Gun animations broken when moving torso

[SystemAltAccount]

So I have created a gun system. It works just fine but when I try to add a script that makes your waist move to your camera the animation bugs out and it looks like your arm is broken.

With script:

Without script:

I tried a lot of things but nothing seems to work. Tried different scripts, but nothing works.

Script:

wait()

local Ang = CFrame.Angles
local aSin = math.asin
local aTan = math.atan

local Cam = game.Workspace.CurrentCamera

local Plr = game.Players.LocalPlayer
local Mouse = Plr:GetMouse()
local Body = Plr.Character or Plr.CharacterAdded:wait()
local Head = Body:WaitForChild("Head")
local Hum = Body:WaitForChild("Humanoid")
local Core = Body:WaitForChild("HumanoidRootPart")
local IsR6 = (Hum.RigType.Value==0)
local Trso = (IsR6 and Body:WaitForChild("Torso")) or Body:WaitForChild("UpperTorso")
local Neck = (IsR6 and Trso:WaitForChild("Neck")) or Head:WaitForChild("Neck")
local Waist = (not IsR6 and Trso:WaitForChild("Waist"))

local MseGuide = true

local TurnCharacterToMouse = true

local HeadHorFactor = 1
local HeadVertFactor = 1
local BodyHorFactor = 1.5
local BodyVertFactor = 1.4


local UpdateSpeed = 0.5

local NeckOrgnC0 = Neck.C0	
local WaistOrgnC0 = (not IsR6 and Waist.C0)



Neck.MaxVelocity = 1/3

if TurnCharacterToMouse == true then
	MseGuide = true
	HeadHorFactor = 0
	BodyHorFactor = 0
end

game:GetService("RunService").RenderStepped:Connect(function()
	local CamCF = Cam.CoordinateFrame
	if ((IsR6 and Body["Torso"]) or Body["UpperTorso"])~=nil and Body["Head"]~=nil then	
		local TrsoLV = Trso.CFrame.lookVector
		local HdPos = Head.CFrame.p
		if IsR6 and Neck or Neck and Waist then	
			if Cam.CameraSubject:IsDescendantOf(Body) or Cam.CameraSubject:IsDescendantOf(Plr) then
				local Dist = nil;
				local Diff = nil;
				if not MseGuide then	
					Dist = (Head.CFrame.p-CamCF.p).magnitude
					Diff = Head.CFrame.Y-CamCF.Y
					if not IsR6 then	
					     Neck.C0 = Neck.C0:lerp(NeckOrgnC0*Ang((aSin(Diff/Dist)*HeadVertFactor), -(((HdPos-CamCF.p).Unit):Cross(TrsoLV)).Y*HeadHorFactor, 0), UpdateSpeed/2)
						Waist.C0 = Waist.C0:lerp(WaistOrgnC0*Ang((aSin(Diff/Dist)*BodyVertFactor), -(((HdPos-CamCF.p).Unit):Cross(TrsoLV)).Y*BodyHorFactor, 0), UpdateSpeed/2)
					else	
						Neck.C0 = Neck.C0:lerp(NeckOrgnC0*Ang(-(aSin(Diff/Dist)*HeadVertFactor), 0, -(((HdPos-CamCF.p).Unit):Cross(TrsoLV)).Y*HeadHorFactor),UpdateSpeed/2)
					end
				else
					local Point = Mouse.Hit.p
					Dist = (Head.CFrame.p-Point).magnitude
					Diff = Head.CFrame.Y-Point.Y
					if not IsR6 then
						Neck.C0 = Neck.C0:lerp(NeckOrgnC0*Ang(-(aTan(Diff/Dist)*HeadVertFactor), (((HdPos-Point).Unit):Cross(TrsoLV)).Y*HeadHorFactor, 0), UpdateSpeed/2)
						Waist.C0 = Waist.C0:lerp(WaistOrgnC0*Ang(-(aTan(Diff/Dist)*BodyVertFactor), (((HdPos-Point).Unit):Cross(TrsoLV)).Y*BodyHorFactor, 0), UpdateSpeed/2)
					else
						Neck.C0 = Neck.C0:lerp(NeckOrgnC0*Ang((aTan(Diff/Dist)*HeadVertFactor), 0, (((HdPos-Point).Unit):Cross(TrsoLV)).Y*HeadHorFactor), UpdateSpeed/2)
					end
				end
			end
		end
	end
	if TurnCharacterToMouse == true then
		Hum.AutoRotate = false
		Core.CFrame = Core.CFrame:lerp(CFrame.new(Core.Position, Vector3.new(Mouse.Hit.p.x, Core.Position.Y, Mouse.Hit.p.z)), UpdateSpeed / 2)
	else
		Hum.AutoRotate = true
	end
end)

Any help is appreciated.

[dthecoolest]

Try using this, one of my suspicions is that it is caused by the animation blending update.

Replication of old animation blending

This piece of code replicates the old animation blending system before the new engine update that changed how animations are blended using their respective weight. It is for those that prefer to keep the structure of their custom animation system without having to make extra modifications in their script. -- local script local plr = game.Players.LocalPlayer local char = plr.Character local hum = char:WaitForChild("Humanoid") local playingAnim = {} -- adds existing animations to the playingAni…

[SystemAltAccount]

That seemed to do it, thank you!