Need help with C0 rotation

[stark pier]

This is my first time touching roblox scripting and ive been trying to make the Neck's C0's orientation follow the player camera's orientation but I just cant seem to make it follow the orientation without the neck moving... I hope someone can help me.

local Workspace = game:GetService("Workspace")
local RunService = game:GetService("RunService")

local player = game.Players.LocalPlayer
local character = player.Character

local neck = character:WaitForChild("Head"):WaitForChild("Neck")
local camera = Workspace.CurrentCamera

local function updateNeckC0()
local cameraCFrame = camera.CFrame
local rotation = cameraCFrame
neck.C0 = rotation
end

RunService:BindToRenderStep("UpdateNeckC0", Enum.RenderPriority.Camera.Value + 1, updateNeckC0)

[gleaming cobalt]

Nice formatting

[eager ginkgo]

do local rotation = cameraCFrame.Rotation

the camera cframe has a translation in it

and your never removing it

also there is a workspace constant, no need to :GetService() it 😭

You should game:GetService("Players") though

[stark pier]

what is that

[stark pier]

okay

[eager ginkgo]

A global constant, workspace is a varaible that already exists and is preset to the game's workspace

[stark pier]

so I dont need to get service for workspace?

[eager ginkgo]

correct

[stark pier]

it's working but now the neck is inside the body, is it because the body is the center? do I need to offset it?

[eager ginkgo]

Is the head upsidown by any chance?

or just offset

[stark pier]

idk... its hard to see when I cannot see its face T-T

[blissful mulch]

The Neck had translation that was overwritten

[eager ginkgo]

fair

In studio check what the C0 property is set to

for a character

by default

Whatever's there is the offset/rotation you'll have to add in

[stark pier]

umm wait a sec

[solar belfry]

** You are now Level 1! **

[stark pier]

ive offset it but now it's weird

[eager ginkgo]

Try changing C1 instead of offseting it

[stark pier]

whats the diff between C0 and C1?

[blissful mulch]

You can multiply the final neck CFrame by CFrame.Angles(0, math.rad(180), 0)

Basically flipping it around

[stark pier]

still the same problem, when the player spins, the neck still spins but the spin orientation now adds with the camera movement... idk if im explaining correctly

[eager ginkgo]

One applies at Part0 and the other applies at Part1

[blissful mulch]

Can I see what you're doing now?

[stark pier]

Unable to assign property C1. CoordinateFrame expected, got Vector3

[stark pier]

how?

[blissful mulch]

Like show the code but with your changes

[stark pier]

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local player = game.Players.LocalPlayer
local character = player.Character

local neck = character:WaitForChild("Head"):WaitForChild("Neck")
local camera = workspace.CurrentCamera

local function updateNeckC0()
local cameraCFrame = camera.CFrame
local rotation = cameraCFrame.Rotation * CFrame.Angles(0, math.rad(180), 0)
local offset = Vector3.new(0, 0.75, 0)
neck.C0 = rotation
neck.C1 = offset
end

RunService:BindToRenderStep("UpdateNeckC0", Enum.RenderPriority.Camera.Value + 1, updateNeckC0)

[blissful mulch]

Can you format that like this in your Discord message:

[stark pier]

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local player = game.Players.LocalPlayer
local character = player.Character

local neck = character:WaitForChild("Head"):WaitForChild("Neck")
local camera = workspace.CurrentCamera

local function updateNeckC0()
    local cameraCFrame = camera.CFrame
    local rotation = cameraCFrame.Rotation * CFrame.Angles(0, math.rad(180), 0)
    local offset = Vector3.new(0, 0.75, 0)
    neck.C0 = rotation
    neck.C1 = offset
end

RunService:BindToRenderStep("UpdateNeckC0", Enum.RenderPriority.Camera.Value + 1, updateNeckC0)

[stark pier]

do you what im tryna say? 😓

[blissful mulch]

C1 needs a CFrame, so you need to wrap that Vector3 in CFrame.new

[stark pier]

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local player = game.Players.LocalPlayer
local character = player.Character

local neck = character:WaitForChild("Head"):WaitForChild("Neck")
local camera = workspace.CurrentCamera

local function updateNeckC0()
    local cameraCFrame = camera.CFrame
    local rotation = cameraCFrame.Rotation
    local offset = CFrame.new(Vector3.new(0, -1.25, 0))
    neck.C0 = rotation
    neck.C1 = offset
end

RunService:BindToRenderStep("UpdateNeckC0", Enum.RenderPriority.Camera.Value + 1, updateNeckC0)

[stark pier]

now there is a new problem, since the original location of the neck is in the middle of the torso, the neck now rotate with the torso as the main point

[solar belfry]

** You are now Level 2! **

[stark pier]

oh but if I add the offset into C0 thats not a problem anymore

so now its back to the weird rotate part

the neck orientation is fine if i dont move but if my character spins or starts moving, the neck orintation starts getting weird

[blissful mulch]

Here's what I'd do:

1. Take the Necks C0 position, turn that into a new CFrame.
2. Multiply that new CFrame with the camera's rotation (.Rotation to get a CFrame's rotation without translation)
3. Multiply that by the 180° offset
4. Set neck C0 to that

[stark pier]

my brain not braining

wait a sec

I dont understand... isnt there a way to make it so that the neck does not rotate even when the character spins or moves? the only changes to its orientetion can happen only whith the camera

[blissful mulch]

If you update the neck repeatedly it shouldn't be able to be anything other than this.

