Bhop movement problem

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#1

hi i want to write a script that make player movement look like csgo
i was finding for a source or tutorial and i found this
https://adrianb.io/2015/02/14/bunnyhop.html

so i converted it to luau and trying to port it into roblox
i do not understand how it work, it giving me “nan vector” instead of normal vector

does anyone know the issue or something?

task.wait(1)

local ground_accelerate = 100 -- Replace with your desired value
local max_velocity_ground = 100 -- Replace with your desired value

local air_accelerate = 50 -- Replace with your desired value
local max_velocity_air = 75 -- Replace with your desired value

local v = Vector3.new()

local Human = script.Parent:WaitForChild("Humanoid")
Human.WalkSpeed = 0
Human.JumpPower = 0
Human.UseJumpPower = 0

local RootPart = script.Parent:WaitForChild("HumanoidRootPart")

local dt = 0

local function Dot(vec1, vec2)
	return vec1.X * vec2.X + vec1.Y * vec2.Y + vec1.Z * vec2.Z
end

local function Normalize(vec)
	local magnitude = (vec.X^2 + vec.Y^2 + vec.Z^2)^0.5
	return Vector3.new(vec.X / magnitude, vec.Y / magnitude, vec.Z / magnitude)
end

local function Accelerate(accelDir, prevVelocity, accelerate, max_velocity)
	local projVel = Dot(prevVelocity, accelDir) -- Vector projection of Current velocity onto accelDir.
	local accelVel = accelerate * dt -- Accelerated velocity in the direction of movement (assuming FixedUpdate is called every 0.016 seconds)

	-- If necessary, truncate the accelerated velocity so the vector projection does not exceed max_velocity
	if projVel + accelVel > max_velocity then
		accelVel = max_velocity - projVel
	end

	return prevVelocity + accelDir * accelVel
end

local friction = 5

local function MoveGround(accelDir, prevVelocity)
	-- Apply Friction
	local speed = prevVelocity.magnitude
	if speed ~= 0 then -- To avoid divide by zero errors
		local drop = speed * friction * dt
		prevVelocity *= math.max(speed - drop, 0) / speed -- Scale the velocity based on friction.
	end

	-- ground_accelerate and max_velocity_ground are server-defined movement variables
	return Accelerate(Normalize(accelDir), prevVelocity, ground_accelerate, max_velocity_ground)
end

local function MoveAir(accelDir, prevVelocity)
	-- air_accelerate and max_velocity_air are server-defined movement variables
	return Accelerate(Normalize(accelDir), prevVelocity, air_accelerate, max_velocity_air)
end

game:GetService("RunService").Heartbeat:Connect(function(dt2)
	dt = dt2
	
	if Human.FloorMaterial ~= Enum.Material.Air then
		RootPart.Velocity = MoveGround(Human.MoveDirection, Vector3.new(max_velocity_ground, 0 ,max_velocity_ground))
	else
		RootPart.Velocity = MoveAir(Human.MoveDirection, Vector3.new(max_velocity_air, 0 ,max_velocity_air))
	end
end)
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