How would I keep a hit box on a tweened part?

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,
#1

I’m trying to spawn a hitbox around my projectile but the hitbox stays at the first position instead of constantly moving with the projectile, I’ve tried weld constraints but that also didnt work,

local plr = game.Players.LocalPlayer
local char = script.Parent
local hum = char:WaitForChild("Humanoid")
local humRP = char:WaitForChild("HumanoidRootPart")

local RS = game:GetService("ReplicatedStorage")
local Debris = game:GetService("Debris")
local UIS = game:GetService("UserInputService")
local TS = game:GetService("TweenService")
local RunService = game:GetService("RunService")

local debounce = false
local CD = 0
local isActive = false

local tpRemote = RS.Remotes.Teleport

local mouse = plr:GetMouse()

local KEY = Enum.KeyCode.V

local raycastParams = RaycastParams.new()
raycastParams.FilterDescendantsInstances = {char}

local camera = workspace.CurrentCamera



local function throwKunai()
	
	local rayMaxDist = 1500
	local mousePos = UIS:GetMouseLocation()
	local rayOrigin = camera:ViewportPointToRay(mousePos.X, mousePos.Y)

	local raycastResult = workspace:Raycast(rayOrigin.Origin, rayOrigin.Direction * rayMaxDist)

	if raycastResult == nil then print("nil")
		return
	end
	
	
	local kunai = RS.FX.RaijinKunai:Clone()
	local kunaiPosition = humRP.Position
	kunai.Parent = workspace.Map.Ignore
	kunai.CanCollide = false
	kunai.Anchored = true
	kunai.CFrame = CFrame.lookAt(kunaiPosition, raycastResult.Position)  * CFrame.Angles(0, math.rad(-90), math.rad(90))

	local hitBox = Instance.new("Part")
	hitBox.Parent = kunai
	hitBox.Anchored = true
	
	
	local distance = (raycastResult.Position - kunaiPosition).Magnitude -- (Target Position - Object Position)
	local speed = 150
	
	local tweenTime = distance / speed
	
	local objHit = raycastResult.Instance
	
	local tweenInfo = TweenInfo.new(tweenTime, Enum.EasingStyle.Linear, Enum.EasingDirection.In)


	local kunaiDirection =  {Position = raycastResult.Position}

	local tweenKunai = TS:Create(kunai, tweenInfo, kunaiDirection)

	tweenKunai:Play()
	
	print(objHit)
	print("Pressed V")
	
end



UIS.InputBegan:Connect(function(inp, gpe)
	if gpe then return end
	if inp.KeyCode == KEY and not debounce then
		debounce = true
		throwKunai()		
		task.wait(CD)
		debounce = false
	end
end)
#2

Could you not tween the hitbox as well? Just tween it to wherever the projectile is going, and the hitbox should perfectly overlap the projectile.

#3

Put the projectile/Hitbox in a model and set a primary part after that you can tween the primary part to move both.

but IIRC, CFrame changes don’t really consider physics/collisions, so its probably better to use something like velocity, constraints or tween the .Position.

also for projectiles you shouldn’t even need a Hitbox, you can use things like raycasts for the hits and then the projectile can just be a visual.