Why do we use :Inverse() when Applying CFrames to Welds

[DasKairo (Cairo)]

So I have a small Question about how Welds work when trying to Script stuff, while I was playing around with some Welds, I tried applying a CFrame Value to it to apply its position somewhere else relative to a Part, but doing this causes issues where the Part does not go where where it needs to, and for some reason :Inverse() fixed the issue, What does :Inverse() do to welds? Why do we use it for this purpose?

[nicemike40]

Here, I have answered a similar question before. It may be useful to you:

Why do we inverse cframes after welding?

Inverse() is like the negative version of a CFrame. So you can use it to compute offsets: local a = PartA.CFrame local b = PartB.CFrame local aToB = b:Inverse() * a -- b:ToObjectSpace(a) does this same thing So in this example, a * aToB == b This is useful for welds because welds only know about offsets. So if you were welding PartA to PartB you would just need to set the C0 of the weld to aToB, because C0 literally means “the offset from Part0 to Part1” (if C1 is CFrame.new()). local w …

Also see this post for more details about what C0/C1 actually mean:

Can someone tell me what C0 and C1 properties are?

A Weld is really a point in space. C0 is the position of that point, relative to Part0. C1 is the position of that point, relative to Part1. So if C0 = CFrame.new(1, 0, 0), and C1 = CFrame.new(-2, 0, 0), the weld’s position is 1 stud to the right of Part0, and 2 studs to the left of Part1. Meaning that Part1 is 3 studs to the right of Part0.

[DasKairo (Cairo)]

I mean, It kind of makes sense, but playing around with the Weld does not give me the Results that was being said, and just ended up not working.

Edit: Fixed it by adding another Weld.