Training Dummy

Lesson 5 of 25 in Coddy's Roblox Game: Battlegrounds course.

The dummy needs two things to be a training dummy: a health bar, and to come back when it is beaten.

Its HealthBar is a BillboardGui with a green Fill inside a dark Back. UDim2.fromScale(health / MaxHealth, 1) makes the fill as wide as the health left.

When its Humanoid Died, remember where it stood (GetPivot), remove it, wait Settings.DummyRespawn seconds and put a fresh copy from ServerStorage in its place. The fresh one needs the same setup, so the setup is a function that calls itself for the new dummy:

local function setupDummy(dummy)
	-- health bar, and on Died: ... setupDummy(fresh)
end
setupDummy(workspace.Dummy)

Challenge

Easy

Give the dummy a health bar and bring it back when beaten.

Write setupDummy(dummy): on HealthChanged, size dummy.HealthBar.Back.Fill to the health left.
On Died: keep dummy:GetPivot(), wait 0.5 seconds, destroy the dummy.
Then wait Settings.DummyRespawn, clone ServerStorage.Dummy to that pivot in workspace, and call setupDummy on it.
Call setupDummy(workspace.Dummy).

Press Play and beat the dummy: its bar empties, and it comes back. Then Check.

Try it yourself

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

local lastSwing = {} -- player -> when they last swung

-- Roblox's own sword animations
local slash = Instance.new("Animation")
slash.AnimationId = "rbxassetid://522635514"

print("Swords deal " .. Settings.SwordDamage .. " damage")

-- A swing: the animation, then everyone in the box in front of you is hit
local function swing(player)
	local character = player.Character
	local root = character and character:FindFirstChild("HumanoidRootPart")
	if not root or character.Humanoid.Health <= 0 then
		return
	end
	local now = time()
	if lastSwing[player] and now - lastSwing[player] < Settings.SwingCooldown then
		return
	end
	lastSwing[player] = now
	character.Humanoid.Animator:LoadAnimation(slash):Play()
	-- the box in front of you, never your own body
	local params = OverlapParams.new()
	params.FilterDescendantsInstances = { character }
	local box = root.CFrame * CFrame.new(0, 0, -3)
	local hit = {} -- each humanoid once per swing
	for _, part in workspace:GetPartBoundsInBox(box, Settings.HitboxSize, params) do
		local humanoid = part.Parent:FindFirstChildOfClass("Humanoid")
		if humanoid and not hit[humanoid] then
			hit[humanoid] = true
			humanoid:TakeDamage(Settings.SwordDamage)
			print(humanoid.Parent.Name .. " is at " .. humanoid.Health)
		end
	end
end

-- Every player gets a sword every life
Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function()
		local sword = ServerStorage.Sword:Clone()
		sword.Parent = player.Backpack
		sword.Activated:Connect(function()
			swing(player)
		end)
	end)
end)

-- Lesson 5: Training Dummy goes here