basic esp

hook.Add("PreDrawHalos", "tylerb_amazing_hack", function()
    for k,v in pairs(player.GetAll()) do
        halo.Add( {v}, team.GetColor(v:Team()), 2, 2, 2 )
        --halo.Add( {v}, Color(255, 255, 255), 1, 1, 1 )
    end
end)

hook.Add("HUDPaint", "tylerb_amazing_hack", function()
    for k,v in pairs(player.GetAll()) do
        local spec = v:GetNoDraw() or v:GetColor().a == 0
        local alert = math.Clamp(v:GetPos():Distance(LocalPlayer():GetPos())/4,0,255) + (spec and -255 or 0)
        local str = (v:GetUserGroup() != "user" and "ADMIN: " or "") .. v:Name()..": "..math.floor(v:GetPos():Distance(LocalPlayer():GetPos())).." units, NoDraw: "..(spec and "YES" or "no")

        surface.SetFont("ChatFont")
        surface.SetTextColor(Color(255 - alert,alert,0))
        surface.SetTextPos(16,16 * k)
        --surface.DrawText(str)

        if string.lower(v:GetModel()) == "models/error.mdl" then
            v:SetModel("models/player/kleiner.mdl")
        end

        if v == LocalPlayer() then continue end

        local pos = (v:GetPos() + Vector(0,0,64)):ToScreen()
        x = surface.GetTextSize(str)
        surface.SetTextPos(pos.x - x/2, pos.y)
        surface.DrawText(str)
    end
end)

hook.Remove("PreDrawHalos", "AddHalos")