How can I make the players arm point towards their mouse on one axis?

Help and Feedback Scripting Support
#1

You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve? Keep it simple and clear!
    I want players to be able to point their characters arm towards their mouse
  2. What is the issue? Include screenshots / videos if possible!
    I have found a way to do this but I only want their arm to rotate like this, which I can’t figure out. I don’t want them to be able to rotate their arm forwards or backwards, only in this motion. I also only want their right arm to move. I also want the motion to be limited to only go up to 180 degrees.

image
image908×416 8.77 KB

  1. What solutions have you tried so far? Did you look for solutions on the Developer Hub?
    I have tried a script that points the players arm to their mouse but it is on all axis
local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local plr = Players.LocalPlayer
local char = plr.Character
local mouse = plr:GetMouse()

local armOffset = char.UpperTorso.CFrame:Inverse() * char.RightUpperArm.CFrame

local armWeld = Instance.new("Weld")
armWeld.Part0 = char.UpperTorso
armWeld.Part1 = char.RightUpperArm
armWeld.Parent = char

RunService.Heartbeat:Connect(function()
	local cframe = CFrame.new(char.UpperTorso.Position, mouse.Hit.Position) * CFrame.Angles(math.pi/2, 0, 0)
	armWeld.C0 = armOffset * char.UpperTorso.CFrame:toObjectSpace(cframe)
end)
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#2

I also do not want it to be able to rotate in circles it should always be facing forward

#3

I can help you with this but I can’t tell what that picture is depicting.

You mean like this?

image

Or this?

image

#4

The first one where it only goes upwards sideways.

#5

Sorry for the unformatted response, I’m on mobile.

local lookVector = (HumanoidRootPart.Position - hit.Position).Unit
weld.C0 = CFrame.new() * CFrame.Angles(math.atan2(lookVector.Y,lookVector.X),0,math.pi/2)

Edit: It would be much easier for you to use the built-in arm Motor6D than create your own weld.

#6

I implemented this code and it looks like this, the arm sticks inside of the hrp and only rotates in circles not up and down.

image

#7

This seems to do what you wanted.

local player = game.Players.LocalPlayer
local char = player.Character
local uis = game:GetService("UserInputService")
local rs = game:GetService("RunService")
local rightShoulder: (Motor6D) = player.Character:FindFirstChild("RightShoulder", true)
local originalC1 = rightShoulder.C1

function getMouseDirection(): (Vector3)
	local mouseCoordinates: (Vector2) = uis:GetMouseLocation()
	local ray: (Ray) = workspace.CurrentCamera:ScreenPointToRay(mouseCoordinates.X, mouseCoordinates.Y, 300)
	
	return ray.Direction
end


rs:BindToRenderStep("pointRightArmAtMouse", 201, function()
	local maxAngle: (number) = math.rad(20)
	local mouseDirection: (Vector3) = getMouseDirection().unit
	local angleBetweenMouseVector = math.atan2(mouseDirection.Y, 1)
	local intensityAdjustment: (number) = 2
	
	-- Clamp the angle and multiply it against the intensity to better show movement
	angleBetweenMouseVector = math.clamp(angleBetweenMouseVector, 0, maxAngle) * intensityAdjustment
	
	-- Set the C1 of the right shoulder
	rightShoulder.C1 = originalC1 * CFrame.fromAxisAngle(Vector3.new(0,0,-1), angleBetweenMouseVector)
end)
#8

thank you so much but it seems to only go up if my mouse is over half of the screen is there anyway to make it always follow my mouse?

#9

No, it can’t “follow your mouse” because it has to be relative to something and this is a direction going the opposite than the mouse is pointing. It’s rotating sideways - the mouse is facing forwards.

You want it to be relative to the screen instead of the world? As in, where the mouse is on the screen?

#10

I want it to work like this but this is inverted. I want the players arm to always be pointing to where the player’s mouse is on their screen.

https://streamable.com/re1px1

#11

Yeah that’s a completely separate thing, but this should work. You can adjust the maximum height on the maxAngle variable.

local player = game.Players.LocalPlayer
local char = player.Character
local uis = game:GetService("UserInputService")
local rs = game:GetService("RunService")
local rightShoulder: (Motor6D) = player.Character:FindFirstChild("RightShoulder", true)
local originalC1 = rightShoulder.C1

rs:BindToRenderStep("pointRightArmAtMouse", 201, function()
	local maxAngle: (number) = math.rad(135)
	local screenSize: (Vector2) = workspace.CurrentCamera.ViewportSize
	local mouseCoordinates: (Vector2) = uis:GetMouseLocation()
	local centerCoordinates: (Vector2) = screenSize/2
	local difference: (Vector2) = mouseCoordinates - centerCoordinates
	local yCoordinateFromCenter: (number) = difference.Y
	local angle: (number) = -math.atan2(yCoordinateFromCenter, screenSize.Y/2)
	angle += math.pi/4
	local percentage: (number) = angle / (math.pi/2)
	local finalAngle: (number) = (maxAngle) * percentage
	---- Set the C1 of the right shoulder
	rightShoulder.C1 = originalC1 * CFrame.fromAxisAngle(Vector3.new(0,0,-1), math.clamp(finalAngle, 0, maxAngle))
end)
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