# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=152

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

**Page:** 153

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## [Cant read a special type of DICOM by VTK](https://discourse.vtk.org/t/cant-read-a-special-type-of-dicom-by-vtk/1367)

<div class="topic-metadata">

**Author:** [@aneeshikmat](https://discourse.vtk.org/u/aneeshikmat)\
**Replies:** 6\
**Last updated:** [July 19, 2019, 4:35am UTC](https://discourse.vtk.org/t/cant-read-a-special-type-of-dicom-by-vtk/1367 "2019-07-19T04:35:20Z")

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I write code using VTK (c++) which its can read dicom file, and its work prefect and tested for CT, and MRI…but I got error when I try to view dicom file which its an Video, and in normal viewer in VTK return Segmenta…

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## [light on 3d data](https://discourse.vtk.org/t/light-on-3d-data/1375)

<div class="topic-metadata">

**Author:** [@kondreti](https://discourse.vtk.org/u/kondreti)\
**Replies:** 0\
**Last updated:** [July 18, 2019, 9:23am UTC](https://discourse.vtk.org/t/light-on-3d-data/1375 "2019-07-18T09:23:51Z")

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How to focus light on 3d object at particular angle

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## [build fails while downloading external data file](https://discourse.vtk.org/t/build-fails-while-downloading-external-data-file/1371)

<div class="topic-metadata">

**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\
**Replies:** 2\
**Last updated:** [July 18, 2019, 8:05am UTC](https://discourse.vtk.org/t/build-fails-while-downloading-external-data-file/1371 "2019-07-18T08:05:46Z")

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It’s been a while since I’ve built VTK, and now I updated to 52157f40f47ce4f5be55f223258f1d7bfefcf60e and tried to build my squeaky clean clone of origin/master. I get a failure that some file cannot be downloaded: -- F…

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## [how to close the vtkRenderWindow with program](https://discourse.vtk.org/t/how-to-close-the-vtkrenderwindow-with-program/1308)

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**Author:** [@pingdan](https://discourse.vtk.org/u/pingdan)\
**Replies:** 3\
**Last updated:** [July 17, 2019, 11:50am UTC](https://discourse.vtk.org/t/how-to-close-the-vtkrenderwindow-with-program/1308 "2019-07-17T11:50:34Z")

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I create a vtkRenderWindow and display image. when I click the ‘x’ icon on the top right ,the vtkRenderWindow can close. Now I want to know how can I close the window with program code.

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## [vtkPolyData with vtkTetra](https://discourse.vtk.org/t/vtkpolydata-with-vtktetra/1355)

<div class="topic-metadata">

**Author:** [@marcomusy](https://discourse.vtk.org/u/marcomusy)\
**Replies:** 2\
**Last updated:** [July 17, 2019, 10:50am UTC](https://discourse.vtk.org/t/vtkpolydata-with-vtktetra/1355 "2019-07-17T10:50:18Z")

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In this slightly modified version of this example: import vtk points = vtk.vtkPoints() points.InsertNextPoint(0, 0, 0) points.InsertNextPoint(1, 0, 0) points.InsertNextPoint(1, 1, 0) points.InsertNextPoint(0, 1, 1) po…

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## [vtkColorTransferFunction's color spaces](https://discourse.vtk.org/t/vtkcolortransferfunctions-color-spaces/1363)

<div class="topic-metadata">

**Author:** [@embeddedmz](https://discourse.vtk.org/u/embeddedmz)\
**Replies:** 0\
**Last updated:** [July 17, 2019, 9:00am UTC](https://discourse.vtk.org/t/vtkcolortransferfunctions-color-spaces/1363 "2019-07-17T09:00:19Z")

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Hello, vtkColorTransferFunction has 4 color spaces : RGB, HSV, Lab (or CIELAB) and Diverging. Can someone tell me what are exactly Lab and Diverging color spaces ? In code’s comment : Diverging is a special mode whe…

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## [vtkImageViewer2: visualizing RGB data](https://discourse.vtk.org/t/vtkimageviewer2-visualizing-rgb-data/1362)

