How to check if there are any player infront on me

Help and Feedback Scripting Support
#1

Hello, i wanted to write script that detects if there are any players in area infront on me. I know how to check if they are close enough (i mean radius) but i don’t know how to check if they are in angle of my “pizza slice”. Could you help me?
image

How to check if there is any player infront of me without seeing through walls?
#2

https://developer.roblox.com/en-us/api-reference/function/Camera/WorldToScreenPoint
https://developer.roblox.com/en-us/api-reference/function/Camera/WorldToViewportPoint

#3

I don’t understand this at all :confused:

#4

Vector:Dot is it

local function AngleBetween(vectorA, vectorB)
	return math.deg(math.acos(math.clamp(vectorA:Dot(vectorB), -1, 1)))
end

AngleBetween(Vector3.new(0,0,0),Vector3.new(0,0,1)) -- will be 90 degrees
#5

Thanks!
It seems

  1. It detects angle not connected with player CFrame but the othe angle (i don’t understand between what is this angle)
  2. It returns only 0,90,180 deg angles.
    Do you have any idea how to do this better/other way?
    image
#6

it uses dot so it detects vector directions rather than using orientation (cant really explain it)

Did u change the vectors inside the function?
make sure its not the as i did inside the example script

1 Like
#7

Here is an module i made a while ago
https://www.roblox.com/library/8543928110/InFov

InFovModule.IsInFov(Object : Instance, Position : Vector3, NormalId : Enum, FieldOfViewMax : Number)
1 Like
#8

You can use the Dot product to achieve this.
Here’s a quick visualization:

image
image861×753 46.2 KB

You can start by creating an empty table that lists all the players that are in the area.

local playersInFOV = {}

Get your own humanoidRootPart
And loop through all available players per frame.

local runService = game:GetService("RunService")
local localPlayer = game.Players.LocalPlayer
local character = localPlayer.Character or localPlayer:CharacterAdded:Wait()
local rootPart = character:WaitForChild("HumanoidRootPart", 20) --Get your RootPart

local playersInFOV = {}

runService.HeartBeat:Connect(function()
  for i, player in pairs(game.Players:GetPlayers()) do
     if player ~= localPlayer and player.Character ~= nil then
        -- Get the other player's humanoidRoot
        local otherPlayerRoot = player.Character:FindFirstChild("HumanoidRootPart")
        if otherPlayerRoot then
           -- Get the unit vector between the otherPlayer and yourself
           -- And get the look vector of yourself
           local selfToOtherPlayer = (otherPlayerRoot.Position - rootPart.Position).Unit
           local lookVector = rootPart.CFrame.LookVector

           -- And you can easily get the dot product by:
           local dotProduct = lookVector:Dot(selfToOtherPlayer)
           
           -- Based on the visualization: we can get our FOV if the dot product is above 0.5
           -- And lastly list them in your table of players in FOV
           if dotProduct >= 0.5 then
              if not table.find(playersInFOV, player) then
                  table.insert(playersInFOV, player)
              end
           else
               -- Remove them if they are out of range
               local check = table.find(playersInFOV, player)
               if check then
                   table.remove(playersInFOV, check)
               end
           end
        end
     end
  end
end)

Now you have your lists of players that are on your Field of View. You can continue from there on.

Hope this helps cheers!

2 Likes
#9

This is a really good video explaining how the dot product works

2 Likes
#10

Thanks man! You did explain it very clearly, i’m very thankful :slight_smile:

1 Like