way-to-insert-comments-in-a-file-created-by-vtkxmlimagedatawriter/161)

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**Author:** [@vnpavanelli](https://discourse.vtk.org/u/vnpavanelli)\
**Replies:** 3\
**Last updated:** [January 29, 2019, 6:24pm UTC](https://discourse.vtk.org/t/any-way-to-insert-comments-in-a-file-created-by-vtkxmlimagedatawriter/161 "2019-01-29T18:24:28Z")

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Is there any way to insert a comment into a .VTI file using the vtkXMLImageDataWriter or other VTK class that generate .VTI? I’m trying to record some information on how I created the VTI data, like the original dataset…

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## [Order of coordinate arrays for RectilinearGrid written by Xdmf3Writer](https://discourse.vtk.org/t/order-of-coordinate-arrays-for-rectilineargrid-written-by-xdmf3writer/147)

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**Author:** [@lugia-kun](https://discourse.vtk.org/u/lugia-kun)\
**Replies:** 2\
**Last updated:** [January 29, 2019, 11:01am UTC](https://discourse.vtk.org/t/order-of-coordinate-arrays-for-rectilineargrid-written-by-xdmf3writer/147 "2019-01-29T11:01:53Z")

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For the following program, which writes a RectilinearGrid dataset with Xdmf3Writer, I found that the coordinate arrays in the geometry type of VXVYVZ are written in order of Z, Y and then X. #include "vtkSmartPointer.h"…

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## [How to specify colors for leaf nodes of a nested vtkMultiBlockDataSet](https://discourse.vtk.org/t/how-to-specify-colors-for-leaf-nodes-of-a-nested-vtkmultiblockdataset/156)

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**Author:** [@Haocheng\_Liu](https://discourse.vtk.org/u/Haocheng_Liu)\
**Replies:** 0\
**Last updated:** [January 28, 2019, 2:35pm UTC](https://discourse.vtk.org/t/how-to-specify-colors-for-leaf-nodes-of-a-nested-vtkmultiblockdataset/156 "2019-01-28T14:35:43Z")

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Hi vtk developers, I have a use case that my data is a composite nested vtkMultiBlockDatasets and I want to specify colors for its subblocks. Ex. Root node: 1 vtkMultiblockDataset(node 0) First level node: 1 vtkMulti…

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## [A good strategy to label a particular point of a vtkPolyData (or display a something near it)](https://discourse.vtk.org/t/a-good-strategy-to-label-a-particular-point-of-a-vtkpolydata-or-display-a-something-near-it/134)

<div class="topic-metadata">

**Author:** [@embeddedmz](https://discourse.vtk.org/u/embeddedmz)\
**Replies:** 0\
**Last updated:** [January 25, 2019, 4:04pm UTC](https://discourse.vtk.org/t/a-good-strategy-to-label-a-particular-point-of-a-vtkpolydata-or-display-a-something-near-it/134 "2019-01-25T16:04:43Z")

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Hello, There’s this example https://vtk.org/Wiki/VTK/Examples/Cxx/Visualization/LabeledDataMapper of vtkLabeledDataMapper but I don’t want to label all points, is there a way to label only a point with that class ? If …

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## [Unable to build INSTALL using VTK master on Visual Studio 2015](https://discourse.vtk.org/t/unable-to-build-install-using-vtk-master-on-visual-studio-2015/98)

<div class="topic-metadata">

**Author:** [@Donny\_Zimmerman](https://discourse.vtk.org/u/Donny_Zimmerman)\
**Replies:** 4\
**Last updated:** [January 24, 2019, 4:23pm UTC](https://discourse.vtk.org/t/unable-to-build-install-using-vtk-master-on-visual-studio-2015/98 "2019-01-24T16:23:00Z")

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I am getting the following error in Visual Studio 2015 when trying to build the INSTALL project generated by cmake: CMake Error at Utilities/KWIML/cmake\_install.cmake:36 (file): 101\> file cannot create directory: 1…

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