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**Author:** [@Maina](https://discourse.vtk.org/u/Maina)\
**Replies:** 0\
**Last updated:** [July 17, 2019, 7:46am UTC](https://discourse.vtk.org/t/vtkimageviewer2-visualizing-rgb-data/1362 "2019-07-17T07:46:51Z")

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Good morning, I am trying to visualize a RGB image using vtkImageViewer2 in python. The image is a combination of a grayscale CTA image (which I have converted to a 3 channel image using np.stack) and a mask in its red …

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## [invalid use of incomplete type ‘class vtkPolyData’](https://discourse.vtk.org/t/invalid-use-of-incomplete-type-class-vtkpolydata/1337)

<div class="topic-metadata">

**Author:** [@nicoco](https://discourse.vtk.org/u/nicoco)\
**Replies:** 5\
**Last updated:** [July 16, 2019, 8:57am UTC](https://discourse.vtk.org/t/invalid-use-of-incomplete-type-class-vtkpolydata/1337 "2019-07-16T08:57:04Z")

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Hello everyone, I would like to test whether an array is present in a polydata, but I am getting this error at compile time: NicocoTest.cxx:10:39: error: invalid use of incomplete type ‘class vtkPolyData’ if (reader…

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## [Proper Exponents in Text](https://discourse.vtk.org/t/proper-exponents-in-text/1347)

<div class="topic-metadata">

**Author:** [@ChristopherWaters](https://discourse.vtk.org/u/ChristopherWaters)\
**Replies:** 0\
**Last updated:** [July 16, 2019, 7:03am UTC](https://discourse.vtk.org/t/proper-exponents-in-text/1347 "2019-07-16T07:03:13Z")

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Can’t figure out how to display exponents properly in a text actor/axis title (2D). Seems like a simple question but can’t find any answers, even checking documentation of text classes… Any help would be appreciated.

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## [vtkPlaneWidget vtkProbeFilter speed issue](https://discourse.vtk.org/t/vtkplanewidget-vtkprobefilter-speed-issue/1342)

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**Author:** [@Sean](https://discourse.vtk.org/u/Sean)\
**Replies:** 0\
**Last updated:** [July 15, 2019, 8:09pm UTC](https://discourse.vtk.org/t/vtkplanewidget-vtkprobefilter-speed-issue/1342 "2019-07-15T20:09:10Z")

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Hi, The following is the work flow I used to probe a dynamic vector data volume and it output the correct results. However, it is quite slow (lagging) through the rendering. If I delete the line 5 (planeWidget-\>GetPolyD…

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## [VTK Requested modules not available vtkIOFFMPEG](https://discourse.vtk.org/t/vtk-requested-modules-not-available-vtkioffmpeg/1335)

<div class="topic-metadata">

**Author:** [@aneeshikmat](https://discourse.vtk.org/u/aneeshikmat)\
**Replies:** 1\
**Last updated:** [July 15, 2019, 5:05pm UTC](https://discourse.vtk.org/t/vtk-requested-modules-not-available-vtkioffmpeg/1335 "2019-07-15T17:05:28Z")

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Im try to execute this example from VTK, and to do that I most install ffmpeg from this url and all is good, but when I try to build project I get this error: /Downloads/VTK-8.2.0/CMake/vtkModuleAPI.cmake:140 (message…

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## [Help on Mining Data](https://discourse.vtk.org/t/help-on-mining-data/1331)

<div class="topic-metadata">

**Author:** [@raoni.salomao](https://discourse.vtk.org/u/raoni.salomao)\
**Replies:** 0\
**Last updated:** [July 14, 2019, 1:04pm UTC](https://discourse.vtk.org/t/help-on-mining-data/1331 "2019-07-14T13:04:37Z")

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Hello! I’m new to VTK and started my learning recently. Due to the huge amount of knowledge available for VTK I need some help to guide my studies. I work in a mine and our goal is to draw litology and lab results. For…

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## [How to update adjacent vtkPolyData instances after a transformation](https://discourse.vtk.org/t/how-to-update-adjacent-vtkpolydata-instances-after-a-transformation/1325)

