# vtk Unstructured Grid

**URL:** https://discourse.paraview.org/t/vtk-unstructured-grid/15896
**Category:** ParaView Support
**Created:** [December 24, 2024, 4:37am UTC](https://discourse.paraview.org/t/vtk-unstructured-grid/15896 "2024-12-24T04:37:18Z")
**Posts on this page:** 6
**Page:** 1

<div class="post-metadata">

### Author: ![Dario](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/d/bc79bd/32.png) [@Dario](https://discourse.paraview.org/u/Dario)
#### Post date: [December 24, 2024, 4:37am UTC](https://discourse.paraview.org/t/vtk-unstructured-grid/15896/1 "2024-12-24T04:37:18Z")

</div>

Hi everyone, I’m trying to upload an unstructured grid vtk file into Paraview to visualize a Voronoi tessellation, but it crashes and the following error appears:

```auto
Loguru caught a signal: SIGSEGV
Stack trace:
78 0x407b2a /opt/ParaView-5.9.1/bin/paraview-real() [0x407b2a]
77 0x7f8e99cdc840 __libc_start_main + 240
76 0x40778a /opt/ParaView-5.9.1/bin/paraview-real() [0x40778a]
75 0x7f8e9717a120 QCoreApplication::exec() + 128
74 0x7f8e9717162a QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 298
73 0x7f8e609bae13 /opt/ParaView-5.9.1/plugins/platforms/../../lib/libQt5XcbQpa.so.5(+0x5ee13) [0x7f8e609bae13]
72 0x7f8e977fab9b QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 187
71 0x7f8e9781f5f5 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 261
70 0x7f8e9781e36d QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) + 1837
69 0x7f8e97172dd8 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 280
68 0x7f8e99132260 QApplication::notify(QObject*, QEvent*) + 704
67 0x7f8e9912b18c QApplicationPrivate::notify_helper(QObject*, QEvent*) + 156
66 0x7f8e991858fb /opt/ParaView-5.9.1/bin/../lib/libQt5Widgets.so.5(+0x1b68fb) [0x7f8e991858fb]
65 0x7f8e99182d86 /opt/ParaView-5.9.1/bin/../lib/libQt5Widgets.so.5(+0x1b3d86) [0x7f8e99182d86]
64 0x7f8e991317cc QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) + 460
63 0x7f8e97172dd8 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 280
62 0x7f8e99132dc8 QApplication::notify(QObject*, QEvent*) + 3624
61 0x7f8e9912b18c QApplicationPrivate::notify_helper(QObject*, QEvent*) + 156
60 0x7f8e99168c28 QWidget::event(QEvent*) + 424
59 0x7f8e9920e945 QAbstractButton::mouseReleaseEvent(QMouseEvent*) + 213
58 0x7f8e9920e77a /opt/ParaView-5.9.1/bin/../lib/libQt5Widgets.so.5(+0x23f77a) [0x7f8e9920e77a]
57 0x7f8e9920d45a /opt/ParaView-5.9.1/bin/../lib/libQt5Widgets.so.5(+0x23e45a) [0x7f8e9920d45a]
56 0x7f8e9920d272 QAbstractButton::clicked(bool) + 50
55 0x7f8e971a11ea QMetaObject::activate(QObject*, int, int, void**) + 1850
54 0x7f8e989ef01f pqPropertiesPanel::apply() + 687
53 0x7f8e988a43c2 pqPropertiesPanel::applied(pqProxy*) + 50
52 0x7f8e971a11ea QMetaObject::activate(QObject*, int, int, void**) + 1850
51 0x7f8e998e6c51 pqApplyBehavior::applied(pqPropertiesPanel*, pqProxy*) + 193
50 0x7f8e998e7dce pqApplyBehavior::showData(pqPipelineSource*, pqView*) + 414
49 0x7f8e8c4d53c8 vtkSMParaViewPipelineControllerWithRendering::ShowInPreferredView(vtkSMSourceProxy*, int, vtkSMViewProxy*) + 168
48 0x7f8e8c4d3164 vtkSMParaViewPipelineControllerWithRendering::UpdatePipelineBeforeDisplay(vtkSMSourceProxy*, int, vtkSMViewProxy*) + 212
47 0x7f8e96577dcc vtkSMSourceProxy::UpdatePipeline(double) + 140
46 0x7f8e964f6e58 vtkSMOutputPort::UpdatePipelineInternal(double, bool) + 184
45 0x7f8e964452e5 vtkPVSessionBase::ExecuteStream(unsigned int, vtkClientServerStream const&, bool) + 53
44 0x7f8e964462bb vtkPVSessionCore::ExecuteStream(unsigned int, vtkClientServerStream const&, bool) + 59
43 0x7f8e96446482 vtkPVSessionCore::ExecuteStreamInternal(vtkClientServerStream const&, bool) + 242
42 0x7f8e952f9ddd vtkClientServerInterpreter::ProcessStream(vtkClientServerStream const&) + 29
41 0x7f8e952f9b3e vtkClientServerInterpreter::ProcessOneMessage(vtkClientServerStream const&, int) + 1294
40 0x7f8e952f940d vtkClientServerInterpreter::ProcessCommandInvoke(vtkClientServerStream const&, int) + 1229
