How to filter zombies for placement system tower defense

Help and Feedback Scripting Support
#1

i have a placement system i made a few hours ago, it works great, but i can place the towers on zombies, i tried using FilterDescendantsInstances to filter the entire enemy folder (the folder where all the alive enemies are in), but i get: Unable to cast value to Object

code:

local player = game.Players.LocalPlayer
local camera = workspace.CurrentCamera
local isPlacing = false
local mouse = player:GetMouse()
local uis = game:GetService("UserInputService")
local tower = game.ReplicatedStorage.Tower.GroundTower
local CurrentDecoy = nil

print(player:GetDescendants())

function decoy()
	local ray = RaycastParams.new()
	ray.FilterType = Enum.RaycastFilterType.Blacklist
	ray.FilterDescendantsInstances = {player.Character, game.Workspace.Enemies:GetChildren()}
	local unitRay = mouse.UnitRay
	local rayres = workspace:Raycast(unitRay.Origin, unitRay.Direction * 1000, ray)

	if rayres then
		print(rayres.Position)
		local Tower = tower:Clone()
		Tower.Parent = workspace
		Tower.Position = rayres.Position + Vector3.new(0, Tower.Size.Y/2, 0)
		Tower.Transparency = .5
		Tower.CanCollide = false
		return Tower
	end
	return nil
end

script.Parent.Activated:Connect(function()
	isPlacing = true
	CurrentDecoy = decoy()
end)

mouse.Move:Connect(function()
	if isPlacing == false  and CurrentDecoy == nil then return end
	local ray = RaycastParams.new()
	ray.FilterType = Enum.RaycastFilterType.Blacklist
	ray.FilterDescendantsInstances = {player.Character, CurrentDecoy, game.Workspace.Enemies:GetChildren()}
	local unitRay = mouse.UnitRay
	local rayres = workspace:Raycast(unitRay.Origin, unitRay.Direction * 1000, ray)

	if rayres then
		CurrentDecoy.Position = rayres.Position + Vector3.new(0, CurrentDecoy.Size.Y/2, 0)
	end
	
	uis.InputBegan:Connect(function(input)
		if input.UserInputType == Enum.UserInputType.MouseButton1 then
			local ray = RaycastParams.new()
			ray.FilterType = Enum.RaycastFilterType.Blacklist
			ray.FilterDescendantsInstances = {player.Character, CurrentDecoy, game.Workspace.Enemies:GetChildren()}
			local unitRay = mouse.UnitRay
			local rayres = workspace:Raycast(unitRay.Origin, unitRay.Direction * 1000, ray)
			
			if rayres then
				pcall(function()
					CurrentDecoy.Position = rayres.Position + Vector3.new(0, CurrentDecoy.Size.Y/2, 0)
					CurrentDecoy.Transparency = 0
					CurrentDecoy.CanCollide = true
					CurrentDecoy = nil
				end)
				
			end
			isPlacing = false
		end
	end)
end)

if you need more info just comment and i’ll give you some info.

#2

The FilterDescendantsInstances array should be filled with instances, but GetChildren returns an array of instances, not an instance. Try replacing game.Workspace.Enemies:GetChildren() with workspace.Enemies.

#3

Thank you, i didn’t know get children returned arrays lol