# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=36

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

**Page:** 37

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## [Questions about the vtkOSPRayVolumeMapper](https://discourse.vtk.org/t/questions-about-the-vtkosprayvolumemapper/12672)

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**Author:** [@tong\_yang](https://discourse.vtk.org/u/tong_yang)\
**Replies:** 2\
**Last updated:** [November 27, 2023, 10:52pm UTC](https://discourse.vtk.org/t/questions-about-the-vtkosprayvolumemapper/12672 "2023-11-27T22:52:34Z")

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Hello, I have a question about the vtkOSPRayVolumeMapper. I would like to know whether the vtkVolumeMapper::MAXIMUM\_INTENSITY\_BLEND is supported. ​If the mapper does not support this blend mode, I should know how to ma…

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## [missing vtkImageRenderManager and other headers](https://discourse.vtk.org/t/missing-vtkimagerendermanager-and-other-headers/12792)

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**Author:** [@realwhzc](https://discourse.vtk.org/u/realwhzc)\
**Replies:** 2\
**Last updated:** [November 27, 2023, 12:51pm UTC](https://discourse.vtk.org/t/missing-vtkimagerendermanager-and-other-headers/12792 "2023-11-27T12:51:14Z")

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There is a folder(Rendering/Parallel) in the source code, but it doesn’t seem to have been compiled. How can I make the compiled result contain the headers in this folder？

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## [Building an annotation software using VTK's interactor - issue with coordinate skipping](https://discourse.vtk.org/t/building-an-annotation-software-using-vtks-interactor-issue-with-coordinate-skipping/12794)

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**Author:** [@zemmyang](https://discourse.vtk.org/u/zemmyang)\
**Replies:** 0\
**Last updated:** [November 27, 2023, 10:50am UTC](https://discourse.vtk.org/t/building-an-annotation-software-using-vtks-interactor-issue-with-coordinate-skipping/12794 "2023-11-27T10:50:36Z")

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Here’s what I’m talking about: The third one is potentially very problematic - what I do after the points have been dragged is to connect the coordinates and use that to create a region of interest. If the coordinates…

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## [Extract Points in vtkPolyData based on Distance](https://discourse.vtk.org/t/extract-points-in-vtkpolydata-based-on-distance/12789)

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**Author:** [@MaxMRichter](https://discourse.vtk.org/u/MaxMRichter)\
**Replies:** 2\
**Last updated:** [November 27, 2023, 9:20am UTC](https://discourse.vtk.org/t/extract-points-in-vtkpolydata-based-on-distance/12789 "2023-11-27T09:20:57Z")

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Hey Folks! I am trying to make a visualization of surfaces in 3D. These surfaces are defined by moving lines in time. which are extracted numerically. The problem i have is not creating a surface from the extracted line…

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## [How to use vtkRenderWindowInteractor in QVTKOpenGLNativeWidget](https://discourse.vtk.org/t/how-to-use-vtkrenderwindowinteractor-in-qvtkopenglnativewidget/2499)

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**Author:** [@yuhuimoon](https://discourse.vtk.org/u/yuhuimoon)\
**Replies:** 4\
**Last updated:** [November 27, 2023, 4:23am UTC](https://discourse.vtk.org/t/how-to-use-vtkrenderwindowinteractor-in-qvtkopenglnativewidget/2499 "2023-11-27T04:23:02Z")

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I want to use vtkOrientationMarkerWidget(named “widget”) in my viewer widget which is derived from QVTKOpenGLNativeWidget. I try to call widget-\>SetCurrentRenderer(m\_render). But widget can not display in my viewer. And …

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## [How to use vtk to check if a discrete GPU existed?](https://discourse.vtk.org/t/how-to-use-vtk-to-check-if-a-discrete-gpu-existed/10977)

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**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 7\
**Last updated:** [November 27, 2023, 1:06am UTC](https://discourse.vtk.org/t/how-to-use-vtk-to-check-if-a-discrete-gpu-existed/10977 "2023-11-27T01:06:03Z")

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Hello,ChatGPT gives me this: #include \<iostream\> #include \<vtkRenderWindow.h\> bool isDiscreteGPUExist() { vtkSmartPointer\<vtkRenderWindow\> window = vtkSmartPointer\<vtkRenderWindow\>::New(); window-\>OffScreenRend…

