Knowledge Representation - Learning Game AI Programming with Lua - page 460

Flee position selection

Extracting the flee position calculation from SoldierActions_FleeInitialize
takes a bit more work but is just as easy. As the previous flee position calculations were us-
ing additional information on the userData structure, we can convert the use of userData
values into values provided by the blackboard directly.

SoldierKnowledge.lua :

function SoldierKnowledge_ChooseBestFleePosition(userData)
local sandbox = userData.agent:GetSandbox();
local enemy = userData.blackboard:Get("enemy");

local bestPosition;

if (enemy) then
local position;
local bestDistance = 0;
local enemyPosition = enemy:GetPosition();

-- Try 32 points, and pick the furthest point away

from

-- the current enemy.
for index=1, 32 do
position = Sandbox.RandomPoint(sandbox,

"default");

local distanceToAgent =
Vector.DistanceSquared(position,

enemyPosition);

if (bestDistance < distanceToAgent) then
bestDistance = distanceToAgent;
bestPosition = position;

end

end

else

-- Any position will work if the agent doesn't have