Roblox 服务端权威反作弊系统：变速齿轮、穿墙透视与物理空间校验

--!strict
local Players = game:GetService("Players")
local RunService = game:GetService("RunService")
local Workspace = game:GetService("Workspace")

local AntiCheatService = {}

type PlayerRecord = {
    lastPosition: Vector3,
    lastTick: number,
    anomalyBuffer: number,
    isFalling: boolean
}

local trackedPlayers: { [Player]: PlayerRecord } = {}
local RAY_PARAMS = RaycastParams.new()
RAY_PARAMS.FilterType = RaycastFilterType.Exclude

function AntiCheatService.InitPlayer(player: Player)
    local char = player.Character or player.CharacterAdded:Wait()
    local hrp = char:WaitForChild("HumanoidRootPart") :: BasePart
    trackedPlayers[player] = {
        lastPosition = hrp.Position,
        lastTick = os.clock(),
        anomalyBuffer = 0,
        isFalling = false
    }
end

function AntiCheatService.OnHeartbeat(dt: number)
    local now = os.clock()
    for player, record in pairs(trackedPlayers) do
        local char = player.Character
        if not char then continue end
        local hrp = char:FindFirstChild("HumanoidRootPart") :: BasePart?
        local humanoid = char:FindFirstChildOfClass("Humanoid")
        if not hrp or not humanoid or humanoid.Health <= 0 then continue end
        
        local currentPos = hrp.Position
        local displacement = (currentPos - record.lastPosition).Magnitude
        local maxAllowed = (humanoid.WalkSpeed * dt * 1.35) + 0.5
        
        if displacement > maxAllowed and not record.isFalling then
            record.anomalyBuffer += (displacement - maxAllowed)
            if record.anomalyBuffer > 15 then
                hrp.CFrame = CFrame.new(record.lastPosition)
                hrp.AssemblyLinearVelocity = Vector3.zero
                record.anomalyBuffer = 0
                continue
            end
        else
            record.anomalyBuffer = math.max(0, record.anomalyBuffer - (dt * 5))
        end
        
        RAY_PARAMS.FilterDescendantsInstances = { char }
        local dir = currentPos - record.lastPosition
        if dir.Magnitude > 0.1 then
            local hit = Workspace:Raycast(record.lastPosition, dir, RAY_PARAMS)
            if hit and hit.Instance and hit.Instance.CanCollide then
                hrp.CFrame = CFrame.new(record.lastPosition)
                hrp.AssemblyLinearVelocity = Vector3.zero
                continue
            end
        end
        record.lastPosition = currentPos
        record.lastTick = now
    end
end

RunService.Heartbeat:Connect(AntiCheatService.OnHeartbeat)
Players.PlayerAdded:Connect(AntiCheatService.InitPlayer)
return AntiCheatService