What is Lerp, and is it just a worse version of TweenService? Is it deprecated?

[Bonusizawesome (Olive)]

I’ve heard that Lerp should not be used and that I should use TweenService instead. Is this correct?

[Downrest (Down)]

Lerp() just means linear interpolation. It isn’t deprecated, it’s a raw math function that uses a linear function to interpolate between two values. With that said, you should probably just use TweenService.

[Bonusizawesome (Olive)]

Is there some niche use case for Lerp() where it is better to use than TweenService?

[aliaun125 (David)]

I think that lerp causes more lag comparing to tween. (however they are pretty different)

[Downrest (Down)]

You can use :Lerp() to position a part between two other points with a specified alpha.

@XdJackyboiiXd21

Here is another example of using Lerp. We loop through, starting at 0.1, and ending at 0.9, increasing by 0.1 each time. Then I create a new part each loop and position it that much between the two parts.

local Part1 = game.Workspace:WaitForChild("Part1")
local Part2 = game.Workspace:WaitForChild("Part2")

for i = 0.1, 0.9, 0.1 do
	local Part = Instance.new("Part", workspace)
	Part.Anchored=  true
	Part.CFrame = Part1.CFrame:Lerp(Part2.CFrame, i)
	local Suface = script.SurfaceGui:Clone()
	Suface.TextLabel.Text = i
	Suface.Parent = Part
end

Result:

As you can see, lerping by 0.1 creates a part very close to “Part1”, lerping by 0.5 creates a part in between, and lerping 0.9 creates a part very close to Part2

[Bonusizawesome (Olive)]

oh, I see. Thanks for the explanation everyone!

[Bonusizawesome (Olive)]

oh that seems like it could be useful in some cases. thanks!

[Downrest (Down)]

I don’t think there is practically any (negligible) difference. Tweens actually use linear interpolation.

[Craxypt (Crax)]

Yes, let’s say you want to do math to create a more complicated animation, such as a curved path. You’d use lerp rather than tween.