The Upgrader

Lesson 10 of 18 in Coddy's Roblox Game: Factory Tycoon course.

The purple gate over the belt is the upgrader. It does not stop the ore (it is not CanCollide), but every ore that passes through it is worth double.

Touched can fire more than once for the same ore, for example if it stops and starts again, and doubling twice would be a bug players love and owners hate. So the upgrader marks each ore it has doubled with an attribute and skips marked ones:

if hit.Name == "Ore" and not hit:GetAttribute("Upgraded") then
	hit:SetAttribute("Upgraded", true)
	hit:SetAttribute("Value", hit:GetAttribute("Value") * 2)
end

The upgrader waits in ServerStorage until it is bought, but its Touched can be connected at the start: the connection stays with the part wherever it is, and Touched only fires once it is in the world.

Challenge

Medium

Connect items.Upgrader.Touched: when the part is named Ore and has no Upgraded attribute, set Upgraded to true, double its Value, and colour it purple (Color3.fromRGB(155, 89, 182)).

Press Play, buy the upgrader and watch your income double, then Check.

Try it yourself

local Players = game:GetService("Players")
local ServerStorage = game:GetService("ServerStorage")
local CollectionService = game:GetService("CollectionService")
local Debris = game:GetService("Debris")
local Settings = require(game.ReplicatedStorage.Settings)

local tycoon = workspace.Tycoon
local items = ServerStorage.TycoonItems
local owner = nil

print("Ore is worth " .. Settings.OreValue .. " Cash")

-- Every player gets Cash on the leaderboard
Players.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player

	local cash = Instance.new("IntValue")
	cash.Name = "Cash"
	cash.Parent = leaderstats
end)

-- The sign above the factory
local gui = Instance.new("SurfaceGui")
gui.Parent = tycoon.Sign

local signLabel = Instance.new("TextLabel")
signLabel.Name = "Status"
signLabel.Size = UDim2.fromScale(1, 1)
signLabel.BackgroundColor3 = Color3.fromRGB(25, 25, 35)
signLabel.TextColor3 = Color3.fromRGB(255, 255, 255)
signLabel.TextScaled = true
signLabel.Text = "Step on the green pad to claim this factory"
signLabel.Parent = gui

local function setSign(text)
	signLabel.Text = text
end

-- Ore: a small part worth Cash, dropped under a dropper
local function dropOre(dropper)
	local ore = Instance.new("Part")
	ore.Name = "Ore"
	ore.Size = Vector3.new(1, 1, 1)
	ore.Color = Color3.fromRGB(150, 150, 160)
	ore.Position = dropper.Position - Vector3.new(0, 2.5, 0)
	ore:SetAttribute("Value", Settings.OreValue)
	if math.random() < Settings.GoldChance then
		ore.Color = Color3.fromRGB(255, 200, 40)
		ore.Material = Enum.Material.Neon
		ore:SetAttribute("Value", Settings.OreValue * 5)
	end
	ore.Parent = workspace
	Debris:AddItem(ore, 20)
end

-- A dropper runs one loop, however often it is started
local function startDropper(dropper)
	if dropper:GetAttribute("Running") then
		return
	end
	dropper:SetAttribute("Running", true)
	task.spawn(function()
		while dropper:IsDescendantOf(workspace) do
			dropOre(dropper)
			task.wait(Settings.DropInterval)
		end
		dropper:SetAttribute("Running", nil)
	end)
end

-- The conveyor carries whatever rests on it
tycoon.Conveyor.AssemblyLinearVelocity = Vector3.new(Settings.BeltSpeed, 0, 0)

-- The collector turns ore into Cash
tycoon.Collector.Touched:Connect(function(hit)
	if hit.Name == "Ore" then
		local value = hit:GetAttribute("Value")
		hit:Destroy()
		if owner then
			owner.leaderstats.Cash.Value += value
		end
	end
end)

-- Put a bought item in the factory
local function build(item)
	item.Parent = tycoon.Built
	if item:HasTag("Dropper") then
		startDropper(item)
	end
end

-- Buying: the pad goes away and its item is built
local function buy(pad, player)
	if player ~= owner or pad.Parent ~= tycoon.Buttons then
		return
	end
	local cash = player.leaderstats.Cash
	local price = pad:GetAttribute("Price")
	if cash.Value < price then
		return
	end
	cash.Value -= price
	pad.Parent = ServerStorage
	build(items:FindFirstChild(pad:GetAttribute("Item")))
end

for _, pad in tycoon.Buttons:GetChildren() do
	pad.Touched:Connect(function(hit)
		local player = Players:GetPlayerFromCharacter(hit.Parent)
		if player then
			buy(pad, player)
		end
	end)
end

-- A price tag floats over every pad
for _, pad in tycoon.Buttons:GetChildren() do
	local tag = Instance.new("BillboardGui")
	tag.Name = "PriceTag"
	tag.Size = UDim2.fromOffset(160, 40)
	tag.StudsOffset = Vector3.new(0, 3, 0)
	tag.Parent = pad

	local label = Instance.new("TextLabel")
	label.Size = UDim2.fromScale(1, 1)
	label.BackgroundColor3 = Color3.fromRGB(25, 25, 35)
	label.BackgroundTransparency = 0.2
	label.TextColor3 = Color3.fromRGB(255, 255, 255)
	label.TextScaled = true
	label.Text = pad:GetAttribute("Label") .. ": $" .. pad:GetAttribute("Price")
	label.Parent = tag
end

-- Claiming: the first player to step on the pad owns the factory
local claimPad = tycoon.ClaimPad
claimPad.Touched:Connect(function(hit)
	local player = Players:GetPlayerFromCharacter(hit.Parent)
	if player and not owner then
		owner = player
		claimPad.Color = Color3.fromRGB(120, 120, 120)
		claimPad.Material = Enum.Material.SmoothPlastic
		setSign(player.Name .. "'s Factory")
		for _, dropper in CollectionService:GetTagged("Dropper") do
			if dropper:IsDescendantOf(workspace) then
				startDropper(dropper)
			end
		end
	end
end)