<div class="topic-metadata">

**Author:** [@mapsupport](https://discourse.vtk.org/u/mapsupport)\
**Replies:** 6\
**Last updated:** [July 12, 2019, 6:21pm UTC](https://discourse.vtk.org/t/how-to-update-adjacent-vtkpolydata-instances-after-a-transformation/1325 "2019-07-12T18:21:36Z")

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Hi VTK users, Initially I thought applying a transformation to one cell of a vtkPolyData would propagate positional changes to other vtkPolyData’s sharing the same points, but I am mistaken. In the example below there …

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## [Slice extraction of 3D data](https://discourse.vtk.org/t/slice-extraction-of-3d-data/1222)

<div class="topic-metadata">

**Author:** [@1111](https://discourse.vtk.org/u/1111)\
**Replies:** 0\
**Last updated:** [June 27, 2019, 9:25am UTC](https://discourse.vtk.org/t/slice-extraction-of-3d-data/1222 "2019-06-27T09:25:48Z")

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I am a VTK beginner. Currently, I was able to display the 3D data I have using SimpleRayCast. Next, I want to extract any slice (2D image) on that 3D. I want to extract slices on a line in 3D data displayed by SimpleR…

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## [\<?xml version="1.0" encoding="ISO-8859-1"?](https://discourse.vtk.org/t/xml-version-1-0-encoding-iso-8859-1/1304)

<div class="topic-metadata">

**Author:** [@Vaya\_Putra](https://discourse.vtk.org/u/Vaya_Putra)\
**Replies:** 5\
**Last updated:** [July 11, 2019, 6:58pm UTC](https://discourse.vtk.org/t/xml-version-1-0-encoding-iso-8859-1/1304 "2019-07-11T18:58:12Z")

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i got open source simulation, and how to write the output file used \<?xml version="1.0" encoding="ISO-8859-1"?\> i am facing that i can not read that output file write as below PointData DataArray type=“Float64” Na…

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## [Any python GPU computing api compatible with VTK objects?](https://discourse.vtk.org/t/any-python-gpu-computing-api-compatible-with-vtk-objects/1322)

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**Author:** [@szx0112](https://discourse.vtk.org/u/szx0112)\
**Replies:** 1\
**Last updated:** [July 11, 2019, 3:17pm UTC](https://discourse.vtk.org/t/any-python-gpu-computing-api-compatible-with-vtk-objects/1322 "2019-07-11T15:17:48Z")

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For example, I have a dense point cloud (100,000 ~ 1000,000 pts), I want to check the intersection with a single outside point. I use the obbTree.IntersectWithLine to loop through all the point in the point cloud while i…

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## [Problem with view update since Intel UHD Graphics 620 driver update](https://discourse.vtk.org/t/problem-with-view-update-since-intel-uhd-graphics-620-driver-update/1224)

<div class="topic-metadata">

**Author:** [@SFischer](https://discourse.vtk.org/u/SFischer)\
**Replies:** 4\
**Last updated:** [July 11, 2019, 6:45am UTC](https://discourse.vtk.org/t/problem-with-view-update-since-intel-uhd-graphics-620-driver-update/1224 "2019-07-11T06:45:18Z")

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Since the update of the intel graphics driver this morning (to driver version 26.20.100.6859) the background color is no more applied to my VTK View and when moving the camera the old shapes are not removed. View with i…

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## [Building a library which depends on VTK: Headers not found.](https://discourse.vtk.org/t/building-a-library-which-depends-on-vtk-headers-not-found/1298)

<div class="topic-metadata">

**Author:** [@sudomakeinstall](https://discourse.vtk.org/u/sudomakeinstall)\
**Replies:** 8\
**Last updated:** [July 10, 2019, 11:23pm UTC](https://discourse.vtk.org/t/building-a-library-which-depends-on-vtk-headers-not-found/1298 "2019-07-10T23:23:09Z")

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All– I’m trying to build a library which depends upon VTK, but am having trouble getting it to find the header files. I’ve put together a minimal example to show the error: $ make Scanning dependencies of target dv-ut…

