[vtkusers] What is Current Light please?

[Régis BLANCHON]

Hi,

When I open my visualisation file .tcl I can see this error:
Can't read "Current Light" : no such file variable

Sometimes this error occors, sometimes not, I don't know
why. And in both cases, the program can run. 

If anyone knows what about it is, thanks...

Régis 
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