[vtkusers] Writing an Unstructured data to a VTK file

[the lily]

Hello,

I have some arrays storing the values of the data and I want to write it as a vtk file, the data is unstructured tetrahedrons

- Three arrays (X, Y, and Z) storing the coordinates
- An array (data) storing scalar field
- An array (ptIds) storing cell connectivity

I'm trying to pass the scalar field to vtkUnstructuredGrid but I get an error:

error: no member named 'SetInputData' in
      'vtkUnstructuredGrid'

This is the code I'm using

vtkSmartPointer< vtkPoints > points = vtkSmartPointer< vtkPoints > :: New();

vtkSmartPointer< vtkFloatArray > val = vtkSmartPointer< vtkFloatArray > :: New();

val->SetNumberOfComponents(1);


for(int i=0; i < npts; i++)

{

    points->InsertNextPoint(X[i], Y[i], Z[i]);
    val->InsertTuple1(i, data[i]);

}

vtkSmartPointer<vtkUnstructuredGrid> unstructuredGrid = vtkSmartPointer<vtkUnstructuredGrid>::New();
 unstructuredGrid->SetPoints(points);
unstructuredGrid->GetPointData()->SetScalars(val);

for(int i=0; i< ntets; i++)
      unstructuredGrid->InsertNextCell(VTK_TETRA, 4, ptIds[i]);


vtkDataSetWriter *w = vtkDataSetWriter::New();
w->SetFileTypeToASCII();
w->SetInputData(unstructuredGrid);
 w->SetFileName("data.vtk");
 w->Write();



What is the correct way to pass the scalar field?



-Thanks

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