How do I weld two parts while keeping their relative position and orientation?

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1

I have a handgun holster and it has its own CFrame which is relative to the dummy’s HumanoidRootPart, and I want to weld it to a player’s HumanoidRootPart while keeping the same relative position and orientation. How do I do that? I tried the following but I got odd results.

function module:Weld(part0: BasePart, part1: BasePart, inverse0: CFrame, inverse1: CFrame): Weld
	local weld = Instance.new("Weld")
	weld.Part0 = part0
	weld.Part1 = part1
	if inverse0 and inverse1 then
		weld.C0 = inverse0:Inverse()
		weld.C1 = inverse1:Inverse()
	else
		weld.C0 = part0.CFrame:Inverse()
		weld.C1 = part1.CFrame:Inverse()
	end
	weld.Parent = part1
	return weld
end

local weld = Util:Weld(character:FindFirstChild("Torso"), root,
	character.PrimaryPart.CFrame,
	gear:FindFirstChild("CFrameInfo").Value:ToObjectSpace(character.PrimaryPart.CFrame)
)
2

Use a WeldConstraint | Roblox Creator Documentation and don’t bother with C0 and C1 at all.

2 Likes
3

It will center the handgun holster to the humanoidrootpart instead of keeping its relative cframe resulting in the handgun holster being placed inside of the player’s torso which is not what I want to achieve.

4

Really the position thing is doubtful for me, but if you weld it with something, use weld.C0 = CFrame (10, 0, 0)

The orientation is put after putting the weld, for example:

local part = Instance.new("Part")
part.Parent = Workspace

local Weld = Instance.new("Weld")
Weld.Part0 = (NameTheObject)
Weld.Part1 = part
Weld.Parent = part
Weld.C0 = CFrame(19, 0, 0)

part.Orientation = Vector3.new(10, 20, 30)
5

I have no idea what you mean but if you insist on using a Weld instead of a WeldConstraint you can do

weld.C0 = part0.CFrame:Inverse() * part1.CFrame
6

I want to place the taser holster in this spot but on the player’s character programmatically.

image
image630×715 59.2 KB

7

Okay so, what’s your question exactly?

Set the C0 of the weld to whatever you want it to be.

8

Yeah but how? I need to know the right CFrame value so I can use it.

9

You can get the transform from the root to the holster like

local offset = root.CFrame:Inverse() * holster.CFrame

Then you can use that as the C0 of the weld later.

10 
local offset = character:FindFirstChild("Torso").CFrame:Inverse() * holster.CFrame
local weld = Instance.new("Weld")
weld.Part0 = character:FindFirstChild("Torso")
weld.Part1 = holster
weld.C0 = offset

So what now? I don’t know what to do with the offset now
image

11

I mean that’s it. Does that not work?

I’m assuming the holster is already placed in the right position before you start welding?

12

Yes it doesn’t work, its completely off.

1 Like