[vtkusers] vtkImageReslice of volume initialized using vtkImagePlaneWidget data

[Darshan Pai]

Why dont you just retrieve the Reslice using .. GetResliceOutput()

On Wed, Mar 14, 2012 at 2:17 AM, Miguel Sotaquirá <msotaquira at gmail.com>wrote:

> Hello everybody,
>
> I have a 3D volume and I want to extract a set of 2D  radial oblique
> slices. In order to do so I need to define my initial slice, in terms of
> origin, normal and axes; this initial slice is obtained manually (using the
> same approach described in Examples/GUI/Qt/FourPaneViewer/ of vtk's devel
> version) from vtkImagePlaneWidget->GetResliceAxes(), which gives me
> a vtkMatrix4x4 "matrix" containing the origin and axes that define this
> slice (plane). I want to use this information to obtain an oblique slice
> from the 3D volume using this pipeline:
>
>    vtkSmartPointer<vtkImageReslice> reslicer
> = vtkSmartPointer<vtkImageReslice>::New();
>    reslicer->SetInputConnection( this->reader->GetOutputPort() );
>       // The input being the 3D volume
>    reslicer->SetOutputDimensionality(2);
>    reslicer->SetOutputSpacing...
>    ...
>    ...
>    reslicer->SetResliceAxes(matrix);
>
> Where "matrix" in the last line of code is obtained
>  with vtkImagePlaneWidget->GetResliceAxes(). I'm having troubles with this
> last line, since the 2D slice obtained does not contain any data (all
> black) and I think it is because "matrix" and my 3D volume do not share the
> same coordinate space.
>
> How to obtain the correct slice orientation within my 3D volume, using the
> world coordinates of the reslice matrix extracted from vtkImagePlaneWidget?
>
> Thanks for your suggestions,
> Miguel
>
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