If you didn’t know already, Halo: Reach has a vamped up version of Forge called Forge World.
This is truly what we’ve been waiting for in a machinima tool. We have a huge map (on the scale of Mombasa in ODST) with a huge number of places we can use and they’re all connected.
With a (finally) finely tuned forge mode. We can make maps. real maps. none of those crappy variants. None of that “hey this area looks nice how can we use it?”
Now it’s “Hey we need this space for this shot. let’s build it.”