[vtkusers] two-sided rendering of wireframe?

[Luca Pallozzi Lavorante]

Hi everybody,

When I try to visualize a surface in wireframe mode, only one side gets
rendered with the proper color, while the other one is black. This doesn´t
happen when the object is rendered as a surface. I have tried enabling
Two-Sided lighting in the renderer, but  with no results.
Can somebody  help me  understand what  I am missing?

Thank you very much

            Luca
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