> But could you coufirm at me, I'm not sure to understand well : the first > option that you suggest consists in storing the value on each node or cell > of each block, doesn't it ?
No. Every vtkStructuredGrid has 3 types of attributes: * PointData -- for each point * CellData -- for each cell * FieldData -- not associated with any thing. Just an arbitrary collection of attributes. FieldData can be accessed using vtkDataObject::GetFieldData() API. You can add an vtkDoubleArray with name (say RotationalSpeed) with a single tuple which is the speed for that block to this FieldData. Most filters simply pass through the field data, so it should be propagated from the reader through any intermediate filters to your filter which is actually making use of the rotational speed. Utkarsh _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview