CFrame.lookat doesnt work in ViewportFrame

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#1

Hi. I want to make a camera show models in viewportframe

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local infotower = script.Parent.Frame
local cam = Instance.new("Camera")
cam.CameraType = Enum.CameraType.Scriptable
infotower.ViewportFrame.CurrentCamera = cam
cam.Parent = infotower.ViewportFrame
wait(2)
--for i,v in pairs(ReplicatedStorage.Folder:GetChildren()) do
	local tower = ReplicatedStorage.Folder.Minigunner:Clone()
	tower.Parent = infotower.ViewportFrame.WorldModel
	tower.PrimaryPart.Position = Vector3.new(0,0,2)
	cam.CFrame = CFrame.lookAt((tower.PrimaryPart.Position+Vector3.new(-4, 0, 0)), tower.PrimaryPart.Position)
	local a = tower:FindFirstChild("Animations")
	if a then
		if a:FindFirstChild("Idle") then
			local anim = tower.Humanoid.Animator:LoadAnimation(a.Idle)
			anim.Looped = true
			anim:Play()
		end
	end
	wait(3)
--end

There is no bugs. but camera doesnt change it just stays in the starting position

image
image904×624 4.72 KB

i can see the model so the problem has to be with camera