[vtkusers] 2d slice of 3d array

[Ryan Murray]

Hi David,
Thanks a lot for the hint. It worked perfectly

The vtkImageData that comes out of GetResliceOutput() has a different number
of points than the input
In my case the input was 232x232x232 and the output was 256x256x1
I assume that it was scaled to the closest multiple of 2
Is there a way to control the output number or stepsize? Interpolating as
necessary?

Thanks
Ryan

On Tue, Mar 16, 2010 at 5:48 PM, David Feng <dfeng at cs.unc.edu> wrote:

> Check out the vtkImagePlaneWidget.  It's an arbitrarily
> orientable/translatable slice plane that resamples the data onto the
> plane interactively.  Check out the documentation for how to interact.
>  To use:
>
> // assume "reader" is a normal image reader with vtkImageData as output,
> // and you've set up your renderer/renderwindow/renderwindowinteractor as
> usual.
> // "iren" is a pointer to the interactor.
>
> vtkImagePlaneWidget* ipwidget = vtkImagePlaneWidget::New();
> ipwidget->SetInteractor(iren);
> ipwidget->SetInput(reader->GetOutput);
>
> You can get a pointer to the resliced image for processing using
> "ipwidget->GetResliceOutput()."
>
> If this doesn't do exactly what you want, look at
> vtkImagePlaneWidget's source code.  It has all you need for creating
> your own slice plane, resampling, etc.
>
> David
>
>
> On Tue, Mar 16, 2010 at 12:15 PM, Ryan Murray <rymurr at gmail.com> wrote:
> > Hi all,
> > I am trying to do something which I think should be straightforward.
> > I have a vtk image file which holds a large 3d array on a structured
> > rectilinear grid
> > The only part of the vtk file I want is a 2d slice in the x,y plane.
> > The problem is that the slice I want is not necessarily at a grid point
> and
> > the
> > grid I want to output is not necessarily on the same grid as the vtk
> file.
> >
> >
> > I have been able to successfully use vtkExtractVOI to extract a plane on
> teh
> > grid defined in the vtk file and obviously read in the vtk file
> > I really have no idea how to move the plane between z grid points or how
> to
> > resample the extracted grid
> >
> > I would appreciate any suggestions
> > Thanks
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