How do I fix this issue with my gun not syncing movement with my arms?

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#1

I am currently working on a game where I have a mechanic that has your arms follow your mouse when you have a tool equipped. The tool is not following the arms. This is an issue with Motor6D, because my tool is not using a handle, and is rigged to the Torso, not the arm. How do I make it so that the tool also moves, even though it isn’t rigged to the arm? I’ve already tried looking through the dev forum but I couldn’t find an already-existing post regarding a similar issue.

Here is my code:

local defaultRightArmC0 = character:WaitForChild("Torso"):WaitForChild("Right Shoulder").C0
local defaultLeftArmC0 = character:WaitForChild("Torso"):WaitForChild("Left Shoulder").C0

local mouse = player:GetMouse()

local IsEquipped = false

game:GetService("RunService").RenderStepped:Connect(function()
	if IsEquipped == true then
		if character.Torso:FindFirstChild("Right Shoulder") then
			character.Torso["Right Shoulder"].C0 = character.Torso["Right Shoulder"].C0:Lerp(CFrame.new(1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), 1.55, 0, 0) , 0.1)
		end
		if character.Torso:FindFirstChild("Left Shoulder") then
			character.Torso["Left Shoulder"].C0 = character.Torso["Left Shoulder"].C0:Lerp(CFrame.new(-1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), -1.55, 0, 0) , 0.1)
		end
	elseif IsEquipped == false then
		character.Torso["Right Shoulder"].C0 = character.Torso["Right Shoulder"].C0:Lerp(defaultRightArmC0, 0.1)
		character.Torso["Left Shoulder"].C0 = character.Torso["Left Shoulder"].C0:Lerp(defaultLeftArmC0, 0.1)
	end
end)

game:GetService("RunService").RenderStepped:Connect(function()
	for i,v in pairs(character:GetChildren()) do
		if v:IsA("Tool") then
			IsEquipped = true
		else
			IsEquipped = false
		end
	end
end)

game.ReplicatedStorage.MovementEvent.OnClientEvent:Connect(function(otherPlayer, neckCFrame, rightShoulderCFrame, leftShoulderCFrame)
	local RightShoulder = otherPlayer.Character.Torso:FindFirstChild("Right Shoulder", true)
	local LeftShoulder = otherPlayer.Character.Torso:FindFirstChild("Left Shoulder", true)
	if RightShoulder then
		RightShoulder.C0 = rightShoulderCFrame
	end
	
	if LeftShoulder then
		LeftShoulder.C0 = leftShoulderCFrame
	end
	
end)
	
game:GetService("RunService").RenderStepped:Connect(function()
	game.ReplicatedStorage.MovementEvent:FireServer(character.Torso["Right Shoulder"].C0, character.Torso["Left Shoulder"].C0)
end)

Thanks.

3 Likes
#2

Is it necessary that the gun be attached to the torso? Couldn’t you simply attach it to the arm like a normal tool?

1 Like
#3

The way that I am handling animations is by having the gun rigged separately from the arm so that when I am animating, the handle will not move corresponding to the arm. That is why it is rigged to the Torso. Also, when I rigged it to the Right Arm, the weapon did move with the arms, but an attachment that is on the weapon which is important did not move along with the gun and arms.

1 Like
#4

maybe instead of rigging the gun to the torso, you could rig it to an invisible part inside of the torso, and sync that with arm movement instead?

1 Like
#5

just modify the C0 of the gun weld to the torso

copy-paste the C0 code for the right arm and left arm and make one for the gun motor,

perhaps something like this

		if character.Torso:FindFirstChild("Right Shoulder") then
			character.Torso["Right Shoulder"].C0 = character.Torso["Right Shoulder"].C0:Lerp(CFrame.new(1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), 1.55, 0, 0) , 0.1)
		end
		if character.Torso:FindFirstChild("Left Shoulder") then
			character.Torso["Left Shoulder"].C0 = character.Torso["Left Shoulder"].C0:Lerp(CFrame.new(-1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), -1.55, 0, 0) , 0.1)
		end
		if GunWeld then --Find GunWeld yourself, I don't know your gun setup
			GunWeld.C0 = GunWeld.C0:Lerp(CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), 0, 0), 0.1)
			--[[
			im not sure if this math is correct but considering your gun's C0
			is most likely going to be an Identity CFrame it should help
			]]--
		end
#6

So let me get this straight.

  1. The gun can’t be attached to the arm because the arm needs to animate separately from the gun
  2. You want the gun to move with the arm only when the arm moves along with the player’s mouse

It’s a little hard to understand what you are trying to achieve here, so forgive me if I got something wrong.

One other question. You’re talking a lot about rigging. Does the gun actually have joints?

1 Like
#7

Thank you, I will try this out later and tell you if it helped.

1 Like
#8

No, there is a Motor6D in the Torso, which has Part0 set to the Torso, and Part1 set to a fake “Handle” inside the gun.

#9

Unfortunately this happens if I do that.

#10

like I said, I was iffy on my cframe math, but it shows you’re on the right track, you just want the pivot of the arms and the pivot of the gun to be in the same position

last try from me, if this doesnt work then you’re gonna need to tinker with the cframe math

if character.Torso:FindFirstChild("Right Shoulder") then
			character.Torso["Right Shoulder"].C0 = character.Torso["Right Shoulder"].C0:Lerp(CFrame.new(1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), 1.55, 0, 0) , 0.1)
		end
		if character.Torso:FindFirstChild("Left Shoulder") then
			character.Torso["Left Shoulder"].C0 = character.Torso["Left Shoulder"].C0:Lerp(CFrame.new(-1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), -1.55, 0, 0) , 0.1)
		end
		if GunWeld then --Find GunWeld yourself, I don't know your gun setup
			GunWeld.C0 = GunWeld.C0:Lerp(CFrame.new(0, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), 0, 0), 0.1)
			--[[
			im not sure if this math is correct but considering your gun's C0
			is most likely going to be an Identity CFrame it should help
			]]--
		end

i am 90% sure this is just going to end up shifting your gun too far upwards, if it is too far upwards you can prolly just reconstruct the CFrame with the position shifted downwards

#11

What you said happened, but how do I tweak with the CFrame math for me to shift it downwards? If I change the Y value on the CFrame it still slides again.

#12

the y value is needed for the pivot point to be properly calculated, you just need to subtract 0.5 from the y axis after the rotation. doing CFrame - Vector3 results in it being calculated in world space. Since its still finding the target CFrame for the lerp we need to do it inside the lerp

		if character.Torso:FindFirstChild("Right Shoulder") then
			character.Torso["Right Shoulder"].C0 = character.Torso["Right Shoulder"].C0:Lerp(CFrame.new(1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), 1.55, 0, 0) , 0.1)
		end
		if character.Torso:FindFirstChild("Left Shoulder") then
			character.Torso["Left Shoulder"].C0 = character.Torso["Left Shoulder"].C0:Lerp(CFrame.new(-1, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y), -1.55, 0, 0) , 0.1)
		end
		if GunWeld then --Find GunWeld yourself, I don't know your gun setup
			GunWeld.C0 = GunWeld.C0:Lerp(CFrame.new(0, 0.5, 0) * CFrame.Angles(-math.asin((mouse.Origin.p - mouse.Hit.p).unit.y) - Vector3.new(0, 0.5, 0), 0, 0), 0.1)
			--[[
			when you add and subtract vectors from a CFrame the operations happen
			in "world space" which means the rotation of the CFrame is not taken into account
			]]--
		end

for more in depth CFrame math, Roblox’s documentation is extremely good

1 Like
#13

I got this error:

image
image1075×19 5.36 KB

#14

hello Articuno, I have a good solution for your problem, two solutions to be exact, gimme ur kord