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## [After converting imagedata to polydata, how to make their coordinate systems consistent?](https://discourse.vtk.org/t/after-converting-imagedata-to-polydata-how-to-make-their-coordinate-systems-consistent/12783)

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**Author:** [@aebopi1999](https://discourse.vtk.org/u/aebopi1999)\
**Replies:** 7\
**Last updated:** [November 24, 2023, 1:42am UTC](https://discourse.vtk.org/t/after-converting-imagedata-to-polydata-how-to-make-their-coordinate-systems-consistent/12783 "2023-11-24T01:42:47Z")

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I use the following code to read the binary labelmap and convert it to polydata, in which I use vtkTransformPolyDataFilter to set the polydata’s transform, hoping to make the coordinate systems of the polydata and the in…

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## [Gizmo or any other alternative to bbox widget to rotate a polydata](https://discourse.vtk.org/t/gizmo-or-any-other-alternative-to-bbox-widget-to-rotate-a-polydata/5132)

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**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 5\
**Last updated:** [November 23, 2023, 1:06pm UTC](https://discourse.vtk.org/t/gizmo-or-any-other-alternative-to-bbox-widget-to-rotate-a-polydata/5132 "2023-11-23T13:06:39Z")

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Hi everybody, I wonder if there is any library for gizmo I can integrate with vtk for rendering. Any recommendation?. Or a similar widget for rotation to replace the bounding box widget where the rotation is very diff…

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## [Trame performance with many actors or a large structured grid](https://discourse.vtk.org/t/trame-performance-with-many-actors-or-a-large-structured-grid/12773)

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**Author:** [@aschheim](https://discourse.vtk.org/u/aschheim)\
**Replies:** 2\
**Last updated:** [November 23, 2023, 8:11am UTC](https://discourse.vtk.org/t/trame-performance-with-many-actors-or-a-large-structured-grid/12773 "2023-11-23T08:11:36Z")

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Hello, based on the cone example from the tutorial, the following code works well for the values of the size of the grid of cones, and of the structured grid, but if the number of actors (one per cone) is multiplied by 2…

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## [How to create a PlotSurface without filled the contour and select then number of levels](https://discourse.vtk.org/t/how-to-create-a-plotsurface-without-filled-the-contour-and-select-then-number-of-levels/12780)

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**Author:** [@pmartin](https://discourse.vtk.org/u/pmartin)\
**Replies:** 0\
**Last updated:** [November 22, 2023, 6:05pm UTC](https://discourse.vtk.org/t/how-to-create-a-plotsurface-without-filled-the-contour-and-select-then-number-of-levels/12780 "2023-11-22T18:05:49Z")

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In matploltib there are two ways to draw contour lines without filling and by filling (contour and contourf) But in vtk there is only the PlotContour option and I have managed to draw the contour filled in 3d but f…

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## [MultiVolume Rendering with VTKOpenglGPURaycastiongmapper : rendering failed problem](https://discourse.vtk.org/t/multivolume-rendering-with-vtkopenglgpuraycastiongmapper-rendering-failed-problem/12776)

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**Author:** [@JamesHOE](https://discourse.vtk.org/u/JamesHOE)\
**Replies:** 0\
**Last updated:** [November 22, 2023, 2:07pm UTC](https://discourse.vtk.org/t/multivolume-rendering-with-vtkopenglgpuraycastiongmapper-rendering-failed-problem/12776 "2023-11-22T14:07:29Z")

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I’m trying to use vtkMultivolume with vtkOpenglGPUVolumeRayCastMapper in VTK 9.3 in C++ When the blending mode of vtkOpenglGPUVolumeRayCastMapper is set to SetBlendModeToIsoSurface it works very well but the rendering d…

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## [when use surfaceFilter to filter the surface, sometime globalIds is nullptr, and sometime globalIds is not nullptr](https://discourse.vtk.org/t/when-use-surfacefilter-to-filter-the-surface-sometime-globalids-is-nullptr-and-sometime-globalids-is-not-nullptr/12731)

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**Author:** [@SkyFishers](https://discourse.vtk.org/u/SkyFishers)\
**Replies:** 3\
**Last updated:** [November 22, 2023, 1:53pm UTC](https://discourse.vtk.org/t/when-use-surfacefilter-to-filter-the-surface-sometime-globalids-is-nullptr-and-sometime-globalids-is-not-nullptr/12731 "2023-11-22T13:53:10Z")

