The first - not comment - line in a legacy VTK file is free for the user and
can be used to mention, let us say, an approximation method to use with the
data for instance, at least I would like to use it for this purpose.
This line can be got back in a C++ code by using vtkDataReader::GetHeader().
Is it possible to get ot from the VTK dataset instead? since a filter has only
access to the data, not to the reader.
Or is it another (better) way to encode general information in a dataset? I
suppose vtkInformation can be used for this purpose but where does it appear in
a file?
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