[vtkusers] Why vtkContourFilter makes symmetric polydata asymetric?

[Bill Lorensen]

What about surf?

On Dec 5, 2017 4:13 PM, "alican" <alican1812 at hotmail.com> wrote:

> *myPolydata* is fully symmetric, *boundaryPoly *is still so, but
> cf->GetOutput() is not. Why?
>
>         vtkSmartPointer<vtkFeatureEdges> featureEdges =
> vtkSmartPointer<vtkFeatureEdges>::New();
>         featureEdges->SetInputData(*myPolydata*);
>         featureEdges->BoundaryEdgesOn();
>         featureEdges->FeatureEdgesOff();
>         featureEdges->ManifoldEdgesOn();
>         featureEdges->NonManifoldEdgesOff();
>         featureEdges->Update();
>
>         vtkSmartPointer<vtkStripper> boundaryStrips =
> vtkSmartPointer<vtkStripper>::New();
>         boundaryStrips->SetInputConnection(featureEdges->GetOutputPort());
>         boundaryStrips->SetJoinContiguousSegments(1);
>         boundaryStrips->Update();
>
>         // Change the polylines into polygons
>         vtkSmartPointer<vtkPolyData> boundaryPoly =
> vtkSmartPointer<vtkPolyData>::New();
>         boundaryPoly->SetPoints(boundaryStrips->GetOutput()->GetPoints());
>         boundaryPoly->SetPolys(boundaryStrips->GetOutput()->GetLines());
>
>         vtkSmartPointer<vtkSurfaceReconstructionFilter> surf =
> vtkSmartPointer<vtkSurfaceReconstructionFilter>::New();
>         surf->SetInputData(*boundaryPoly*);
>         surf->Update();
>
>         vtkSmartPointer<vtkContourFilter> cf =
> vtkSmartPointer<vtkContourFilter>::New();
>         cf->SetInputConnection(surf->GetOutputPort());
>         cf->SetValue(0, 0.1);
>         cf->Update();
>
>
>
>
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