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Assets/Scripts/ExitMap/LinerMgr.cs

@@ -9,6 +9,9 @@ public class LinerMgr : MonoSingleton<LinerMgr>
     public float height = 0.5f;
     public float arrowLength = 0.5f;
     public float speed = 1f;
+    public float groundHeight = 0.25f; // 地面导航时的高度
+    public float startDistance = 2f; // 箭头起始距离（相机前方）
+    public float backStartDistance = 5f; // 目标在后方时，箭头起始距离（更远）
 
     public GameObject arrowPrefab;
     private Vector3 target;
@@ -50,9 +53,58 @@ public class LinerMgr : MonoSingleton<LinerMgr>
 
     void UpdateArrow()
     {
-        float distance = Vector3.Distance(transform.position, target);
-        float radius = height / 2f + distance * distance / (8f * height);
-        float diff = radius - height;
+        Vector3 actualTarget = target;
+        
+        // 统一使用地面导航模式
+        Camera mainCamera = Camera.main;
+        if (mainCamera == null)
+        {
+            mainCamera = FindObjectOfType<Camera>();
+        }
+        
+        if (mainCamera != null && m_target != null)
+        {
+            actualTarget = m_target.position;
+            
+            // 计算目标相对于相机的方向
+            Vector3 cameraPos = mainCamera.transform.position;
+            Vector3 cameraForward = mainCamera.transform.forward;
+            Vector3 toTarget = actualTarget - cameraPos;
+            float distanceToTarget = toTarget.magnitude;
+            Vector3 toTargetDir = toTarget.normalized;
+            
+            // 判断目标是否在相机后方（点积小于0表示在后方）
+            float dotProduct = Vector3.Dot(cameraForward, toTargetDir);
+            bool isBehind = dotProduct < 0f;
+            
+            // 计算箭头起始位置 - 始终在相机前方，这样玩家才能看到
+            Vector3 startPos;
+            if (isBehind)
+            {
+                // 目标在后方：箭头起始点在相机前方，但箭头会向后指
+                // 使用更远的距离，让箭头更明显
+                startPos = cameraPos + cameraForward * backStartDistance;
+            }
+            else
+            {
+                // 目标在前方或侧面：从相机前方开始，稍微偏向目标方向
+                Vector3 startDir = Vector3.Slerp(cameraForward, toTargetDir, 0.3f).normalized;
+                startPos = cameraPos + startDir * startDistance;
+            }
+            
+            // 设置高度为接近地面的高度（目标高度 + 地面高度偏移）
+            startPos.y = actualTarget.y + groundHeight;
+            transform.position = startPos;
+        }
+        else if (m_target != null)
+        {
+            // 没有相机，使用目标位置
+            actualTarget = m_target.position;
+        }
+        
+        float distance = Vector3.Distance(transform.position, actualTarget);
+        float radius = groundHeight / 2f + distance * distance / (8f * groundHeight);
+        float diff = radius - groundHeight;
         float angle = 2f * Mathf.Acos(diff / radius);
         float length = angle * radius;
         float segmentAngle = arrowLength / radius * Mathf.Rad2Deg;
@@ -75,9 +127,13 @@ public class LinerMgr : MonoSingleton<LinerMgr>
             arrowList[i].localRotation = Quaternion.FromToRotation(Vector3.up, pos - center);
 
         }
-        transform.LookAt(m_target);
+        
+        if (m_target != null)
+        {
+            transform.LookAt(actualTarget);
+        }
     }
-
+    
     void ArrowInit(int listCount)
     {
         while (arrowList.Count < listCount)