> But how should that work if the objects are in different levels of a CS
G
>  hierarchy - e. g. if the room is part of a difference, but the
> furniture in the room belongs to a union several levels higher (or even

> not at all to the same CSG object)?

I guess you could make a duplicate light group, but I think it would be 
far better to restructure your objects so they can all be put into the 
same light group.  You could then add that group to a union or whatever 
else you need.

-- 
-The Mildly Infamous Blue Herring

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