How do I make math.sin less extreme but still goes to the same CFrame where it started?

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#1

Hello, I have been working on an FPS framework but I am having some problems with it since I want it to start it’s original point and end at the opposite point/2, How do I do that?

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#2

What are you talking about? What is the “it”? Are you talking about the bullet trail or something?

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#3

Sorry, I am bad at explaining since what I want is hard to explain but here is a video that might explain it:


Code:

local plr = game.Players.LocalPlayer
local character = plr.Character or plr.CharacterAdded:Wait()
local humanoid = character:WaitForChild('Humanoid')
local rs = game:GetService('RunService')
local mouse = plr:GetMouse()
local cam = workspace.Camera
local viewModel = game.ReplicatedStorage.Pistol:Clone()
viewModel.Parent = cam
local cf = CFrame.new()
cf = CFrame.new(1.5,-1,1.5)
local idle = viewModel.AnimationController:LoadAnimation(viewModel.Animations.Idle)
idle:Play()
mouse.Button1Down:Connect(function()
	local animation = viewModel.AnimationController:LoadAnimation(viewModel.Animations.Shoot)
	animation:Play()
end)

rs.RenderStepped:Connect(function()
	viewModel:SetPrimaryPartCFrame(cam.CFrame * cf)
	if humanoid.MoveDirection.Magnitude > 0 then
		local Y
		local Time = tick()
		if math.sin(Time*3)>=0 then
			Y = -math.sin(Time * 3)
		else
			Y = math.sin(Time * 3)
		end
		cf = cf:Lerp(CFrame.new(1.5 *math.sin(Time*3)/3,-1+Y/3,1.5),0.1)
	else
		cf = cf:Lerp(CFrame.new(1.5,-1,1.5),0.1)
	end
end)
#4

It basically goes too far away from it’s original position (I am talking about the view model).

#5

Theres a couple different parts to a sine wave, two of which are probably relevant to what youre doing

  1. Amplitude
  2. Frequency

Amplitude is how high a sine wave goes
High amplitude:

image
image1043×779 36.8 KB

Low Amplitude:
image
image987×496 15.3 KB

Frequency is how quickly it oscillates
High frequency:

image
image903×306 33.2 KB

Low frequency:
image
image1224×339 17.6 KB

A general formula you can use for sine waves is, where F is frequency and A is amplitude:

y = sin(x * F) * A

So in your case, to lower the amplitude you would simply substitute a low fraction or decimal in for A

math.sin(3 * x) * 0.25

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#6

Thank you, but how can I implement it into my system?
Like this?

local plr = game.Players.LocalPlayer
local character = plr.Character or plr.CharacterAdded:Wait()
local humanoid = character:WaitForChild('Humanoid')
local rs = game:GetService('RunService')
local mouse = plr:GetMouse()
local cam = workspace.Camera
local viewModel = game.ReplicatedStorage.Pistol:Clone()
viewModel.Parent = cam
local cf = CFrame.new()
cf = CFrame.new(1.5,-1,1.5)
local idle = viewModel.AnimationController:LoadAnimation(viewModel.Animations.Idle)
idle:Play()
mouse.Button1Down:Connect(function()
	local animation = viewModel.AnimationController:LoadAnimation(viewModel.Animations.Shoot)
	animation:Play()
end)

rs.RenderStepped:Connect(function()
	viewModel:SetPrimaryPartCFrame(cam.CFrame * cf)
	if humanoid.MoveDirection.Magnitude > 0 then
		local Y
		local Time = tick()
		if math.sin(Time*3)>=0 then
			Y = -math.sin(Time * 3)
		else
			Y = math.sin(Time * 3)
		end
		cf = cf:Lerp(CFrame.new(math.sin(3 * tick()) * 0.25,-1+Y/3,1.5),0.1)
	else
		cf = cf:Lerp(CFrame.new(1.5,-1,1.5),0.1)
	end
end)
#7

From what I understand about the operation of your code that implementation should work

1 Like
#8

Here is what happens when I test it:


It goes away from it’s original position

#9

I think you just have to add 1.5 to the sin component, outside like this

CFrame.new(1.5 + math.sin(3 * tick()) * 0.25,-1+Y/3,1.5)

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#10

Thank you very much! It works like a charm!