[Paraview] cast from vtkDataSet to subclasses

[Natalie Happenhofer]

Hi!
Is there any possibility to cast from vtkDataSet to vtkRectilinearGrid or vtkStructuredGrid,....?
I´m writing a filter which should input vtkDataSet, it´s to say I have RectilinearGrid, StructuredGrid and StructuredPoint files with which the filter should work. 
I need to extract the dimensions from these DataSets, i.e use "GetDimensions(dims)" to implement my algorithm, so that´s why I´d need the downcast.. 
or is there any other possibility to get the dimensions of the input Dataset?

thx,
NH

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