# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=8

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

**Page:** 9

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## [Setting InteractiveOff on vtkRenderer instance has no effect](https://discourse.vtk.org/t/setting-interactiveoff-on-vtkrenderer-instance-has-no-effect/15758)

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**Author:** [@MaxFleur](https://discourse.vtk.org/u/MaxFleur)\
**Replies:** 1\
**Last updated:** [June 24, 2025, 4:28pm UTC](https://discourse.vtk.org/t/setting-interactiveoff-on-vtkrenderer-instance-has-no-effect/15758 "2025-06-24T16:28:02Z")

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I want to visualize a mesh structure in front of a video stream. To achieve this, I want to do this in a way similar to the background image example provided by the official docs. This means that I will use a separate ac…

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## [vtkPlotPoints bad scaling when zooming on a vtkChartXY](https://discourse.vtk.org/t/vtkplotpoints-bad-scaling-when-zooming-on-a-vtkchartxy/15753)

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**Author:** [@Timothee\_DABADIE](https://discourse.vtk.org/u/Timothee_DABADIE)\
**Replies:** 1\
**Last updated:** [June 24, 2025, 12:34pm UTC](https://discourse.vtk.org/t/vtkplotpoints-bad-scaling-when-zooming-on-a-vtkchartxy/15753 "2025-06-24T12:34:58Z")

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Hey everyone, I’m new to VTK and want to use it for data visualization, I created my vtkContextView loaded with a vtkChartXY that contains x vtkPlotLine i then implemented my own vtkContextInteractor to craete my own …

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## [Sharing Polydata or VBO etc between mappers](https://discourse.vtk.org/t/sharing-polydata-or-vbo-etc-between-mappers/14775)

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**Author:** [@geoffw](https://discourse.vtk.org/u/geoffw)\
**Replies:** 6\
**Last updated:** [June 23, 2025, 4:10pm UTC](https://discourse.vtk.org/t/sharing-polydata-or-vbo-etc-between-mappers/14775 "2025-06-23T16:10:14Z")

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I’m a little confused about the right way to do instancing in vtk. In some places in our code, we use the vtkGlyphMapper which works great but can be tricky to set up. In other places, we just share a mapper between mult…

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## [Tracking Boundary Edges During Region Growing](https://discourse.vtk.org/t/tracking-boundary-edges-during-region-growing/15755)

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**Author:** [@Pietro\_Furlan](https://discourse.vtk.org/u/Pietro_Furlan)\
**Replies:** 0\
**Last updated:** [June 23, 2025, 1:59pm UTC](https://discourse.vtk.org/t/tracking-boundary-edges-during-region-growing/15755 "2025-06-23T13:59:33Z")

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Hi, I am working with the vtkPolyDataEdgeConnectivityFilter in Python to extract and grow regions from a polydata mesh. My goal is to track the boundary edges (edges between different regions) during the region growing …

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## [How to solve the problem when vtkChart::LINE and vtkChart::POINTS overlap in vtkChart?](https://discourse.vtk.org/t/how-to-solve-the-problem-when-vtkchart-line-and-vtkchart-points-overlap-in-vtkchart/15750)

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**Author:** [@vander](https://discourse.vtk.org/u/vander)\
**Replies:** 0\
**Last updated:** [June 20, 2025, 8:54am UTC](https://discourse.vtk.org/t/how-to-solve-the-problem-when-vtkchart-line-and-vtkchart-points-overlap-in-vtkchart/15750 "2025-06-20T08:54:24Z")

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Hi, I have inserted a vtkChart::LINE and a set of vtkChart::POINTS in vtkChart. vtkChart::POINTS are on vtkChart::LINE. But when I drag the plot with the mouse, vtkChart::LINE and vtkChart::POINTS send separated and the …

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## [Python interpreter dies using vtkHDFWriter to write partitioned data set collection](https://discourse.vtk.org/t/python-interpreter-dies-using-vtkhdfwriter-to-write-partitioned-data-set-collection/15746)

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**Author:** [@citronella3alain](https://discourse.vtk.org/u/citronella3alain)\
**Replies:** 3\
**Last updated:** [June 19, 2025, 8:57am UTC](https://discourse.vtk.org/t/python-interpreter-dies-using-vtkhdfwriter-to-write-partitioned-data-set-collection/15746 "2025-06-19T08:57:32Z")

