[vtkusers] vtkSeedWidget and vtkImageViewer2

[Yixun Liu]

Hi,

When I use vtkSeedWidget with vtkImageViewer2, I found the world coordinate
is not as what I expected.
For example, in the first slice (Z directioin with index 0), I set one seed.
However, I found the Z coordinate is not zero. The data has origin with
zero and so the coordinate of Z componene should be zero.

Any advices are appreciated.

Yixun
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