[vtkusers] vtkCellArray insertion

[Fred Fred]

There is probably something I did not understand in the management of vtkCellArray, despite I looked at the examples.
My code is below:

  printf("Before:\n");
  int npts, *sp;
  for (int st=0 ; stoutputLines->GetNumberOfCells() ; st++) {
    this->outputLines->GetCell(st, npts, sp);
    printf("st=%d npts=%d\n", st, npts);
  }
  this->outputLines->InsertNextCell(3);
  this->outputLines->InsertCellPoint(4);
  this->outputLines->InsertCellPoint(5);
  this->outputLines->InsertCellPoint(7);
  printf("After:\n");
  for (int st=0 ; stoutputLines->GetNumberOfCells() ; st++) {
    this->outputLines->GetCell(st, npts, sp);
    printf("st=%d npts=%d\n", st, npts);
  }

And the output here:

Before:
st=0 npts=98
After:
st=0 npts=98
st=1 npts=0

which means that my insertion has failed.
So where do I make a mistake?

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