Hi !
That by itself is pretty darn cool because unlike most previous "get outside the map" antics, this resulted in the ability to wander a truly defined area with new roads, buildings, fountains, etc.
That's why i think those dark areas where completely "modelised" before they pose the missions beacons, and locked those useless areas next to that. And i said there's nothing in these areas, but it was actually quite fun to see that they were "here", and "unlike most previous "get outside the map" antics" , like you said
But, as you could see, there's nothing like objects (cars, bus, etc.) or symbols (glyphs, etc.) that could be helpful in your glyph research ..!
About drawing a "line through the map" : someone effectively mentionned on Bungie.net forums that, if we draw some lines going from one "glyphs columns room to another, and from the second to the third" it could make a perfect "V" ; then he draw another line which was supposed to show that a last columns room was supposed to be in the District 7.
Something like
that i remember.
But, if you look at those three district (and probably on district 2 ), you'll see that they are "the same" : same model, with same streets, same buildings, same places, disposed in the same way, etc. So i think this is just a random fact, not "wanted" by bungie.
If you look at the black districts 1 and 7, you'll see they are the same, to, and black areas in Districts 0 and 9 are the same (again !). So, in theory, if we find a way to go into black district 1, we could probably use the same method to go in the 7 one.
This note may help.
Good night for you ! (it's just 8:51AM in France, so
)
Tepec