How make field of sight with obstacles?

How to make field of sight for Enemy? [Unity]& CreeX window.dataLayer = window.dataLayer || []; function gtag() { dataLayer.push(arguments); } gtag('js', new Date()); gtag('config', 'G-SN0C4Q7Q90'); (function (m, e, t, r, i, k, a) { m[i] = m[i] || function () { (m[i].a = m[i].a || []).push(arguments) }; m[i].l = 1 * new Date(); k = e.createElement(t), a = e.getElementsByTagName(t)[0], k.async = 1, k.src = r, a.parentNode.insertBefore(k, a) }) (window, document, "script", "https://mc.yandex.ru/metrika/tag.js", "ym"); ym(70876633, "init", { clickmap: true, trackLinks: true, accurateTrackBounce: true }); Home About us Team Twitchcreex_tm Twittercreex_tm Facebookcreex_tm PROGRAMMING How to make Field of Sight with obstacles? JANUARY 16TH, 2021 Determining whether an object is in the field of view of another object is quite common in the field of game development. Let's say we have a certain angle and distance at which this object can see other objects. It makes no sense to mindlessly shoot rays in all directions to determine whether this object is included in the field of view. And you don't need to distribute them around this corner, after a certain step. For ease of understanding, the picture will show the 2D version of the field of view, for 3D the situation is identical. Let's look at the picture. In order for us to reward the ability to detect any object, we will introduce an interface: âIDetectableâ, which will be responsible for executing the logic of the object that we saw. public interface IDetectable { void Detect(); void UnDetect(); Vector3 GetPosition(); GameObject GetGameObject(); } We also introduce an abstract class âDetectionAreaâ, object scopes, why abstract? Everything so that in the future it would be possible to enter not only a spherical field of view, but also other shapes. In an abstract class, all objects that are currently in scope are stored. public abstract class DetectionArea : MonoBehaviour { public abstract void Create(float distance, Vector3 center); private List _detectables = new List (); public IEnumerable GetDetectableInArea() { return _detectables; } public void OnTriggerEnter(Collider other) { if (!other.gameObject.TryGetComponent (out var detectable)) return; _detectables.Add(detectable); } public void OnTriggerExit(Collider other) { if (!other.gameObject.TryGetComponent (out var detectable)) return; _detectables.Remove(detectable); } } We will also introduce the implementation of the spherical scope, into which the visibility distance and the local point from which the radius of the sphere goes. [RequireComponent(typeof(SphereCollider))] public class SphereDetectionArea : DetectionArea { private SphereCollider _collider; private void Start() { _collider = gameObject.GetComponent (); } public override void Create(float distance, Vector3 center) { _collider.isTrigger = true; _collider.radius = distance; _collider.center = center; } } The main logic is in the abstract class CanDetect. In the Detection class, we iterate over each object in the field of view by distance, calculate the distance to it and the direction. var direction = (detectableObject.GetPosition() - currentPosition); var distance = Vector3.Distance(detectableObject.GetPosition(), currentPosition); Then we release the beam from the object to another object to check if there are obstacles between them. If there are obstacles, we tell the object that it was not found. if (!Physics.Raycast(currentPosition, direction, out var hit, distance)) { detectableObject.UnDetect(); continue; } Otherwise, we check if the object is in sight by the corner. if (!(Vector3.Angle(_transform.right, direction.normalized) < FieldOfView / 2f)) { detectableObject.UnDetect(); continue; } If he is not in this visibility zone, we also send him a signal that he was not detected. Otherwise, we send him the status of being discovered. This whole method works in a coroutine, which we can stop / start by calling the methods: StartWatching, StopWatching. We can change the distance and angle of view at any moment of the game. public abstract class Detection : MonoBehaviour { [SerializeField] private DetectionArea DetectionArea; [SerializeField] private float Distance = 1f; [SerializeField] private float FieldOfView = 30; [SerializeField] private Vector3 Center = Vector3.zero; private Transform _transform; public abstract void StartWatching(); public abstract void StopWatching(); private void Start() { if(_transform == null) _transform = gameObject.GetComponent (); if (DetectionArea != null) DetectionArea.Create(Distance, Center); } private protected IEnumerator WatchDetectionArea() { while (true) { var currentPosition = _transform.position; foreach (var detectableObjects in DetectionArea.GetDetectableInArea()) { var direction = (detectableObjects.GetPosition() - currentPosition); var distance = Vector3.Distance(detectableObjects.GetPosition(), currentPosition); if (!Physics.Raycast(currentPosition, direction, out var hit, distance)) { detectableObjects.UnDetect(); continue; } if (hit.transform.gameObject != detectableObjects.GetGameObject()) { detectableObjects.UnDetect(); continue; } if (!(Vector3.Angle(_transform.right, direction.normalized) < FieldOfView / 2f)) { detectableObjects.UnDetect(); continue; } detectableObjects.Detect(); } yield return new WaitForFixedUpdate(); } } } In my script, the launch of this script is done using add. Enemy class that inherits from Detection class public class Enemy : Detection { private Coroutine _watching; public override void StartWatching() { if (_watching != null) return; _watching = StartCoroutine(WatchDetectionArea()); } public override void StopWatching() { if (_watching == null) return; StopCoroutine(_watching); _watching = null; } } Now, any object that implements the IDetectable interface will execute its logic when it enters the field of view of an object that implements the CanDetect class, while we can also place the logic on an object that detects other objects, but in this tutorial, we did not do this, so how our goal was to make exactly the field of view, which will depend on the environment, distance and viewing angle. Main Links Home About us Team Social Links Facebook Twitter Twitch Discord Get in Touch! 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How make field of sight with obstacles?

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How make field of sight with obstacles?

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