[vtkusers] Re: Setting the image orientation in vtkImageViewer

[Anja Ende]

Hi there,

I think I can do it with vtkImageReslice.

However, I am having problem trying to understand what the
SetResliceAxesDirectionCosines does. In particular, what should the matrix
look like if we set the slice orientation to say XZ or YZ.

I would be grateful if someone could explain what the matrix would look like
for these simple orientations.

Thanks,

Anja


On 18/08/06, Anja Ende <anja.ende at googlemail.com> wrote:
>
> Hi everyone,
>
> vtkImageViewer2 allows the user to set the slice orientation to XY, XZ and
> YZ planes. I am trying to implement the same functionality in
> vtkImageViewer.
>
> I call the SetExtent function on the input image data but it does not seem
> to have any effect in the displayed slice. It always displays the slice in
> the XY plane regardless of the extent values.
>
> So, I have something like:
>
> vtkImageData *input = this->GetInput();
>
> if (!input || !this->ImageMapper)
> {
>     return;
> }
>
> input->UpdateInformation();
> int *w_ext = input->GetWholeExtent();
>
> // Is the slice in range ? If not, fix it
> int slice_min = w_ext[this->m_sliceOrientation * 2];
> int slice_max = w_ext[this->m_sliceOrientation * 2 + 1];
>
> if (this->m_slice < slice_min || this->m_slice > slice_max)
> {
>     this->m_slice = static_cast<int>((slice_min + slice_max) * 0.5);
> }
>
> // Set the image actor
> switch (this->m_sliceOrientation)
> {
>     case MyViewer::SliceOrientation_XY:
>         input->SetExtent(
>                 w_ext[0], w_ext[1], w_ext[2], w_ext[3], this->m_slice,
> this->m_slice);
>         break;
>
>     case MyViewer::SliceOrientation_XZ:
>         input->SetExtent(
>                 w_ext[0], w_ext[1], this->m_slice, this->m_slice,
> w_ext[4], w_ext[5]);
>         break;
>
>     case MyViewer::SliceOrientation_YZ:
>         input->SetExtent(
>                 this->m_slice, this->m_slice, w_ext[2], w_ext[3],
> w_ext[4], w_ext[5]);
>         break;
> }
>
> However, it always renders the first slice in the XY plane. Any ideas on
> how to fix this?
>
> Thanks,
>
> Anna
>
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