Making R6 rig arm point towards mouse on one axis

Help and Feedback Scripting Support
1

Hey! I’m working on a climbing game, but i’ve never been good at CFrame math stuff. In the game, you can hold M1 or M2 and the respective arm of your character will point towards it on a specific axis. I’m having trouble getting the arms to point correctly and not detach from the torso or glitch around.

My code if you need it (kind of rushed):

local Players = game:GetService("Players")
local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

local player = Players.LocalPlayer
local mouse = player:GetMouse()

local holdingM1 = false
local holdingM2 = false

-- Utility: Lock mouse target to player's Z-plane (2.5D)
local function getMousePositionOnPlane()
	local character = player.Character
	if not character then return Vector3.zero end

	local root = character:FindFirstChild("HumanoidRootPart")
	if not root then return Vector3.zero end

	local mousePos = mouse.Hit.Position
	return Vector3.new(mousePos.X, mousePos.Y, root.Position.Z)
end

local function Point_C0_To_Mouse(motor, worldCFrame)
	local part1CFrame = motor.Part1.CFrame
	local storedC0 = motor.C0
	local storedC1 = motor.C1

	local relative = storedC0 * storedC1:Inverse() * part1CFrame:Inverse() * worldCFrame * storedC1
	relative -= relative.Position

	return relative + storedC0.Position
end

-- 🔘 Input listeners
UserInputService.InputBegan:Connect(function(input, gpe)
	if gpe then return end
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		holdingM1 = true
	elseif input.UserInputType == Enum.UserInputType.MouseButton2 then
		holdingM2 = true
	end
end)

UserInputService.InputEnded:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		holdingM1 = false
	elseif input.UserInputType == Enum.UserInputType.MouseButton2 then
		holdingM2 = false
	end
end)

RunService.Stepped:Connect(function()
	local char = player.Character
	if not char then return end

	local torso = char:FindFirstChild("Torso")
	local leftArm = char:FindFirstChild("Left Arm")
	local rightArm = char:FindFirstChild("Right Arm")
	local leftShoulder = torso and torso:FindFirstChild("Left Shoulder")
	local rightShoulder = torso and torso:FindFirstChild("Right Shoulder")
	if not (leftShoulder and rightShoulder and leftArm and rightArm) then return end

	local mousePos = getMousePositionOnPlane()

	if holdingM1 then
		local aimCFrame = CFrame.lookAt(leftArm.Position, mousePos)
		leftShoulder.C0 = Point_C0_To_Mouse(leftShoulder, aimCFrame) * CFrame.Angles(0, 0, math.rad(90))
	end

	if holdingM2 then
		local aimCFrame = CFrame.lookAt(rightArm.Position, mousePos)
		rightShoulder.C0 = Point_C0_To_Mouse(rightShoulder, aimCFrame) * CFrame.Angles(0, 0, math.rad(-90))
	end
end)

Basically what I want (the arm movement):

2

bump, still working on this. any help is appreciated

3

how does it look now using your code? send a video

1 Like
4

5

make the camera 2d so it looks more accurate then send another video

6

basically the same result


i want the end of the arm (the hand technically) to move to the mouse pointer, or retract if the pointer is too close

7

bump again, i’d like to keep working on this

8

I think IKControl should work here? It’s instance based so it’ll probably still cause pain, but you should be able to get it to work somehow.

1 Like
9

sorta works now, i still need the arms to go inward when the mouse is close though

(i also need M2 to not lock the mouse)

1 Like
10

nvm it fixed itself somehow :+1: thanks

1 Like
11

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