My script for my gun gets an error when I make the local direction variable.

[muted bobcat]

I was following a tutorial about raycast and in one part of the tutorial we make a gun for some reason I get an error "attempt to perform arithmetic (sub) on vector3 and instance." the error happens in local direction.

the big one is the server script where the error happens and the small one is the client script I don't think there is any error there but maybe

[mystic turtle]

** You are now Level 5! **

[west plover]

Which line gives the error?

[muted bobcat]

the local direction

local direction = (mousepos - origin).Unit * dist_mult

in the server script

[muted bobcat]

^^

[west plover]

Okay sk

.unit returns a vector3

But you do multi * vector3

Mabey try vector3.new(1,1,multi) * (balh).unit

Cant multiply a number with vector3

So turn number into vector3

[muted bobcat]

I will try

[muted bobcat]

also what is balh?

[west plover]

Blah* just the stuff you put ib

Im on mobile so i can only explain your fix

[muted bobcat]

sorry I don't know much about these stuff but what is ib?

[copper quartz]

local tool = script.Parent
local pointpart = tool:WaitForChild("Handle"):WaitForChild("Point")

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local firegun = tool:WaitForChild("firegun")

tool.Activated:Connect(function()
firegun:FireServer(pointpart.Position, mouse.Hit.Position)
end) put this in the tool in a local script

[muted bobcat]

I did

[copper quartz]

local scriot

[muted bobcat]

yeah

[copper quartz]

script

local tool = script.Parent
local firegun = tool:WaitForChild("firegun")

local dist_mult = 50
local excludeparts = {}

local function visualizeray(origin, direction)
local length = direction.Magnitude
local midpoint = origin + direction * 0.5

local newpart = Instance.new("Part")
newpart.Anchored = true
newpart.CanCollide = false
newpart.Material = Enum.Material.Neon
newpart.Color = Color3.fromRGB(255, 148, 61)
newpart.Size = Vector3.new(0.1, 0.1, length)
newpart.CFrame = CFrame.new(midpoint, origin + direction)
newpart.Parent = workspace

game.Debris:AddItem(newpart, 0.5)

end

firegun.OnServerEvent:Connect(function(player, origin, mousepos)
local direction = (mousepos - origin).Unit * dist_mult

local raycastparams = RaycastParams.new()
raycastparams.FilterDescendantsInstances = excludeparts
raycastparams.FilterType = Enum.RaycastFilterType.Exclude

local rayresult = workspace:Raycast(origin, direction, raycastparams)

if rayresult then
    print("Result found!", rayresult)
    visualizeray(origin, direction)
    rayresult.Instance.Color = Color3.fromRGB(0, 255, 217) -- Changes hit part color
else
    print("Result not found!")
    visualizeray(origin, direction)
end

end)

this one too

in the tool loca script

did it work?

[muted bobcat]

is in a server script but I'm sure that is right

if is in a local script it will not affect the server

[muted bobcat]

what is ib?

[copper quartz]

did it work

[muted bobcat]

nope

[copper quartz]

The error you're seeing —
attempt to perform arithmetic (sub) on Vector3 and Instance — is happening because you're trying to subtract a Vector3 (a position) from an Instance (an object like a Part), which isn't valid.

Let’s look at the relevant part of your server script:

firegun.OnServerEvent:Connect(function(player, origin, mousepos)
local direction = (mousepos - origin).Unit * dist_mult

You're expecting both origin and mousepos to be Vector3 values (positions), but one of them isn't — likely origin.

From your local/client script, this is the part where you call FireServer:

firegun:FireServer(pointpart.Parent, mouse.Hit.Position)

You’re passing:

pointpart.Parent (which is a Model or Tool, i.e., an Instance) as origin

mouse.Hit.Position (which is a Vector3) as mousepos

You need to send a Vector3 position instead of pointpart.Parent.

try that

that is the problem that i see

you understand

[muted bobcat]

thank you I was wrong about the pointpart small script