We can take it one step at a time. First, take the Neck's position from its C0 and put that into a variable

[stark pier]

local NeckOriginalC0 = neck.C0

and then?

[blissful mulch]

No, the position of the C0. We want a new CFrame that only has the position

[stark pier]

how do I take only the position

.Position?

[blissful mulch]

yes, but use that Position to make an entirely new CFrame via CFrame.new

[stark pier]

this?

local NeckOriginalC0 = CFrame.new(neck.C0.Position)

[blissful mulch]

Yeah, that works.

So now we need to multiply that by the camera's rotation, which we can get from the camera's CFrame .Rotation

[stark pier]

local function updateNeckC0()
    local cameraCFrame = camera.CFrame
    local rotation = cameraCFrame.Rotation
    --local offset = Vector3.new(0, 0.75, 0)
    --neck.C0 = rotation + offset
    local NeckOriginalC0 = CFrame.new(neck.C0.Position)
    local NewRotation = NeckOriginalC0 * rotation
    neck.C0 = NewRotation * CFrame.Angles(0, math.rad(180), 0)
end

you there? 😭

[blissful mulch]

Did that do anything?

[stark pier]

nope

[blissful mulch]

So what issue are we at right now?

[stark pier]

the same as before

[solar belfry]

** You are now Level 3! **

[blissful mulch]

Can you record it so I can visualize the issue better

[stark pier]

wait

[blissful mulch]

Try 90 instead of 180 for the final offset

[stark pier]

still has the same problem

I appreciate your help bro but I think Imma sleep now... it is 4 in the morning here. I hope we can continue later

[blissful mulch]

I'll think about it for a bit. We may be able to use the CFrame.lookAt to achieve what we're after. Feel free to ping me later on.

[stark pier]

okay 😊

[stark pier]

Hi @blissful mulch , Ive seen .LookAt in documentations but I still dont really know how it works

ill look into it first

[stark pier]

hmm

how do I make it so that lua local NeckOriginalC0 = neck.C0.Position only save the position of the neck on startup and does not reupdate the variable to the latest position, just the intial position

im not getting anywhere

ill do something else first

I wanted to use https://create.roblox.com/docs/en-us/workspace/cframes#face-a-specific-surface-toward-a-point
but it still doesnt work

I guess ill need to wait for you @blissful mulch

[stark pier]

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local player = game.Players.LocalPlayer
local character = player.Character

local neck = character:WaitForChild("Head"):WaitForChild("Neck")
local camera = workspace.CurrentCamera

local function updateNeckC0()
    local NeckOriginalC0 = neck.C0.Position
    local targetPosition = camera.CFrame.Position
    neck.C0 = CFrame.new(NeckOriginalC0, targetPosition) * CFrame.Angles(0, math.rad(180), 0)
    
    --local NeckOriginalC0 = CFrame.new(neck.C0.Position)
    --local cameraCFrame = camera.CFrame
    --local rotation = cameraCFrame.Rotation
    --local NewRotation = NeckOriginalC0 * rotation
    --neck.C0 = NewRotation
end

RunService:BindToRenderStep("UpdateNeckC0", Enum.RenderPriority.Camera.Value + 1, updateNeckC0)

This is my latest test, doesnt work so I think imma do smin else first and come back when I know more abt roblox scripting

[stark pier]

And if I use this, after while of playing, like the character moves around and stuff, the neck stops rotating with the camera at some point

[blissful mulch]

Different timezones, I was asleep

So for .lookAt, I was imagining using it to look at where the camera is looking at.

Now the issue is that this may make the head point in unnatural angles.

Maybe start here instead:
https://youtu.be/mdXRnNb0S6o

[stark pier]

oh, okay

[stark pier]

It's working now

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local player = game.Players.LocalPlayer
local character = player.Character

local root = character:WaitForChild("HumanoidRootPart")
local neck = character:WaitForChild("Head"):WaitForChild("Neck")
local camera = workspace.CurrentCamera

local CFNew, CFAng, asin = CFrame.new, CFrame.Angles, math.asin

local function updateNeckC0()
    local cameraDirection = root.CFrame:toObjectSpace(camera.CFrame).lookVector
    
    if neck then
        neck.C0 = CFNew(neck.C0.p) * CFAng(asin(cameraDirection.y), -asin(cameraDirection.x), 0)
    end
end

RunService:BindToRenderStep("UpdateNeckC0", Enum.RenderPriority.Camera.Value + 1, updateNeckC0)

[solar belfry]

** You are now Level 4! **