Behavior tree vs state machine
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Scripting state machines vs animation state machines are going to have very different constraints and end-goals. [edit] For example here is UE3's anim tree[1] editor vs Kismet[2].
Tree of BFT Groups In Farsite, these groups are organized into a tree. That was not an arbitrary decision. It reflects the fact that the file system itself is a tree of directories and files. The namespace tree is partitioned into regions, each of which is managed by a BFT group, such that...