How to detect if a HumanoidRootPart is in fov and distance of player?

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#1

Working on a punching system but I don’t wanna use a hitbox touched event so instead, I’m using magnitude and player FOV. I came across this, however, it isn’t working for me. Here is my script.

local db = false
local combo = 0
local event = script.Parent:WaitForChild("Punch")
local c = script.Parent.Parent
event.OnServerEvent:Connect(function()
	
	if db then return end
	if c.Humanoid.Health <= 0 then return end
	if c.Stunned.Value == true or c.IFrame.Value == true or c.AbilityBeingCast.Value == true then return end --this is just some checkups on the player, don't worry about this
	if combo == 0 then
		print("combo 0")
		for i, v in pairs(workspace:GetChildren()) do
			if v:FindFirstChild("Humanoid") then
				if v ~= c then
					print("humanoid found")
					local hrp = c.HumanoidRootPart
					local enemyHRP = v.HumanoidRootPart
					local enemyHum = v.Humanoid
					local magn = (hrp.Position - enemyHRP.Position).magnitude
					local radius = 5
					local angle = 45
					if magn <= radius then
						print("in radius")
						local dot = hrp.Position:Dot(enemyHRP.Position)
						print("dot") --prints this and every print() up to this
						if dot >= 0 and dot <= math.cos(math.rad(angle)) then
							print("humanoid in range") --never reaches this??
						end
						
					end
				end

			end
			
		end 
		
	end
	
end)
#2

Roblox has a built-in function that allows you to check if some position is on-screen if you want to take a less mathematical approach:

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

					if magn <= radius then
						print("in radius")
                        local vector, isOnScreen = camera:WorldToScreenPoint(hrp.Position)
						if isOnScreen then
                            print('humanoid in range')
                        end
					end
#3

my game is in 3rd person so it damages people if they are behind them with this method

#4

sorry for not stating it in the post, but I’m trying to make it only damage people in front of them as well, which is why I mentioned the player’s FOV

#5

Ahh okay, hmm.
I wonder if you could use ToObjectSpace to determine whether something is in front of the player or not:

local runService = game:GetService('RunService')

local humanoidRootPart: BasePart = script.Parent:WaitForChild('HumanoidRootPart')
local part = workspace:WaitForChild('ToCheck')

runService.RenderStepped:Connect(function()
	local hrpRelative = humanoidRootPart.CFrame:ToObjectSpace(part.CFrame)
	local partX = hrpRelative.Z
	local _, isOnScreen = workspace.CurrentCamera:WorldToScreenPoint(part.Position)
	if isOnScreen then
		if partX < 0 then
			print('In front')
		else
			print('Not in range!')
		end
	else
		print('Not in range!')
	end
end)
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