Instantiate Behavior Tree

[zedz]

Hi Forum,

I have a question about instantiating BehaviourTree. The BehaviourTree was created in my resources folder, and I wish to start it in one of my custom action. I load the BehaviourTree like this:

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BehaviourTree dialogueMapper = Resources.Load<BehaviourTree>("DialogueMappers/" + NPCName);

But then when I start it:

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dialogueMapper.StartGraph(agent, blackboard, true, (bool obj) => { EndAction(obj);});

The console shows:
Graph: You have tried to start a graph which is an asset, not an instance! You should Instantiate the graph first.

My question is, how could I bind(or assign, whichever term we use) the BehaviourTree asset onto an empty gameobject using script? Is there something like: gameobject.addcomponent<BehaviourTree>().AssignAsset(behaviourTreeAsset)?

[Gavalakis]

Hello there,

As the log states, the BehaviourTree asset, needs to be instantiated before usage.
So what you can basically do is this:

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var dialogueMapperAsset = Resource.Load<BehaviourTree>("DialogueMappers/" + NPCName); var dialogueMapperInstance = Instantiate<BehaviourTree>(dialogueMapperAsset); dialogueMapperInstance.StartGraph(agent, blackboard, true, (bool obj) => { EndAction(obj); } ); //Remember to destroy the instance when no longer needed.

While the above will work, if you want to bind the asset to a gameobject more permanently, you can do something like this:

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var owner = go.AddComponent<BehaviourTreeOwner>(); owner.StartGraph( dialogueMapperAsset ); //this will assign and start the graph

Let me know if the above work for you 🙂
Thanks.

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[zedz]

Thank you very much! It works very well XD

[Author]

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