[Paraview] slicing a large VTK_POLYHEDRON

[Mathieu Westphal]

Hello

for your information there is a bug in the slicing of vtkPolyHedron that
can cause a segfault.
It looks very much like your error. It has yet to be corrected.
https://gitlab.kitware.com/vtk/vtk/issues/16877

You can already test this "work in progress" branch to see if this fixes
your issue  :
https://gitlab.kitware.com/vtk/vtk/merge_requests/2304

You could of course modify your data to tetrahedron with tetrahedralize
filter.

Regards,

Mathieu Westphal

On Tue, Jan 3, 2017 at 4:10 PM, Pierre Van Hauwaert <
pierre at rtech-engineering.nl> wrote:

> Hi,
>
> I am using paraview to visualise my data. I generate my data using a
> combination of the 2 following types (
> <http://www.vtk.org/doc/nightly/html/vtkCellType_8h_source.html>
> http://www.vtk.org/doc/nightly/html/vtkCellType_8h_source.html)
> VTK_VOXEL
> <http://www.vtk.org/doc/nightly/html/vtkCellType_8h.html#ab1d6fd1f3177b8a2a32bb018807151f8a06a70888292dc4309e42404af594fbb4>
> = 11
> VTK_POLYHEDRON = 42 I can visualize that data with parview without a
> problem. But, because I ended up having a segfault without any error
> message when slicing (Z=0) the data. I decomposed my data in separate files
> for each VTK_POLYHEDRON in order to investigate the problem.
>
> I found out that only the polyhedrons with the largest size were having
> the problem. The limit is somewhere between the 2 files:
> - poly-F1000-2395.vtu : working: 466 points, 928 faces
> - poly-F1000-2987.vtu : segfault when slicing: 546 points, 1088 faces
>
> So my guess is that there is a limit for the number of points or the
> number of faces that can have the polyhedron (1024 ?) if I want to be able
> to use the slice function.
>
> My questions are :
> 1) Is there actually a limitation in Paraview (VTK?) regarding the number
> of faces or the number of the point that the slice function can handle for
> a polyhedron ?
> 2) If there is this limitation, is there an option to remove it in
> Paraview ? (specific version, compilation option, etc)
> 3) If there is this limitation, is there any work around that exist so I
> am able to slice my data ? For example a different format ?
>
>
> I attached the data to be able to back up my statement:
>
> poly-F1000-*.vtu : files describing a polyhedron each:
> poly-F1000.pvd : load all those files
>
> Biggest file for which the slicing works (size, name):
> 34K poly-F1000-2395.vtu
>
> The 8 biggest files triggering the crash when doing a slice: (size, name)
> 38K poly-F1000-2987.vtu
> 39K poly-F1000-2983.vtu
> 39K poly-F1000-2935.vtu
> 39K poly-F1000-2988.vtu
> 39K poly-F1000-2931.vtu
> 40K poly-F1000-2937.vtu
> 40K poly-F1000-2981.vtu
> 40K poly-F1000-2930.vtu
> fail.pvd: load those 8 files
>
> the other files can be sliced without any issues
>
>
> Thanks,
>
> Pierre
>
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