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The function of RequestInformation(...) is not needed?
- Nope - only RequestData. It is really terribly confusing. Here is everything I have been able to gather: http://www.vtk.org/Wiki/VTK/Examples/Developers . You only have to use functions other than RequestData, FillInputInformation, and FillOutputInformation if you derive directly from vtkAlgorithm, which you should only do in very rare cases. Most of the time I derive from vtkPolyDataAlgorithm, which implements all of the complicated functions for you so you only have to implement RequestData. daviddoria 21:21, 7 January 2011 (EST)