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grid is one vtkUnstructuredGrid,when use surfaceFilter to filter the surface, after do that,for different grid,some globalIds is nullptr, and sometime globalIds is not nullptr; why? (vtk Version is 9.2) //grid : vtk…

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## [Unknown CMake command "vtk\_module\_autoinit"](https://discourse.vtk.org/t/unknown-cmake-command-vtk-module-autoinit/12621)

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**Author:** [@Silokhin\_Ilya](https://discourse.vtk.org/u/Silokhin_Ilya)\
**Replies:** 6\
**Last updated:** [November 22, 2023, 1:43pm UTC](https://discourse.vtk.org/t/unknown-cmake-command-vtk-module-autoinit/12621 "2023-11-22T13:43:53Z")

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I downloaded VTK-8.2 and wanted to test it with an example. Example: here. But I can not configure my project. An error occurs: CMake Error at CMakeLists.txt:28 (vtk\_module\_autoinit): Unknown CMake command “vtk\_module\_a…

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## [Retrieve the mapped colors from vtkOpenGLPolyDataMapper](https://discourse.vtk.org/t/retrieve-the-mapped-colors-from-vtkopenglpolydatamapper/12760)

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**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 6\
**Last updated:** [November 21, 2023, 10:31pm UTC](https://discourse.vtk.org/t/retrieve-the-mapped-colors-from-vtkopenglpolydatamapper/12760 "2023-11-21T22:31:38Z")

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Hi Guys I am in a situation where I am using a LUT for displaying vtkPolyData. I would like to transfer the colors that the mapper uses to the ‘Color’ PointArray of the vtkPolyData instance, such that I can save the col…

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## [How can I get the upgrade logs of vtk from 8.0 to 8.2](https://discourse.vtk.org/t/how-can-i-get-the-upgrade-logs-of-vtk-from-8-0-to-8-2/12757)

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**Author:** [@Hedwig\_Huang](https://discourse.vtk.org/u/Hedwig_Huang)\
**Replies:** 2\
**Last updated:** [November 21, 2023, 1:11pm UTC](https://discourse.vtk.org/t/how-can-i-get-the-upgrade-logs-of-vtk-from-8-0-to-8-2/12757 "2023-11-21T13:11:00Z")

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Hi there. I try to upgrade my software from VTK8.0 to VTK8.2, by simply replacing some vtk dlls and errors occured, showed that cannot find the specified module, I thought that might be some functions were modified or re…

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## [How to force VTK use the Unicode version of MFC?](https://discourse.vtk.org/t/how-to-force-vtk-use-the-unicode-version-of-mfc/12712)

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**Author:** [@Paavo\_Helde](https://discourse.vtk.org/u/Paavo_Helde)\
**Replies:** 14\
**Last updated:** [November 20, 2023, 11:57pm UTC](https://discourse.vtk.org/t/how-to-force-vtk-use-the-unicode-version-of-mfc/12712 "2023-11-20T23:57:23Z")

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We are in the process of upgrading to VTK v9.2.6. We have a Windows MFC program and it gives debug asserts in AfxGetInstanceHandle(), apparently because the VTK vtkGUISupportMFCd.dll appears to be linked to mfc140d.dll,…

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## [Issue with vtkPassSelectedArrays](https://discourse.vtk.org/t/issue-with-vtkpassselectedarrays/12755)

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**Author:** [@Thomas\_Theussl](https://discourse.vtk.org/u/Thomas_Theussl)\
**Replies:** 0\
**Last updated:** [November 20, 2023, 1:09pm UTC](https://discourse.vtk.org/t/issue-with-vtkpassselectedarrays/12755 "2023-11-20T13:09:55Z")

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I want to use vtkExtractVectorComponents to do some computation with the components of a vector field, this works fine as long as the vector field is the first array in the data set. When I have more arrays, the first o…

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## [vtkChartLegend missing legend for Line in a Stacked Bar / Line Chart - vtk ChartXY](https://discourse.vtk.org/t/vtkchartlegend-missing-legend-for-line-in-a-stacked-bar-line-chart-vtk-chartxy/12740)

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**Author:** [@DavidA](https://discourse.vtk.org/u/DavidA)\
**Replies:** 6\
**Last updated:** [November 20, 2023, 11:04am UTC](https://discourse.vtk.org/t/vtkchartlegend-missing-legend-for-line-in-a-stacked-bar-line-chart-vtk-chartxy/12740 "2023-11-20T11:04:44Z")

