Tweening CFrame values. Need some help

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1

Hello guys,

I’m trying to tween CFrame values, I’m going to be use it to make the wings of a butterfly flap.

Here’s my the script:

local tweenService = game:GetService("TweenService")
local runService = game:GetService("RunService")

local butterfly = script.Parent.Parent

local leftWing = butterfly.LeftWing
local rightWing = butterfly.RightWing
local wingHinge = butterfly.WingHinge
local hingePos = wingHinge.Position

local angleUp = 55
local angleDown = 0
local flapDuration = 30

local lWingPos = Instance.new("CFrameValue")
lWingPos = leftWing.CFrame

local lWingUp = Instance.new("CFrameValue")
lWingUp  = CFrame.new(wingHinge.Position) * CFrame.Angles(0, 0, math.rad(angleUp)) * CFrame.new((leftWing.Size.X / 2) + (wingHinge.Size.Y /2), (leftWing.Size.Y / 2) + (wingHinge.Size.Y /2), 0)

local tweenTime = TweenInfo.new(flapDuration)

local leftWingTweenUp = tweenService:Create(lWingPos, tweenTime, lWingUp)
leftWingTweenUp:Play()

local conn = runService.Heartbeat:Connect(function()
  leftWing.CFrame = lWingPos.Value
end)

When I run it, I’m getting the following error:
Unable to cast value to Object

Which is point to:
local leftWingTweenUp = tweenService:Create(lWingPos, tweenTime, lWingUp)

Would appreciate some here, I thought both lWingPos and lWingUp would be same type.

I’m a little bit lost here.

Thanks in advance.

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2

The 1st argument to TS:Create is the part, not position.

1 Like
3

Hi @infiniteRaymond, thanks for your reply.

Accordingly to the documentation the very first argument is an instance, in which case I’m compliant.

In fact, if I remove the line:
lWingPos = leftWing.CFrame

I get no errors, although the animation doesn’t work really well, because I would be creating a CFrameValue instance with zeroed values.

1 Like
4

Ohh, alright.

Try this then:

local leftWingTweenUp = tweenService:Create(lWingPos, tweenTime, {Value = lWingUp.Value})
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5

Why not just rig the Butterfly and animate it?

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6

Because he wants to do tweening. Besides, not everybody is a great animator :v

1 Like
7

No, I totally understand. Just didn’t know if he was able to animate better and requires less code. Was just giving my opinion. Sorry.

2 Likes
8

Thanks everybody for trying to help.

I just cracked it…

It’s simpler and more efficient, here’s the code in case somebody may need in the future:

local tweenService = game:GetService("TweenService")
local runService = game:GetService("RunService")

local butterfly = script.Parent.Parent
local leftWing = butterfly.LeftWing
local rightWing = butterfly.RightWing
local wingHinge = butterfly.WingHinge

local hingePos = wingHinge.Position

local angleUp = 55
local angleDown = 0
local flapDuration = .2

local XOffset = (leftWing.Size.X / 2) - (wingHinge.Size.X / 2)
local YOffset = (leftWing.Size.Y / 2)
local ZOffset = (wingHinge.Size.Z / 2)- (wingHinge.Size.Z / 2)

local wingAngle = Instance.new('NumberValue')
wingAngle.Value = 0

local tweenTime = TweenInfo.new(flapDuration, Enum.EasingStyle.Linear, Enum.EasingDirection.InOut,0,false,0)

local flapUpTween = tweenService:Create(wingAngle, tweenTime, { Value = angleUp })
local flapDownTween = tweenService:Create(wingAngle, tweenTime, { Value = angleDown })

flapUpTween.Completed:Connect(function(playbackState)
  flapDownTween:Play()
end)

flapDownTween.Completed:Connect(function(playbackState)
  flapUpTween:Play()
end)

flapUpTween:Play()

local conn = runService.Heartbeat:Connect(function()
  leftWing.CFrame = CFrame.new(wingHinge.Position) * CFrame.Angles(0, 0, math.rad(wingAngle.Value)) * CFrame.new(XOffset, YOffset,ZOffset)
  rightWing.CFrame = CFrame.new(wingHinge.Position) * CFrame.Angles(0, 0, math.rad(180 - wingAngle.Value)) * CFrame.new(XOffset, -YOffset,ZOffset)
end)
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