[vtkusers] Polydata input to filter is not set

[Nico Schertler]

Hi,

I am creating a filter that takes the result of a vtkDelaunay2D and creates a vtkImageData from that. Therefore, I chose the vtkImageAlgorithm as the base class for my filter and changed the input accordingly:

int MeshToRGBFilter::FillInputPortInformation(int port, vtkInformation* info)
{
       info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkPolyData");
       return 1;
}

I connect the filter to a vtkDelaunay2D like this:

vtkSmartPointer<vtkDelaunay2D> delaunay = vtkSmartPointer <vtkDelaunay2D>::New();
//...
MeshToRGBFilter* rgbFilter = new MeshToRGBFilter();
rgbFilter->SetInputConnection(delaunay->GetOutputPort());

The Delaunay filter definitely has an output. I confirmed that by rendering it.
In the filter, in RequestData, I want to access the polydata from the Delaunay pass like this:

int MeshToRGBFilter::RequestData(
       vtkInformation *vtkNotUsed(request),
       vtkInformationVector **inputVector,
       vtkInformationVector *outputVector)
{
       vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
       vtkPolyData* input = vtkPolyData::SafeDownCast(
             inInfo->Get(vtkDataObject::DATA_OBJECT()));

The input variable is then set to an instance of a vtkPolyData, but it contains just nothing:
[cid:image001.png at 01CDC7D7.72920280]

Is there something I might have missed? How can I access the poly data?

Nico
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