[vtkusers] update Light Position

[youpie]

Hi,

I have linked an vtkSphereSource to a vtkLight.
In fact in my observer call back command, when I move the sphere, I do in
the same time a SetPosition on my vtkLight.
But the effect come only when my move is finished instead of doing it in
real time with moving.

I have already tested some method like Modified() on the light, the sphere,
the Interactor but nothing happening.

The sphere move in real time but not the Light !!

If someone have an idea !

Thanks in advance

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