How do I weld a model to a single part and tween it in a script?

Help and Feedback Scripting Support
1

Hi, I have a model which I want to tween. I want the model to be welded a single part where I can easily move that part and the whole model moves with it? I tried making some code for it but only the single part moves and not the whole model!

local function Weld(part, base)
	if part == base then return end
	if part:IsA("BasePart") then
		local Weld = Instance.new("Weld")
		Weld.Part0 = part
		Weld.Part1 = base
		Weld.C0 = part.CFrame:toObjectSpace(base.CFrame)
		Weld.Parent = part
	end
end

local function weldCoin(coin)
	local base = coin.PrimaryPart
	local root = Instance.new("Part")

	root.Size = Vector3.new(2, 2, 2)
	root.Position = base.Position
	root.Name = "RootForWelds"
	root.Transparency = 0
	root.Anchored = true
	root.CanCollide = false
	
	root.Parent = coin

	for _, part in ipairs(coin:GetDescendants()) do
		if part:IsA("BasePart") then
			part.CanCollide = false
			part.Anchored = false
			Weld(part, root)
		end
	end
	
	coin.PrimaryPart = root
end
2

Use WeldConstraints, you can undon the C0 stuff

You also have to weld all parts inside the model with the part being moved and welded with the other part.

3

Set the part you want to move as the PrimaryPart of your model, then use TweenService to tween the PrimaryPart CFrame.

4

Can you give me an example please? Like some demonstration code

5 
local function Weld(targetPart, basePart)
    local newWeld = Instance.new("WeldConstraint")
    newWeld.Part0 = basePart
    newWeld.Part1 = targetPart
    newWeld.Name = targetPart.Name
    newWeld.Parent = basePart
end