Need help road placement system

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#1
  1. What do you want to achieve? Keep it simple and clear!

I want to make a road placement system like in this video

  1. What is the issue? Include screenshots / videos if possible!
    my code is messed up and it glitched only scaled to -x and x, not z or -z and also the position changed

  2. What solutions have you tried so far? Did you look for solutions on the Developer Hub?

here is my code

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local selectedPart = nil
local defaultSize = Vector3.new(4, 1, 4)  
local previousDirection = nil

mouse.Button1Down:Connect(function()
	local target = mouse.Target
	if target and target:IsA("BasePart") then
		if selectedPart then
			selectedPart.SelectionBox:Destroy()
		end

		selectedPart = target
		previousDirection = nil

		local selectionBox = Instance.new("SelectionBox")
		selectionBox.Adornee = selectedPart
		selectionBox.Color3 = Color3.fromRGB(0, 255, 0)
		selectionBox.Parent = selectedPart
	end
end)


mouse.Move:Connect(function()
	if selectedPart then
		
		local mouseX = mouse.X
		local mouseY = mouse.Y
		local partPosition = selectedPart.Position
		local camera = workspace.CurrentCamera
		local unitRay = camera:ScreenPointToRay(mouseX, mouseY)
		local planePos = unitRay.Origin + (unitRay.Direction * (partPosition.Y - unitRay.Origin.Y) / unitRay.Direction.Y)

	
		local direction = planePos - partPosition

	
		local currentDirection
		if math.abs(direction.X) > math.abs(direction.Z) then
			currentDirection = "X"
		else
			currentDirection = "Z"
		end

	
		if previousDirection and previousDirection ~= currentDirection then
			local angle = 0
			if math.abs(direction.X) > math.abs(direction.Z) then
				if direction.X > 0 then
					angle = 0  -- Facing positive X
				else
					angle = math.pi  -- Facing negative X
				end
			else
				if direction.Z > 0 then
					angle = math.pi / 2  -- Facing positive Z
				else
					angle = -math.pi / 2  -- Facing negative Z
				end
			end
			selectedPart.CFrame = CFrame.new(partPosition) * CFrame.Angles(0, angle, 0)
		end

		previousDirection = currentDirection

		-- Calculate new size based on direction in steps of 1 stud along X axis
		local newSizeX = selectedPart.Size.X
		local partCFrame = selectedPart.CFrame

		if currentDirection == "X" then
			-- Scale in X direction in steps of 1 stud
			local targetSizeX = math.ceil(math.abs(direction.X))
			if targetSizeX % 2 ~= 0 then
				targetSizeX = targetSizeX + 1
			end
			newSizeX = targetSizeX

			-- Adjust the position to keep the part centered while resizing
			local offsetX = (newSizeX - selectedPart.Size.X) / 2
			partCFrame = partCFrame * CFrame.new(offsetX, 0, 0)
		end

		selectedPart.Size = Vector3.new(newSizeX, selectedPart.Size.Y, selectedPart.Size.Z)
		selectedPart.CFrame = partCFrame
	end
end)

mouse.Button2Down:Connect(function()
	if selectedPart then
		selectedPart.SelectionBox:Destroy()
		selectedPart = nil
	end
end)
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