Unity 基于navMesh的怪物追踪惯性系统

今天做项目适合 策划想要实现一个在现有的怪物追踪系统上实现怪物拥有惯性功能

以下是解决方案分享：

怪物基类代码：

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using UnityEngine;
using UnityEngine.AI;[RequireComponent(typeof(NavMeshAgent))]
[RequireComponent(typeof(AudioSource))]
public abstract class MonsterBase : MonoBehaviour
{public enum MonsterState { Idle, Patrol, Chase }//1.待机，2.巡逻，3.追击[Header("巡逻时的速度")]public float patrolSpeed = 2f;[Header("追击玩家时的速度")]public float chaseSpeed = 5f;[Header("怪物的加速度")]public float acceleration = 50f; // 大加速度[Header("怪物的旋转速度")]public float angularSpeed = 120f;[Header("怪物与目标的停止距离")]public float stoppingDistance = 0.1f;[Header("怪屋听觉能检测到玩家的范围")]public float detectionRange = 10f;[Space(30)][Header("视觉检测设置")][Tooltip("扇形检测半径")]public float visionRange = 5f;[Tooltip("扇形检测角度(度)")][Range(0, 360)]public float visionAngle = 90f;[Tooltip("检测层级(应包含玩家和障碍物)")]public LayerMask visionMask;[Header("声音设置")]public AudioClip howlSound;[Header("最大音量")]public float maxHowlVolume = 1f;[Header("开始嚎叫距离阈值")]public float howlDistance = 5f;protected NavMeshAgent agent;protected AudioSource audioSource;//怪物声音protected Transform player;protected MonsterState currentState = MonsterState.Patrol;protected Animator animator;protected SpriteRenderer spriteRenderer;//精灵组件private Vector2 lastPosition;//上一帧位置private Direction currentDirection = Direction.Down;//当前移动方向protected enum Direction { Up, Down, Left, Right }void Awake(){agent = GetComponent<NavMeshAgent>();audioSource = GetComponent<AudioSource>();animator = GetComponent<Animator>();spriteRenderer = GetComponentInChildren<SpriteRenderer>();player = GameObject.FindGameObjectWithTag("Player").transform;ConfigureAgent();}void ConfigureAgent(){agent.acceleration = acceleration;agent.angularSpeed = angularSpeed;agent.stoppingDistance = stoppingDistance;agent.updateRotation = false; // 禁用自动旋转，我们自己控制agent.updateUpAxis = false; // 保持2D平面}void Update(){UpdateState();UpdateAnimation();UpdateHowlSound();}/// <summary>/// 抽象状态机 /// </summary>protected abstract void UpdateState();public virtual void  UpdateAnimation(){// 计算移动方向Vector2 movement = (Vector2)transform.position - lastPosition;lastPosition = transform.position;if (movement.magnitude > 0.01f) // 正在移动{if (Mathf.Abs(movement.x) > Mathf.Abs(movement.y)){currentDirection = movement.x > 0 ? Direction.Right : Direction.Left;}else{currentDirection = movement.y > 0 ? Direction.Up : Direction.Down;}//TODO：考虑设计CONST表// animator.SetBool("IsMoving", true);// animator.SetInteger("Direction", (int)currentDirection);}else // 待机{// animator.SetBool("IsMoving", false);}// 更新Sprite朝向if (currentDirection == Direction.Left){spriteRenderer.flipX = true;}else if (currentDirection == Direction.Right){spriteRenderer.flipX = false;}}/// <summary>/// 