[vtkusers] vtkImageViewer2 is resetting the z spacing

[Mark Roden]

Hi all,

I have a medical image dataset that has a z spacing of 3.0 pixels (1.17 in
the x and y dimensions).  I'm using Java wrapping vtk and gdcm on 64 bit
windows 7.

I load the image using vtkGDCMImageReader and the IPPSorter, and in the end,
do this to set the proper z spacing:

          double[] spacing = new double[3];
          spacing = gdcmReader.GetOutput().GetSpacing();
          spacing[2] = sorter.GetZSpacing();
          imageData = gdcmReader.GetOutput();
          imageData.SetSpacing(spacing);

Then I try to load three views on the data with vtkImageViewer2.  The
following functions reset the z spacing to be 1.0:

vtkImageViewer2 imageViewer = new vtkImageViewer2();
imageViewer.SetInput(imageData); //resets z spacing to 1.0
imageData.SetSpacing(spacing); //attempt to fix

imageViewer.SetSlice((imageViewer.GetSliceMax() + imageViewer.GetSliceMin())
/ 2); //resets z spacing to 1.0
imageData.SetSpacing(spacing); //attempt to fix

//navigation slider on display
slider = new JSlider();
slider.setOrientation(JSlider.VERTICAL);
slider.setMinimum(imageViewer.GetSliceMin());//resets
slider.setMaximum(imageViewer.GetSliceMax());//resets
imageViewer.GetInput().SetSpacing(spacing);//attempt to fix

Even with all those attempts to fix, the XZ and YZ orientations still
display the image as if the z spacing is 1.0, instead of 3.0.

What's going on?  Why is vtkImageViewer2 changing ANYTHING to do with the
original image, rather than just straight up displaying what it's told to
display?

Thanks,
Mark
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