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## [bug in vtkcutter. It does not return cells only points](https://discourse.vtk.org/t/bug-in-vtkcutter-it-does-not-return-cells-only-points/1309)

<div class="topic-metadata">

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 3\
**Last updated:** [July 10, 2019, 8:04am UTC](https://discourse.vtk.org/t/bug-in-vtkcutter-it-does-not-return-cells-only-points/1309 "2019-07-10T08:04:20Z")

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Dear all, I have detected a bug in vtkcutter, i want to get the intersection between a plane and an stl and instead of getting edges what i get is points. If i print the cells returns 0, so i can´t use vtkstripper as it…

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## [ImageSlicing operation error](https://discourse.vtk.org/t/imageslicing-operation-error/1276)

<div class="topic-metadata">

**Author:** [@1111](https://discourse.vtk.org/u/1111)\
**Replies:** 4\
**Last updated:** [July 9, 2019, 2:09am UTC](https://discourse.vtk.org/t/imageslicing-operation-error/1276 "2019-07-09T02:09:53Z")

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I have run the ImageSlicing sample. However, the following error was displayed. I understand that it is a vtkImageReader2 error, but I don’t know how to cope. please tell me.

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## [VTK 8.2 Build Fails During External Data File Download](https://discourse.vtk.org/t/vtk-8-2-build-fails-during-external-data-file-download/1275)

<div class="topic-metadata">

**Author:** [@Rogermc](https://discourse.vtk.org/u/Rogermc)\
**Replies:** 2\
**Last updated:** [July 8, 2019, 10:47am UTC](https://discourse.vtk.org/t/vtk-8-2-build-fails-during-external-data-file-download/1275 "2019-07-08T10:47:11Z")

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Mac Mini OSX 10.14.5 XCode 10.2.1 My Xcode build of git cloned https://gitlab.kitware.com/vtk/vtk fails at: Generating /Applications\_Packages/VTK/vtk-build/ExternalData/Testing/Data/MotionFX/2\_gears/Big\_Gear\_scale.s…

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## [VTK in appveyor](https://discourse.vtk.org/t/vtk-in-appveyor/1293)

<div class="topic-metadata">

**Author:** [@Ron84](https://discourse.vtk.org/u/Ron84)\
**Replies:** 1\
**Last updated:** [July 8, 2019, 10:43am UTC](https://discourse.vtk.org/t/vtk-in-appveyor/1293 "2019-07-08T10:43:54Z")

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I want to use VTK7 in appveyor. I don’t want to build VTK from source, because it takes long time. Are there binaries for Visual Studio 2015 or 2017?

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## [how to use vtk import obj file which contains multiple objects?](https://discourse.vtk.org/t/how-to-use-vtk-import-obj-file-which-contains-multiple-objects/1296)

<div class="topic-metadata">

**Author:** [@Wenye\_He](https://discourse.vtk.org/u/Wenye_He)\
**Replies:** 3\
**Last updated:** [July 8, 2019, 12:42am UTC](https://discourse.vtk.org/t/how-to-use-vtk-import-obj-file-which-contains-multiple-objects/1296 "2019-07-08T00:42:27Z")

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I am using vtkobjreader to import obj and show them in my viewer. One obj file may contain more than one object. How to import the obj file and create multiple objects?

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## [apply filter multiple times](https://discourse.vtk.org/t/apply-filter-multiple-times/1300)

<div class="topic-metadata">

**Author:** [@martin.genet](https://discourse.vtk.org/u/martin.genet)\
**Replies:** 0\
**Last updated:** [July 7, 2019, 1:16pm UTC](https://discourse.vtk.org/t/apply-filter-multiple-times/1300 "2019-07-07T13:16:48Z")

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Dear all: I am having some issue setting up a rather complex pipeline involving, but not exclusively, vtk objects and filters. I think basically the issue boils down to this: I create an unstructured grid with some vect…

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## [How to preserve array data with vtkClipPolyData?](https://discourse.vtk.org/t/how-to-preserve-array-data-with-vtkclippolydata/1271)