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I have written C++ code for a Stacked Bar / Line plot but I am not getting the proper legend and I cannot work out why. The legend works fine in a simple Bar / Line plot, but as soon as I introduced a second input array…

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## [Create nurbsurface with vvtk](https://discourse.vtk.org/t/create-nurbsurface-with-vvtk/12673)

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**Author:** [@Loic\_Azegha](https://discourse.vtk.org/u/Loic_Azegha)\
**Replies:** 16\
**Last updated:** [November 20, 2023, 8:44am UTC](https://discourse.vtk.org/t/create-nurbsurface-with-vvtk/12673 "2023-11-20T08:44:56Z")

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Hello, I would like to know if it is possible to create nurbs surfaces with vtk? If possible, could you guide me with a simple example? Thank you for your feedback.

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## [VTK has Problem with OpenGL and Rendering on raspberry pi 4](https://discourse.vtk.org/t/vtk-has-problem-with-opengl-and-rendering-on-raspberry-pi-4/12638)

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**Author:** [@Hamzeh74](https://discourse.vtk.org/u/Hamzeh74)\
**Replies:** 10\
**Last updated:** [November 19, 2023, 8:17pm UTC](https://discourse.vtk.org/t/vtk-has-problem-with-opengl-and-rendering-on-raspberry-pi-4/12638 "2023-11-19T20:17:12Z")

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I have successfully installed the opengl on reaspberry pi and runned demos of opengl and does not have any problem but when I run the vtk example (ReadOBJ) it gives me a lot of error that I cannot figure out what that i…

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## [Does vtk have the function of anchoring to a certain point of an actor?](https://discourse.vtk.org/t/does-vtk-have-the-function-of-anchoring-to-a-certain-point-of-an-actor/12750)

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**Author:** [@xjjgjmeng](https://discourse.vtk.org/u/xjjgjmeng)\
**Replies:** 0\
**Last updated:** [November 18, 2023, 2:37pm UTC](https://discourse.vtk.org/t/does-vtk-have-the-function-of-anchoring-to-a-certain-point-of-an-actor/12750 "2023-11-18T14:37:19Z")

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Now I want to implement a function: there are two actors, connected by a dotted line between them. The two actors can be moved by the mouse. The dotted line cannot be moved directly by the mouse, but when any actor is mo…

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## [Extracting Data from CFF Fluent Files to CSV File](https://discourse.vtk.org/t/extracting-data-from-cff-fluent-files-to-csv-file/12737)

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**Author:** [@hoehnp](https://discourse.vtk.org/u/hoehnp)\
**Replies:** 1\
**Last updated:** [November 17, 2023, 10:16pm UTC](https://discourse.vtk.org/t/extracting-data-from-cff-fluent-files-to-csv-file/12737 "2023-11-17T22:16:55Z")

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Hi, for quick sanity checks of simulation results from Fluent I would like to generate an Image of the 3d data cut a long a predefined plane. Since the vtkFLUENTCFFReader is very new I did only find the test cases given…

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## [How to get stack trace of vtkDebugLeaks infos on Windows](https://discourse.vtk.org/t/how-to-get-stack-trace-of-vtkdebugleaks-infos-on-windows/12729)

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**Author:** [@TangLung-cn](https://discourse.vtk.org/u/TangLung-cn)\
**Replies:** 3\
**Last updated:** [November 17, 2023, 12:12pm UTC](https://discourse.vtk.org/t/how-to-get-stack-trace-of-vtkdebugleaks-infos-on-windows/12729 "2023-11-17T12:12:50Z")

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Hi Does anyone can tell me how to get the stack trace of vtkDebugLeaks infos on Windows. I use VTK8.1 in Qt project, I only can get the brief info of VTK leak info when the program exist. Thanks.

