How to point with you arm to your exact mouse position?

Help and Feedback Scripting Support
#1

Hey guys! I hope you all do well, I’m trying to make a vote system like “Breaking Point” where you point with your arm and then you vote for a person to get killed, but I got a problem, when I try to script the “point your arm to mouse”, it doesn’t works as respected. The arm doesn’t points to where It’s the mouse exactly.

I tried doing it with a Tool, but it isn’t the same.

Here’s the screenshots:

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As you can see my arm goes more down than to the left, and I don’t know how to fix this problem.

I’ll appreciate a lot your help and you if you can give me a hand with this, thank you so much for reading and bye bye, have a nice day!

  • LocalScript:
local RunService = game:GetService("RunService")



local Player = game.Players.LocalPlayer

local PlayerMouse = Player:GetMouse()



local Camera = workspace.CurrentCamera



local Character = Player.Character or Player.CharacterAdded:Wait()

local Head = Character:WaitForChild("Head")

local Neck = Head:WaitForChild("Neck")



local Arm = Character:WaitForChild("RightUpperArm")

local Shoulder = Arm:WaitForChild("RightShoulder")



local Humanoid = Character:WaitForChild("Humanoid")

local HumanoidRootPart = Character:WaitForChild("HumanoidRootPart")



local NeckOriginC0 = Neck.C0

local ShoulderOriginC0 = Shoulder.C0



Neck.MaxVelocity = 1/3



RunService.RenderStepped:Connect(function()

	local CameraCFrame = Camera.CoordinateFrame



	if Character:FindFirstChild("UpperTorso") and Character:FindFirstChild("Head") then

		local ArmLookVector = Arm.CFrame.lookVector

		local HeadPosition = Head.CFrame.p



		if Neck and Shoulder then

			if Camera.CameraSubject:IsDescendantOf(Character) or Camera.CameraSubject:IsDescendantOf(Player) then

				local Point = PlayerMouse.Hit.p



				local Distance = (Head.CFrame.p - Point).magnitude

				local Difference = Head.CFrame.Y - Point.Y



				Neck.C0 = Neck.C0:lerp(NeckOriginC0 * CFrame.Angles(-(math.asin(Difference / Distance) ), (((HeadPosition - Point).Unit):Cross(ArmLookVector)).Y, 0), .5 / 2)

				Shoulder.C0 = Shoulder.C0:lerp(ShoulderOriginC0 * CFrame.Angles(-(math.asin(Difference / Distance)), (((HeadPosition - Point).Unit):Cross(ArmLookVector)).Y, 0), .5 / 2)

			end

		end

	end	

end)
#2

Ok so this problem might end up being a little bit more demanding than you think it is. Only way you can do this accurately is with something called IK animations. Its a dynamic way of animating a part with multiple joints so they line up naturally.
Video here:

Devforum tutorial here:

(And honestly, it’s a pain in the ass to make yourself and there are a lot of modules made by other programmers that you can use lol)

3 Likes
#3

I don’t find any that works like I want to, so I have to make it, but thanks!

1 Like
#4

There isn’t something that I can do to make it? I am an intermedium class scripter, I even don’t have the math requirements to do this, I’m gonna try to learn them, but I don’t understand what are they doing in the code lines that are in his script, what would you recommend to me to do in this situation with your experience? Thanks.

#5

To be honest the math requirement is not super super high (probably grade 10 or 11 highschool). And even then it’s just some trig. Egomoose made a tutorial on how it works (another roblox developer) and I found it super helpful. It’s 21 minutes long but if you watch the whole thing and understand/take notes you will get it pretty quick. Not much else I can really help with except maybe keep looking for an open source IK module that can fit your needs?

1 Like