Пишем ИИ для игры. Часть 1: Как найти противников в поле зрения

public interface IFOV { float Radius { get; } float Angle { get; } Transform CurrentTargetTransform { get; } bool HasTargets(); List<Transform> GetAllTargets(); Transform GetNearestTarget(); void ForceRecalculate(); }

internal class FieldOfView : MonoBehaviour, IFOV { [Header("Field of View Parameters")] [SerializeField] private float _viewRadius = 3f; [SerializeField] [Range(0,360)] private float _viewAngle = 90f; [SerializeField] private float _distanceToLostTarget = 2f; [SerializeField] private double _updateTimer = 0.2; [Header("Layer Mask")] [SerializeField] private LayerMask _targetMask; [SerializeField] private LayerMask _obstructionMask; // Targets Data private bool _hasTargets = false; private bool _isLostTargets = false; private Transform _currentTarget = null; private List<Transform> _targetsList = new List<Transform>(); private IDisposable _searchTargets; public GameEvent<Transform> OnMainTargetChanged = new GameEvent<Transform>(); public GameEvent OnTargetsFound = new GameEvent(); public GameEvent OnTargetsLost = new GameEvent(); // Public Fields public float Radius => _viewRadius; public float Angle => _viewAngle; public Transform CurrentTargetTransform => _currentTarget; private void Start() { _searchTargets = Observable.Interval(TimeSpan.FromSeconds(_updateTimer)).Subscribe(l => { FieldOfViewCheck(); }); } private void FieldOfViewCheck() { // Check Current FOV if (!_hasTargets || _currentTarget==null) { _targetsList.Clear(); Collider[] rangeChecks = Physics.OverlapSphere(transform.position, _viewRadius, _targetMask); if (rangeChecks.Length > 0) { for (int i = 0; i < rangeChecks.Length; i++) { bool isSeeTarget = false; Transform target = rangeChecks[i].transform; Vector3 directionToTarget = (target.position - transform.position).normalized; if (Vector3.Angle(transform.forward, directionToTarget) < _viewAngle / 2) { float distanceToTarget = Vector3.Distance(transform.position, target.position); if (!Physics.Raycast(transform.position, directionToTarget, distanceToTarget, _obstructionMask)) { isSeeTarget = true; } else isSeeTarget = false; } else isSeeTarget = false; if (isSeeTarget) { _targetsList.Add(target); } } } } // Get Nearest Target if (!_hasTargets && _targetsList.Count > 0) { Transform nearestTarget = GetNearestTarget(); if (_currentTarget != nearestTarget && nearestTarget!=null) { _hasTargets = true; _currentTarget = nearestTarget; OnMainTargetChanged?.Invoke(_currentTarget); OnTargetsFound?.Invoke(); } } // Check Distance to Current Targets if (_hasTargets) { float distanceToTarget = Vector3.Distance(_currentTarget.position, transform.position); if (distanceToTarget > _distanceToLostTarget) { _hasTargets = false; _currentTarget = null; return; } _isLostTargets = false; } if (!_hasTargets && _targetsList.Count < 1) { if (!_isLostTargets) { _isLostTargets = true; OnTargetsLost?.Invoke(); } } } public List<Transform> GetAllTargets() { return _targetsList; } public Transform GetNearestTarget() { Transform nearestTarget = null; float nearestDistance = 0f; if (_targetsList.Count < 1) return null; for (int i = 0; i < _targetsList.Count; i++) { float currentDistance = Vector3.Distance(transform.position, _targetsList[i].position); if (i == 0) { nearestTarget = _targetsList[i]; nearestDistance = currentDistance; continue; } if (currentDistance < nearestDistance) { nearestTarget = _targetsList[i]; nearestDistance = currentDistance; } } return nearestTarget; } public bool HasTargets() { return _hasTargets; } public void ForceRecalculate() { FieldOfViewCheck(); } }