Enemy AI stops patrolling after player dies

[thebradman7]

Hey! I’m currently making a dungeon crawler and have been playing around with an enemy AI system I made. Currently, it works perfectly and has been implemented into monsters, undenounced to me that the enemy will stop patrolling (moving to random waypoints) the moment the person they’re chasing dies.

Problem: The AI breaks and refuses to move once the player they’re chasing dies. There is nothing being printed in the output menu.

Code:

local Enemy = script.Parent

local humanoid = script.Parent.Humanoid
local PathfindingService = game:GetService("PathfindingService")
script.Parent.PrimaryPart:SetNetworkOwner(nil)

-- Config Settings
local Config = Enemy:WaitForChild("Config")
local MinRange = 5
local CanPatrol = Config:WaitForChild("Patrols")

local function findTarget()
	local players = game.Players:GetPlayers()
	local maxDistance = 30 -- 10,000
	local nearestTarget

	for index, player in pairs(players) do
		if player.Character then
			local target = player.Character
			local distance = (script.Parent.HumanoidRootPart.Position - target.HumanoidRootPart.Position).Magnitude

			if distance < maxDistance then
				nearestTarget = target
				maxDistance = distance
			end
		end
	end

	return nearestTarget
end


local function getPath(destination)
	local pathParams = {
		["AgentHeight"] = 6,
		["AgentRadius"] = 5,
		["AgentCanJump"] = false
	}

	local path = PathfindingService:CreatePath(pathParams)

	path:ComputeAsync(Enemy.HumanoidRootPart.Position, destination.Position)

	return path
end

local function attack(target)
	local distance = (Enemy.HumanoidRootPart.Position - target.HumanoidRootPart.Position).Magnitude

	if distance > MinRange then
		humanoid:MoveTo(target.HumanoidRootPart.Position)
		humanoid.WalkSpeed = 10
	elseif distance <= MinRange then
		humanoid.WalkSpeed = 0
	else
		return
	end 
end



local function walkTo(destination)
	local path = getPath(destination)
	
	if path.Status == Enum.PathStatus.Success then
		for index, waypoint in pairs(path:GetWaypoints()) do
			local target = findTarget()
			if target then
				print("TARGET FOUND", target.Name)
				attack(target)
				break
			else
				humanoid:MoveTo(waypoint.Position)
				humanoid.MoveToFinished:Wait()
			end

		end
	else
		humanoid:MoveTo(destination.Position - (Enemy.HumanoidRootPart.CFrame.LookVector * 10))
	end
end

local function patrol()
	if CanPatrol.Value == true then
		local waypoints = Enemy.Parent:WaitForChild("PatrolPoints"):GetChildren()
		local randomNum = math.random(1, #waypoints)
		walkTo(waypoints[randomNum])
	else
		local target = findTarget()
		
		if target then
			attack(target)
		end
		
	end
end

while wait() do
	patrol()
end

If you wish to replicate this problem simply insert an R6 rig, make some parts in a folder called “PatrolPoints”, place both the PatrolPoints folder and the R6 rig into another folder naming it whatever you’d like, and inside of the R6 rig make a configuration called “Config” and make a bool called “Patrols” inside. Make sure to set it to true!

[BendsSpace]

@thebradman7

The AI breaks and refuses to move once the player they’re chasing dies

I would add print statements to your code to see where the code gets stuck (either at a line or in a loop).

My best guess for a fix would be to add code to filter out targets that don’t exist in workspace if your problem has something to do with the characters dying/being removed.

[2112Jay]

local function attack(target)
	if target and target:FindFirstChild("Humanoid") and target.Humanoid.Health > 0 then
		local distance = (Enemy.HumanoidRootPart.Position - target.HumanoidRootPart.Position).Magnitude

		if distance > MinRange then
			humanoid:MoveTo(target.HumanoidRootPart.Position)
			humanoid.WalkSpeed = 10
		else
			humanoid.WalkSpeed = 0
		end
	else
		patrol()
	end
end

[xdoxAlex123 (CHEESE LORD)]

Do you not reset the WalkSpeed after you set it to 0?

[thebradman7]

I’ve solved it now but the main problem was with the AI setting the walkspeed to 0 whenever the target returned nil (I.e. The player died and now it can’t track their position). I fixed it by doing this:

local function attack(target)
	local distance = (Enemy.HumanoidRootPart.Position - target.HumanoidRootPart.Position).Magnitude

	if distance > MinRange then
		humanoid:MoveTo(target.HumanoidRootPart.Position)
		humanoid.WalkSpeed = 10
	elseif distance <= MinRange and target.Humanoid.Health > 0 then
		humanoid.WalkSpeed = 0
	else
		humanoid.WalkSpeed = 10
	end 
end