# Latest

**URL:** https://discourse.vtk.org/latest.md?page=134

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

**Page:** 135

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## [DLL load failure when importing vtkFiltersExtraction](https://discourse.vtk.org/t/dll-load-failure-when-importing-vtkfiltersextraction/8343)

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**Author:** [@JayEspi](https://discourse.vtk.org/u/JayEspi)\
**Replies:** 1\
**Last updated:** [April 20, 2022, 8:31pm UTC](https://discourse.vtk.org/t/dll-load-failure-when-importing-vtkfiltersextraction/8343 "2022-04-20T20:31:08Z")

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Setup: Windows 10, Anaconda, Python v3.9 When I try to import vtkFiltersExtraction: import vtkmodules.vtkFiltersExtraction I get this error: ImportError: DLL load failed while importing vtkFiltersExtraction: The spec…

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## [Multiple Users + Python Launcher + VTK + MPI](https://discourse.vtk.org/t/multiple-users-python-launcher-vtk-mpi/8318)

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**Author:** [@joaomlap](https://discourse.vtk.org/u/joaomlap)\
**Replies:** 3\
**Last updated:** [April 20, 2022, 5:29pm UTC](https://discourse.vtk.org/t/multiple-users-python-launcher-vtk-mpi/8318 "2022-04-20T17:29:44Z")

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Hi, Currently I have: a frontend client served from Apache a Python Launcher configured to start a server application my VTK server Same setup described here: ParaViewWeb My question: I would like my server to be a…

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## [How to switch InteractorStyleTrackballCamera interactor style pan handler events from left mouse to right mouse?](https://discourse.vtk.org/t/how-to-switch-interactorstyletrackballcamera-interactor-style-pan-handler-events-from-left-mouse-to-right-mouse/8324)

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**Author:** [@Yuvi-416](https://discourse.vtk.org/u/Yuvi-416)\
**Replies:** 4\
**Last updated:** [April 20, 2022, 3:27pm UTC](https://discourse.vtk.org/t/how-to-switch-interactorstyletrackballcamera-interactor-style-pan-handler-events-from-left-mouse-to-right-mouse/8324 "2022-04-20T15:27:28Z")

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Hi all, I found that below events can be used to to control the view of the render image, but is there a way to block some events or to switch the event for example Left Mouse + Shift: Pan events to right mouse and also…

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## [vtkDataSetSurfaceFilter](https://discourse.vtk.org/t/vtkdatasetsurfacefilter/8336)

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**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\
**Replies:** 3\
**Last updated:** [April 20, 2022, 3:24pm UTC](https://discourse.vtk.org/t/vtkdatasetsurfacefilter/8336 "2022-04-20T15:24:27Z")

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@will.schroeder The vtkDataSetSurfaceFilter may delegate its processing to an internal vtkGeometryFilter which has been parallelized and now may be much faster. The delegation is switched off by default though, because …

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## [MFIX 21.4 see fault on VTK via ssh -XY and Xquartz 2.8.1/Mac; vtkOpenGLRenderWindow.c/vtkXOpenGLRenderWindow errors](https://discourse.vtk.org/t/mfix-21-4-see-fault-on-vtk-via-ssh-xy-and-xquartz-2-8-1-mac-vtkopenglrenderwindow-c-vtkxopenglrenderwindow-errors/8313)

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**Author:** [@RobbieTheK](https://discourse.vtk.org/u/RobbieTheK)\
**Replies:** 6\
**Last updated:** [April 20, 2022, 1:52pm UTC](https://discourse.vtk.org/t/mfix-21-4-see-fault-on-vtk-via-ssh-xy-and-xquartz-2-8-1-mac-vtkopenglrenderwindow-c-vtkxopenglrenderwindow-errors/8313 "2022-04-20T13:52:35Z")

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Using XQuartz 2.8.1 on macOs 12.3.1 Monterey, and setting defaults write org.xquartz.X11 enable\_iglx -bool true MFIX crashes at the VTK loading part. Works fine on Windows, e.g., with Mobaxterm. We use RHEL 7 and X-forwa…

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## [vtkMarkBoundaryFilter](https://discourse.vtk.org/t/vtkmarkboundaryfilter/8335)

