193 lines
8.4 KiB
C#
193 lines
8.4 KiB
C#
/// ---------------------------------------------
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/// Movement Pack for Behavior Designer Pro
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/// Copyright (c) Opsive. All Rights Reserved.
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/// https://www.opsive.com
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/// ---------------------------------------------
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using Opsive.BehaviorDesigner.AddOns.Shared.Runtime.Pathfinding;
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namespace Opsive.BehaviorDesigner.AddOns.MovementPack.Runtime.Tasks
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{
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using Opsive.BehaviorDesigner.Runtime.Tasks;
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using Opsive.GraphDesigner.Runtime;
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using Opsive.GraphDesigner.Runtime.Variables;
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using UnityEngine;
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[Opsive.Shared.Utility.Description("Pursues the specified target with precise stopping. Manually controls agent speed based on distance to stop smoothly without overshooting.")]
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[NodeIcon("079b135d5d495e14abd9ad2cb0dfaf9e", "c0515b66e6314734ba5a8f2ec7d6f451")]
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public class PrecisePursue : MovementBase // 依然继承自 MovementBase
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{
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// --- 原有的 Pursue 变量 ---
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[Tooltip("The GameObject that the agent is seeking.")]
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[SerializeField] protected SharedVariable<GameObject> m_Target;
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[Tooltip("Specifies how far to predict the distance ahead of the target. Lower values indicate that less distance should be predicated.")]
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[SerializeField] protected SharedVariable<float> m_DistancePrediction = 20;
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[Tooltip("Specifies the multiplier for predicting the look ahead distance.")]
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[SerializeField] protected SharedVariable<float> m_DistancePredictionMultiplier = 20;
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// --- 新增的“方案一”变量 ---
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[Header("Precise Stopping")]
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[Tooltip("【新】开始减速的距离 (例如 6m)")]
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[SerializeField] protected SharedVariable<float> m_SlowDownDistance = 6f;
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[Tooltip("【新】减速到最慢时的速度 (防止完全停止)")]
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[SerializeField] protected SharedVariable<float> m_MinSpeed = 0.5f;
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// --- 私有变量 ---
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private Vector3 m_TargetPosition;
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private float m_OriginalMaxSpeed; // 用于存储 Agent 的原始最大速度
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private NavMeshAgentPathfinder m_Pathfinder => base.m_Pathfinder as NavMeshAgentPathfinder;
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/// <summary>
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/// The task has started.
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/// </summary>
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public override void OnStart()
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{
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base.OnStart();
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if (m_Target == null) {
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Debug.LogError("Error: A target must be set on the PrecisePursue ability.");
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return;
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}
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// --- 关键设置 ---
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// 1. 存储原始最大速度
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m_OriginalMaxSpeed = m_Pathfinder.Speed;
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// 2. 关闭 NavMeshAgent 的自动刹车，因为我们要手动控制
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m_Pathfinder.m_NavMeshAgent.autoBraking = false;
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// ---------------
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m_TargetPosition = m_Target.Value.transform.position;
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SetDestination(GetTargetDestination());
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}
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/// <summary>
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/// (原 Pursue 脚本逻辑，保持不变)
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/// Returns the target destination.
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/// </summary>
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/// <returns>The target destination.</returns>
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private Vector3 GetTargetDestination()
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{
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// Calculate the current distance to the target and the current speed.
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var distance = (m_Target.Value.transform.position - transform.position).magnitude;
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var velocityMagnitude = m_Pathfinder.Velocity.magnitude;
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var futurePrediction = 0f;
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// Set the future prediction to the max prediction if the speed is too small to give an accurate prediction.
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if (velocityMagnitude <= distance / m_DistancePrediction.Value) {
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futurePrediction = m_DistancePrediction.Value;
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} else {
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futurePrediction = (distance / velocityMagnitude) * m_DistancePredictionMultiplier.Value;
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}
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// Predict the future by taking the velocity of the target and multiply it by the future prediction.
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var lastTargetPosition = m_TargetPosition;
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m_TargetPosition = m_Target.Value.transform.position;
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return m_TargetPosition + (m_TargetPosition - lastTargetPosition) * futurePrediction;
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}
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/// <summary>
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/// Updates the destination.
