How would I go about making an aim assist feature while in first person?

[Gettuse (Midtes)]

Basically all I need to know is how I could move the centered mouse to a specific location via scripts while in first person, kinda like how the player could move their camera around with their mouse.

[iscomessi8 (x_SubToxVoid879)]

I found this script from a youtube video

Add a local script in StarterGui

local Gui = game.Players.LocalPlayer:WaitForChild("PlayerGui")


local screenGui = Instance.new("ScreenGui", Gui)

local Button = Instance.new("TextButton")
Button.BackgroundTransparency = 1
Button.Size = UDim2.new(0, 0, 0, 0)

Button.Modal = true

Button.Parent = screenGui

This can now move your mouse in first-person.

This next script is made by @vsnry
It will lock your mouse in a certain position

@vsnry

This is exactly what you want:

-------------
--- INDEX ---
-------------

--Services
local userInputService = game:GetService("UserInputService")
local runService = game:GetService("RunService")

--Player & Character
local localPlayer = game:GetService("Players").LocalPlayer

--Other
local Camera = game:GetService("Workspace").CurrentCamera

--------------
--- VALUES ---
--------------

local xAngle = 0
local yAngle = 0
local cameraPos = Vector3.new(3.5,0,7.5)

----------------------
--- INITIALIZATION ---
----------------------

wait(1)
Camera.CameraType = Enum.CameraType.Scriptable
userInputService.MouseBehavior = Enum.MouseBehavior.LockCenter

-----------------
--- FUNCTIONS ---
-----------------

userInputService.InputChanged:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseMovement then
		xAngle = xAngle-input.Delta.x*0.4
		--Clamp the vertical axis so it doesn't go upside down or glitch.
		yAngle = math.clamp(yAngle-input.Delta.y*0.4,-80,80)
	end
end)

runService.RenderStepped:Connect(function()
	local Character = localPlayer.Character
	local rootPart = Character:FindFirstChild("HumanoidRootPart")
	if Character and rootPart then
		--Set rotated start cframe inside head
		local startCFrame = CFrame.new((rootPart.CFrame.p + Vector3.new(0,2,0)))*CFrame.Angles(0, math.rad(xAngle), 0)*CFrame.Angles(math.rad(yAngle), 0, 0)
		
		--Set camera focus and cframe
		local cameraCFrame = startCFrame + startCFrame:vectorToWorldSpace(Vector3.new(cameraPos.X,cameraPos.Y,cameraPos.Z))
		local cameraFocus = startCFrame + startCFrame:vectorToWorldSpace(Vector3.new(cameraPos.X,cameraPos.Y,-50000))
		
		Camera.CFrame = CFrame.new(cameraCFrame.p,cameraFocus.p)
	end
end)

This script is made to work inside StarterPlayerScripts, but you can also put it in PlayerGui or StarterPack.

[Ylsid]

1: Get the look vector of the camera (i.e. where the player is looking)
2: Get the unit vector of an object you want to aim assist at and the camera’s origin
3: Find the dot product between these two vectors. If it’s within a threshold, snap the player aim to the object, possibly with CFrame.LookAt

By adjusting the dot product to compare to, you can adjust the radius of aim assist.

[Gettuse (Midtes)]

Alright thanks, I put together this script to test out your method. I believe I did something wrong as I get around the same value at different spots. Could you check out what I did wrong?

local uis = game:GetService('UserInputService')

uis.InputBegan:connect(function(Input, g)
	if not g then
		if Input.UserInputType == Enum.UserInputType.MouseButton1 then
			local dir = workspace.CurrentCamera.CFrame.LookVector
			local part = workspace.TestPart.CFrame.LookVector
			local camorig = workspace.CurrentCamera.CFrame
			local camtopart = (camorig - part).LookVector
			local dotprod = camtopart:Dot(dir)
			print(dotprod)
		end
	end
end)

EDIT I was supposed to put part instead of dir when defining dot lol, my bad.

[Ylsid]

Nice, did it work like I expected?

[Gettuse (Midtes)]

Yes, I used Mouse.hit.p to compare positions instead of dot product as the value would change upon angles.

(Sorry for the late response lol, I barely use devforums)

[Ylsid]

Nice, good info, I’ll remember your implementation