Need help with Lerp jitter

Help and Feedback Scripting Support
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#1

I have a local script where I update the viewmodel cframe to the player’s camera cframe and it’s been working great, however I’ve tried to add inertia using Lerp but it jitters way too much.

WITHOUT LERP:

LOCAL SCRIPT:

local targetCFrame	= camera.CFrame
local currentCFrame	= inventoryData.viewmodel.PrimaryPart.CFrame
local newCFrame		= inertia.ApplyInertia(currentCFrame, targetCFrame, deltaTime)
inventoryData.viewmodel:SetPrimaryPartCFrame(newCFrame)

INERTIA MODULE:

local module = {}

module.inertiaSpeed	= 30

function module.ApplyInertia(currentCFrame : CFrame, targetCFrame : CFrame, deltaTime : number)
	
	local alpha = module.inertiaSpeed * deltaTime
	alpha = math.clamp(alpha, 0, 1)
	
	
	local lerpedPosition = currentCFrame.Position:Lerp(targetCFrame.Position, alpha)
	local finalCF = CFrame.new(lerpedPosition) * targetCFrame.Rotation
	
	return finalCF
end

return module

I’ve tried to fix it using AI and searching the forums, thanks in advance.

#2

When do you call ApplyInertia? It seems like you’ve got it delayed until after the render completes, so it ends up applying to the next frame. This looks very much like a 1-frame-late jitter.