How to check if player is looking at NPC?

Help and Feedback Scripting Support
1

I want to check if player is looking at NPC. This script doesn’t seem to work. It is my first time using WorldToScreenPoint.

for i,v in pairs(workspace:GetChildren()) do
			if v.ClassName == "Model" then
				local character = v:findFirstChildOfClass("Humanoid").Parent
				if character.Humanoid then
					if character.Humanoid.Health > 0 then
						if (character.Head.Position - script.Parent.HumanoidRootPart.Position).magnitude < 60 then
							local onScreen = camera:WorldToScreenPoint(script.Parent.HumanoidRootPart.Position)
							if onScreen then
								looking = true
							else
								looking = false
							end
						end
					end
				end
			end
		end

Thanks for help.

2

That is because :WorldToScreenPoint() returns 2 things.
A vector that represents the offset from the top left corner of the screen.
And then a bool value that tells whether it’s on screen or not.
You haven’t put the onScreen variable in the right order.
Use:

         for i,v in pairs(workspace:GetChildren()) do
			if v.ClassName == "Model" then
				local character = v:findFirstChildOfClass("Humanoid").Parent
				if character.Humanoid then
					if character.Humanoid.Health > 0 then
						if (character.Head.Position - script.Parent.HumanoidRootPart.Position).magnitude < 60 then
							local vector, onScreen = camera:WorldToScreenPoint(script.Parent.HumanoidRootPart.Position)
							if onScreen then
								looking = true
							else
								looking = false
							end
						end
					end
				end
			end
		end

I have basically put onScreen in the right order (as the secondary variable).

3

I have changed the script a bit and now it always prints false, no matter what.
Note: server script is a child of NPC.

game.Players.PlayerAdded:Connect(function(player)
	while wait(0.1) do
		print(looking)
		looking = false
		wait(0.1)
		for i,v in pairs(workspace:GetChildren()) do
			if v.ClassName == "Model" then
				local character = v:findFirstChildOfClass("Humanoid").Parent
				if character.Humanoid and character ~= script.Parent and character ~= player.Character then
					if character.Humanoid.Health > 0 then
						local vector, onScreen = camera:WorldToScreenPoint(script.Parent.HumanoidRootPart.Position)
						if onScreen then
							print(character.Name)
							looking = true
						else
							looking = false
						end
					end
				end
			end
		end
	end
end)
4

I didn’t understand correctly what you were asking.
Though, there is a way to do that, using the Dot Product.

5

I want to check if NPC is players’ on screen.