Decision Making - Learning Game AI Programming with Lua - page 377

Creating a decision tree agent
To create an agent whose logic is controlled by our decision tree, we'll modify our indirect
soldier agent, as the initial setup of an animation state machine and soldier controller is
already done for us.
We'll first create the userData table and associate the initial values so that our decision
tree can interact with the agent. Once we've populated the userData table, we can instan-
tiate our decision tree. We'll change the agent's update loop to process the decision tree as
well as the soldier controller. As our decision tree expects that the execution will end when
an agent dies, we'll add a conditional check that halts updates when this occurs:
IndirectSoldierAgent.lua :
local soldier;
local soldierController;
local soldierDecisionTree;
local soldierUserData;
function Agent_Initialize(agent)
Soldier_InitializeAgent(agent);
soldier = Soldier_CreateSoldier(agent);
weapon = Soldier_CreateWeapon(agent);
soldierController = SoldierController.new(
agent, soldier, weapon);
Soldier_AttachWeapon(soldier, weapon);
weapon = nil;
soldierUserData = {};
soldierUserData.agent = agent;
soldierUserData.controller = soldierController;
soldierUserData.maxHealth = soldierUserData.health;
soldierUserData.alive = true;
soldierUserData.ammo = 10;
soldierUserData.maxAmmo = 10;