[vtkusers] Fwd: Re: Extract Closed Polygons from vtkPolydata

[Ahmed Khaled]

Hi,

I have a 2D mesh as the grey one in the photo(the photo is attached) as an
stl i used  vtkFeatureEdges to extract and draw the green borders but i am
wondering how can I extract the inner and the outer green rectangles in 2
different vtkPolydata instances.

Is there any other way better than using vtkFeatureEdges?

the vtp file from the output of the vtkFeatureEdges
here is the code I wrote

void renderPoint(double* point, double[3] color, float opacity, float point
size)
{

 //Rendering code
  ...

}

void main()
{

vtkSmartPointer<vtkSTLReader> reader =
    vtkSmartPointer<vtkSTLReader>::New();
  reader->SetFileName("window.stl");
  reader->Update();

  auto polyData = reader->GetOutput();

  vtkSmartPointer<vtkFeatureEdges> featureEdges =
    vtkSmartPointer<vtkFeatureEdges>::New();
  featureEdges->SetInput(mFinitePolyData);
  featureEdges->BoundaryEdgesOn();
  featureEdges->FeatureEdgesOff();
  featureEdges->ManifoldEdgesOff();
  featureEdges->NonManifoldEdgesOff();
  featureEdges->ColoringOff();
  featureEdges->Update();

  mBoundaryPolyData = featureEdges->GetOutput();

  for (int i = 0; i < 10; ++i)
  {
    renderPoint(mBoundaryPolyData->GetPoint(i), blue, 1.0, 5.0);
  }

}
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