[vtkusers] Merging overlapping data sets

[Sunil Suram]

Hi,
I am new to VTK and I am looking for some help to try and figure this out. 
I am trying to merge two overlapping data sets. Each data set has slightly 
different scalars and vectors in the overlapping region( from experimental 
runs, that overlap each other ). I have tried using 
vtkExtractUnstructuredGrid, and switching on Merging, but I still see 
artifacts. I would like to know if there is some way of merging these data 
sets and getting rid of the artifacts. I should also mention that the grids 
in the data sets exactly match each other in the overlapping region.
I understand that merging the data sets would change the scalars and 
vectors in the overlap region in some way ( maybe undesired) , but that is 
OK for now, since I am right now interested in viewing the data.
Any help in solving this problem will be appreciated.
Thanks.
Sunil