Attempt to use raycast for the first time, but it is not working?

Hello, I have been trying to see whether a player is under a part, so I've been trying to use raycast. I've never used it before, so the problem here might be really simple. I looked at the developer's page on it and copied some of the script there directly to mine, so idk what's going on :)

here is my script:

local function rayCast(origin,direction,ignoreTable)
	local raycastParams = RaycastParams.new()
	raycastParams.FilterDescendantsInstances = ignoreTable
	raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
	local raycastResult = workspace:Raycast(origin,direction,raycastParams)
	if raycastResult then
		if not raycastResult.Instance.Parent:IsA("Accessory") then
			game.Lighting.FogEnd = 100000000
		else
			game.Lighting.FogEnd = 100
		end
	else
		game.Lighting.FogEnd = 100
	end
end


game.Players.PlayerAdded:Connect(function(player)
	local char = player.Character or player.CharacterAdded:Wait()
	local head = char:WaitForChild("Head")
	while wait() do
		rayCast(head.Position,Vector3.new(0,-50,0),{workspace.Baseplate})
	end
end)

thank you for reading :)