[Paraview] Combining pieces into one dataset?

[Thomas Ruedas]

Hi,
I am new to Paraview and try to put it to use for visualizing a certain 
kind of dataset that consists of two Pieces. The data are given in a 
.vtu file on the two identical subgrids of a so-called Yin-Yang grid 
with minimum overlap, which combine to form a spherical shell; 
essentially, the combined grid looks like a tennisball or baseball.
My problem is that the individual Pieces are shown nicely, and the whole 
dataset also looks correct, but at the boundary between the two Pieces, 
there is a gap, because Paraview doesn't interpolate between them. Is 
there a possibility in Paraview to combine the Pieces into one, so that 
the boundary disappears and everything looks smooth? I had tried to do 
that with Group Datasets, but that doesn't have any visible effect.
I am using Paraview 3.6.2 under Mac OS X Leopard.
Thomas
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Thomas Ruedas
Department of Terrestrial Magnetism
Carnegie Institution of Washington
http://www.dtm.ciw.edu/users/ruedas/