[vtkusers] overwriting point coordinate ingnored

[Martin Baumann]

Hi,

I want to change change geometry of a 2D grid to 3D, by replacing 
(x,y,0) by (x,y,some scalar value).

The code was:

  _zero_grid = vtkUnstructuredGrid::New();
  _zero_grid->DeepCopy(_reader->GetOutput());

I replaced this by:

  _zero_grid = vtkUnstructuredGrid::New();
  _zero_grid->DeepCopy(_reader->GetOutput());
  for (int i=0; i<_number_of_points; ++i)
  {
   _zero_grid->GetPoint(i)[2] = 77.7;           // THIS LINE SEEMS TO BE 
IGNORED!!!
    std::cout << i << ": " << _zero_grid->GetPoint(i)[2] << std::endl;
  }

But the output is still (x,y,0), should be (x,y,77.7).
How can this be?

Regards, M.B.
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