Cloning Character in Viewport Looks Choppy

Help and Feedback Scripting Support
#1

Hey everyone, I’m having some issues with rendering my character in a viewport frame. I’d like it to look smooth, although for some reason it looks extremely choppy. I followed a tutorial on youtube to get it in the current state.

robloxapp-20220403-1457112.wmv (1.6 MB)
This is what it looks like.

SH1
Here is what it looks like in the explorer.

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RemoteEvents = ReplicatedStorage:WaitForChild("RemoteEvents")

local RunService = game:GetService("RunService")
local TimeFunction = RunService:IsRunning() and time or os.clock
local viewportFrame = script.Parent:WaitForChild("ViewportFrame")

local running = script.Parent:WaitForChild("Running")
local modelName = script.Parent:WaitForChild("ModelName")
local gameWorkspace = game:GetService("Workspace")
local currentModel = nil
local cam = Instance.new("Camera", script.Parent)
local elapsedTime = 0
local rate = 1 / 60 -- 30 times a second

local function modifyViewport(currentModel, deltaTime)
	local model = viewportFrame:FindFirstChild("Model")
	if(model) then
		model:Destroy()
	end
	
	local newModel = Instance.new("Model")
	newModel.Name = "Model"
	newModel.Parent = viewportFrame
	-- Replaces with current model
	for i,v in pairs(currentModel:GetChildren()) do
		local v2 = v:Clone()
		if(v2:IsA("Script") or v2:IsA("LocalScript") or v2:IsA("ModuleScript")) then
			v2:Destroy()
		else
			v2.Parent = newModel
			if(v2:IsA("Humanoid")) then
				v2.DisplayDistanceType = Enum.HumanoidDisplayDistanceType.None
			end
		end


	end
	viewportFrame.CurrentCamera = cam
	cam.CFrame = ((currentModel.PrimaryPart.CFrame * CFrame.Angles(math.rad(15),math.rad(180),0)) * CFrame.new(0,1,4)) + cam.CFrame.LookVector * deltaTime	
end

game:GetService("RunService").RenderStepped:Connect(function(deltaTime)
	
	elapsedTime += deltaTime

	rate = 60 / (1/deltaTime) * 0.01
	
	if(running.Value) then
		local currentModel = gameWorkspace:FindFirstChild(modelName.Value) or gameWorkspace.NPCs:FindFirstChild(modelName.Value)
		if(currentModel) then
			local success, errorMessage = pcall(function()
				if elapsedTime >= rate then
					modifyViewport(currentModel, deltaTime)
					elapsedTime -= rate
				end
			end)
			if not success then
				warn(errorMessage)
				running.Value = false
			end
		else
			running.Value = false
		end
	end
end)

Here is the script that runs it.

What can I do to fix this? I’ve been trying to mess around with delta time to see if that would fix the issue, although I’m not sure exactly what I’m doing to be honest.

Thanks!