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I’m trying to write a PartitionedDataSetCollection to a vtkhdf file using vtk in python. In the collection, I have two separate partitioned data sets, each with one partition. The first one’s partition contains a sphere …

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## [Possible bug in in numpy\_interface.algorithms.matmul?](https://discourse.vtk.org/t/possible-bug-in-in-numpy-interface-algorithms-matmul/15744)

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**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 1\
**Last updated:** [June 18, 2025, 10:59pm UTC](https://discourse.vtk.org/t/possible-bug-in-in-numpy-interface-algorithms-matmul/15744 "2025-06-18T22:59:19Z")

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Hello!!! I’m using VTK 9.4 with Python 3.12 I’m trying to use the numpy\_interface.algorithms.matmul method on a vtkCompositeDataArray and finding that it’s not doing what I expect. IMO, there’s either an error in matm…

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## [VTK on single GPU in TCC Mode](https://discourse.vtk.org/t/vtk-on-single-gpu-in-tcc-mode/15734)

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**Author:** [@dpseiter](https://discourse.vtk.org/u/dpseiter)\
**Replies:** 1\
**Last updated:** [June 18, 2025, 8:13am UTC](https://discourse.vtk.org/t/vtk-on-single-gpu-in-tcc-mode/15734 "2025-06-18T08:13:26Z")

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Hi all, We’re experimenting with switching a Windows server running a single GPU to TCC mode in order to run some processing tasks when no users are logged in. As a result of the mode change, we can’t use that GPU for …

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## [Rust bindings](https://discourse.vtk.org/t/rust-bindings/15700)

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**Author:** [@jonaspleyer](https://discourse.vtk.org/u/jonaspleyer)\
**Replies:** 34\
**Last updated:** [June 17, 2025, 10:41am UTC](https://discourse.vtk.org/t/rust-bindings/15700 "2025-06-17T10:41:15Z")

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Hey everyone, I am still relatively new to the more fundamental components of VTK. I saw that many other programming languages (such as Python, C#) have bindings which are supported by the community. Since I noticed tha…

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## [Issue building/running Examples](https://discourse.vtk.org/t/issue-building-running-examples/15711)

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**Author:** [@cvolpe](https://discourse.vtk.org/u/cvolpe)\
**Replies:** 7\
**Last updated:** [June 13, 2025, 10:45am UTC](https://discourse.vtk.org/t/issue-building-running-examples/15711 "2025-06-13T10:45:03Z")

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I’m getting back into VTK after a long absence. I just built the C++ libs on Windows and I specified to build the examples when configuring with CMake. It generated the solution, and I built it, but could not find any bu…

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## [Porting VectorDot example to Java](https://discourse.vtk.org/t/porting-vectordot-example-to-java/15721)

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**Author:** [@jMaxR](https://discourse.vtk.org/u/jMaxR)\
**Replies:** 3\
**Last updated:** [June 13, 2025, 10:19am UTC](https://discourse.vtk.org/t/porting-vectordot-example-to-java/15721 "2025-06-13T10:19:29Z")

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Hi, in my long journey to build a swept surface with VTK (How to build a swept surface ?), I begun by the begining: creating the enveloppe curve defined by a dot product. Thus I tried to port the VectorDot example (https…

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## [How can vtkCompositePolyDataMapper achive the effect of all data blocks facing the camera?](https://discourse.vtk.org/t/how-can-vtkcompositepolydatamapper-achive-the-effect-of-all-data-blocks-facing-the-camera/15659)

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**Author:** [@Guo8](https://discourse.vtk.org/u/Guo8)\
**Replies:** 1\
**Last updated:** [June 12, 2025, 8:00am UTC](https://discourse.vtk.org/t/how-can-vtkcompositepolydatamapper-achive-the-effect-of-all-data-blocks-facing-the-camera/15659 "2025-06-12T08:00:52Z")

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Hi VTK users, I am trying to use vtkMultiBlockDataSet + vtkCompositePolyDataMapper to handle lots of dimension/tolerance labels (which has numbers, symbols and frames), but found that vtkFollower did not work correctly …

