[vtkusers] 2d slice of 3d array

[Ryan Murray]

I figured as much about the spacing and step size
It isn't a disaster; 2^n grid size is in the end convenient for my
application
Thanks again for your help

Ryan

On Wed, Mar 17, 2010 at 4:26 PM, David Feng <dfeng at cs.unc.edu> wrote:

> You're probably right about the scaling, just to make texturing quick.
>  Position and size of the plane you can control, but I don't think
> spacing and step size are exposed.  You'll probably have to write your
> own version of the class if you want that level of control,
> unfortunately.
>
> David
>
> On Wed, Mar 17, 2010 at 9:28 AM, Ryan Murray <rymurr at gmail.com> wrote:
> > 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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> >>
> >> --
> >> http://www.cs.unc.edu/~dfeng <http://www.cs.unc.edu/%7Edfeng>
> >
> >
>
>
>
> --
> http://www.cs.unc.edu/~dfeng <http://www.cs.unc.edu/%7Edfeng>
>
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