[vtkusers] vtkPDataSetToPolyDataFilter

[Karthik Krishnan]

Robbie:

vtkDataSetToPolyDataFilter has been deprecated. Its superseded by
vtkPolyDataAlgorithm and its subclasses. There is no way to represent a
vtkUnstructuredGrid as a vtkPolyData, since they have  representation
different structures.

You could also use a vtkGeometryFilter to extract the "polydata part", ie
all the 2D cells off the Unstructured grid; other cells will be ignored.

On Sat, Jan 29, 2011 at 1:02 AM, Robbie Banks <robbie.banks at gmail.com>wrote:

> Yep, I guessed that, but how do I go about it. The other ways I tried
> yielded as much success.
>
>
>
> R
>
>
>
> *From:* Karthik Krishnan [mailto:karthik.krishnan at kitware.com]
> *Sent:* Friday, January 28, 2011 11:13 AM
> *To:* Robbie Banks
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] vtkPDataSetToPolyDataFilter
>
>
>
>
>
> 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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