Getting Rotation Between Two Orientations WITHOUT World Influence

Help and Feedback Scripting Support
1

Pretty much, I’m making a drifting game, and I’ve been trying to make a script to detect the angle between the camera and the player’s rotation.

It’s supposed to work like this:

Which it does
Until I rotate the player in the opposite direction:

I mean obviously, if the world angle changes to a negative, everything else will too.

But is there a way to get the angle between JUST the camera and player WITHOUT world influence?

This is my code:

local char = player.Character
local hrp = char:FindFirstChild("HumanoidRootPart")
local cam = game.Workspace.CurrentCamera

game:GetService("RunService").RenderStepped:connect(function()
	local swingformula = (cam.CFrame.LookVector.X-hrp.CFrame.LookVector.X)*100
	script.Parent.Frame.Backing.Needle.Rotation = swingformula
	print(swingformula)
end)

Thank you, and I’m sorry if this is an awful post. (It’s my first)

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2

Hmm are you looking for CFrame:VectorToObjectSpace()?

With that function you can calculate a direction relative to a CFrame.

You can then get the Characters LookVector relative to the Camera’s CFrame or Vice versa depending on how you want it to look.

Refer to Object and World Space | Roblox Creator Documentation

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3

Thanks! I’ll give that a shot and let you know what happens!

4

Kind of irrelevant but this is related to CFrames

hmm = math.acos(u:Dot(v))
axis = u:Cross(v).Unit
qw = math.cos(hmm / 2)
qx = math.sin(hmm / 2) * axis.x
qy = math.sin(hmm / 2) * axis.y
qz = math.sin(hmm / 2) * axis.z

Just wanted to point it out!

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5

This worked PERFECTLY
Thank you!!!

This is the new code:

local swingformula = ((hrp.CFrame:ToObjectSpace(cam.CFrame)).X)
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