[DGD] Coordinate systems, absolutes v relative v octree v nada

[Shentino]

I've been having internal debates about how to have coordinates set up.

I'm thinking of this system:

1.  Every object has xyz coordinates relative to the northwest upper
corner of its container
2.  Nodal containment implies complete physical containment
3.  leaving or entering the physical boudns of an object results in
automatic reparenting.

Anyone notice any flaws?