获取当前移动方向(归一化向量)/// </summary>protected Vector3 GetMovementDirection(){if (agent != null && agent.velocity.magnitude > 0.1f){return agent.velocity.normalized;}return transform.forward; // 默认使用面朝方向}protected bool CanSeePlayer(){if (player == null) return false;Vector3 directionToPlayer = player.position - transform.position;float distanceToPlayer = directionToPlayer.magnitude;// 距离检查if (distanceToPlayer > visionRange)return false;// 获取当前移动方向Vector3 moveDirection = GetMovementDirection();// 角度检查(基于移动方向)float angleToPlayer = Vector3.Angle(moveDirection, directionToPlayer);if (angleToPlayer > visionAngle / 2f)return false;// 视线遮挡检查RaycastHit hit;if (Physics.Raycast(transform.position, directionToPlayer.normalized, out hit, visionRange, visionMask)){return hit.collider.CompareTag("Player");}return false;}/// <summary>/// 在Scene视图中绘制视觉范围(调试用)/// </summary>/// <summary>/// 绘制基于移动方向的扇形检测范围/// </summary>private void OnDrawGizmos(){// 获取当前移动方向(编辑器中使用面朝方向，运行时用实际移动方向)Vector3 moveDir = Application.isPlaying ? GetMovementDirection() : transform.forward;// 设置扇形颜色Gizmos.color = new Color(1, 0.5f, 0, 0.3f); // 半透明橙色// 计算扇形边缘Vector3 center = transform.position;Vector3 forward = moveDir * visionRange;Vector3 left = Quaternion.Euler(0, -visionAngle / 2, 0) * forward;Vector3 right = Quaternion.Euler(0, visionAngle / 2, 0) * forward;// 绘制扇形边缘线Gizmos.DrawLine(center, center + left);Gizmos.DrawLine(center, center + right);// 绘制扇形弧线Vector3 lastPoint = center + left;int segments = 20;for (int i = 1; i <= segments; i++){float t = (float)i / segments;float angle = Mathf.Lerp(-visionAngle / 2, visionAngle / 2, t);Vector3 nextPoint = center + Quaternion.Euler(0, angle, 0) * forward;Gizmos.DrawLine(lastPoint, nextPoint);lastPoint = nextPoint;}// 绘制移动方向指示器Gizmos.color = Color.red;Gizmos.DrawLine(center, center + moveDir * 1.5f);}void UpdateHowlSound(){if (howlSound == null) return;float distanceToPlayer = Vector3.Distance(transform.position, player.position);if (distanceToPlayer <= howlDistance){if (!audioSource.isPlaying){audioSource.clip = howlSound;audioSource.Play();}// 距离越近声音越大float volume = Mathf.Lerp(0.1f, maxHowlVolume, 1 - (distanceToPlayer / howlDistance));audioSource.volume = volume;}else if (audioSource.isPlaying){audioSource.Stop();}}protected void ChangeState(MonsterState newState){if (currentState == newState) return;currentState = newState;switch (currentState){case MonsterState.Idle:agent.isStopped = true;break;case MonsterState.Patrol:agent.speed = patrolSpeed;agent.isStopped = false;break;case MonsterState.Chase:agent.speed = chaseSpeed;agent.isStopped = false;break;}}void OnCollisionEnter(Collision collision){if (collision.gameObject.CompareTag("Player")){Debug.Log("触碰到玩家");//TODO：玩家死亡//collision.gameObject.GetComponent<PlayerController>().Die();}}​

