[vtkusers] Problem of ShallowCopy with vtkWindowedSincPolyDataFilter

[Yang, Jinzhong]

Hi All,

I have a problem when I use ShallowCopy to copy data from the output of
vtkWindowedSincPolyDataFilter. Following is my code:

    vtkPolyData* InterimOutput;
    .
    .
    vtkWindowedSincPolyDataFilter* smoother =
vtkWindowedSincPolyDataFilter::New();
    smoother->SetInput(InterimOutput);
    smoother->GenerateErrorVectorsOn();
    smoother->NormalizeCoordinatesOn();
    smoother->BoundarySmoothingOn();

    smoother->SetNumberOfIterations(this->NumberOfSmoothingIterations);
    smoother->SetFeatureEdgeSmoothing(this->SmoothingFeatureEdge);
    smoother->SetFeatureAngle(this->SmoothingFeatureAngle);
    smoother->SetEdgeAngle(this->SmoothingEdgeAngle);
    smoother->SetPassBand(this->SmoothingPassBand);
    smoother->Update();

    InterimOutput->Reset();
    InterimOutput->ShallowCopy(smoother->GetOutput()); <--The data in
smoother cannot be copied to InterimOutput

While I use vtkPolyDataNormals after the smoothing, then the ShallowCopy is
fine:
    .
    .
    vtkWindowedSincPolyDataFilter* smoother =
vtkWindowedSincPolyDataFilter::New();
    smoother->SetInput(InterimOutput);
    smoother->GenerateErrorVectorsOn();
    smoother->NormalizeCoordinatesOn();
    smoother->BoundarySmoothingOn();

    smoother->SetNumberOfIterations(this->NumberOfSmoothingIterations);
    smoother->SetFeatureEdgeSmoothing(this->SmoothingFeatureEdge);
    smoother->SetFeatureAngle(this->SmoothingFeatureAngle);
    smoother->SetEdgeAngle(this->SmoothingEdgeAngle);
    smoother->SetPassBand(this->SmoothingPassBand);
    smoother->Update();

    vtkPolyDataNormals * normals = vtkPolyDataNormals::New();
    normals->SetInputConnection(smoother->GetOutputPort());
    normals->SetFeatureAngle(this->PolyNormalsFeatureAngle);
    normals->Update();

    InterimOutput->Reset();
    InterimOutput->ShallowCopy(normals->GetOutput()); <-- The data here can
be copied successfully
    
Could anybody help me solve this problem? I need to copy the data directly
from vtkWindowedSincPolyDataFilter. 
Thanks a lot!

Jinzhong

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