Can't get angle of Right Vector and lookvector

[TF_Killer (Nezui)]

Hi, I’m trying to get a angle of my part’s lookvector and right vector but it doesn’t seem to be right

local gizmo = require(script:WaitForChild('gizmo'))

local test = workspace.test

spawn(function()
	game["Run Service"].Heartbeat:Connect(function()
		gizmo.drawRay(test.Position,test.CFrame.LookVector)
		gizmo.drawRay(test.Position,test.CFrame.RightVector)
		
		local a = test.CFrame.LookVector
		local b = test.CFrame.RightVector
		local cos = (a.X*b.X+a.Y*b.Y+a.Z*b.Z) /((math.sqrt(a.X*a.X+a.Y*a.Y+a.Z*a.Z)) * math.sqrt(b.X*b.X+b.Y*b.Y+b.Z*b.Z))
		local deg = math.acos(cos)
		print(deg)
		
	end)
end)

what it prints :

the formula:

[Kaid3n22 (Kaiden)]

This is the correct answer; the max an angle of two points can ever be is pi because they are in a circle. If you divide that answer by pi and multiply it by 180, you should get the correct answer.

local part = workspace.Part
local a = part.CFrame.LookVector
local b = part.CFrame.RightVector
print(math.acos(a:Dot(b))/math.pi*180)

Using math.acos and dot is the faster way of doing your equation (I’m not too good at explaining this type of stuff, so sorry).

[TF_Killer (Nezui)]

why we have to divide pi? Uhh, I think it convert rad to deg

[Kaid3n22 (Kaiden)]

The vectors form a circle, try looking with the rotation tool, those are directly 1 stud in each direction.

[TF_Killer (Nezui)]

so that’s called unit circle right?

[Kaid3n22 (Kaiden)]

Yes, that would be considered a unit circle.

[TF_Killer (Nezui)]

thanks man after doin some research I got it

[JarodOfOrbiter]

I commend you if you’re trying to learn to do this yourself, but if you weren’t aware Roblox does have functions to take care of this math already via LookVector:Dot(RightVector)

Also, you don’t need to use spawn here. Events run asynchronously to the rest of your code.