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**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\
**Replies:** 0\
**Last updated:** [April 20, 2022, 11:17am UTC](https://discourse.vtk.org/t/vtkmarkboundaryfilter/8335 "2022-04-20T11:17:12Z")

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In my FEA application I need to compute the (still unstructured, i.e. possibly non-linear) surface of unstructured grids and this often is time consuming. I was looking for whether vtkUnstructuredGridGeometryFilter was S…

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## [how to build the example using webpack](https://discourse.vtk.org/t/how-to-build-the-example-using-webpack/8328)

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**Author:** [@xiaoerlaigeid](https://discourse.vtk.org/u/xiaoerlaigeid)\
**Replies:** 1\
**Last updated:** [April 20, 2022, 12:04pm UTC](https://discourse.vtk.org/t/how-to-build-the-example-using-webpack/8328 "2022-04-20T12:04:24Z")

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hello, I am new here to study vtk.js. I have been using vtk CPP for a long time but I am not familiar with js. I wonder how to build the vtk.js example. I try to build but I was stuck in the version dependency(especially…

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## [how to make sure the result of vtkMarchCube or vtkFlyingEdge3D is closed one, which has no boundary edges and non-manifold edges](https://discourse.vtk.org/t/how-to-make-sure-the-result-of-vtkmarchcube-or-vtkflyingedge3d-is-closed-one-which-has-no-boundary-edges-and-non-manifold-edges/8334)

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**Author:** [@xianger.qi](https://discourse.vtk.org/u/xianger.qi)\
**Replies:** 4\
**Last updated:** [April 20, 2022, 11:53am UTC](https://discourse.vtk.org/t/how-to-make-sure-the-result-of-vtkmarchcube-or-vtkflyingedge3d-is-closed-one-which-has-no-boundary-edges-and-non-manifold-edges/8334 "2022-04-20T11:53:03Z")

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Hi Gays: operations below, how could i make sure the result of these operations is a closed mesh, which has no boundary edges and non-manifold edges. OPERATIONS: step 1: create a closed surface A, which has no boundar…

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## [alias target](https://discourse.vtk.org/t/alias-target/8322)

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**Author:** [@djduke](https://discourse.vtk.org/u/djduke)\
**Replies:** 3\
**Last updated:** [April 19, 2022, 6:42pm UTC](https://discourse.vtk.org/t/alias-target/8322 "2022-04-19T18:42:48Z")

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I’m getting a cmake error on my module target\_link\_libraries can not be used on an ALIAS target. I’ve gone through the online cmake tutorial, think I understand aliases but cannot see why my command is being interpre…

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## [Set vtkScalarBarActor ticks](https://discourse.vtk.org/t/set-vtkscalarbaractor-ticks/8311)

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**Author:** [@Nicolas\_Schmidt](https://discourse.vtk.org/u/Nicolas_Schmidt)\
**Replies:** 5\
**Last updated:** [April 19, 2022, 6:20pm UTC](https://discourse.vtk.org/t/set-vtkscalarbaractor-ticks/8311 "2022-04-19T18:20:52Z")

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I’d like to be able to set the ticks for a scalar bar actor so that the min / max values on the scale always show as in the image below: I see that model.ticks is set statically here: const scale = d3 …

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## [Sandia's 4th Annual XR Conference](https://discourse.vtk.org/t/sandias-4th-annual-xr-conference/8323)

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**Author:** [@cory.quammen](https://discourse.vtk.org/u/cory.quammen)\
**Replies:** 0\
**Last updated:** [April 19, 2022, 3:53pm UTC](https://discourse.vtk.org/t/sandias-4th-annual-xr-conference/8323 "2022-04-19T15:53:11Z")

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Sandia’s 4th Annual XR Conference Augmented, Virtual, and Mixed Reality JULY 12-14 • hosted virtually • Open and Free to All Expecting keynotes from Unity, Nvidia, and others The conference will be nothing witho…

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## [Accessing the vtkVolumeController color map](https://discourse.vtk.org/t/accessing-the-vtkvolumecontroller-color-map/8316)

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**Author:** [@ksmith](https://discourse.vtk.org/u/ksmith)\
**Replies:** 5\
**Last updated:** [April 19, 2022, 3:39pm UTC](https://discourse.vtk.org/t/accessing-the-vtkvolumecontroller-color-map/8316 "2022-04-19T15:39:36Z")

