[vtkusers] vtkPDataSetToPolyDataFilter

[Karthik Krishnan]

On Sat, Jan 29, 2011 at 12:18 AM, Robbie Banks <robbie.banks at gmail.com>wrote:

> Can anyone see where this is going wrong?
>
>
>
> I have a scene where the even numbered actors are reflections of the data
> for the odd actors.
>
>
>
> I am trying to create a single vtkPolyData set with the ploydata for the
> whole scene. The reflections are created with a vtkReflectionFilter, which
> creates a vtkDataSet.
>
>
>
> I am trying to cast this vtkDataSet down and then convert it to vtkPolyData
> to be appended.
>
>
>
> The compiler is throwing an error when I try and create the
> vtkDataSetToPolyDataFilter saying:
>
>
>
> Error: invalid conversion from ‘vtkAlgorithm’ to
> ‘vtkDataSetToPolyDataFilter.
>
>
>
> I guess it doesn’t like being created with a vtkSmartPointer, but I don’t
> know how to fix it.
>

Its because vtkDataSetToPolyDataFilter is an abstract base class. It cannot
be instantiated by vtkSmartPointer's New.



>
>
> Thoughts?
>
>
>
> Robbie
>
>
>
> Code below:
>
>
>
> vtkSmartPointer<vtkAppendPolyData> pAppendData =
> vtkSmartPointer<vtkAppendPolyData>::New();
>
> int reflectedActor = 0;
>
> for(int i = 0; i < actors.size(); i++){
>
>       vtkSmartPointer<vtkActor> actor = actors[i];
>
>       if(actor->IsA("vtkActor")){
>
>             vtkSmartPointer<vtkPolyData> pPolyData =
> vtkSmartPointer<vtkPolyData>::New();
>
>             if(i==reflectedActor){
>
>                   vtkSmartPointer<vtkDataSet> pDataSet =
> vtkDataSet::SafeDownCast(actor->GetMapper()->GetInput());
>
>                   vtkSmartPointer<vtkDataSetToPolyDataFilter> pFilter =
> vtkSmartPointer<vtkDataSetToPolyDataFilter>::New();
>
>                   pFilter->SetInput(pDataSet2);
>
>                   pFilter->Update();
>
>                   pPolyData = pFilter->GetOutput();
>
>                   reflectedActor+=2;
>
>             }
>
>             else
>
>                   pPolyData =
> vtkPolyData::SafeDownCast(actor->GetMapper()->GetInput());
>
>             pAppendData->AddInput(pPolyData);
>
>       }
>
> }
>
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