[vtkusers] circle

[Renaud Isabelle]

Hi, 
 
I would like to draw a circle each time and where exactly the user clicks on my displayed image.
 
I saw examples to draw a sphere:
 
 vtkSphereSource* m_sphere = vtkSphereSource::New();
 vtkActor*  m_sphereActor = vtkActor::New();
 vtkPolyDataMapper* sphereMapper = vtkPolyDataMapper::New();
 sphereMapper->SetInput(m_sphere->GetOutput());
 m_sphereActor->SetMapper(sphereMapper);
 m_Renderer->AddActor( m_sphereActor );
 
But is there a way to draw a circle (that is empty disk and in 2D) instead of a filled sphere in 3D? Maybe  vtkSphereSource added to vtkActor2D could be a way?
 
I am not familiar with VTK for the moment, so, please, excuse me if this seems obvious....
 
Isabelle

		
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