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I’m using vtk.js in a React application. I would like to control the color map natively; i.e. have a custom dropdown with color map options then pass those to the vtkVolumeController when I call the setupContent method …

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## [How to install vtk v9.1.0 in Windows 10 Anaconda v3.9 without Internet connection?](https://discourse.vtk.org/t/how-to-install-vtk-v9-1-0-in-windows-10-anaconda-v3-9-without-internet-connection/8321)

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**Author:** [@JayEspi](https://discourse.vtk.org/u/JayEspi)\
**Replies:** 0\
**Last updated:** [April 19, 2022, 2:55pm UTC](https://discourse.vtk.org/t/how-to-install-vtk-v9-1-0-in-windows-10-anaconda-v3-9-without-internet-connection/8321 "2022-04-19T14:55:05Z")

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Setup: Windows 10 box without Internet connection, Anaconda v3.9 I cannot successfully install Anaconda VTK file vtk-9.1.0-qt-py39h1ab545e\_206.tar.bz2. “conda install …” will put \*.pyd files in site packages folder and …

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## [Show vtkDebugMacro in console using python](https://discourse.vtk.org/t/show-vtkdebugmacro-in-console-using-python/8319)

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**Author:** [@syj](https://discourse.vtk.org/u/syj)\
**Replies:** 0\
**Last updated:** [April 19, 2022, 12:34pm UTC](https://discourse.vtk.org/t/show-vtkdebugmacro-in-console-using-python/8319 "2022-04-19T12:34:28Z")

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Hi guys, I wonder if it is possible to show the vtkDebugMacro text in console, when using python? reader=vtk.vtkDICOMImageReader() reader.DebugOn() I use the code above, but no debug text shows in console except error…

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## [SetMultiSamples + Transparency = weird display](https://discourse.vtk.org/t/setmultisamples-transparency-weird-display/8308)

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**Author:** [@Olivier](https://discourse.vtk.org/u/Olivier)\
**Replies:** 2\
**Last updated:** [April 18, 2022, 2:16pm UTC](https://discourse.vtk.org/t/setmultisamples-transparency-weird-display/8308 "2022-04-18T14:16:06Z")

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Hi friends, I’m displaying a 2D ortho scene with a bunch of very simple polygons. There are 3 “layers” of polygons, offseted on the Z axis to have a proper render. On layer #1 (Z = 0.00), I have Polydatas with plain o…

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## [Boolean Operation PolyData Filter says no intersection in a plane and a sphere](https://discourse.vtk.org/t/boolean-operation-polydata-filter-says-no-intersection-in-a-plane-and-a-sphere/8310)

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**Author:** [@tonghao\_Yuan](https://discourse.vtk.org/u/tonghao_Yuan)\
**Replies:** 0\
**Last updated:** [April 18, 2022, 12:58pm UTC](https://discourse.vtk.org/t/boolean-operation-polydata-filter-says-no-intersection-in-a-plane-and-a-sphere/8310 "2022-04-18T12:58:21Z")

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I want to make an intersection with a plane and a sphere with vtkBooleanOperationPolyDataFilter, but the result is no intersection. Could anyone explain to me why? the code is here: #include \<vtkActor.h\> #include \<vtk…

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## [How to ReplaceCell to a vtkEmptyCell in vtkUnstructuredGrid ?](https://discourse.vtk.org/t/how-to-replacecell-to-a-vtkemptycell-in-vtkunstructuredgrid/8303)

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**Author:** [@Jacques.chen](https://discourse.vtk.org/u/Jacques.chen)\
**Replies:** 2\
**Last updated:** [April 18, 2022, 1:29am UTC](https://discourse.vtk.org/t/how-to-replacecell-to-a-vtkemptycell-in-vtkunstructuredgrid/8303 "2022-04-18T01:29:44Z")

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I use vtkUnstructuredGrid to store cell dates , and I want replace a cell to a vtkEmptyCell . But fail.

