Gun Raycast bullet visualization

[remote onyx]

Im currently learning about raycasting and i have this issue with the endpoint of the bullet raycast, as seen in the video when i shoot in the air the endposition of the bullet does not match the players cursor and i haven't found out how to fix it.

in the script below are my calculations to visualize the bullet:

local function applySpread(direction, spreadAmount)
    local spreadRadians = math.rad(spreadAmount)

    local spreadX = math.random() * spreadRadians - (spreadRadians / 2)
    local spreadY = math.random() * spreadRadians - (spreadRadians / 2)
    local spreadZ = math.random() * spreadRadians - (spreadRadians / 2)

    return (direction + Vector3.new(spreadX, spreadY, spreadZ)).Unit
end

local function visualizeBullet(muzzlePos, hitPoint, bullet)
    local direction = hitPoint - muzzlePos
    local length = direction.Magnitude

    local middlePoint = muzzlePos + direction * 0.5

    local bullet = Instance.new("Part")

    bullet.Size = Vector3.new(0.15, 0.15, length)
    bullet.CFrame = CFrame.new(middlePoint, muzzlePos + direction)

    tweenService:Create(bullet, TweenInfo.new(0.5, Enum.EasingStyle.Linear), {Transparency = 1}):Play()

    game.Debris:AddItem(bullet, 0.5)

    table.insert(excludedObjects, bullet)
end

fireEvent.OnServerEvent:Connect(function(player, muzzlePos, mousePos, spreadAmount)
    table.insert(excludedObjects, player.Character)

    local character = player.Character or player.CharacterAdded:Wait()
    local head = character:FindFirstChild("Head")

    local baseDirection = (mousePos - head.Position).Unit * 50
    local spreadDirection = applySpread(baseDirection, 70) * 50 

    local raycastParams = RaycastParams.new()
    raycastParams.FilterDescendantsInstances = excludedObjects
    raycastParams.FilterType = Enum.RaycastFilterType.Exclude

    local raycastResult = workspace:Raycast(head.Position, spreadDirection, raycastParams)

    local hitPoint    
    if raycastResult then
        hitPoint = raycastResult.Position
    else
        hitPoint = head.Position + spreadDirection
    end

    visualizeBullet(muzzlePos, hitPoint)
end)

i have left a few unnecessary parts out

i want it to like like in the game KAT
example below:

[fickle heath]

I think its because you use a different start position for your ray cast and your visualize function. The part should in theory still expand to your hitpoint. But because your hitpoint is infinitly far away the difference beetwen how the ray actually "travels" and how the visulize part looks like is way bigger.

This is just a theory but i am strongly believing that i am right.

[fickle heath]

Yeah in this clip the visualize part also starts at the head

[eternal ravine]

probably because of the spread

did you write the code?

or copy from a tutorial?

[remote onyx]

some parts are mine but the base is from a tutorial

[remote onyx]

it has nothing to do with the starting position

[fickle heath]

But think about it. When your part starts somewhere else and your ray starts somewhere else. The visualization of your ray will not be the same

as the rays path

[remote onyx]

yes this may be right, but ive seen other games with the same gun type where the visualized beam comes from the gun and the actual raycast from the head

because you that the hitpoint is infinitely far away, is it possible to just reduct it to its max range something like that

[fickle heath]

You can reduce the max range of your part but not the max range of the ray

the ray will travel as long as it doesn't hit something

[fickle heath]

And the clip you've send litterly shows the ray coming from the players head

[remote onyx]

yes it was just an example, some other games have its visualized raycast also coming from the muzzle of the gun, but the actual one from the head of the player. just visually more appealing

[fickle heath]

Well send a clip then

[remote onyx]

1 second

[remote onyx]

https://cdn.discordapp.com/attachments/1475587404919472311/1475866486571794442/2026-02-24_15-45-46.mp4?ex=699f0b46&is=699db9c6&hm=2ef7da0210def080976a6f79c4ef46624c95e14d58c8add8a2a7fdb0d917da58&

[fickle heath]

And how can you proof that the ray actually starts at the head?

[remote onyx]

if you are for example infront of a wall and aim to a point behind it which is not seeable from first person the visualized bullets endpoint is sort of going where the raycast has it an object

this is the same as in the game ive shown

there's no other way to replicate this

i just want to find out how to calculate to fix this infinitely far away hitpoint as you've mentioned

[fickle heath]

Well you could check if the length is bigger than your max distance. And then you can just set your parts length to your max distance.

But no that would still use the old direction of your infinitly far away hitpoint nvm

Maybe try creating a part at your max distance before shooting your ray so that your ray finds that part and your hitpoint isn't infinitly far away

Anyways I gotta go now tell me once you've got it or if it there is another problem

[remote onyx]

yeah ill try