>>whole scene for Inner_light. Do objects in other light_groups cast shadow
>>even if they are not lighted by the light_sources ?
> 
> Yup.
> 
> Objects being in separate light groups still cast shadows for all lights.

Here's why: the shadow is caused by the object the shadow is cast 
across, which is lit by all lights.  When the tracer looks up how much 
light is falling on the shadowed object, it doesn't need to know about 
the light-groups that some other object (which happens to be in the way 
of the light) is using.

So, you need to put the shadowed object in a complementary light-group 
or something instead.

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