How to make a ray cast downwards?

Hi!

So I want to cast a ray from a part in the player's Character. The script casts the ray but the problem is the ray goes forward, not downward like I want it to. I'm using lookVector so I tried rotating the part but the ray still goes forward. Any idea why?

local player = game.Players.LocalPlayer
local char = player.Character
local LookPart = char:WaitForChild("Chest1"):WaitForChild("Look")
while true do
    wait(1)
    local ray = Ray.new(LookPart.CFrame.p, LookPart.CFrame.lookVector * 300)
end