Here's a really naive thought: Would it be possible to add an on-off switch to
the current light_group implementation, to either allow the 'global' shadows
(as-is), or to turn them off (for objects not in that light_group?)

My thinking is this: Since a light_group's LIGHT is already restricted to only
the group's objects, could the shadow calculations from the light also be
restricted like that? If so, we could choose which behavior to use-- 'the best
of both worlds', so to speak. And it wouldn't break backward compatibility.

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