Make spear tween to mouse position?

[dockboy20006 (garfield)]

I am attempting to make a spear tween to the mouse position, like this:
https://gyazo.com/15b9ddb5a42da407627aede959fe8546

But I am not sure how I am able to do this with Ray and TweenService with Mouse.

Here is what happens to me:

ServerScript

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local TweenService = game:GetService("TweenService")
local Debris = game:GetService("Debris")

local spearEvent = ReplicatedStorage:WaitForChild('SpearEvent')
local mouseMoveEvent = ReplicatedStorage:WaitForChild('MouseMoveEvent')
local iceSpear = ReplicatedStorage:WaitForChild('IceSpear')

local maxDistance = 50
local goal = {}
local tweenInfo = TweenInfo.new(0.25)

local damage = 50

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local spearFolder = Instance.new("Folder", character)
		spearFolder.Name = 'SpearFolder'
	end)
end)

local function repeatSpears(player, mouseP)
	for i = 1, 4, 1 do
		local character = player.Character
		local cloned = iceSpear:Clone()
		local based = cloned.Inv
		cloned.Parent = player.Character.SpearFolder
		cloned.Name = "IceSpear"..i
		cloned:SetPrimaryPartCFrame(CFrame.new(character.Head.Position + Vector3.new(math.random(-2, 2), math.random(1, 4), math.random(-2, 2)), mouseP) 
		* CFrame.Angles(math.rad(0), math.rad(-90), 0))
	end
	wait(1)
end

local function spearCreate(player, mouseP, distance, origin, mouseHit)
	repeatSpears(player, mouseP)
	
	local spearRay = Ray.new(origin, (mouseP - origin).Unit * maxDistance)
	local hit, position = game.Workspace:FindPartOnRayWithIgnoreList(spearRay, {player.Character})
	local distance = (origin - mouseP).magnitude
	
	for i, v in pairs(player.Character.SpearFolder:GetChildren()) do
		if distance < maxDistance and hit and hit.Parent:FindFirstChild('Humanoid') then
			hit.Parent.Humanoid:TakeDamage(15)
		end
		
		goal.CFrame = v.Inv.CFrame * CFrame.new(-mouseHit.Position)
		local tween1 = TweenService:Create(v.Inv, tweenInfo, goal)
		tween1:Play()
		tween1.Completed:Wait()
		Debris:AddItem(v, 2.5)
		
	end
end

spearEvent.OnServerEvent:Connect(function(player, origin, mousePos, mouseHit)
	local spearRay = Ray.new(origin, (mousePos - origin).Unit * maxDistance)
	local hit, position = game.Workspace:FindPartOnRayWithIgnoreList(spearRay, {player.Character})
	local distance = (origin - mousePos).magnitude
	
	if distance < maxDistance and hit then
		spearCreate(player, mousePos, distance, origin, mouseHit)
	end 
end)

LocalScript

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local spearEvent = ReplicatedStorage:WaitForChild('SpearEvent')
local mouseMoveEvent = ReplicatedStorage:WaitForChild('MouseMoveEvent') 
local tool = script.Parent
local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:wait()
local mouse = player:GetMouse()
local used = false
local cooldown = 2.5 -- time between each shot

tool.Activated:Connect(function()
	if not used then
		used = true
		local origin = character:WaitForChild('Head').Position
		spearEvent:FireServer(origin, mouse.Hit.Position, mouse.Hit)
		wait(cooldown)
		used = false
	end
end)

[ToldFable (fable)]

If you’re ok with the spear going super fast (essentially making it unblockable/undodgeable)
you could do something like

OffsetCFrame = CFrame.Angles(0,math.rad(180),0) -- Play around with this
-- set the CFrame to the mousePos, make it face the original spear position, then rotate it 180 degrees
spear.CFrame = CFrame.new(mousePos,spear.Position)*OffsetCFrame

Making ranged weapons with proper projectiles can get a little tricky.
There are modules for this

Making a combat game with ranged weapons? FastCast may be the module for you!

Hey everybody!

Click to view key information for existing users

The module’s version is currently Ver 13.2.0 released on 12 November 2020** Changelogs can be viewed <a href="https://etithespirit.github.io/FastCastAPIDocs/changelog/">HERE</a> Support will only be given for the current version. Certain public toolkits that include FastCast may be using an out of date version. Please check the version in the main module (a comment near the top) before asking for help.

In thi…

If you wanna have a go at doing it yourself, I wouldn’t recommend using tweens. It’ll be more accurate if you just teleported the bullet each step of the way.

You’re basically taking the original raycast

and splitting it into sections

The bullet checks what’s immediatly infront of it

If there’s nothing there, it teleports (not tweens) to however far the raycast is and repeats the step

If something jumps in the way, or is in the way

The bullet teleports to where the ray intersected

If you tweened it then bullets might appear to go through things, depending on how slow the tween is.

I made my own module called Easy Bullet that’s a little easier to use than FastCast, but I haven’t released it to the public yet.
I could give it to you if you want.

[dockboy20006 (garfield)]

Interesting, how would I split the sections?

And would it look smooth if I split it into sections?

I just saw your edit, so I should just spawn it in, and use CFrame to move it, but use ray to detect damage?

[ToldFable (fable)]

Well, I guess you’re not actually splitting it as much as you’re taking it a step at a time.
Yea, that’s basically what you do.

I forgot to mention another layer of complexity: Collisions
If the raycast hits something with CanCollide set to false then you have to repeat that same raycast but add the thing to an ignore list. Otherwise, there’ll be a bug where the bullet goes through nonsolid objects and then through solid objects.