[vtkusers] how can I visualize a circular nut with VTK ?

[luciangoron]

http://www.nabble.com/file/p23540071/e.g.jpg e.g.jpg 

as in the image I uploaded...

I tried to do it with help of the vtkDiskSource class.. but I could not set
the center, or set the number o sides (to be smooth as a circle)

I also tried using vtkRegularPolygonSource class.. by visualizing two
circles (big one + small one) with the same center
the big one (with bigger radius) to be at 100% Opacity ( SetOpacity(1.0) )
the small one (with smaller radius) to be at 0% Opacity ( SetOpacity(0.0) )
but the Renderer show the Opacity of the big circle... as it actually should
be !

If anybody has a solution, please answer me...

Thank you in advance !
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