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/// </summary>
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/// <returns>Success when the agent arrives.</returns>
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public override TaskStatus OnUpdate()
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{
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if (m_Target == null || m_Target.Value == null) {
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return TaskStatus.Failure;
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}
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// --- 核心修改：基于距离的速度控制 ---
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// 1. 计算【直线距离】(非常重要，不用 NavMesh 的 remainingDistance)
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float distanceToTarget = Vector3.Distance(transform.position, m_Target.Value.transform.position);
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// 2. 检查是否已“到达” (即进入了停止范围)
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if (distanceToTarget <= m_Pathfinder.StoppingDistance)
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{
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// 已经到达，强制停止并返回成功
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m_Pathfinder.m_NavMeshAgent.velocity = Vector3.zero; // 清除惯性
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m_Pathfinder.m_NavMeshAgent.isStopped = true;
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m_Pathfinder.m_NavMeshAgent.speed = 0f; // 速度设为零
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return TaskStatus.Success;
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}
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// 3. 检查是否在“减速缓冲区”
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if (distanceToTarget < m_SlowDownDistance.Value)
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{
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// 在缓冲区 (例如 2m 到 6m 之间)
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// 计算减速因子 (0.0 -> 1.0)
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// 距离 = 2m 时, factor = 0.0
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// 距离 = 6m 时, factor = 1.0
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float factor = (distanceToTarget - m_Pathfinder.StoppingDistance) / (m_SlowDownDistance.Value - m_Pathfinder.StoppingDistance);
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// 使用 Lerp 平滑地插值速度
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m_Pathfinder.m_NavMeshAgent.speed = Mathf.Lerp(m_MinSpeed.Value, m_OriginalMaxSpeed, factor);
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m_Pathfinder.m_NavMeshAgent.isStopped = false;
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}
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else
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{
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// 在缓冲区外，全速前进
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m_Pathfinder.m_NavMeshAgent.speed = m_OriginalMaxSpeed;
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m_Pathfinder.m_NavMeshAgent.isStopped = false;
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}
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// --- 核心修改结束 ---
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// 4. (原 Pursue 逻辑) 持续更新目标点（因为目标在移动）
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SetDestination(GetTargetDestination());
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return TaskStatus.Running;
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}
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/// <summary>
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/// Resets the task values back to their default.
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/// </summary>
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public override void Reset()
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{
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base.Reset();
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// 原有变量
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m_Target = null;
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m_DistancePrediction = 20;
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m_DistancePredictionMultiplier = 20;
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// 新增变量
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m_SlowDownDistance = 6f;
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m_MinSpeed = 0.5f;
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}
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/// <summary>
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/// 任务结束时（无论是成功到达，还是被Parallel Selector打断），彻底重置状态
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/// </summary>
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public override void OnEnd()
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{
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base.OnEnd();
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if (m_Pathfinder != null && m_Pathfinder.m_NavMeshAgent != null)
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{
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// 1. 【核心修复】立即物理刹车
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// 只有在 Agent 处于激活且在 NavMesh 上时才操作，防止报错
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if (m_Pathfinder.m_NavMeshAgent.isOnNavMesh && m_Pathfinder.m_NavMeshAgent.isActiveAndEnabled)
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{
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// 强制停止寻路逻辑
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m_Pathfinder.m_NavMeshAgent.isStopped = true;
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// 抹除物理惯性 (这是导致滑步的罪魁祸首)
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m_Pathfinder.m_NavMeshAgent.velocity = Vector3.zero;
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// 清空当前的路径数据 (防止下一个任务开始前，Agent试图跑完旧路径)
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m_Pathfinder.m_NavMeshAgent.ResetPath();
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}
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// 2. 恢复参数设置 (把 Agent 还原成标准状态，供下一个 Task 使用)
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m_Pathfinder.m_NavMeshAgent.autoBraking = true;
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m_Pathfinder.m_NavMeshAgent.speed = m_OriginalMaxSpeed;
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// 注意：不要在这里设为 isStopped = false。
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// 下一个 Task (比如 Attack 或 Move) 开始时，
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// 它们会自动调用 SetDestination 或相关逻辑来启动 Agent。
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// 在这里保持 Stopped 是最安全的“待机”状态。
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}
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}
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}
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} |