Checking if the player is infront of another player

Help and Feedback Scripting Support
#1

I’m making a combat system that uses magnitude and im trying to see if the player is infront of the other player that he’s hitting I searched about this topic and found some topics relating this and I did find the way to check the angle between the 2 players, but my problem here is that I cant seem to figure out the right numbers in order to see if the player is infront of him, I tried some numbers but the script printed “infront of the player” when i was indeed behind him and some spots just didnt count regardless of me being infront of him

Here’s the script:

local player = game.Players.LocalPlayer



game:GetService("UserInputService").InputBegan:Connect(function(input, gpe)
	if gpe then return end
	
	if input.KeyCode == Enum.KeyCode.F then
		local looking = player.Character.HumanoidRootPart.CFrame.lookVector

		local direction = (workspace.Dummy.HumanoidRootPart.Position - player.Character.HumanoidRootPart.Position).Unit


		local dot = looking:Dot(direction)
		local angle = math.acos(dot) 
		angle = math.deg(angle) 
		
		if math.floor(angle) <= 11 and math.floor(angle) >= 6 then
			print("infront")
		end
		
	end
end)

If anybody have done this before or knows the correct numbers that would be highly appreciated.

3 Likes
#2

Hi, you can use workspace.CurrentCamera:WorldPositionToScreenPoint(target pos) this gives you to info, position on screen and boolean which mean like position on screen or no. Thats what you need

#3 
local relPos = player.Character.HumanoidRootPart.CFrame:PointToObjectSpace(workspace.Dummy.HumanoidRootPart.Position)

if (relPos.Z < 0) then
	print("dummy is in front of player")
else
	print("dummy is behind player")
end
1 Like
#4

It prints dummy is infront of the player regardless of where I am.

#5

I didnt quite understand what you mean, Can you give me an example code?

#6

Sure
local ScreenPos, OnScreen = workspace.CurrentCamera:WorldPositionToScreenPoint(target.Position)
if OnScreen == true then
print(“Dummy on screen”)
end

#7

Im not trying to check if the dummy is on screen, Im trying to check if my player is facing the dummy

#8

Oh sorry, so you need get angle between vectors?

#9

Yes thats what im looking for.

#10

MathThing
MathThing1756×814 13.2 KB

So by this formula you gets cos between vectors, for get angle you need put number which you get to this: math.deg(math.acos(your number))

#11

In the post I clarified that I was able to get the angle between 2 players my problem is that the output number is not consistent and I cant be 100% sure if the player is really facing the player or not

#12

Anyway try this formula, i using it for check rickoshet at my game this never gived me wrong number, so its must work

#13

By number do you mean (workspace.Dummy.HumanoidRootPart.Position - player.Character.HumanoidRootPart.Position)?

#14

No, at number i mean cos which we gets from this formula

#15

I dont understand even a tad bit of that formula

#16

You can determine this based on the dot product of the other player’s location.

local thisPlayer: (Player) = game.Players.LocalPlayer
local otherPlayer: (Player) = game.Players.Megumin

local function isPlayerInFrontOfPlayer(player1: (Player), player2: (Player)): bool
	local dirToOtherPlayer: (Vector3) = (player2.Character.PrimaryPart.Position - player1.Character.PrimaryPart.Position).unit
	return player1.Character.PrimaryPart.CFrame.LookVector:Dot(dirToOtherPlayer) > 0.45
end

print(isPlayerInFrontOfPlayer(thisPlayer, otherPlayer))

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The dot product, in simple terms, provides a “percentage” (-1 to 1) of how close two vectors are to being parallel. 1 = parallel and 0 = perpendicular. -1 = going in opposite directions.

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11 Likes
#17

You know what is vectors and cos in geometry and trigonometry?

#18

Is there any way to make the blue line to move in the same direction as the red line, for instance: 0.2’s red line = 0.2’s blue line