Roblox random camera sway

random-camera-sway.lua

local camera = workspace.CurrentCamera
local fixedCFrame = CFrame.new(0, 100, 0) -- CFrame of default looking direction/position
local rate = 1/5 -- Speed at which the camera will sway
local xSwayAngle = math.pi/9 -- X angle change interval
local ySwayAngle = math.pi/9 -- Y angle change interval
local rollAngle  = math.pi/18 -- Roll angle change interval

function update(t)
  local phi = math.pi/2 + math.noise(t*rate, 0) * xSwayAngle
  local theta = math.pi/2 + math.noise(t*rate, 10) * ySwayAngle
  local lookDir = Vector3.new(math.sin(theta)*math.cos(phi), math.cos(theta), math.sin(theta)*math.sin(phi))
  local backVec = -fixedCFrame:VectorToWorldSpace(lookDir)
  local upVec = Vector3.new(0, 1, 0)
  local rightVec = backVec:Cross(upVec)
  local newCF = CFrame.fromMatrix(fixedCFrame.p, rightVec, rightVec:Cross(backVec))
  camera.CFrame = newCF * CFrame.fromAxisAngle(backVec, math.noise(t*rate, 20) * rollAngle)
end

local t = 0
game:GetService("RunService"):BindToRenderStep("random-camera-sway", Enum.RenderPriority.Camera.Value, function(dt)
  t = t + dt
  update(t)
end)