Ray not working as expected

[jaidon11 (Zeke)]

I’m trying to make a script that detects if the player is looking at a part within certain angles.
Detecting if an object is in front or if the player isn’t looking at it works except when the player is actually visually seeing the part it doesn’t seem to think so, how would I fix this but also take the object blocking view of the parts size into consideration?

local targetPart = script.Parent

local function isObjectBlocking(player)
	local head = player.Character and player.Character:FindFirstChild("Head")
	if not head then
		return false
	end

	local ray = Ray.new(
		head.Position,
		(targetPart.Position - head.Position).unit * (targetPart.Position - head.Position).magnitude
	)
	local hit, _ = workspace:FindPartOnRay(ray, player.Character)

	return hit and hit ~= targetPart
end

local function checkHeadDirection()
	for _, player in pairs(game.Players:GetPlayers()) do
		local character = player.Character
		if character and character:FindFirstChild("Humanoid") then
			local humanoid = character.Humanoid

			local head = character:FindFirstChild("Head")
			if head then
				local lookVector = (targetPart.Position - head.Position).unit
				local partNormal = targetPart.CFrame:pointToWorldSpace(Vector3.new(0, 0, -1)) - targetPart.Position
				partNormal = partNormal.unit

				local dotProduct = lookVector:Dot(partNormal)

				if dotProduct > 0.8 then
					if isObjectBlocking(player) then
						print(player.Name .. " is looking but object blocked")
					else
						print(player.Name .. " is looking")
					end
				else
					print(player.Name .. " is looking away")
				end
			end
		end
	end
end

local RunService = game:GetService("RunService")
RunService.Heartbeat:Connect(function()
	checkHeadDirection()
end)

[Boustifail]

Why not using workspace:Raycast instead?