[vtkusers] vtkDataSetSurfaceFilter and vtkImageMarchingCubes cannot extract the right surface

[Xin Guan]

Hi,

I'm trying to extract the outer surface of a brain volume data. I tried both
vtkDataSetSurfaceFilter and vtkImageMarchingCubes (marching cubes
algorithm goes after thresholding and smoothing). However, neither of them
give the correct surface.

vtkDataSetSurfaceFilter will only give the volume bounding box surface --
well in some sense it IS the outer surface, just too out. Result remains the
same after thresholding.

vtkImageMarchingCubes gives a nice surface, but only the lower 1/4 part of
the volume. I read the vtkImageMarchingCubes documentation, but have no clue
why this would happen.

The data set is converted from ITK and should be okay. I manually
constructed it and got the same error.

I would appreciate any help.

- xin
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