├── FieldOfViewEditor.cs
├── README.md
└── FieldOfView.cs


/FieldOfViewEditor.cs:
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 1 | using UnityEditor;
 2 | using UnityEngine;
 3 | 
 4 | [CustomEditor(typeof(FieldOfView))]
 5 | public class FieldOfViewEditor : Editor
 6 | {
 7 |     private void OnSceneGUI()
 8 |     {
 9 |         FieldOfView fov = (FieldOfView)target;
10 |         Handles.color = Color.white;
11 |         Handles.DrawWireArc(fov.transform.position, Vector3.up, Vector3.forward, 360, fov.radius);
12 | 
13 |         Vector3 viewAngle01 = DirectionFromAngle(fov.transform.eulerAngles.y, -fov.angle / 2);
14 |         Vector3 viewAngle02 = DirectionFromAngle(fov.transform.eulerAngles.y, fov.angle / 2);
15 | 
16 |         Handles.color = Color.yellow;
17 |         Handles.DrawLine(fov.transform.position, fov.transform.position + viewAngle01 * fov.radius);
18 |         Handles.DrawLine(fov.transform.position, fov.transform.position + viewAngle02 * fov.radius);
19 | 
20 |         if (fov.canSeePlayer)
21 |         {
22 |             Handles.color = Color.green;
23 |             Handles.DrawLine(fov.transform.position, fov.playerRef.transform.position);
24 |         }
25 |     }
26 | 
27 |     private Vector3 DirectionFromAngle(float eulerY, float angleInDegrees)
28 |     {
29 |         angleInDegrees += eulerY;
30 | 
31 |         return new Vector3(Mathf.Sin(angleInDegrees * Mathf.Deg2Rad), 0, Mathf.Cos(angleInDegrees * Mathf.Deg2Rad));
32 |     }
33 | }
34 | 


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/README.md:
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 1 | # FieldOfView
 2 | A simple Field of View system for the Unity Engine with target detection and obstacle blocking
 3 | 
 4 | # How To Use
 5 | - Import both scripts into your project
 6 | 
 7 | - Ensure FieldOfViewEditor is inside of the Editor folder inside of Unity or else your build will fail to compile!
 8 | 
 9 | - Set up two new Layers, one for your Target objects and one for your Obstacle objects
10 | 
11 | ![New Layers](https://i.imgur.com/4H19Eg4.png)
12 | 
13 | - Set your player (target) to be on the Target layer
14 | 
15 | - Set any obstacles that block the enemies field of view to be on the Obstacle layer
16 | 
17 | ![Field Of View Inspector](https://i.imgur.com/PW20aYg.png)
18 | 
19 | - Attach the FieldOfView script to your Enemy
20 | 
21 | - Configure the view radius and angle properties to your liking
22 | 
23 | ![Field Of View Inspector](https://i.imgur.com/q0Ovpzw.png)
24 | 
25 | - Set the target layer mask to be your Target layer
26 | 
27 | - Set the obscruction layer mask to be your Obstacle layer
28 | 
29 | 
30 | ## FAQ
31 | 
32 | **Why isnt my raycast detecting the player / obstacles?**  
33 | Check your objects have colliders, Raycasts need to hit colliders to work  
34 | Check your objects are assigned to the correct layers  
35 | Check your FieldOfView script is looking at the right layers in the inspector
36 | 
37 | **Why is my build failing with these scripts?**  
38 | FieldOfViewEditor needs to be inside a folder called Editor
39 | 


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/FieldOfView.cs:
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 1 | using System;
 2 | using System.Collections;
 3 | using System.Collections.Generic;
 4 | using UnityEngine;
 5 | 
 6 | public class FieldOfView : MonoBehaviour
 7 | {
 8 |     public float radius;
 9 |     [Range(0,360)]
10 |     public float angle;
11 | 
12 |     public GameObject playerRef;
13 | 
14 |     public LayerMask targetMask;
15 |     public LayerMask obstructionMask;
16 | 
17 |     public bool canSeePlayer;
18 | 
19 |     private void Start()
20 |     {
21 |         playerRef = GameObject.FindGameObjectWithTag("Player");
22 |         StartCoroutine(FOVRoutine());
23 |     }
24 | 
25 |     private IEnumerator FOVRoutine()
26 |     {
27 |         WaitForSeconds wait = new WaitForSeconds(0.2f);
28 | 
29 |         while (true)
30 |         {
31 |             yield return wait;
32 |             FieldOfViewCheck();
33 |         }
34 |     }
35 | 
36 |     private void FieldOfViewCheck()
37 |     {
38 |         Collider[] rangeChecks = Physics.OverlapSphere(transform.position, radius, targetMask);
39 | 
40 |         if (rangeChecks.Length != 0)
41 |         {
42 |             Transform target = rangeChecks[0].transform;
43 |             Vector3 directionToTarget = (target.position - transform.position).normalized;
44 | 
45 |             if (Vector3.Angle(transform.forward, directionToTarget) < angle / 2)
46 |             {
47 |                 float distanceToTarget = Vector3.Distance(transform.position, target.position);
48 | 
49 |                 if (!Physics.Raycast(transform.position, directionToTarget, distanceToTarget, obstructionMask))
50 |                     canSeePlayer = true;
51 |                 else
52 |                     canSeePlayer = false;
53 |             }
54 |             else
55 |                 canSeePlayer = false;
56 |         }
57 |         else if (canSeePlayer)
58 |             canSeePlayer = false;
59 |     }
60 | }
61 | 


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