[Paraview] casting vtkPointData* to double*

[Natalie Happenhofer]

Hi!
I´m writing a filter and I want to perform arithmetic operations, i.e. "+=" with the scalar data associated to each point of my grid. So I get the Point Data from the input file:

void vtkHorizontalAverage::Execute()
{vtkStructuredGrid *input = this->GetInput();
vtkStructuredGrid *output = this->GetOutput();

 vtkPointData *inPtr = input->GetPointData();
 vtkPointData *outPtr = output->GetPointData(); 
...

here and now I want to apply the += operator, but I have no idea how to cast my vtkPointData - object, since I do not really know where to fit the cast operator in, to the vtkPointData class or to the vtkDataArray.. 

I could also use a reinterpretcast, but I´m not sure if the format of the data in vtkPointData is double or float.. 

So, any help would be apreciated! 
thx,
NH



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