[vtkusers] Light with VTK

[Rogério Silva]

Has someone an example of use vtkLight with positional lights?

I´m trying it but it´s not working (the scene remains completely dark).

Wich parameters I need to set to use a positional light?
How can I create a light that iluminate in all directions: if I put a
single light in the middle of a room, how can I iluminate all walls,
celling and floor ?

Thanks for any help,

Rogério