39 0x7f8e952f8da9 vtkClientServerInterpreter::CallCommandFunction(char const*, vtkObjectBase*, char const*, vtkClientServerStream const&, vtkClientServerStream&) + 345
38 0x7f8e8d36bf9e vtkSIMetaReaderProxyCommand(vtkClientServerInterpreter*, vtkObjectBase*, char const*, vtkClientServerStream const&, vtkClientServerStream&, void*) + 446
37 0x7f8e952f8da9 vtkClientServerInterpreter::CallCommandFunction(char const*, vtkObjectBase*, char const*, vtkClientServerStream const&, vtkClientServerStream&) + 345
36 0x7f8e8d371aab vtkSISourceProxyCommand(vtkClientServerInterpreter*, vtkObjectBase*, char const*, vtkClientServerStream const&, vtkClientServerStream&, void*) + 971
35 0x7f8e96482494 vtkSISourceProxy::UpdatePipeline(int, double, bool) + 468
34 0x7f8e9205fc1a vtkStreamingDemandDrivenPipeline::Update(int, vtkInformationVector*) + 282
33 0x7f8e9201ffa6 vtkDemandDrivenPipeline::UpdateData(int) + 134
32 0x7f8e9205e859 vtkStreamingDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 953
31 0x7f8e92020f8e vtkDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 222
30 0x7f8e9201a6c1 vtkCompositeDataPipeline::ForwardUpstream(vtkInformation*) + 337
29 0x7f8e9205e859 vtkStreamingDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 953
28 0x7f8e92020fe6 vtkDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 310
27 0x7f8e9201b7d1 vtkCompositeDataPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 113
26 0x7f8e9201e967 vtkDemandDrivenPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 55
25 0x7f8e9202473e vtkExecutive::CallAlgorithm(vtkInformation*, int, vtkInformationVector**, vtkInformationVector*) + 62
24 0x7f8e8c83c33d vtkFileSeriesReader::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 301
23 0x7f8e8c83c0f5 vtkFileSeriesReader::RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 181
22 0x7f8e79216864 vtkPDataSetReader::RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 932
21 0x7f8e9205fc1a vtkStreamingDemandDrivenPipeline::Update(int, vtkInformationVector*) + 282
20 0x7f8e9201ffa6 vtkDemandDrivenPipeline::UpdateData(int) + 134
19 0x7f8e9205e859 vtkStreamingDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 953
18 0x7f8e92020fe6 vtkDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 310
17 0x7f8e9201e967 vtkDemandDrivenPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 55
16 0x7f8e920370a7 vtkReaderExecutive::CallAlgorithm(vtkInformation*, int, vtkInformationVector**, vtkInformationVector*) + 839
15 0x7f8e89d5f685 vtkDataReader::ReadMesh(int, int, int, int, vtkDataObject*) + 85
14 0x7f8e92039dcb vtkSimpleReader::ReadMesh(int, int, int, int, vtkDataObject*) + 91
13 0x7f8e89d721b8 vtkDataSetReader::ReadMeshSimple(std::string const&, vtkDataObject*) + 12376
12 0x7f8e9205fc1a vtkStreamingDemandDrivenPipeline::Update(int, vtkInformationVector*) + 282
11 0x7f8e9201ffa6 vtkDemandDrivenPipeline::UpdateData(int) + 134
10 0x7f8e9205e859 vtkStreamingDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 953
9 0x7f8e92020fe6 vtkDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 310
8 0x7f8e9201e967 vtkDemandDrivenPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 55
7 0x7f8e920370a7 vtkReaderExecutive::CallAlgorithm(vtkInformation*, int, vtkInformationVector**, vtkInformationVector*) + 839
6 0x7f8e89d5f685 vtkDataReader::ReadMesh(int, int, int, int, vtkDataObject*) + 85
5 0x7f8e92039dcb vtkSimpleReader::ReadMesh(int, int, int, int, vtkDataObject*) + 91
4 0x7f8e89dad9b8 vtkUnstructuredGridReader::ReadMeshSimple(std::string const&, vtkDataObject*) + 3528
3 0x7f8e91cd1bca vtkUnstructuredGrid::SetCells(int*, vtkCellArray*) + 506
2 0x7f8e91cd17d6 vtkUnstructuredGrid::SetCells(vtkUnsignedCharArray*, vtkCellArray*) + 1126
1 0x7f8e91ccdfd0 vtkUnstructuredGrid::DecomposeAPolyhedronCell(long long, long long const*, long long&, vtkCellArray*, vtkIdTypeArray*) + 176
0 0x7f8e99cf14c0 /lib/x86_64-linux-gnu/libc.so.6(+0x354c0) [0x7f8e99cf14c0]
( 8.902s) [paraview] :0 FATL| Signal: SIGSEGV
error: exception occurred: Segmentation fault

