How can I rotate an accessory with a script without moving the accessory?

[Soulsplosion]

I’m trying to allow the client to rotate their accessories. AFAIK, this has to be done by rotating a CFrame of the weld because if you rotate the Handle it rotates the whole character. The problem I am having is that if you change the orientation of the weld’s CFrames, this creates an orbital movement around the Attachment. This isn’t an issue for some accessories based on the positioning of their attachment.

I’ve been scouring around in resources to try to figure it out but nothing has helped.

• Basics of CFrame multiplication and Welds/Motor6Ds/Joint Instances: The solution here rotates the part itself instead of the weld’s CFrame. I cannot do this because rotating an accessory attached to the character rotates the character.
• How to rotate an accessory that the user has equipped by script?: This solution just does not work for me. The orbiting problem is unchanged

Simple example code:

local ContextActionService = game:GetService("ContextActionService")

local rotation = 0

ContextActionService:BindAction("t", function(n, inputState)
	rotation += 5
	
	local Accessory = game.Players.LocalPlayer.Character:FindFirstChild("Woman Face")
	local Weld = Accessory.Handle.AccessoryWeld
	
	local C0 = Weld.C0
	Weld.C0 = CFrame.new(C0.Position.X, C0.Position.Y, C0.Position.Z) * CFrame.Angles(0, 0, math.rad(rotation))
	
end, false, Enum.KeyCode.T)

Thank you very much for any help!

[dthecoolest]

Try doing this

local function worldCFrameRotationToC0ObjectSpace(motor6DJoint,worldCFrame)
	local part0 = motor6DJoint.Part0
	local c1Store = motor6DJoint.C1
	local c0Store = motor6DJoint.C0
	local relativeToPart0 = part0.CFrame:inverse() * worldCFrame * c1Store
	
	local goalC0CFrame = relativeToPart0
		
	return goalC0CFrame
end

local ContextActionService = game:GetService("ContextActionService")

local rotation = 0

ContextActionService:BindAction("t", function(n, inputState)
	rotation += 5
	
	local Accessory = game.Players.LocalPlayer.Character:FindFirstChild("Woman Face")
	local Weld = Accessory.Handle.AccessoryWeld
	
	local C0 = Weld.C0
local part1 = Weld.Part1

local goalWorldSpaceCFrame = CFrame.Angles(0, 0, math.rad(rotation)*part1.CFrame
	Weld.C0 = worldCFrameRotationToC0ObjectSpace(Weld, goalWorldSpaceCFrame)
	
end, false, Enum.KeyCode.T)

[Soulsplosion]

oh my gosh its dthecoolest

that does this

but thank you!

[dthecoolest]

Thanks for making the effort to try it out. It was just an idea I had in my head.

Turns out it’s weirder since for accessories since the part0 and part1 is swapped.

Normally the part0 is the one closer to the root part.

So I used the formula for C1 instead and it worked…seems like swapping the part0 and part1 reverses the formulas for C0 and C1.

@dthecoolest

As a bonus thanks to some advice is the derivation for C1 which is more interesting as the goal CFrame is the one being inversed instead of the Part0 for the C0 solution:

Part0.CFrame * C0 = part1.CFrame * C1
weld.Part1.CFrame:inverse() * weld.Part0.CFrame * weld.C0 = weld.C1
--Subsitute part1 with some goalCFrame, to make part1 go to goal target
goalCFrame:Inverse() * motor6DJoint.Part0.CFrame * motor6DJoint.C0

local function worldCFrameRotationToC1(motor6DJoint, worldCFrame)
	local part0 = motor6DJoint.Part0
	local c0Store = motor6DJoint.C0
			
	return worldCFrame:Inverse() * part0.CFrame * c0Store 
end

local accessoryWeld = script.Parent.AccessoryWeld

local Weld = accessoryWeld

local function worldCFrameRotationToC1(motor6DJoint, worldCFrame)
	local part0 = motor6DJoint.Part0
	local c0Store = motor6DJoint.C0

	return worldCFrame:Inverse() * part0.CFrame * c0Store 
end

while true do
	local dt = task.wait()
	

	local C0 = Weld.C0
	local part0 = Weld.Part0
	local rotation = 100*dt
	local goalWorldSpaceCFrame = (CFrame.Angles(0, 0, math.rad(rotation))*part0.CFrame).Rotation + part0.Position
	Weld.C0 = worldCFrameRotationToC1(Weld, goalWorldSpaceCFrame)
end

[Soulsplosion]

WHOAAAAAAAAAAAAAAAAAAAA

thanks so much!!