How would I find out if a player is looking at an object?

Asked by

marfit 104

6 years ago

I've looked at WorldToScreenPoint and WorldToViewportPoint but I don't really think it is that effective considering my game still needs 3rd person. I don't really see raycasting as an option as to effectively consider the player's full viewing angle, we'd need a lot of rays. I don't need a method to be 100% accurate in actually being seen, but enough so that I don't have to look directly at the object.

plr:look(object) greatneil80 2647 — 6y

WorldToViewportPoint should do the job, even with third person, it returns a vector and a bool which is true if the vector is within the bounds of the viewport GoldAngelInDisguise 297 — 6y

So you mean "A character is facing towards an object", not "a player is looking at an object", because those are two different things. fredfishy 833 — 6y

Updated my response with your revised specifications fredfishy 833 — 6y

wow i wanna cry, big necrobump. greatneil80 2647 — 5y

Edit

What you actually want is "Character facing towards part", not "Player looking at part"

You can do this with vectors:

01player = game:GetService("Players").LocalPlayer
02character = player.Character or player.CharacterAdded:wait()
03torso = character:WaitForChild("Humanoid").RootPart
04target = workspace:WaitForChild("LookyLou")
05vectors = {}
06 
07 
08function dotProduct(a, b)
09    return a.x * b.x + a.y * b.y + a.z * b.z
10end
11 
12 
13function getAngle(a, b)
14    return math.acos(dotProduct(a, b) / (a.magnitude * b.magnitude))
15end
16 
17 
18function drawVector(position, angle, magnitude, name)
19    if vectors[name] then
20        vectors[name]:Destroy()
21    end
22 
23    local p = Instance.new("Part")
24    p.Anchored = true
25    p.Size = Vector3.new(0.1, 0.1, magnitude)
26    p.CFrame = CFrame.new(position + angle * magnitude / 2, position + angle)
27    p.CanCollide = false
28    p.Parent = workspace
29 
30    vectors[name] = p
31end
32 
33 
34game:GetService("RunService").RenderStepped:Connect(function()
35    local torsoAngle = torso.CFrame.lookVector
36    local targetVector = torso.Position - target.Position
37    local flatTorsoAngle = Vector3.new(torsoAngle.x, 0, torsoAngle.z)
38    local flatTargetVector = Vector3.new(targetVector.x, 0, targetVector.z)
39    drawVector(torso.Position - Vector3.new(0, 2.5, 0), flatTorsoAngle, flatTargetVector.magnitude, "torso")
40    drawVector(target.Position, flatTargetVector.unit, flatTargetVector.magnitude, "target")
41 
42    local angle = math.deg(getAngle(-flatTorsoAngle, flatTargetVector))
43    if angle > 40 then
44        target.BrickColor = BrickColor.new("Bright red")
45    else
46        target.BrickColor = BrickColor.new("Bright green")
47    end
48end)
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Put a brick in the workspace called "LookyLou" -- it will go red when you're within 40 degrees of facing it.

How would I find out if a player is looking at an object?

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