```

Can anyone help me out with this? I already achieved the correct visualization of the tessellation by using a POLYDATA vtk file, but I need to attach field data to the Voronoi cells, so I need an unstructured grid file for this. I checked the format and data consistency, and everything appears fine to me. You can find the file in the following link:

> **[Google Drive: Sign-in](https://accounts.google.com/v3/signin/identifier?continue=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1dfARUIGh2aesPd0GWlmWaAe0X5F00Pf0%2Fview%3Fusp%3Ddrive_link&followup=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1dfARUIGh2aesPd0GWlmWaAe0X5F00Pf0%2Fview%3Fusp%3Ddrive_link&ifkv=AeZLP99spXNDuL9Df_dnQ1Uzoa-vOOLYZI1NDc5T1Atw2NFn43zJvIfyldHo-w53BsxuVcLQwolknw&osid=1&passive=1209600&service=wise&flowName=GlifWebSignIn&flowEntry=ServiceLogin&dsh=S506611520%3A1735029771822729&ddm=1)**
>
> Access Google Drive with a Google account (for personal use) or Google Workspace account (for business use).

---

<div class="post-metadata">

### Author: ![nicolas.vuaille](https://discourse.paraview.org/user_avatar/discourse.paraview.org/nicolas.vuaille/32/5873_2.png) [@nicolas.vuaille](https://discourse.paraview.org/u/nicolas.vuaille)
#### Post date: [December 24, 2024, 8:45am UTC](https://discourse.paraview.org/t/vtk-unstructured-grid/15896/2 "2024-12-24T08:45:24Z")

</div>

Hi @Dario ,

Thanks for reporting but it seems that you shared a private link.

> [@Dario](#):
>
> so I need an unstructured grid

Not sure about that point. UnstructuredGrid only adds 3D cells support in comparison to PolyData. Can you detail what is not possible with polydata ?

---

<div class="post-metadata">

### Author: ![Dario](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/d/bc79bd/32.png) [@Dario](https://discourse.paraview.org/u/Dario)
#### Post date: [December 26, 2024, 5:00am UTC](https://discourse.paraview.org/t/vtk-unstructured-grid/15896/3 "2024-12-26T05:00:31Z")

</div>

Please try the following link, unfortunately, the file is too big to share it directly.  
[https://www.dropbox.com/scl/fi/g3hl2qfjxvxbjd1871w6m/voronoi\_tessellation.zip?rlkey=etvovffijrss0jk69jj2l6dbl&st=dypcdses&dl=0](https://www.dropbox.com/scl/fi/g3hl2qfjxvxbjd1871w6m/voronoi_tessellation.zip?rlkey=etvovffijrss0jk69jj2l6dbl&st=dypcdses&dl=0)

I need UnstructeredGrid because I have point data defined for each Voronoi cell that I need to visualize in Paraview, so if I used Polydata there would be a mismatch between the number of point data and polygons of the Voronoi cells.

---

<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 30, 2024, 12:50pm UTC](https://discourse.paraview.org/t/vtk-unstructured-grid/15896/4 "2024-12-30T12:50:14Z")

</div>

Im unable to reproduce the segfault using ParaView 5.13.1 linux binary release.

---

<div class="post-metadata">

### Author: ![Dario](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/d/bc79bd/32.png) [@Dario](https://discourse.paraview.org/u/Dario)
#### Post date: [January 14, 2025, 11:51pm UTC](https://discourse.paraview.org/t/vtk-unstructured-grid/15896/5 "2025-01-14T23:51:57Z")

</div>

Hi Mathieu, thanks for the answer. What does that mean practically? Is it the same error as mine?

---

<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [January 15, 2025, 7:23am UTC](https://discourse.paraview.org/t/vtk-unstructured-grid/15896/6 "2025-01-15T07:23:16Z")

</div>

It means that you should try with ParaView 5.13.1 and see if you still reproduce the issue.