[vtkusers] vtkTransformPolydataFilter ... how to get the transformed results

[David Doria]

>
> Hello everybody,
>
> I have a vtkLineSource object L1. I apply a transformation with the
> vtkTransformPolyDataFilter tpd.
>
> so... as L1 is defined by 2 points, I have a transform TT which defines the
> TransformPolyDataFilter.
> So I need to retrieve those 2 points but after the transform, so I call:
>
> vtkSmartPointer<vtkLineSource> tmplineDir =
> vtkLineSource::SafeDownCast(tpd->GetOutput());
>
> but the pointer it returns is NULL, causing of course a crash of the
> software.
> what am I missing? :)
>
> Many thanks.
> Giancarlo
>
>
>
You can't cast a polydata as a lineSource, which you are trying to do with
vtkLineSource::SafeDownCast(tpd->GetOutput());

The output of tpd is a polydata, so you'd want to do
vtkSmartPointer<vtkPolyData> output = tpd->GetOutput();

~David
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