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## [Advises for installing VTK Web application](https://discourse.vtk.org/t/advises-for-installing-vtk-web-application/8096)

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**Author:** [@BotellaA](https://discourse.vtk.org/u/BotellaA)\
**Replies:** 9\
**Last updated:** [April 15, 2022, 10:54pm UTC](https://discourse.vtk.org/t/advises-for-installing-vtk-web-application/8096 "2022-04-15T22:54:23Z")

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I have a VTK Web application and I was wondering the best way to install the vtk web requirements. I am looking at Docker and/or pip solutions. For Docker, it does not seem to have vtk web docker anymore, only Paraview …

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## [Reading ply data over SetInputString](https://discourse.vtk.org/t/reading-ply-data-over-setinputstring/8305)

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**Author:** [@csad6517](https://discourse.vtk.org/u/csad6517)\
**Replies:** 0\
**Last updated:** [April 15, 2022, 3:24pm UTC](https://discourse.vtk.org/t/reading-ply-data-over-setinputstring/8305 "2022-04-15T15:24:50Z")

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I am trying to stream a ply file instead of reading it from a file using SetInputString(). The data is a binary string, which looks like: ply format binary\_little\_endian 1.0 comment VTK generated PLY File comment SPACE=…

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## [Change the cursor style in RenderWindow](https://discourse.vtk.org/t/change-the-cursor-style-in-renderwindow/8304)

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**Author:** [@peeling](https://discourse.vtk.org/u/peeling)\
**Replies:** 1\
**Last updated:** [April 15, 2022, 2:29pm UTC](https://discourse.vtk.org/t/change-the-cursor-style-in-renderwindow/8304 "2022-04-15T14:29:47Z")

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Hey, I’m using cellPicker to pick a point on a brain geometry, like in the example from vtk.js website CellPicker, As I’m using it on a brain geometry with a lot of triangles, the picking process takes time (2 seconds)…

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## [Customize ImplicitPlaneWidget](https://discourse.vtk.org/t/customize-implicitplanewidget/8302)

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**Author:** [@Nicolas\_Schmidt](https://discourse.vtk.org/u/Nicolas_Schmidt)\
**Replies:** 0\
**Last updated:** [April 14, 2022, 8:55pm UTC](https://discourse.vtk.org/t/customize-implicitplanewidget/8302 "2022-04-14T20:55:16Z")

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I’d like to customize the actor properties of my ImplicitPlaneWidget but functions like setNormalVisible() don’t seem to be exposed via vtk.js. I see the following lines in the vtkImplicitPlaneWidget code: model.metho…

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## [Xdmf2 Missing Header ?](https://discourse.vtk.org/t/xdmf2-missing-header/8300)

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**Author:** [@Kostas\_Politis](https://discourse.vtk.org/u/Kostas_Politis)\
**Replies:** 1\
**Last updated:** [April 14, 2022, 7:28pm UTC](https://discourse.vtk.org/t/xdmf2-missing-header/8300 "2022-04-14T19:28:18Z")

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Hello all, The header “XdmfExport.h” is missing from the include subdirectory of VTK’s installation (vtkxdmf2/libsrc - I actually noticed that by chance in PV). The header is used by XdmfH5Driver.h and XdmfObject.h. As…

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## [Mapping n-dimensional data arrays to vertex attributes](https://discourse.vtk.org/t/mapping-n-dimensional-data-arrays-to-vertex-attributes/8301)

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**Author:** [@guaje](https://discourse.vtk.org/u/guaje)\
**Replies:** 0\
**Last updated:** [April 14, 2022, 6:12pm UTC](https://discourse.vtk.org/t/mapping-n-dimensional-data-arrays-to-vertex-attributes/8301 "2022-04-14T18:12:30Z")

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Hello, I’m trying to map n-dimensional per-point data to per-vertex data using the MapDataArrayToVertexAttribute function. In the past, I have succeeded in mapping integers, floats, and vec3/4 using this function and t…

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## [Why doesn't VTK\_SMP\_IMPLEMENTATION\_TYPE default to STDThread?](https://discourse.vtk.org/t/why-doesnt-vtk-smp-implementation-type-default-to-stdthread/8293)

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**Author:** [@seanm](https://discourse.vtk.org/u/seanm)\
**Replies:** 7\
**Last updated:** [April 14, 2022, 5:00pm UTC](https://discourse.vtk.org/t/why-doesnt-vtk-smp-implementation-type-default-to-stdthread/8293 "2022-04-14T17:00:06Z")