带有惯性的怪物实现：

using UnityEngine;
using UnityEngine.AI;[RequireComponent(typeof(NavMeshAgent))]
[RequireComponent(typeof(Rigidbody))]
public class Angry : MonsterBase
{[Header("数据配置表")]public MonsterConfig config;[Header("巡逻点数组")]public Transform[] patrolPoints;[Header("每个巡逻点的停留时间")]public float waitTimeAtPoint = 2f;[Header("探测范围(圆)")] public float AngrydetectionRange = 2f;[Header("移动惯性超出系数")]public float overshootFactor = 1.8f;[Header("急撒系数")]public float brakeForce = 4f;[Header("最小启动惯性移动阈值速度")]public float overshootMinSpeed = 0.5f;[Header("触发惯性移动距离倍速")]public float overshootTriggerDistance = 1.5f; // 私有变量private int currentPatrolIndex = 0;private float waitTimer = 0f;private bool isWaiting = false;private bool isPlayerMove = false;// 惯性相关private Vector3 lastVelocity;private bool isOvershooting = false;private Rigidbody rb;private Vector3 overshootStartPosition;public void Start(){// 获取组件rb = GetComponent<Rigidbody>();agent = GetComponent<NavMeshAgent>();player = GameObject.FindGameObjectWithTag("Player").transform;// 初始化配置detectionRange = config.detectionRange;stoppingDistance = config.stoppingDistance;acceleration = config.acceleration;angularSpeed = config.angularSpeed;howlDistance = config.howlDistance;chaseSpeed = config.chaseSpeed;patrolSpeed = config.patrolSpeed;maxHowlVolume = config.maxHowlVolume;howlSound = config.howlSound;// 代理设置agent.autoBraking = false;agent.updatePosition = false;agent.updateRotation = false;// 刚体设置rb.isKinematic = false;rb.interpolation = RigidbodyInterpolation.Interpolate;rb.collisionDetectionMode = CollisionDetectionMode.Continuous;rb.constraints = RigidbodyConstraints.FreezeRotation | RigidbodyConstraints.FreezePositionY;// 初始巡逻目标if (patrolPoints.Length > 0){SetPatrolDestination();}isPlayerMove = player.GetComponent<Movement>().IsPlayerMoving();}private void Update(){UpdateState();// 记录速度用于惯性（仅当代理活跃时）if (agent.velocity.magnitude > 0.1f && !isOvershooting && agent.isActiveAndEnabled){lastVelocity = agent.velocity;}}private void FixedUpdate(){if (isOvershooting){HandleOvershoot();}else if (agent.isOnNavMesh){// 同步NavMeshAgent和Rigidbody位置agent.nextPosition = rb.position;rb.velocity = agent.velocity;}}protected override void UpdateState(){float distanceToPlayer = Vector3.Distance(transform.position, player.position);bool canSeePlayer = CanSeePlayer();// 只在非惯性状态下处理状态转换if (!isOvershooting){if (canSeePlayer){ChangeState(MonsterState.Chase);ChasePlayer();}else if (distanceToPlayer <= AngrydetectionRange && isPlayerMove){ChangeState(MonsterState.Chase);ChasePlayer();}else if (currentState == MonsterState.Chase){ChangeState(MonsterState.Patrol);// 返回巡逻时立即设置目标if (patrolPoints.Length > 0) SetPatrolDestination();}if (currentState == MonsterState.Patrol){Patrol();}}}void ChasePlayer(){if (isOvershooting) return;agent.speed = chaseSpeed;agent.SetDestination(player.position);// 接近玩家时触发惯性float distanceToPlayer = Vector3.Distance(transform.position, player.position);if (distanceToPlayer < agent.stoppingDistance * overshootTriggerDistance){StartOvershoot();}}void Patrol(){if (patrolPoints.Length == 0){ChangeState(MonsterState.Idle);return;}if (isWaiting){waitTimer += Time.deltaTime;if (waitTimer >= waitTimeAtPoint){isWaiting = false;waitTimer = 0f;currentPatrolIndex = (currentPatrolIndex + 1) % patrolPoints.Length;SetPatrolDestination();}return;}// 使用路径状态和距离判断if (!agent.pathPending && agent.remainingDistance <= agent.stoppingDistance + 0.2f){isWaiting = true;}// 添加目标丢失的重新设置逻辑else if (!agent.hasPath || agent.pathStatus != NavMeshPathStatus.PathComplete){SetPatrolDestination();}}void SetPatrolDestination(){if (isOvershooting || patrolPoints.Length == 0 || currentPatrolIndex >= patrolPoints.Length) return;agent.speed = patrolSpeed;NavMeshHit hit;if (NavMesh.SamplePosition(patrolPoints[currentPatrolIndex].position, out hit, 2.0f, NavMesh.AllAreas)){agent.SetDestination(hit.position);agent.isStopped = false;}else{Debug.LogWarning($"无法导航到巡逻点: {patrolPoints[currentPatrolIndex].name}");// 自动跳到下一个点currentPatrolIndex = (currentPatrolIndex + 1) % patrolPoints.Length;SetPatrolDestination();}}void StartOvershoot(){isOvershooting = true;overshootStartPosition = transform.position;agent.isStopped = true;// 计算惯性速度（保留原有方向但增加速度）lastVelocity = lastVelocity.normalized * agent.speed * overshootFactor;rb.velocity = lastVelocity;}void HandleOvershoot(){// 应用减速lastVelocity = Vector3.Lerp(lastVelocity, Vector3.zero, brakeForce * Time.fixedDeltaTime);rb.velocity = lastVelocity;// 检查是否该停止惯性if (lastVelocity.magnitude < overshootMinSpeed || Vector3.Distance(overshootStartPosition, transform.position) > chaseSpeed * 3f){EndOvershoot();}}void EndOvershoot(){isOvershooting = false;rb.velocity = Vector3.zero;if (agent.isOnNavMesh){agent.Warp(transform.position);agent.isStopped = false;// 根据当前状态恢复行为if (currentState == MonsterState.Patrol){SetPatrolDestination();}else if (currentState == MonsterState.Chase && Vector3.Distance(transform.position, player.position) <= AngrydetectionRange){ChasePlayer();}}}void OnCollisionEnter(Collision collision){if (isOvershooting){// 撞墙反弹效果if (collision.gameObject.CompareTag("Wall")){lastVelocity = Vector3.Reflect(lastVelocity, collision.contacts[0].normal) * 0.7f;rb.velocity = lastVelocity;}// 撞到玩家if (collision.gameObject.CompareTag("Player")){//TODO：//collision.gameObject.GetComponent<PlayerHealth>().TakeDamage(1);EndOvershoot();}}}public override void UpdateAnimation(){Vector3 moveDirection = isOvershooting ? rb.velocity : agent.velocity;//TODO:添加Animation后更新启用// if (moveDirection.magnitude > 0.1f)// {//     animator.SetBool("IsMoving", true);//     //     // 确定方向（2.5D游戏通常只需要4方向）//     if (Mathf.Abs(moveDirection.x) > Mathf.Abs(moveDirection.z))//     {//         animator.SetInteger("Direction", moveDirection.x > 0 ? 2 : 3); // Right/Left//     }//     else//     {//         animator.SetInteger("Direction", moveDirection.z > 0 ? 0 : 1); // Up/Down//     }//     //     // 设置动画速度（惯性时更快）//     animator.SetFloat("MoveSpeed", moveDirection.magnitude / (isOvershooting ? chaseSpeed * 1.5f : chaseSpeed));// }// else// {//     animator.SetBool("IsMoving", false);// }//// // 更新惯性状态// animator.SetBool("IsOvershooting", isOvershooting);}void OnDrawGizmosSelected(){// 绘制巡逻路径if (patrolPoints != null && patrolPoints.Length > 0){Gizmos.color = Color.yellow;for (int i = 0; i < patrolPoints.Length; i++){if (patrolPoints[i] != null){Gizmos.DrawSphere(patrolPoints[i].position, 0.3f);if (i < patrolPoints.Length - 1 && patrolPoints[i+1] != null){Gizmos.DrawLine(patrolPoints[i].position, patrolPoints[i+1].position);}}}}// 绘制当前目标if (currentState == MonsterState.Patrol && patrolPoints != null && currentPatrolIndex < patrolPoints.Length){Gizmos.color = Color.red;Gizmos.DrawLine(transform.position, patrolPoints[currentPatrolIndex].position);}}

ok分享结束！