   handling of scene-graphs for extends worlds
  Where can I find documentation about the handling of scene-graphs for extends worlds like 'Grand Theft Auto' or 'Shadow of the Colossus'? I have found some things, like the 'making of sotc' but it doesn't have any reference to this aspect.   
  Im not sure what they do, but if you want a very large world, I would go with something like an octree. You can even make it a dynamically sized octree so that the world can be ade bigger or smaller as needed. If heigt is not a big concern in your game, you could even use a quadtree on the xz plane to save memory   