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Hi all, Why does VTK\_SMP\_IMPLEMENTATION\_TYPE default to Sequential instead of STDThread? Are there platforms where STDThread doesn’t exist/work? Cheers, Sean

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## [Overlaying Segmented mask with color over Input Vtkimagedata 3D (Dicom series)](https://discourse.vtk.org/t/overlaying-segmented-mask-with-color-over-input-vtkimagedata-3d-dicom-series/8299)

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**Author:** [@Sreerag](https://discourse.vtk.org/u/Sreerag)\
**Replies:** 0\
**Last updated:** [April 14, 2022, 9:33am UTC](https://discourse.vtk.org/t/overlaying-segmented-mask-with-color-over-input-vtkimagedata-3d-dicom-series/8299 "2022-04-14T09:33:38Z")

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Hi all , I am working with ITK Segmentation algorithm’s. My input is a Dicom series and I used VtkDicomReader to get the vtkimagedata and then I converted to itkimage(Short, dmension=3) and I used connected threshold re…

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## [QVTKWidget is in vtk no longer supported?](https://discourse.vtk.org/t/qvtkwidget-is-in-vtk-no-longer-supported/4022)

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**Author:** [@Amnesie](https://discourse.vtk.org/u/Amnesie)\
**Replies:** 5\
**Last updated:** [April 14, 2022, 7:36am UTC](https://discourse.vtk.org/t/qvtkwidget-is-in-vtk-no-longer-supported/4022 "2022-04-14T07:36:01Z")

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I configured the vtk environment for my new computer today, so I downloaded the latest vtk version and I found that the code (base on 8.1) wrote before doesn’t work, it shows : qvtkwidget.h no such file or directory A…

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## [NaN support](https://discourse.vtk.org/t/nan-support/8287)

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**Author:** [@lassoan](https://discourse.vtk.org/u/lassoan)\
**Replies:** 5\
**Last updated:** [April 14, 2022, 7:20am UTC](https://discourse.vtk.org/t/nan-support/8287 "2022-04-14T07:20:26Z")

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Using NaN values came up in another topic, which shows that there are people in the VTK community who assume it is OK to use NaN values, while I would assume that having NaN values may lead to problems and should be avoi…

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## [Unable to Load big VTI files in VTK.JS](https://discourse.vtk.org/t/unable-to-load-big-vti-files-in-vtk-js/7888)

<div class="topic-metadata">

**Author:** [@simplyvish](https://discourse.vtk.org/u/simplyvish)\
**Replies:** 14\
**Last updated:** [April 14, 2022, 4:51am UTC](https://discourse.vtk.org/t/unable-to-load-big-vti-files-in-vtk-js/7888 "2022-04-14T04:51:00Z")

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Hi, I’m trying to load VTI files with size around 700MB. The error screenshot is attached for reference. The loading is tried with online VolumeViewer example (https://kitware.github.io/vtk-js/examples/VolumeViewer/Volum…

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## [When using QQuickVTKRenderItem, removing the render produces a memory leak](https://discourse.vtk.org/t/when-using-qquickvtkrenderitem-removing-the-render-produces-a-memory-leak/8296)

<div class="topic-metadata">

**Author:** [@WangZP10969](https://discourse.vtk.org/u/WangZP10969)\
**Replies:** 0\
**Last updated:** [April 14, 2022, 3:24am UTC](https://discourse.vtk.org/t/when-using-qquickvtkrenderitem-removing-the-render-produces-a-memory-leak/8296 "2022-04-14T03:24:16Z")

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I recently tested the use of QtQuick(QT5.15) with VTK9.1. I checked the routines, and it can be displayed normally based on QQuickVTKRenderItem, but I am confused about how to safely clear the display of the window When…

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## [how to read file in .raw format?](https://discourse.vtk.org/t/how-to-read-file-in-raw-format/8228)

<div class="topic-metadata">

**Author:** [@zhangzhi93](https://discourse.vtk.org/u/zhangzhi93)\
**Replies:** 6\
**Last updated:** [April 14, 2022, 12:59am UTC](https://discourse.vtk.org/t/how-to-read-file-in-raw-format/8228 "2022-04-14T00:59:19Z")

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I find the vtkImageReader in c++,but not have same api in vtk.js. when i use vtkXMLImageDataReader, parseAsArrayBuffer(bufferarray) throw a error,like this:

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