[vtkusers] switchOff lights in a vtkRenderer

[Francis Bouchet]

Hello,

I try to have my vtkRenderer looking as empty while I modify its content :
1. I tried to Remove my actors but when I add new ones, the zoom is so high
that the Renderer concentrates on
the origin of the scene.
2. I tried to switch off the light, but I do not succeed in getting the
Renderer lights pointer.

Could someone help me please ?

Thanks

Francis.