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## [VTKHDF PartitionedDataSetCollection (PDC) file not working in Paraview](https://discourse.vtk.org/t/vtkhdf-partitioneddatasetcollection-pdc-file-not-working-in-paraview/14553)

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**Author:** [@jpmorr](https://discourse.vtk.org/u/jpmorr)\
**Replies:** 5\
**Last updated:** [June 11, 2025, 1:33pm UTC](https://discourse.vtk.org/t/vtkhdf-partitioneddatasetcollection-pdc-file-not-working-in-paraview/14553 "2025-06-11T13:33:42Z")

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I’m trying to create a VTKHDF file that has multiple blocks in it but I’ve not managed to do so yet. My initial question was here where I was pointed towards the documentation and given a working example file. Rather tha…

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## [problems with vtkContourTriangulator and vtkContourLoopExtration](https://discourse.vtk.org/t/problems-with-vtkcontourtriangulator-and-vtkcontourloopextration/15598)

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**Author:** [@NewPony](https://discourse.vtk.org/u/NewPony)\
**Replies:** 3\
**Last updated:** [June 11, 2025, 7:08am UTC](https://discourse.vtk.org/t/problems-with-vtkcontourtriangulator-and-vtkcontourloopextration/15598 "2025-06-11T07:08:55Z")

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Hello at all, i have a problem slicing vtkPolyData, and i am stuck there for days now. I tried the following two pipelines. first with vtkContourTriangulator: vtkCleanPolyData vtkCutter vtkStripper vtkCont…

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## [Anisotropic order lagrange mesh](https://discourse.vtk.org/t/anisotropic-order-lagrange-mesh/15719)

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**Author:** [@helloworld922](https://discourse.vtk.org/u/helloworld922)\
**Replies:** 0\
**Last updated:** [June 10, 2025, 1:00pm UTC](https://discourse.vtk.org/t/anisotropic-order-lagrange-mesh/15719 "2025-06-10T13:00:06Z")

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Hi, I’m trying to create an anisotropic order Lagrange mesh which is linear in x and quadratic in y. Here’s a minimal example of what I’m doing: import vtk from vtkmodules.vtkRenderingCore import vtkProperty order = \[2…

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## [VTK to OpenVDB file format](https://discourse.vtk.org/t/vtk-to-openvdb-file-format/6322)

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**Author:** [@tkeskita](https://discourse.vtk.org/u/tkeskita)\
**Replies:** 12\
**Last updated:** [June 6, 2025, 2:48pm UTC](https://discourse.vtk.org/t/vtk-to-openvdb-file-format/6322 "2025-06-06T14:48:08Z")

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Hi, This post was created to summarize current status of possibilities to convert/export VTK 3D image data into OpenVDB volumetric voxel data / grid format (.vdb). This is getting to be a frequently asked question, so I…

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## [Building custom wheels of VTK](https://discourse.vtk.org/t/building-custom-wheels-of-vtk/15701)

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**Author:** [@utkarshayachit](https://discourse.vtk.org/u/utkarshayachit)\
**Replies:** 7\
**Last updated:** [June 6, 2025, 7:48am UTC](https://discourse.vtk.org/t/building-custom-wheels-of-vtk/15701 "2025-06-06T07:48:59Z")

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I am trying to build my own custom (minimal) wheel of VTK. However, I am seeing that the VTK libraries (i.e. libvtkCommonCore.so, etc.) are not getting included in wheel package. The .sos for the Python module are includ…

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## [Internal surfaces created when cliping by scalar OpenFOAM data](https://discourse.vtk.org/t/internal-surfaces-created-when-cliping-by-scalar-openfoam-data/15655)

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**Author:** [@gnikit](https://discourse.vtk.org/u/gnikit)\
**Replies:** 1\
**Last updated:** [June 4, 2025, 6:03am UTC](https://discourse.vtk.org/t/internal-surfaces-created-when-cliping-by-scalar-openfoam-data/15655 "2025-06-04T06:03:19Z")

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Hi I am facing some problems with reading to VTK OpenFOAM data and performing a scalar clip on the mesh. The issue seems to be present when refinement regions are present, which in turn results to internal surfaces in Pa…

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## [VTK9.1: Boolean difference operation with two cube sources to create a box leads to error](https://discourse.vtk.org/t/vtk9-1-boolean-difference-operation-with-two-cube-sources-to-create-a-box-leads-to-error/15680)

