[vtkusers] Anti-alias in lines drawn from a vtkUnstructuredGrid

[Christophe Franco]

I'm using a vtkUnstructuredGrid, with a vtkDataSetMapper and a vtkActor, 
to display line segments.

I need to display anti-aliased segments. How can I do it ? I've looked 
in the vtkProperty class, but couldn't find any option that does this.

Christophe Franco