[vtkusers] orthogonal slices through a volume

[Anja Ende]

Hi everyone,

I know this question has been asked before but I could not find an answer
that could have helped me, so I am asking again.

Well... I am trying to get the classic 3 orthogonal slices through a volume.
I know the vtkImageViewer2 provides this functionality but I cannot use that
component unfortunately.

I was trying to use the vtkImageReslicer to get the XZ plane through the
volume.

So, I tried setting up the matrix as follows:

vtkImageReslice * slicer = vtkImageReslice::New();
slicer->SetInput(imageChangeInformationP->GetOutput());
slicer->SetResliceAxesDirectionCosines(1, 0, 0, 0, 0, 1, 0, -1, 0);

Is this matrix correct if I want to get the XZ plane out of the volume? I
ask because some of the slices in the beginning and end seem bogus. The
vtkImageViewer2 does not show them when I set the orientation to XZ in the
vtk viewer.

Also, I noticed that the vtkImageViewer2 displays the volume nicely with
correct aspect ratio and all that... So, I tried using:

slicer->SetOutputSpacing(1.0, 1.0, 1.0);

This was shown in the example. However, this changes my extents and the
number of Z slices reduces.

I was wondering if someone can help me determine the correct matrix for
extracting these planes.

Thanks,

Anja
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