How would i raycast at an FOV on the x axis

[iFlameyz (Flameyz)]

Im making a first person game, and im making the raycast origin the players head, and i need a raycast for every degree in the fov (70 degrees by default/raycasts) so how would i do that?

I thought of some option but im not confident about them, maybe there’s a better way?

for i = -35, 35 do
	local direction = ???? (Thinking of the heads LookVector * distance of the ray, but how would i rotate the direction)
				
	local raycastResult = workspace:Raycast(head.Position, direction, raycastParams)	

	if raycastResult then
		print("Raycast hit!")
	end
end

I don’t know how to rotate it tho, i know i could do Head.CFrame * CFrame.Angles(0, math.rad(i), 0) but that returns as a CFrame not a vector and i wouldnt know where to put it in the direction variable, any help would be appreciated, btw here’s a sketch

also i think the degrees are right, correct me if im wrong

[DataSigh]

Why do you need that many raycasts?

[iFlameyz (Flameyz)]

im recreating the weeping angel effect aka scp 173, i need to see if the player is looking at him ig

[nicemike40]

Do you want “is on the player’s screen” or do you want “is the character vaguely facing towards”?

[iFlameyz (Flameyz)]

Wouldn’t it be the same since the game is in first person?

[DataSigh]

You could use a linear algebra method to detect that. Something like this detection right?

[iFlameyz (Flameyz)]

Yeah something like that, but i would need more of the red “lines” for accuracy in first person

[DataSigh]

I’m not casting any rays here, I’ll show u the code for it 2 seconds

[nicemike40]

I guess I missed the “in first person” part

You could use this awesome method:

How to detect if part is on screen (not position)

What if we based whether or not the part is on screen on two different conditions: Condition 1 - A vertex of the part is on the screen, in which case WorldToViewportPoint works just fine Condition 2 - No vertices of the part are visible, but if we flatten every edge of the part to the plane of the camera, at least one of the edges intersects with the edges of our camera. For both conditions, actually, we’ll need our vertices/corners of our part: local part = workspace.MagicalPart local cam =…

Or just call Camera:WorldToScreenPoint on the angel’s position as a rough approximation, then raycast toward it to check line of sight.

@DataSigh’s method of using Dot product will also work for a circular cone, but may not be perfect for detecting within a rectangle-shaped screen

[iFlameyz (Flameyz)]

@Knineteen19

Main problem with this method is it won’t work properly for meshes or other types of parts that aren’t rectangular prisms, but as long as you have some way of getting each individual vertex, the rest should still work, theoretically anyway.

Welp im using a mesh so i guess i can’t do this, also thought about the cone approach but i’ll use it as my last option if i have to ill try the Camera:WorldToScreenPoint tho

[iFlameyz (Flameyz)]

If i did the Camera:WorldtoScreenPoint it would be on the client and i would have to fire a lot of remote events to see if the player sees the object or not, which is exploitable, any way to fix that?

[nicemike40]

@iFlameyz

Welp im using a mesh so i guess i can’t do this

It would be a good approximation still, and you could use one or two parts as the “visibility checker” proxy parts that were welded to the angle and invisible. You could also get the list of vertices of the mesh and use those in the script, but that’s more work.

@iFlameyz

i would have to fire a lot of remote events to see if the player sees the object or not, which is exploitable, any way to fix that?

One way or another you’re trusting the client. Like you could create a dummy camera on the server that you put at the same CFrame as a client’s and call the method on the dummy camera instead… but then how do you know the client isn’t sending you bogus camera CFrames? Ultimately roblox trusts the client implicitly because they handle their own physics. Not much you can do.