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**Author:** [@imax10000](https://discourse.vtk.org/u/imax10000)\
**Replies:** 1\
**Last updated:** [June 3, 2025, 6:00pm UTC](https://discourse.vtk.org/t/vtk9-1-boolean-difference-operation-with-two-cube-sources-to-create-a-box-leads-to-error/15680 "2025-06-03T18:00:51Z")

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Hello, I’m trying to create a box from two cube sources that have nearly the same center and one cube is slightly smaller than the other. By applying a difference operation using vtkBooleanOperationPolyDataFilter I want…

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## [How to build a swept surface ?](https://discourse.vtk.org/t/how-to-build-a-swept-surface/15692)

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**Author:** [@jMaxR](https://discourse.vtk.org/u/jMaxR)\
**Replies:** 3\
**Last updated:** [June 3, 2025, 2:13pm UTC](https://discourse.vtk.org/t/how-to-build-a-swept-surface/15692 "2025-06-03T14:13:37Z")

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Hello, I’m trying to build a swept surface from a volume moving in space. I found sweptVtk.tcl in the old Tcl examples, but vtkSweptSurface no longer exists in VTK9. How should I do with current VTK? By successive Boolea…

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## [non-manifold error when clipping polyhedra+hexahedron domain](https://discourse.vtk.org/t/non-manifold-error-when-clipping-polyhedra-hexahedron-domain/15683)

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**Author:** [@pcristini](https://discourse.vtk.org/u/pcristini)\
**Replies:** 3\
**Last updated:** [June 2, 2025, 7:47am UTC](https://discourse.vtk.org/t/non-manifold-error-when-clipping-polyhedra-hexahedron-domain/15683 "2025-06-02T07:47:25Z")

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I have a domain that I’m exporting from CFD results (exporter written by me). This domain has mixed cell types, mostly polyhedra & hexahedra. When I clip the domain, without crinkle cut, I receive the following warning …

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## [Dynamic Annotation Issues with Reslice Cursor in VTK MPR Views](https://discourse.vtk.org/t/dynamic-annotation-issues-with-reslice-cursor-in-vtk-mpr-views/15693)

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**Author:** [@christeen](https://discourse.vtk.org/u/christeen)\
**Replies:** 0\
**Last updated:** [June 1, 2025, 6:43am UTC](https://discourse.vtk.org/t/dynamic-annotation-issues-with-reslice-cursor-in-vtk-mpr-views/15693 "2025-06-01T06:43:45Z")

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Problem Statement I’m implementing dynamic orientation labels (A/P/I/S/L/R) for reslice cursors in multi-planar reconstruction (MPR) views (axial, coronal, sagittal). The labels should update during rotations, with spec…

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## [Create a 3D mesh from sparse spaced 2D segmentation](https://discourse.vtk.org/t/create-a-3d-mesh-from-sparse-spaced-2d-segmentation/15685)

<div class="topic-metadata">

**Author:** [@chourroutm](https://discourse.vtk.org/u/chourroutm)\
**Replies:** 3\
**Last updated:** [May 30, 2025, 11:59pm UTC](https://discourse.vtk.org/t/create-a-3d-mesh-from-sparse-spaced-2d-segmentation/15685 "2025-05-30T23:59:55Z")

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Hello, I’m trying to find the best meshing algorithm for a set of 200 evenly spaced 2D segmentations: every 20th slice is annotated in the isotropic data along the y axis with a total bounding box of 5197 x 3980 x 3425.…

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## [Performance issues with vtkOpenGLBatchedPolyDataMapper](https://discourse.vtk.org/t/performance-issues-with-vtkopenglbatchedpolydatamapper/15590)

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**Author:** [@geoffw](https://discourse.vtk.org/u/geoffw)\
**Replies:** 13\
**Last updated:** [May 30, 2025, 6:27pm UTC](https://discourse.vtk.org/t/performance-issues-with-vtkopenglbatchedpolydatamapper/15590 "2025-05-30T18:27:04Z")

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Hi there, We are upgrading to vtk 9.4.2 and are experiencing slow performance. The part of our system in question has a single mapper that is associated with many actors. The problem is that the VBOs are getting constan…

