[Paraview] Distributed source for image data

[Atanas Atanasov]

Hello.
i want to create a source plugin for the vtkImageData, which generates a 
distributed grid. The plugin now holds variables for entering the global 
offset, size and dimension. How should i set the extents on the 
different processes? Should i set the piece_id for the different pieces? 
At the end the data should be able to be processed by the distributed 
filters of paraview. Thank you for your help!
Regards,
A.Atanasov