[vtkusers] get actor content

[Sergi Dote]

Hello vtk users,

I am Sergi and I have a problem:

A need to draw a scene with a set of vtkLineSource objects. I pick some
object with an propPicker and this picker gives me a vtkOpenGLActor. When
pick a line of my scene, I need to obtain the vtkLineSource object for
change one of their points, it's my objective, but the picker returns a
vtkOpenGLActor. What can I do to convert the vtkOpenGLActor's content to
vtkLineSource for manipulate this line?

thanks a lot
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