Center Of M* viewer

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

local player = Players.LocalPlayer
if not player then return end

local character = player.Character or player.CharacterAdded:Wait()
local HumanoidRootPart = character:WaitForChild("HumanoidRootPart")

local function createAxis(name, color, size, orientation, meshOffset)
	local part = Instance.new("Part")
	part.Name = name
	part.Size = size
	part.Anchored = false
	part.CanCollide = false
	part.Massless = true
	part.Color = color
	part.Material = Enum.Material.Plastic
	part.TopSurface = Enum.SurfaceType.Smooth
	part.BottomSurface = Enum.SurfaceType.Smooth
	part.Transparency = 0
	part.Orientation = orientation
	part.Position = Vector3.new(0, 0, 0)

	local mesh = Instance.new("SpecialMesh")
	mesh.Name = "Mesh"
	mesh.MeshType = Enum.MeshType.Cylinder
	mesh.Offset = meshOffset
	mesh.Scale = Vector3.new(1, 1, 1)
	mesh.VertexColor = Vector3.new(1, 1, 1)
	mesh.Parent = part

	return part
end

local COMModel = Instance.new("Folder")
COMModel.Name = "CenterOfMass"
COMModel.Parent = HumanoidRootPart

local XAxis = createAxis("XAxis", Color3.fromRGB(255, 0, 0), Vector3.new(4, 0.5, 0.5), Vector3.new(0, 0, 0), Vector3.new(0, -0.424, 0))
XAxis.Parent = COMModel

local YAxis = createAxis("YAxis", Color3.fromRGB(0, 255, 0), Vector3.new(4, 0.5, 0.5), Vector3.new(0, 0, 90), Vector3.new(-0.424, 0, 0))
YAxis.Parent = COMModel

local ZAxis = createAxis("ZAxis", Color3.fromRGB(0, 0, 255), Vector3.new(4, 0.5, 0.5), Vector3.new(0, 90, 0), Vector3.new(0, -0.424, 0))
ZAxis.Parent = COMModel

for _, part in ipairs(COMModel:GetChildren()) do
	if part:IsA("BasePart") then
		part.CFrame = HumanoidRootPart.CFrame * (part.CFrame - part.Position)
		local weld = Instance.new("WeldConstraint")
		weld.Part0 = HumanoidRootPart
		weld.Part1 = part
		weld.Parent = HumanoidRootPart
	end
end

local rootWeldPart = XAxis

RunService.Heartbeat:Connect(function()
	if not rootWeldPart then return end
	local relativeCOM = rootWeldPart.CFrame:PointToObjectSpace(rootWeldPart.AssemblyCenterOfMass)
	XAxis.Mesh.Offset = relativeCOM
	YAxis.Mesh.Offset = Vector3.new(relativeCOM.Y, -relativeCOM.X, relativeCOM.Z)
	ZAxis.Mesh.Offset = Vector3.new(-relativeCOM.Z, relativeCOM.Y, relativeCOM.X)
end)