修改线的渲染长度不一致问题

Assets/Scripts/Fishing/Rope/Rope.cs

@@ -31,6 +31,12 @@ public class Rope : MonoBehaviour
     [SerializeField, Range(0, 16), Tooltip("主求解后追加的硬长度约束次数。只负责把 poly 拉回到 rest total，不改变可变长度逻辑")]
     private int hardTightenIterations = 2;
 
+    [SerializeField, Range(0, 32), Tooltip("当绳子接近拉直时，按误差自动追加的硬长度约束次数上限")]
+    private int adaptiveHardTightenMaxIterations = 8;
+
+    [SerializeField, Min(0f), Tooltip("单段允许的最大超长误差；超过时继续追加硬长度约束")]
+    private float hardConstraintTolerance = 0.0005f;
+
     [Header("Length Control (No Min/Max Clamp)")]
     [Tooltip("初始总长度（米）。如果为 0，则用 physicsSegmentLen*(minPhysicsNodes-1) 作为初始长度")]
     [SerializeField, Min(0f)]
@@ -211,6 +217,8 @@ public class Rope : MonoBehaviour
         renderSubdivisionsMoving = Mathf.Max(renderSubdivisionsMoving, 1);
         iterations = Mathf.Clamp(iterations, 1, 80);
         hardTightenIterations = Mathf.Clamp(hardTightenIterations, 0, 16);
+        adaptiveHardTightenMaxIterations = Mathf.Clamp(adaptiveHardTightenMaxIterations, 0, 32);
+        hardConstraintTolerance = Mathf.Max(0f, hardConstraintTolerance);
         groundCastDistance = Mathf.Max(groundCastDistance, 0.01f);
         groundCastHeight = Mathf.Max(groundCastHeight, 0f);
         lineWidth = Mathf.Max(lineWidth, 0.0001f);
@@ -532,6 +540,7 @@ public class Rope : MonoBehaviour
         }
 
         SolveHardDistanceConstraints(hardTightenIterations);
+        SolveHardDistanceConstraintsAdaptive();
         LockAnchorsHard();
 
         if (constrainToGround)
@@ -572,16 +581,7 @@ public class Rope : MonoBehaviour
         EnsureRenderCaches();
 
         int last = _physicsNodes - 1;
-
-        Vector3 s = _startTr.position;
-        Vector3 e = _endTr.position;
-
-        _pCurr[0] = s;
-        _pCurr[last] = e;
-        // _pPrev[0] = s;
-        // _pPrev[last] = e;
-
-        DrawHighResLine_Fast();
+        DrawHighResLine_Fast(_startTr.position, _endTr.position, last);
     }
 
     private void UpdateLengthSmooth()
@@ -734,6 +734,21 @@ public class Rope : MonoBehaviour
         }
     }
 
+    private void SolveHardDistanceConstraintsAdaptive()
+    {
+        if (adaptiveHardTightenMaxIterations <= 0 || hardConstraintTolerance <= 0f)
+            return;
+
+        for (int it = 0; it < adaptiveHardTightenMaxIterations; it++)
+        {
+            if (GetMaxPositiveSegmentDelta() <= hardConstraintTolerance)
+                break;
+
+            LockAnchorsHard();
+            SolveDistanceConstraints_HeadOnly_Hard();
+        }
+    }
+
     private void SolveDistanceConstraints_HeadOnly_Hard()
     {
         SolveDistanceConstraints_HeadOnly_Bidirectional(1f);
@@ -787,6 +802,21 @@ public class Rope : MonoBehaviour
         }
     }
 
+    private float GetMaxPositiveSegmentDelta()
+    {
+        float maxDelta = 0f;
+        for (int i = 1; i < _physicsNodes; i++)
+        {
+            float rest = (i == 1) ? _headRestLen : physicsSegmentLen;
+            float segLen = Vector3.Distance(_pCurr[i - 1], _pCurr[i]);
+            float delta = segLen - rest;
+            if (delta > maxDelta)
+                maxDelta = delta;
+        }
+
+        return maxDelta;
+    }
+
     private void ConstrainToGround()
     {
         if (groundMask == 0) return;
@@ -938,7 +968,7 @@ public class Rope : MonoBehaviour
         }
     }
 
-    private void DrawHighResLine_Fast()
+    private void DrawHighResLine_Fast(Vector3 renderStart, Vector3 renderEnd, int last)
     {
         if (_pCurr == null || _physicsNodes < 2) return;
 
@@ -949,7 +979,9 @@ public class Rope : MonoBehaviour
         if (!smooth)
         {
             _lineRenderer.positionCount = _physicsNodes;
-            _lineRenderer.SetPositions(_pCurr);
+            for (int i = 0; i <= last; i++)
+                _rPoints[i] = GetRenderPoint(i, last, renderStart, renderEnd);
+            _lineRenderer.SetPositions(_rPoints);
             return;
         }
 
@@ -964,7 +996,6 @@ public class Rope : MonoBehaviour
         }
 
         int idx = 0;
-        int last = _physicsNodes - 1;
 
         for (int seg = 0; seg < last; seg++)
         {
@@ -975,10 +1006,10 @@ public class Rope : MonoBehaviour
             int i3 = seg + 2;
             if (i3 > last) i3 = last;
 
-            Vector3 p0 = _pCurr[i0];
-            Vector3 p1 = _pCurr[i1];
-            Vector3 p2 = _pCurr[i2];
-            Vector3 p3 = _pCurr[i3];
+            Vector3 p0 = GetRenderPoint(i0, last, renderStart, renderEnd);
+            Vector3 p1 = GetRenderPoint(i1, last, renderStart, renderEnd);
+            Vector3 p2 = GetRenderPoint(i2, last, renderStart, renderEnd);
+            Vector3 p3 = GetRenderPoint(i3, last, renderStart, renderEnd);
 
             for (int s = 0; s < subdiv; s++)
             {
@@ -1001,12 +1032,21 @@ public class Rope : MonoBehaviour
             }
         }
 
-        _rPoints[idx++] = _pCurr[last];
+        _rPoints[idx++] = renderEnd;
 
         _lineRenderer.positionCount = idx;
         _lineRenderer.SetPositions(_rPoints);
     }
 
+    private Vector3 GetRenderPoint(int index, int last, Vector3 renderStart, Vector3 renderEnd)
+    {
+        if (index <= 0)
+            return renderStart;
+        if (index >= last)
+            return renderEnd;
+        return _pCurr[index];
+    }
+
     private static float ClampMonotonic(float value, float p0, float p1, float p2, float p3)
     {
         bool rising = p0 <= p1 && p1 <= p2 && p2 <= p3;