[Paraview] Volume positioning

[padraig]

Dear list,

I have been having problems with the positioning of volumes using 
Paraview. ITK tells me that, using,

     IteratorType  it2( img_input, img_input->GetLargestPossibleRegion() );

     it2.GoToBegin();
     ImageType::IndexType begin = it2.GetIndex();
     img_input->TransformIndexToPhysicalPoint(it2.GetIndex(),p0);
     it2.GoToEnd();
     --it2;
     img_input->TransformIndexToPhysicalPoint(it2.GetIndex(),p1);
     std::cout << p0 <<  p1 << std::endl;

  two volumes I have have the positions


[-102.536, -106.413, 30.1491][102.512, 106.414, 177.564]

and

[-102.536, -106.413, 30.1491][102.512, 106.414, -117.265]

When I load these into Paraview they occupy the same volume. In Slicer3D 
the volumes are distinct as I expect above.

Thanks
Pádraig