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## [build VTK9.1.0 error use Mingw64 in win10](https://discourse.vtk.org/t/build-vtk9-1-0-error-use-mingw64-in-win10/7076)

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**Author:** [@Lee1](https://discourse.vtk.org/u/Lee1)\
**Replies:** 13\
**Last updated:** [November 17, 2023, 4:18am UTC](https://discourse.vtk.org/t/build-vtk9-1-0-error-use-mingw64-in-win10/7076 "2023-11-17T04:18:17Z")

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\[ 94%\] Linking CXX shared library ..\\..\\bin\\libvtkImagingMorphological-9.1d.dll CMakeFiles\\ImagingMorphological.dir/objects.a(vtkImageConnectivityFilter.cxx.obj):D:/workspaces/VTK/VTK-9.1.0.rc4/Imaging/Morphological/vtkI…

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## [VTK Multithreading maloc errors](https://discourse.vtk.org/t/vtk-multithreading-maloc-errors/12671)

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**Author:** [@LeslieM98](https://discourse.vtk.org/u/LeslieM98)\
**Replies:** 1\
**Last updated:** [November 17, 2023, 4:16am UTC](https://discourse.vtk.org/t/vtk-multithreading-maloc-errors/12671 "2023-11-17T04:16:43Z")

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Hi everyone, I am trying to get VTK to work in a Multithreaded environment. My goal is to display roughly 6k Vertices as a Mesh that is rendered as a regular 3d Object with indices. The rendered Data comes from a ZeroMQ…

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## [Error launching my program with VTK](https://discourse.vtk.org/t/error-launching-my-program-with-vtk/12666)

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**Author:** [@Guilhem](https://discourse.vtk.org/u/Guilhem)\
**Replies:** 5\
**Last updated:** [November 17, 2023, 4:12am UTC](https://discourse.vtk.org/t/error-launching-my-program-with-vtk/12666 "2023-11-17T04:12:12Z")

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Hello everyone, When I run my program in debug mode with VTK version 9.2, I get the following error : In function \`vtkGenericDataArray\<vtkAOSDataArrayTemplate\<long long\>, long long\>::SetValue(long long, long long)': us…

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## [Building VTK from Source with Modules](https://discourse.vtk.org/t/building-vtk-from-source-with-modules/12608)

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**Author:** [@Hasnain\_Raza](https://discourse.vtk.org/u/Hasnain_Raza)\
**Replies:** 10\
**Last updated:** [November 17, 2023, 3:52am UTC](https://discourse.vtk.org/t/building-vtk-from-source-with-modules/12608 "2023-11-17T03:52:27Z")

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I’m trying to build VTK from the source on Windows with three modules enabled. I got the source from here and I’m enabling VTK::RenderingOpenGL2, VTK::RenderingOpenVR, and VTK::RenderingOpenXR. The building process I fo…

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## [Creating a circle cursor and picking](https://discourse.vtk.org/t/creating-a-circle-cursor-and-picking/12733)

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**Author:** [@totte\_karlsson](https://discourse.vtk.org/u/totte_karlsson)\
**Replies:** 1\
**Last updated:** [November 16, 2023, 8:30pm UTC](https://discourse.vtk.org/t/creating-a-circle-cursor-and-picking/12733 "2023-11-16T20:30:26Z")

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Hello, We need to implement a custom cursor, a hollow circle, which radius can be modified by for example the scroll wheel. End of the day, we want to do picking inside this circle, in order to connect nodes in polylin…

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## [Build VTK9.3.0 Msys2/Mingw64 on Win10 - undefined reference to template](https://discourse.vtk.org/t/build-vtk9-3-0-msys2-mingw64-on-win10-undefined-reference-to-template/12720)

<div class="topic-metadata">

**Author:** [@kchansen](https://discourse.vtk.org/u/kchansen)\
**Replies:** 0\
**Last updated:** [November 16, 2023, 12:08am UTC](https://discourse.vtk.org/t/build-vtk9-3-0-msys2-mingw64-on-win10-undefined-reference-to-template/12720 "2023-11-16T00:08:51Z")

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Similar to: V9.1.0 Build Error Building V9.3.0 using msys2/mingw64 with cmake/ninja on Windows10 for a new project. Have used & built VTK in the past but several years ago. I had to add the following to CMakeLists.txt: …

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## [Euler number. Get the number of edges, faces and vertices](https://discourse.vtk.org/t/euler-number-get-the-number-of-edges-faces-and-vertices/12717)

<div class="topic-metadata">

**Author:** [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)\
**Replies:** 2\
**Last updated:** [November 15, 2023, 9:01pm UTC](https://discourse.vtk.org/t/euler-number-get-the-number-of-edges-faces-and-vertices/12717 "2023-11-15T21:01:33Z")

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Hi Developers I would like to filter some surfaces based on their Euler characteristic. I need to compute the number the Euler number = V - E + F. The number of vertices (number of points) and number of faces (number o…

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