<div class="topic-metadata">

**Author:** [@normanius](https://discourse.vtk.org/u/normanius)\
**Replies:** 3\
**Last updated:** [July 7, 2019, 11:21am UTC](https://discourse.vtk.org/t/how-to-preserve-array-data-with-vtkclippolydata/1271 "2019-07-07T11:21:48Z")

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I’m using vtkClipPolyData to clip a vtkPolyData object. Is it possible to preserve the array data stored in the source object? I noticed that after clipping, the output does not contain any point- or cell-data. If it’s …

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## [Is it possible to turn off triangles on vtkClipDataSet filter?](https://discourse.vtk.org/t/is-it-possible-to-turn-off-triangles-on-vtkclipdataset-filter/279)

<div class="topic-metadata">

**Author:** [@banesullivan](https://discourse.vtk.org/u/banesullivan)\
**Replies:** 25\
**Last updated:** [July 6, 2019, 7:41pm UTC](https://discourse.vtk.org/t/is-it-possible-to-turn-off-triangles-on-vtkclipdataset-filter/279 "2019-07-06T19:41:37Z")

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Is it possible to turn off triangles when clipping a dataset via the vtk.vtkClipDataSet filter? The slicing filter (vtk.vtkCutter) has an awesome GenerateTrianglesOff() method… is there an equivalent for the clip filter? …

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## [VTU file error visualize on paraview](https://discourse.vtk.org/t/vtu-file-error-visualize-on-paraview/1253)

<div class="topic-metadata">

**Author:** [@Vaya\_Putra](https://discourse.vtk.org/u/Vaya_Putra)\
**Replies:** 3\
**Last updated:** [July 6, 2019, 2:30am UTC](https://discourse.vtk.org/t/vtu-file-error-visualize-on-paraview/1253 "2019-07-06T02:30:50Z")

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hi i create new file VTU file, but i can not visualize in paraview got some error Error parsing XML in stream at line 158, column 2, byte index 2505: mismatched tag Error parsing input file. ReadXMLInformation abort…

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## [CT opacity gradient piecewise function](https://discourse.vtk.org/t/ct-opacity-gradient-piecewise-function/1274)

<div class="topic-metadata">

**Author:** [@socd06](https://discourse.vtk.org/u/socd06)\
**Replies:** 4\
**Last updated:** [July 5, 2019, 3:25pm UTC](https://discourse.vtk.org/t/ct-opacity-gradient-piecewise-function/1274 "2019-07-05T15:25:05Z")

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Hi, I’m going through examples from the textbook and user guide and I recently started working on https://lorensen.github.io/VTKExamples/site/Cxx/Medical/MedicalDemo4/ To volume render DICOM CT data. I can’t figure out…

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## [Remove collinear points from polyline](https://discourse.vtk.org/t/remove-collinear-points-from-polyline/1282)

<div class="topic-metadata">

**Author:** [@lplavorante](https://discourse.vtk.org/u/lplavorante)\
**Replies:** 0\
**Last updated:** [July 5, 2019, 1:04pm UTC](https://discourse.vtk.org/t/remove-collinear-points-from-polyline/1282 "2019-07-05T13:04:46Z")

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Greetings! Does VTK provide a filter to remove collinear points from a polyline (stored as vtkPolyData)? Basically, my polylines contain contiguous collinear segments and I need to replace each such group with a single …

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## [Plot Individual Values for Each Cell](https://discourse.vtk.org/t/plot-individual-values-for-each-cell/1277)

<div class="topic-metadata">

**Author:** [@akaszynski](https://discourse.vtk.org/u/akaszynski)\
**Replies:** 0\
**Last updated:** [July 5, 2019, 8:13am UTC](https://discourse.vtk.org/t/plot-individual-values-for-each-cell/1277 "2019-07-05T08:13:35Z")

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I’d like to plot scalars that are individual for each cell and each point. To clarify, the number of scalars matches the (npoints\*ncells). Since this doesn’t match the number of cells or the number of points, you can’t…

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