How to only tween in one direction?

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#1

Hey! I’m making a Gomu-Gomu no mi Script (One Piece)
→ If you don’t know what that means, it’s an ability that makes your body elastic so you can stretch your arms and punch your enemies

The only problem is, that the tween goes into two directions. Front and back. How to I make it so it only tweens to the front? Here is a video about the behaviour:

Here is a snippet of the script (which is the most important part I guess)

tweenService:Create(fakeRightArm, TweenInfo.new(0.3, Enum.EasingStyle.Quad), {Size = fakeRightArm.Size + Vector3.new(0, 50, 0)}):Play()

I tried doing

tweenService:Create(fakeRightArm, TweenInfo.new(0.3, Enum.EasingStyle.Quad), {Size = fakeRightArm.Size + Vector3.new(0, 50, 0), Position = fakeRightArm.Position + Vector3.new(0, 0, 50)}):Play()

but that makes it literally fly out of my arm.

Thank you!

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#2

If I’m correct, try and use lookVector/upVector/rightVector, which is a property of CFrame. This ensures to resize the part in a specific direction.

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#3 
Size = fakeRightArm.CFrame.LookVector + Vector3.new(0,50,0)

Or what do you mean?

#4

Hey yeah, you can probably do this when tweening your Fake arm, here:

fakeRightArm.CFrame = fakeRightArm.CFrame * CFrame.new(0, 0, 50/2) -- Divide the axis by two you are resizing the part from
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#5 
tweenService:Create(fakeRightArm, TweenInfo.new(0.3, Enum.EasingStyle.Quad), {Size = fakeRightArm.Size + Vector3.new(0, 50, 0), CFrame = fakeRightArm.CFrame * CFrame.new(0, 0, 50/2)}):Play()

Still doesn’t work. Same issue as in the video.

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#6

You can do this.

game.Workspace.Part.CFrame = game.Workspace.Part.CFrame + (game.Workspace.Part.CFrame.lookVector * 5)
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#7

You need to use a Vector3 value if your multiplying it. And also, this still doesn’t work.

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#8

No, when using CFrames, multiplying is like adding.

#9

Oh okay. Try and use lookVector to see if it works or not.

Disclaimer: lookVector only works on front surfaces of the part.

#10

Like this?

tweenService:Create(fakeRightArm, TweenInfo.new(0.3, Enum.EasingStyle.Quad), {Size = fakeRightArm.Size + Vector3.new(0, 50, 0), Position = RightArm.CFrame.LookVector * 20}):Play()

That doesn’t work, for some reason it tweens it up in the air.

RightArm is the RightLowerArm of the character btw.

#11

Sorry, but I forgot to mention that Size can also use CFrames, so it would be like:

part.Size = (part.CFrame + part.CFrame.lookVector*5)

EDIT: I’ve made a small mistake here, it’s a + not *.
#12

Motor6D’s have a property named C0, that is basically the CFrame offset position of the joint, tween it aswell, and tween it in the direction of the size addition and split it by half the size addition

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#13

But it’s a FakeArm, it’s not the real RightLowerArm.

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#14

But that doesn’t change the size…

#15

In the video, it changes the size of the fake arm.

#16

Now tell me, what do you use to connect the fake arm to the real arm?

#17

That’s a type mismatch. " TweenService:Create property named ‘Size’ cannot be tweened due to type mismatch (property is a ‘Vector3’, but given type is ‘CoordinateFrame’)"

You are adding a CFrame with a Vector3.

#18 
	local fakeRightArm = Instance.new("Part")
	fakeRightArm.BottomSurface = Enum.SurfaceType.Smooth
	fakeRightArm.CanCollide = false
	fakeRightArm.Massless = true
	fakeRightArm.Material = Enum.Material.Plastic
	fakeRightArm.BrickColor = RightArm.BrickColor
	fakeRightArm.Size = RightArm.Size
	fakeRightArm.CFrame = RightArm.CFrame
	fakeRightArm.Parent = character 
	fakeRightArm.Name = "fakeRightArm"
	local weld = Instance.new("WeldConstraint")
	weld.Part0 = RightArm
	weld.Part1 = fakeRightArm
	weld.Parent = character
	weld.Name = "FakeArmWeld"

A weld.

#19

Weld.C0 is what you are looking for, it is a CFrame, when you modify it, it changes the offset of the connected part.

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#20

But this is a WeldConstraint, not a normal weld :confused: It only has Part0 and Part1.

Should I replace it with a normal weld?