How to make npc fov?

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#1

i want to do like a npc fov, like detecting if another npc/player goes into the fov
ive been trying the dot product but its confusing me, i want it to detect if a player/npc is in the fov

something like this
image

with the cone being the fov

ive been trying for about 3 days now, if anyone could help i would appreciate it

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A smart bot is looking for a player
#2

you need some sort of cone cast

the easiest way to do this is raycast a bunch of times in a shape of a cone and if any hits then its in range

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#3

I don’t know if the cone is a part if so you can check if anyone touched it

cone.Touched:Connect(function()
end)

#4

But it’d just clip through walls and detect people on the other side

#5

Find more tutorials on YouTube

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#6

you can do if it touched another part or wall it will like shrink or something

cone.Touched:connect(function(hit)
    if hit.Name == "wall" then
    --do anything here
end)
#7

But it will shrink unaccordingly so it wont work. Best way is to just use lots o’ raycasting…

#8

yeah I mean if it stops touching the wall you can shrink it back by the size

cone.size

cone.TouchEnded:Connect(function(hit)
    if hit.Name == "wall" then
end)
#9

But you wont even get where the wall hit it. Or even where to shrink it. I dont even know if theres a “touchended” event.
devforum argument go brrrr

#10

the best way is not to use “lots o’ raycasting” because that’s very bad for performance and sometimes not effective. Instead he should just use the dot product and loop through all players/npcs and also a ray to detect if there’s a wall.

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#11

ok bro just watch a video I don’t know about Ray-Casting

#12

touched is inconsistent should not be used in this way

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#13

Edit: If a player leaves, any other code you add to this script may break (Kind of obvious but just want to clarify for any new scripters who may stumble across this post)

@incognitobot_rblx 's works but you I you might have to change the value depending on how much you want your npc to see. :Dot() goes from -1 to 1, so if you want to have say 70 degrees of fov, you would have this (Code goes inside npc. You can undo the comments on the prints if you want a visual output, but you can also use the “playersseen” table to detect which players are in the npc’s fov. Note that this code does not care about range.):

local rs = game:GetService("RunService")

local npc = script.Parent
local npcfov = 70
local playersseen = {}

print(0.5 - (npcfov/2)/100)
print(0.5 + (npcfov/2)/100)
print(1-(1/90 * npcfov/2))
--Explaination:
--NOTE THAT THE "NPCFOV" MAY NOT BE TRUE FOV, BECAUSE I HAVE NO IDEA HOW IT WORKS LOL
--THE "NPCFOV" IS JUST THE AMOUNT OF "DEGREES" THE NPC CAN SEE
--When the player is right in front of the npc (90 degrees), the dot product returns 1
--As it approaches 0 and 180 degrees, the dot product goes toward 0
--Hence in order to get the 70 degrees of fov, you first need to find the conversion for the degrees
--Then you multiply it by half of the fov (half for each side)
--We should now get the converted value of 35 degrees (if npcfov is 70)
--Next, we subtract by 1 because we need to get 35 degrees from the "straight ahead"
--Ik my explaination is not very good, so if anyone has a better explaination feel free to reply to my post


rs.Heartbeat:Connect(function()
	local head = npc:WaitForChild("Head")
	local npclv = head.CFrame.LookVector
	
	for _, player in pairs(game.Players:GetPlayers()) do
		local character = player.Character
		if character then
			local npctoplayer = (character:WaitForChild("Head").Position - head.Position).Unit
			local dotproduct = npctoplayer:Dot(npclv)
			--print(dotproduct)
			if dotproduct > 1-(100/90 * npcfov/2)/100 then
				--print("In FOV")
				if not table.find(playersseen, player) then
					table.insert(playersseen, player)
				end
			else
				--print("Off FOV")
				if table.find(playersseen, player) then
					table.remove(playersseen, table.find(playersseen, player))
				end
			end
		else
			--print("Off FOV")
			if table.find(playersseen, player) then
				table.remove(playersseen, table.find(playersseen, player))
			end
		end
	end
end)
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How do i give a part a front side vision?
#14

Edit: Math fixed, I hope this helps!

My math is incredibly wrong. I’ll be fixing it and editing in a second-

#15

can you make the enemies fov “collide with walls” so that when your behind a wall and in the npc’s fov then it will still print not in fov?

#16

You can use raycast to do that.