Behavior tree implementation details

Posted by angryInsomniac on Game Development See other posts from Game Development or by angryInsomniac
Published on 2013-07-21T23:36:50Z Indexed on 2014/08/20 22:35 UTC
Read the original article Hit count: 259

Filed under:

behavior

|

tree

I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly).

However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while.

When is the tree in a behavior tree evaluated?

Furthermore:

If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ?

I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

© Game Development or respective owner

Related posts about behavior

Explicit behavior with checks vs. implicit behavior

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm not sure how to construct the question but I'm interested to know what do you guys think of the following situations and which one would you prefer. We're working at a client-server application with winforms. And we have a control that has some fields automatically calculated upon filling another… >>> More
Creating Custom Ajax Control Toolkit Controls

as seen on Stephen Walter - Search for 'Stephen Walter'
The goal of this blog entry is to explain how you can extend the Ajax Control Toolkit with custom Ajax Control Toolkit controls. I describe how you can create the two halves of an Ajax Control Toolkit control: the server-side control extender and the client-side control behavior. Finally, I explain… >>> More
Apply Behavior Driven Development to Ruby on Rails with Rspec

as seen on Internet.com - Search for 'Internet.com'
Applying the Behavior Driven Development (BDD) methodology to your Rails development takes you beyond traditional Test Driven Development. Learn how to do it with the Ruby-based BDD framework RSpec. >>> More
Seperating entities from their actions or behaviours

as seen on Game Development - Search for 'Game Development'
Hi everyone, I'm having a go at creating a very simple text based game and am wondering what the standard design patterns are when it comes to entities (characters, sentient scenery) and the actions those entities can perform. As an example, I have entity that is a 'person' with various properties… >>> More
Is context inheritance, as shown by Head First Design Patterns' Duck example, irrelevant to strategy pattern?

as seen on Programmers - Search for 'Programmers'
In Head First Design Patterns it teaches the strategy pattern by using a Duck example where different subclasses of Duck can be assigned a particular behavior at runtime. From my understanding the purpose of the strategy pattern is to change an object's behavior at runtime. Emphasis on "an" meaning… >>> More

Related posts about tree

JQGrid tree - passing additional parameters when tree is expanded

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a JQGRid tree. It loads data click by click, not all at once. Typically, JQGRid passes 4 standard tree parameters with each call - row (level, parent, is leaf, is expanded). How can I pass more parameters that I will take from the row being expanded? E.g. data from Name column should be passed… >>> More
AVL tree vs. B-tree

as seen on Stack Overflow - Search for 'Stack Overflow'
How is an AVL tree different from a B-tree? >>> More
Extjs: Tree, Selecting node after creating the tree

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a simple TreePanel. I would like to select a particular node upon loading it. The nodes are from a remote file (json). The tree is loading as expected. However, the node is not being selected. Firebug shows node as undefined. This perhaps because of the async property. But, I an unable… >>> More
Metalanguage like BNF or XML-Schema to validate a tree-instance against a tree-model

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi! I'm implementing a new machine learning algorithm in Java that extracts a prototype datastructure from a set of structured datasets (tree-structure). As im developing a generic library for that purpose, i kept my design independent from concrete data-representations like XML. My problem now… >>> More
Are there any B-tree programs or sites that show visually how a B-tree works

as seen on Stack Overflow - Search for 'Stack Overflow'
I found this website that lets you insert and delete items from a B-tree and shows you visually what the B-tree looks like: java b-tree I'm looking for another website or program similar to this. This site does not allow you to specify a B-tree of order 4 (4 pointers and 3 elements), it only lets… >>> More