[vtkusers] Polyline width question...

[Mathieu Coursolle]

Hi VTK users,

I have a 2D scene in which I display a circle polydata generated using  
vtkRegularPolygonSource. I want the thickness to always be the same in  
pixels.

It works fine, except that I have some strange artifacts, like missing  
pieces in 4 opposite locations (see picture attached).

Is there anything wrong in this code?

Thanks!

Mathieu

vtkSmartPointer<vtkRegularPolygonSource> circleSource =  
vtkSmartPointer<vtkRegularPolygonSource>::New();
circleSource->SetCenter(0.0, 0.0, 0.0);
circleSource->SetNumberOfSides(360);
circleSource->SetNormal(0.0, 0.0, 1.0);
circleSource->SetRadius(15.0); // 15 mm radius
circleSource->SetGeneratePolygon(FALSE);
circleSource->SetGeneratePolyline(TRUE);
circleSource->Update();
			
vtkSmartPointer<vtkPolyDataMapper> circleMapper =  
vtkSmartPointer<vtkPolyDataMapper>::New();	
circleMapper->SetInput(circleSource->GetOutput());
			
vtkSmartPointer<vtkActor> circleActor =  
vtkSmartPointer<vtkActor>::New();
circleActor->SetMapper(circleMapper);
circleActor->GetProperty()->SetLineWidth(20); // 20 pixels thick
circleActor->GetProperty()->SetOpacity(0.9);

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