[vtkusers] Is vtkCutter thread-safe?

[Luca Pallozzi Lavorante]

Hi vtkusers,

I have tried to generate N slices from a vtkUnstructuredGrid using
vtkCutter and OpenMP. The code I used is below. slicePosition and
sliceNormals are arrays of planes' positions and normals, whereas polys is
an array of vtkPolyData used to store each cut for a later append operation
using vtkAppendPolyData.

#pragma omp parallel for
    for (size_t i = 0; i < numSlices; ++i) {
        vtkSmartPointer<vtkPlane> slice = vtkSmartPointer<vtkPlane>::New();
        slice->SetOrigin(slicePosition[i].x(), slicePosition[i].y(),
slicePosition[i].z());
        slice->SetNormal(sliceNormal[i].x(), sliceNormal[i].y(),
sliceNormal[i].z());
        slice->Modified();

        vtkSmartPointer<vtkCutter> cutter =
vtkSmartPointer<vtkCutter>::New();
        cutter->SetInputData(m_data);
        cutter->GenerateTrianglesOff();
        cutter->ReleaseDataFlagOn();
        cutter->SetCutFunction(slice);
        cutter->Update();

        vtkSmartPointer<vtkPolyData> poly =
vtkSmartPointer<vtkPolyData>::New();
        poly->DeepCopy(cutter->GetOutput());
        poly->Modified();
        polys[i] = poly;
    }


This code generates segmentation faults and I would like to know whether it
is safe to create and deal with a different instance of vtkCutter in
different threads, as I am trying to do with the macro '#pragma omp
parallel for'. What I am trying to do is to slice my dataset using a set of
parallel planes.

Thank you in advance for any help.

       Luca Pallozzi Lavorante
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