（102）A* Pathfinding Project Pro（Aron Granberg）：控制物体移动时，角色行走在不可行走区域的bug

1. 如图，通过OnPathDelegate回调获得Path，然后在 update 里面，通过调用 SeekFunc，角色行走在不可行走区域（绿色区域），直接穿过去了，没有沿可行走路径移动：
   

2. 问题代码：

   public void SeekFunc()
   {	
   	if (path==null)
   	{
   		stateMachine.SwitchState((int)PlayerStateEnum.Idle);
   		Debug.Log($"path=========null, state={stateMachine.PlayerController.PlayerStateEnum}", stateMachine.PlayerController.gameObject);
   		return;
   	}
   
   	try
   	{
   		...		
   		Vector3 currentPos = stateMachine.PlayerController.transform.position;
   		Vector3 targetWaypoint = path.vectorPath[currentPoint];
   
   		// 计算剩余路径距离
   		float remainingDistance = 0;
   		for (int i = currentPoint; i < path.vectorPath.Count - 1; i++)
   		{
   			remainingDistance += Vector3.Distance(path.vectorPath[i], path.vectorPath[i + 1]);
   		}
   		remainingDistance += Vector3.Distance(currentPos, targetWaypoint);
   
   		// 计算移动方向和距离
   		Vector3 moveDir = (targetWaypoint - currentPos).normalized;
   		float playerSpeed = stateMachine.PlayerController.MoveSpeed;
   		Vector3 rvoTarget = currentPos + moveDir * remainingDistance;
   		
   		// for (int i = currentPoint; i < path.vectorPath.Count - 2; i++)
   		// {
   		//     Debug.DrawLine(path.vectorPath[i], path.vectorPath[i + 1],Color.red);
   		// }
   		
   		// 设置RVO目标
   		rvoController.SetTarget(rvoTarget, playerSpeed, playerSpeed);
   
   		// 应用RVO计算的移动
   		Vector3 movementDelta = rvoController.CalculateMovementDelta(Time.deltaTime);
   		stateMachine.PlayerController.transform.position += movementDelta;
   
   		// 更新朝向
   		if (movementDelta.magnitude > 0.01f)
   		{
   			var scale = stateMachine.PlayerController.Root.localScale;
   			
   			// 计算当前移动方向在等轴视角下的"水平"分量
   			float adjustedX = movementDelta.x - movementDelta.z;
   			
   			// 保存当前朝向状态（1为右，-1为左）
   			int currentDirection = scale.x > 0 ? 1 : -1;
   			
   			// 只有当变化足够明显时才改变方向
   			float threshold = 0.03f; // 调整阈值大小控制朝向切换灵敏度
   			
   			// 若当前方向与移动方向不一致，且差异显著，才切换方向
   			if ((currentDirection > 0 && adjustedX < -threshold) || 
   				(currentDirection < 0 && adjustedX > threshold))
   			{
   				// 方向明显不同，切换朝向
   				scale.x = Mathf.Abs(scale.x) * (adjustedX > 0 ? 1 : -1);
   				stateMachine.PlayerController.Root.localScale = scale;
   			}
   		}
   
   		// 检查是否到达当前路径点
   		float moveNextDist = 1f;
   		if (Vector3.Distance(currentPos, targetWaypoint) < moveNextDist)
   		{
   			currentPoint++;
   		}
   	}
   	catch (Exception e)
   	{
   		// Debug.LogError(e);
   		stateMachine.SwitchState((int)PlayerStateEnum.Idle);
   	}
   }
   

3. 解决，将 moveNextDist 改小为 0.1。

float moveNextDist = 0.1f;
if (Vector3.Distance(currentPos, targetWaypoint) < moveNextDist)
{
currentPoint++;
}