Best Way to Go About NPC Detection

[Icey_CD (Icey)]

I am making an NPC detection thing and I know that I can just use magnitude and raycasting to see if an NPC can detect a player, I was thinking I would have to use RunService to do this but that seems like it would be a bit inefficient performance wise. The magnitude would not be costly I don’t think but if there is a player within range that means it would be raycasting every frame which doesn’t seem too performant. Any better ways or let me know if this isn’t actually very performance inefficient?

[RobloxHasTalentR (LOLLLLLLLLL_1)]

NPC detection can be something like

local RunService = game:GetService("RunService")
local players = game:GetService("Players")
local NPC = script.Parent -- Assuming this script is a child of the NPC
local detectionRadius = 50
local checkInterval = 0.5
local lastCheckTime = tick()

local function detectPlayers()
    for _, player in ipairs(players:GetPlayers()) do
        local character = player.Character
        local humanoidRootPart = character and character:FindFirstChild("HumanoidRootPart")
        if humanoidRootPart then
            local distance = (NPC.Position - humanoidRootPart.Position).magnitude
            if distance <= detectionRadius then
                -- Further checks (e.g., raycasting) can go here if needed
                print(player.Name .. " is within detection radius.")
            end
        end
    end
end

RunService.Heartbeat:Connect(function()
    if tick() - lastCheckTime >= checkInterval then
        lastCheckTime = tick()
        detectPlayers()
    end
end)

[Icey_CD (Icey)]

So you’re just suggesting adding a check wait time?

[RobloxHasTalentR (LOLLLLLLLLL_1)]

That could be it as the run service or something like heart beat every frame can be costly inefficient wise