Keeping world position of object the same while welded to an object that can move independently

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#1

I’m stumped.
I have two accessories, accessory A and accessory B. Accessory B is welded to accessory A. Accessory A is welded to the head of the player’s character. Both of them have a blank c0, and a c1 which acts as the offset.

Now, say I wanted to change only accessory A’s C1, and keep accessory B’s world position the same while doing so. How would I go about doing this? There doesn’t seem like an easy way to do so. The method that I have devised involves getting the magnitude and direction between the two accessories world CFrame positions, and setting the C1 to that.

There are some issues. Rotating accessory A will cause accessory B to rotate with it as if they were grouped together. This behavior is unintended, as I only want accessory A to be rotating. Accessory B’s world position should stay the same. This issue has been slowly chipping away at my sanity for the past few days and I can’t figure out a way to fix it. Any help?

#2

You can use this formula to work with c1 in world space. You will have to change the C1 in the appropriate order with accessory A first then B.

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

A section from my messily made tutorial.

#3

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