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## [Using VTK to save manage and write external array](https://discourse.vtk.org/t/using-vtk-to-save-manage-and-write-external-array/15554)

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**Author:** [@lgkl](https://discourse.vtk.org/u/lgkl)\
**Replies:** 6\
**Last updated:** [May 29, 2025, 3:21pm UTC](https://discourse.vtk.org/t/using-vtk-to-save-manage-and-write-external-array/15554 "2025-05-29T15:21:16Z")

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I’m currently studying ways to integrate VTK into my electromagnetic solver. My main motivation for this is compatibility with paraview. I’ve actually managed to write valid XML with binary data myself without using VTK …

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## [Results from vtkCell::Clip()](https://discourse.vtk.org/t/results-from-vtkcell-clip/15678)

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**Author:** [@PeterFranzSeequent](https://discourse.vtk.org/u/PeterFranzSeequent)\
**Replies:** 8\
**Last updated:** [May 29, 2025, 2:24am UTC](https://discourse.vtk.org/t/results-from-vtkcell-clip/15678 "2025-05-29T02:24:49Z")

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Hi, I don’t quite understand how vtkCell::Clip() returns the information about the clipping artifacts. As far as I can see the connectivity is returned as a vtkCellArray called connectivity in the documentation. To my …

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## [Inconsistent building error "error: expected a ";" "](https://discourse.vtk.org/t/inconsistent-building-error-error-expected-a/15665)

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**Author:** [@lcebur](https://discourse.vtk.org/u/lcebur)\
**Replies:** 7\
**Last updated:** [May 27, 2025, 11:46am UTC](https://discourse.vtk.org/t/inconsistent-building-error-error-expected-a/15665 "2025-05-27T11:46:42Z")

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When building VTK on Rocky 9.5 and Intel compilers we get the following errors: In file included from /home/myaux/ParaView-v5.11.1/VTK/ThirdParty/glew/vtkglew/src/glew.c(41): …

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## [Integrate VTK inside egui](https://discourse.vtk.org/t/integrate-vtk-inside-egui/15662)

<div class="topic-metadata">

**Author:** [@Gerharddc](https://discourse.vtk.org/u/Gerharddc)\
**Replies:** 5\
**Last updated:** [May 26, 2025, 3:05pm UTC](https://discourse.vtk.org/t/integrate-vtk-inside-egui/15662 "2025-05-26T15:05:17Z")

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Hi, I am trying to use VTK to create custom widgets for use with egui.rs. To do so I have tried combining the egui example for custom OpenGL widgets at egui/examples/custom\_3d\_glow/src/main.rs at main · emilk/egui · GitH…

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## [How can I render volume with vtk webAssembly](https://discourse.vtk.org/t/how-can-i-render-volume-with-vtk-webassembly/13737)

<div class="topic-metadata">

**Author:** [@leo](https://discourse.vtk.org/u/leo)\
**Replies:** 7\
**Last updated:** [May 26, 2025, 11:59am UTC](https://discourse.vtk.org/t/how-can-i-render-volume-with-vtk-webassembly/13737 "2025-05-26T11:59:36Z")

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I’m trying to render a volume using vtk webAssembly, but it doesn’t work. I would like to know if vtk webAssembly supports volume rendering, and if not, do I have any alternatives?

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## [Automatic Annotation Label Updates for Axial/Coronal/Sagittal Views with vtkResliceImageViewer & vtkResliceCursor](https://discourse.vtk.org/t/automatic-annotation-label-updates-for-axial-coronal-sagittal-views-with-vtkresliceimageviewer-vtkreslicecursor/15669)

<div class="topic-metadata">

**Author:** [@christeen](https://discourse.vtk.org/u/christeen)\
**Replies:** 0\
**Last updated:** [May 26, 2025, 8:04am UTC](https://discourse.vtk.org/t/automatic-annotation-label-updates-for-axial-coronal-sagittal-views-with-vtkresliceimageviewer-vtkreslicecursor/15669 "2025-05-26T08:04:44Z")

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Hi all, I’m working on a Qt + VTK (v8.2) application in C++ that displays three orthogonal slice views (axial, coronal, sagittal) using vtkResliceImageViewer and a shared vtkResliceCursor from axial to coronal and sagit…

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