[vtkusers] Error with vtkImagePlaneWidget

[Karthik Krishnan]

On Thu, Nov 5, 2009 at 7:44 AM, David Doria
<daviddoria+vtk at gmail.com<daviddoria%2Bvtk at gmail.com>
> wrote:

> On Thu, Nov 5, 2009 at 4:22 AM, RimAY <rim.ayari at gmail.com> wrote:
> > but i always get the error : ERROR: In
> > .\vtkImagePlaneWidget.cxx, line 1412 vtkImagePlaneWidget (01CA0550):
> > SetInput() before setting plane orientation.
>
> I tried to do the same thing you did but in c++ and I get the same
> error. I'm still apparently missing a big concept about how these
> widgets work - can anyone explain them at a very high level?
>
>    planeWidgetX->SetInput(Polydata);
>    planeWidgetX->SetPlaneOrientationToXAxes();
>

The widget expects an image data as input, as stated in the doxygen
documentation of the widget's SetInput method...

We should probably enforce that via a safedowncast in the SetInput method,
instead of invoking an error later..
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