A chromosome stores the information about a Behavior Tree in its entirety. More...

#include <BTChromosome.h>

Inheritance diagram for UBTChromosome:

Public Member Functions
void	RegisterInitialBTAsset (FString btAssetID)

FString	GetInitialBTAsset ()

const UBTCompositeNodeGene *	GetRoot () const

UBTCompositeNodeGene *	GetRoot ()

void	SetRoot (UBTCompositeNodeGene *node)

void	AddDecorator (UBTDecoratorGene *decorator)

int32	RemoveDecorator (UBTDecoratorGene *decorator)

int32	InsertDecorator (UBTDecoratorGene *decorator, int32 idx)

int	GetNumDecorators () const

UBTDecoratorGene *	GetDecorator (int idx) const

UBTChromosome *	Duplicate (UObject *outer)

FString	ToString ()

void	SetServiceInjector (UServiceInjector *serviceInjector)

void	ToLog ()

Detailed Description

A chromosome stores the information about a Behavior Tree in its entirety.

Author: npc

Date: 12/01/17

Each Chromosome represents a single Behavior Tree in gene form.

The Behavior Tree consists of a Root Node and a set of Root Decorators.

Under the Root Node Gene, you will find the rest of the tree.

The tree sturcture mirrors the structure of Unreal Engine Behavior Trees, and is as follows:

There are five node types:

BTCompositeNodeGene (This mirrors BTCompositeNode)
BTChildContainerGene (This mirrors BTCompositeChild)
BTTaskNodeGene (This mirros BTTaskNode)
BTDecoratorGene (This mirrors BTDecorator)
BTServiceGene (This mirrors BTService)

This current class is a BTChromosome, which does not mirror a Unreal Engine node. These objects represent a container for the root node, and have: 0 to many BTDecoratorGene, which are conditionals to be applied to the root node 1 BTCompositeNodeGene, which is the root of the tree

The root node is a BTCompositeNodeGene, these nodes have: 0 to many BTChildContainerGene, which act as containers for child noded 0 to many BTServiceGene, which run in the background during the execution of the composite node

Each child of a BTCompositeNodeGene is a BTChildContainerGene, which acts as a container for either a BTTaskNodeGene or a BTCompositeNodeGene, these nodes have: 0 to many BTDecoratorGene, which are conditions to be applied to their node 1 of: 'taskChild' of type BTTaskNodeGene 'compositeChild' of type BTCompositeNodeGene

A BTTaskNodeGene is an action for the artificial agent to execute, it can be anything from a move instruction, to a wait or play sound instruction. These are the leaf nodes of the behavior tree, and they have: 0 to many BTServiceGene, which run in the background during the execution of the task node

BTServiceGene nodes can sit on all BTCompositeNodeGene nodes or BTTaskNodeGene nodes, there can be any number.

BTDecoratorGene nodes can sit on all BTChildContainerGene nodes, there can be any number.

An example sketch of this version of behavior tree is as follows:

                     -                                             -
                     |    BTChromosome (Container for root node)   |
                     |                                             |
                     |            (BTDecoratorGene 1)              |
                     |            (BTDecoratorGene 2)              |
                     |                                             |
                     |                                             |
                     |        BTCompositeNodeGene (root)           |
                     |                                             |
                     |            (BTServiceGene 1)                |
                     -                                             -
                          ||                                ||   
                          ||                                ||
                          ||                                ||    
   -                          -                         -                          -          
   |  BTChildContainerGene 1  |                         |  BTChildContainerGene 2  |
   |                          |                         |                          |  
   |    (BTDecoratorGene 1)   |                         |    BTCompositeNodeGene   |                      
   |                          |                         -                          -
   |                          |                                     ||
   |      BTTaskNodeGene      |                                     ||
   |                          |                                     ||                                                      
   |    (BTServiceGene 1)     |                                     ||
   |    (BTServiceGene 2)     |                                     ||             
   -                          -                        -                          -
                                                       |  BTChildContainerGene 1  |
                                                       |                          |
                                                       |    (BTDecoratorGene 1)   |      
                                                       |    (BTDecoratorGene 2)   |      
                                                       |    (BTDecoratorGene 3)   |      
                                                       |                          |     
                                                       |      BTTaskNodeGene      |      
                                                       -                          -

The documentation for this class was generated from the following files:

Source/EvolvingBehavior/Public/Representation/BTChromosome.h
Source/EvolvingBehavior/Private/Representation/BTChromosome.cpp

Public Member Functions

Detailed Description