[vtkusers] Re: orthogonal slices through a volume

[Amy Squillacote]

Hi Anja,

Since you want orthogonal slices, try using vtkImageClip. Use the 
SetOutputWholeExtent method to specify a slice in the volume; the 
minimum and maximum extent values will be the same along whatever axis 
you're taking the slice. Don't modify the extents for the other axes. 
For example, if your data's extents are 0 - 10 in x, 0 to 20 in y, and 0 
to 30 in z, then to extract the 5 slice along the x axis, you would call 
SetOutputWholeExtent with the parameters 5, 5, 0, 20, 0, 30.

- Amy

Anja Ende wrote:
> Hi Beau,
>
> Ya, I looked at that component but it uses a vtkPlaneSource object... 
> I was thinking that there must be an easier way to do this using the 
> vtkImageReslicer.
>
> Cheers,
> Anja
>
> On 21/08/06, *Anja Ende* <anja.ende at googlemail.com 
> <mailto:anja.ende at googlemail.com>> wrote:
>
>     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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