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Detecting if a Monster has "Vision" of a player?

Asked by

9 years ago

I'm looking to make a stealth-based AI for a game that some friends and I are working on, although I don't know what to do for the monster's vision. My ideas so far have been:

Raycasting, I came up with this idea before I really knew what it was and realized I would have to do hundreds and hundreds of raycastings per second to cover the entire "FOV" of the monsters.

Welding cones made of corner bricks to the monster's face, problem with this is that the cone would make the monster turn slow.

Using a script to position cones from the above idea in-front of the monster's head, simulating a line of sight, while allowing the monster faster turning.

This is not a request site! xImmortalChaos 565 — 9y

No idea, good luck though. I would probably go forward with raycasting if I were you, since you wouldn't have to cover every area with rays since characters are kind of fat, they wouldn't be able to hide in small gaps. between rays. Perci1 4988 — 9y

@xImmortalChaos I'm not asking for someone to do the scripting, I'm asking if there's any other ways to do it. Fortunately @damagex443 was nice enough to give me an example script to use. bobder2 135 — 9y

@Perci1 Thanks for the feedback. I've got a functioning FOV system with help from @damagex443 that's using raycasting bobder2 135 — 9y

1 answer

Answered by

damagex443 325

9 years ago

I've actually made a script that does this, you can use it if you want.

local fov = 90 -- This is the monsters field of view
local dist = 50 -- This is the monsters view distance
local monster = script.Parent.Parent.Character.Head -- Change this to the monsters position

function MakeRay(startPos, endPos, show) -- Creates a new ray
        local ray = Ray.new(startPos, endPos)
        local obj, endPoint = Workspace:FindPartOnRay(ray)
        if show then -- This is for debugging. It will make the rays visible
            local rayPart = Instance.new("Part", Workspace)
            rayPart.Name          = "RayPart"
            rayPart.BrickColor    = BrickColor.new("Bright red")
            rayPart.Transparency  = 0.5
            rayPart.Anchored      = true
            rayPart.CanCollide    = false
            rayPart.TopSurface    = Enum.SurfaceType.Smooth
            rayPart.BottomSurface = Enum.SurfaceType.Smooth
            rayPart.formFactor    = Enum.FormFactor.Custom
            rayPart.Size          = Vector3.new(0.2, 0.2, dist)
            rayPart.CFrame        = CFrame.new(startPos, Vector3.new(endPos.x,1.5,endPos.z)) * CFrame.new(0, 0, -dist/2)
            game.Debris:AddItem(rayPart, 0.1) -- Add the part to Debris so it will remove itself after 0.1 second
        end
        return obj -- Return any found objects with ray
end

while true do
    local start = -180-(fov/2) -- Give the ray the right lookVector
    for t = start, start+fov, 5 do -- You can change the 5 to another number as long as it's dividable by the fov. This represents the distance between each endPoint of the ray.
        local target = monster.CFrame -- Set the target to yourself
                    * CFrame.new(dist*math.sin(math.rad(t)), monster.Position.Y, dist*math.cos(math.rad(t))) -- Add the radians
                    * monster.CFrame.lookVector -- Get the lookVector of the monster
        local hit = MakeRay(monster.CFrame.p, target, true) -- Create a new ray. Set the last value to false if you're done debugging.
        if hit then -- If the ray has a hit
            if hit.Parent:FindFirstChild("Humanoid") then -- If the hit is a humanoid
                print("Humanoid in sight")
            end
        end

    end
    game:GetService("RunService").RenderStepped:wait()
end

Thank you, this helps a lot! bobder2 135 — 9y

Detecting if a Monster has "Vision" of a player?

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