local runService = game:GetService("RunService")
local startHeightFallDamage = 10
local damagePerHeight = 1
local humanoid = nil
local character = nil
local lastStepAir = false
local totalAirVecrticalDistance = 0
local lastGroundedPosition = Vector3.new(0,0,0)

local function reset()
	humanoid = nil
	character = nil
	totalAirVecrticalDistance=0
	lastGroundedPosition = Vector3.new(0,0,0)
end
runService.Heartbeat:Connect(function()
		if humanoid == nil or character == nil then
			print("waiting for character")
			return
		end
		if humanoid.FloorMaterial == Enum.Material.Air then
			totalAirVecrticalDistance = lastGroundedPosition.Y - character:FindFirstChild("HumanoidRootPart").Position.Y
			lastStepAir = true
			print("Air distance is: "..tostring(totalAirVecrticalDistance))
		else
			if lastStepAir and totalAirVecrticalDistance>startHeightFallDamage then
				local fallDamage = (totalAirVecrticalDistance-startHeightFallDamage)*damagePerHeight
				if fallDamage<1 then fallDamage = 1

				end
				print("Total fallen distance: "..tostring(totalAirVecrticalDistance))
				humanoid:TakeDamage(fallDamage)
			end
			lastGroundedPosition = character:FindFirstChild("HumanoidRootPart").Position
			lastStepAir = false
			totalAirVecrticalDistance = 0
		end

	end)

local function fallDamage(char)
	character =char
	humanoid = char.Humanoid
end
local function onPlayerAdd(player)
	player.CharacterAdded:Connect(fallDamage)
	player.CharacterRemoving:Connect(reset)
end
game.Players.PlayerAdded:Connect(onPlayerAdd)