The "Is Large" option seems to be if that you tick it, if your character is far away you will be able to see it still. if something isn't large, once you're farther away it will just magically poof from your camera. Sorry, bad explanation. If you wanna see what I mean, take the same object and out them side by side and make one "Large". Then once in-game/testing run far away and see how good you can see them.
