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http://altdevblogaday.org/2011/02/24/introduction-to-behavior-trees/

Obviously the most interesting article I found on this website. What do you think about it ?

It lacks some code example, don't you know any ? I also read that state machines are not very flexible compared to behaviour trees... On top of that I'm not sure if there is a true link between state machines and the state pattern... is there ?

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"State" just means the data that represents an object at that point. The "State Pattern" is a way to represent this state data in certain programming languages. And a "state machine" is a way to handle changes of behaviour based on an aspect of the object's state. This question should really be split into several because you're asking a few things that aren't very related. –  Kylotan Apr 23 '11 at 0:11
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up vote 15 down vote accepted

Behaviour trees are getting pretty big in the industry right now. Halo 3 uses them extensively for their AI (Halo 3 - Building a Better Battle).

Alex Champandard seems to be a big fan as well (Lots of articles on it on AIGameDev.com).

For code examples, take a look at:
http://magicscrollsofcode.blogspot.com/2010/12/behavior-trees-by-example-ai-in-android.html - The example is in Java, but self-explanatory)

To answer your latter question: State Machines: State Object versus sequential check: what are the pro/cons?

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Can anyone find the BT SDK from GameBrainsAI? –  gap Mar 21 '12 at 13:42
    
It looks like that project has disappeared, which is a shame. –  Ray Dey Jun 7 '12 at 0:32
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