# Question On Look Vector and :Inverse()

How come this:

``````local cf = CFrame.new(-8, 0.5, 36, -1, 0, 8.94072443e-08, 0, 1, 0, -8.94072443e-08, 0, -1)

print(cf.LookVector)

--prints : -8.9407244274753e-08, -0, 1
``````

Is the same as this:

``````local cf = CFrame.new(-8, 0.5, 36, -1, 0, 8.94072443e-08, 0, 1, 0, -8.94072443e-08, 0, -1)

print((cf - cf.Position):Inverse() * Vector3.new(0,0,-1))

--prints :  8.9407244274753e-08, 0, 1
``````

As the CFrames orientation is inversed, how come the Z value in the second code sample doesn’t print out -1?

Better to visualize what CFrame inversing does:

Here is what you expected the angles are reversed, the 90 degree y rotation becomes -90 degree y rotation:

``````local cf = CFrame.Angles(0,math.rad(90),0)
local part = Instance.new("WedgePart")
part.Anchored = true
part.BrickColor = BrickColor.Red()
part.CFrame = cf
part.Parent = workspace

local part = Instance.new("WedgePart")
part.Anchored = true
part.BrickColor = BrickColor.Green()
part.CFrame = cf:Inverse()
part.Parent = workspace
``````

The wedges are facing each other: