diff --git a/Assets/Scripts/Fishing/New/View/FishingLine/Renderer/FishingNodeRope.cs b/Assets/Scripts/Fishing/New/View/FishingLine/Renderer/FishingNodeRope.cs
index 66d39d21c..4577e6689 100644
--- a/Assets/Scripts/Fishing/New/View/FishingLine/Renderer/FishingNodeRope.cs
+++ b/Assets/Scripts/Fishing/New/View/FishingLine/Renderer/FishingNodeRope.cs
@@ -42,9 +42,6 @@ public class FishingNodeRope : MonoBehaviour
     [Tooltip("当长度在变化时，额外把速度压掉一些（防抖）。0=不额外处理，1=变化时几乎清速度（建议只在收线生效）")] [SerializeField, Range(0f, 1f)]
     private float lengthChangeVelocityKill = 0.6f;
 
-    [Tooltip("允许的最小松弛余量（避免目标长度刚好等于锚点距离时抖动）")] [SerializeField, Min(0f)]
-    private float minSlack = 0.002f;
-
     [Header("Head Segment Clamp")] [Tooltip("第一段（起点->第1节点）允许的最小长度，避免收线时第一段被压到0导致数值炸")] [SerializeField, Min(0.0001f)]
     private float headMinLen = 0.01f;
 
@@ -158,16 +155,12 @@ public class FishingNodeRope : MonoBehaviour
     // node stability
     private int _lastDesiredNodes = 0;
 
-    // caches
-    private Transform _startTr;
-    private Transform _endTr;
-
     // precomputed
     private float _dt;
     private float _dt2;
     private float _kY;
     private float _kXZ;
-    private Transform _cameraTr;
+    private Camera _cachedCamera;
     private int _visibilityCheckCounter;
     private bool _isCulledByVisibility;
     private int _tIdleSubdiv = -1;
@@ -192,18 +185,22 @@ public class FishingNodeRope : MonoBehaviour
 
     private TCaches _tIdle;
     private TCaches _tMoving;
+    private enum SampleConstraintMode
+    {
+        GroundMinY,
+        WaterSurfaceY
+    }
 
     private void Awake()
     {
         _lineRenderer = GetComponent<LineRenderer>();
         _gravity = new Vector3(0f, -gravityStrength, 0f);
-
-        RefreshAnchorTransforms();
+        _dt = Mathf.Max(Time.fixedDeltaTime, 1e-6f);
+        _dt2 = _dt * _dt;
 
         InitLengthSystem();
         AllocateAndInitNodes();
         EnsureRenderCaches();
-        RefreshVisibilityState(true);
     }
 
     private void OnValidate()
@@ -238,12 +235,6 @@ public class FishingNodeRope : MonoBehaviour
         visibilityViewportPadding = Mathf.Clamp(visibilityViewportPadding, 0f, 0.5f);
     }
 
-    private void RefreshAnchorTransforms()
-    {
-        _startTr = startAnchor ? startAnchor.transform : null;
-        _endTr = endAnchor ? endAnchor.transform : null;
-    }
-
     private bool ShouldAlwaysSimulate()
     {
         if (!localOwnerAlwaysSimulate)
@@ -253,23 +244,28 @@ public class FishingNodeRope : MonoBehaviour
         return owner == null || owner.IsSelf;
     }
 
-    private Transform GetActiveCameraTransform()
+    private Vector3 GetStartPosition()
     {
-        Camera main = BaseCamera.Main;
-        if (main)
+        return startAnchor ? startAnchor.position : transform.position;
+    }
+
+    private Vector3 GetEndPosition()
+    {
+        return endAnchor ? endAnchor.position : transform.position;
+    }
+
+    private Camera GetActiveCamera()
+    {
+        if (BaseCamera.Main)
         {
-            _cameraTr = main.transform;
-            return _cameraTr;
+            _cachedCamera = BaseCamera.Main;
+            return _cachedCamera;
         }
 
-        if (!_cameraTr)
-        {
-            Camera fallback = Camera.main;
-            if (fallback)
-                _cameraTr = fallback.transform;
-        }
+        if (!_cachedCamera)
+            _cachedCamera = Camera.main;
 
-        return _cameraTr;
+        return _cachedCamera;
     }
 
     private static bool IsViewportPointVisible(Vector3 viewportPoint, float padding)
@@ -283,18 +279,12 @@ public class FishingNodeRope : MonoBehaviour
 
     private bool IsVisibleToMainCamera()
     {
-        Transform camTr = GetActiveCameraTransform();
-        if (!camTr)
-            return true;
-
-        Camera cam = camTr.GetComponent<Camera>();
-        if (!cam)
-            cam = BaseCamera.Main ? BaseCamera.Main : Camera.main;
+        Camera cam = GetActiveCamera();
         if (!cam)
             return true;
 
-        Vector3 start = _startTr ? _startTr.position : (startAnchor ? startAnchor.position : transform.position);
-        Vector3 end = _endTr ? _endTr.position : (endAnchor ? endAnchor.position : transform.position);
+        Vector3 start = GetStartPosition();
+        Vector3 end = GetEndPosition();
         Vector3 middle = (start + end) * 0.5f;
         float padding = visibilityViewportPadding;
 
@@ -345,8 +335,8 @@ public class FishingNodeRope : MonoBehaviour
         if (_physicsNodes < 2)
             return;
 
-        Vector3 start = _startTr ? _startTr.position : (startAnchor ? startAnchor.position : transform.position);
-        Vector3 end = _endTr ? _endTr.position : (endAnchor ? endAnchor.position : transform.position);
+        Vector3 start = GetStartPosition();
+        Vector3 end = GetEndPosition();
         int last = _physicsNodes - 1;
 
         for (int i = 0; i <= last; i++)
@@ -397,7 +387,7 @@ public class FishingNodeRope : MonoBehaviour
         _pCurr = new Vector3[maxPhysicsNodes];
         _pPrev = new Vector3[maxPhysicsNodes];
 
-        Vector3 start = startAnchor ? startAnchor.position : transform.position;
+        Vector3 start = GetStartPosition();
         Vector3 dir = Vector3.down;
 
         for (int i = 0; i < _physicsNodes; i++)
@@ -505,7 +495,6 @@ public class FishingNodeRope : MonoBehaviour
     {
         if (!startAnchor || !endAnchor) return;
 
-        RefreshAnchorTransforms();
         RefreshVisibilityState();
         if (_isCulledByVisibility)
             return;
@@ -525,11 +514,10 @@ public class FishingNodeRope : MonoBehaviour
 
         Simulate_VerletFast();
 
-
         for (int it = 0; it < iterations; it++)
         {
             LockAnchorsHard();
-            SolveDistanceConstraints_HeadOnly_Fast();
+            SolveDistanceConstraintsBidirectional(stiffness);
         }
 
         SolveHardDistanceConstraints(hardTightenIterations);
@@ -566,7 +554,6 @@ public class FishingNodeRope : MonoBehaviour
     {
         if (!startAnchor || !endAnchor || _pCurr == null || _physicsNodes < 2) return;
 
-        RefreshAnchorTransforms();
         if (_isCulledByVisibility)
             return;
 
@@ -574,13 +561,11 @@ public class FishingNodeRope : MonoBehaviour
 
         int last = _physicsNodes - 1;
 
-        Vector3 s = _startTr.position;
-        Vector3 e = _endTr.position;
+        Vector3 s = GetStartPosition();
+        Vector3 e = GetEndPosition();
 
         _pCurr[0] = s;
         _pCurr[last] = e;
-        // _pPrev[0] = s;
-        // _pPrev[last] = e;
 
         DrawHighResLine_Fast();
     }
@@ -638,7 +623,7 @@ public class FishingNodeRope : MonoBehaviour
         Array.Copy(_pCurr, 1, _pCurr, 1 + addCount, oldCount - 1);
         Array.Copy(_pPrev, 1, _pPrev, 1 + addCount, oldCount - 1);
 
-        Vector3 s = _startTr ? _startTr.position : startAnchor.position;
+        Vector3 s = GetStartPosition();
 
         Vector3 dir = Vector3.down;
         int firstOld = 1 + addCount;
@@ -710,8 +695,8 @@ public class FishingNodeRope : MonoBehaviour
     {
         if (!startAnchor || !endAnchor || _pCurr == null || _pPrev == null || _physicsNodes < 2) return;
 
-        Vector3 s = _startTr ? _startTr.position : startAnchor.position;
-        Vector3 e = _endTr ? _endTr.position : endAnchor.position;
+        Vector3 s = GetStartPosition();
+        Vector3 e = GetEndPosition();
 
         _pCurr[0] = s;
         _pPrev[0] = s - startAnchor.linearVelocity * _dt;
@@ -721,26 +706,16 @@ public class FishingNodeRope : MonoBehaviour
         _pPrev[last] = e - endAnchor.linearVelocity * _dt;
     }
 
-    private void SolveDistanceConstraints_HeadOnly_Fast()
-    {
-        SolveDistanceConstraints_HeadOnly_Bidirectional(stiffness);
-    }
-
     private void SolveHardDistanceConstraints(int extraIterations)
     {
         for (int it = 0; it < extraIterations; it++)
         {
             LockAnchorsHard();
-            SolveDistanceConstraints_HeadOnly_Hard();
+            SolveDistanceConstraintsBidirectional(1f);
         }
     }
 
-    private void SolveDistanceConstraints_HeadOnly_Hard()
-    {
-        SolveDistanceConstraints_HeadOnly_Bidirectional(1f);
-    }
-
-    private void SolveDistanceConstraints_HeadOnly_Bidirectional(float combinedStiffness)
+    private void SolveDistanceConstraintsBidirectional(float combinedStiffness)
     {
         int last = _physicsNodes - 1;
         if (last <= 0) return;
@@ -793,47 +768,10 @@ public class FishingNodeRope : MonoBehaviour
     {
         if (groundMask == 0) return;
 
-        int last = _physicsNodes - 1;
-        int step = Mathf.Max(1, groundSampleStep);
-
-        int prevSampleIdx = 1;
-        float prevMinY = SampleMinY(_pCurr[prevSampleIdx]);
-
-        ApplyMinY(prevSampleIdx, prevMinY);
-
-        for (int i = 1 + step; i < last; i += step)
-        {
-            float nextMinY = SampleMinY(_pCurr[i]);
-            ApplyMinY(i, nextMinY);
-
-            if (groundInterpolate)
-            {
-                int a = prevSampleIdx;
-                int b = i;
-                int span = b - a;
-                for (int j = 1; j < span; j++)
-                {
-                    int idx = a + j;
-                    float t = j / (float)span;
-                    float minY = Mathf.Lerp(prevMinY, nextMinY, t);
-                    ApplyMinY(idx, minY);
-                }
-            }
-            else
-            {
-                for (int idx = prevSampleIdx + 1; idx < i; idx++)
-                    ApplyMinY(idx, prevMinY);
-            }
-
-            prevSampleIdx = i;
-            prevMinY = nextMinY;
-        }
-
-        for (int i = prevSampleIdx + 1; i < last; i++)
-            ApplyMinY(i, prevMinY);
+        ApplySampledConstraint(SampleConstraintMode.GroundMinY, groundSampleStep, groundInterpolate);
     }
 
-    private float SampleMinY(Vector3 p)
+    private float SampleGroundMinY(Vector3 p)
     {
         Vector3 origin = p + Vector3.up * groundCastHeight;
         if (Physics.Raycast(origin, Vector3.down, out RaycastHit hit, groundCastDistance, groundMask,
@@ -865,46 +803,87 @@ public class FishingNodeRope : MonoBehaviour
         int last = _physicsNodes - 1;
         if (last <= 1) return;
 
-        int step = Mathf.Max(1, waterSampleStep);
         float surfaceY = waterLevelY + waterSurfaceOffset;
         bool startUnderWater = _pCurr[0].y < surfaceY;
         int startAdjacentIdx = GetStartAdjacentNodeIndex(last);
 
-        int prevSampleIdx = 1;
-        float prevSurfaceY = surfaceY;
+        ApplySampledConstraint(
+            SampleConstraintMode.WaterSurfaceY,
+            waterSampleStep,
+            waterInterpolate,
+            surfaceY,
+            startUnderWater,
+            startAdjacentIdx
+        );
+    }
 
-        ApplyWaterSurface(prevSampleIdx, prevSurfaceY, startUnderWater, startAdjacentIdx);
+    private void ApplySampledConstraint(SampleConstraintMode mode, int sampleStep, bool interpolate,
+        float constantValue = 0f, bool startUnderWater = false, int startAdjacentIdx = -1)
+    {
+        int last = _physicsNodes - 1;
+        if (last <= 1) return;
+
+        int step = Mathf.Max(1, sampleStep);
+        int prevSampleIdx = 1;
+        float prevValue = GetConstraintSampleValue(mode, prevSampleIdx, constantValue);
+
+        ApplyConstraintValue(mode, prevSampleIdx, prevValue, startUnderWater, startAdjacentIdx);
 
         for (int i = 1 + step; i < last; i += step)
         {
-            float nextSurfaceY = surfaceY;
-            ApplyWaterSurface(i, nextSurfaceY, startUnderWater, startAdjacentIdx);
+            float nextValue = GetConstraintSampleValue(mode, i, constantValue);
+            ApplyConstraintValue(mode, i, nextValue, startUnderWater, startAdjacentIdx);
 
-            if (waterInterpolate)
+            if (interpolate)
             {
-                int a = prevSampleIdx;
-                int b = i;
-                int span = b - a;
+                int span = i - prevSampleIdx;
                 for (int j = 1; j < span; j++)
                 {
-                    int idx = a + j;
+                    int idx = prevSampleIdx + j;
                     float t = j / (float)span;
-                    float y = Mathf.Lerp(prevSurfaceY, nextSurfaceY, t);
-                    ApplyWaterSurface(idx, y, startUnderWater, startAdjacentIdx);
+                    float value = Mathf.Lerp(prevValue, nextValue, t);
+                    ApplyConstraintValue(mode, idx, value, startUnderWater, startAdjacentIdx);
                 }
             }
             else
             {
                 for (int idx = prevSampleIdx + 1; idx < i; idx++)
-                    ApplyWaterSurface(idx, prevSurfaceY, startUnderWater, startAdjacentIdx);
+                    ApplyConstraintValue(mode, idx, prevValue, startUnderWater, startAdjacentIdx);
             }
 
             prevSampleIdx = i;
-            prevSurfaceY = nextSurfaceY;
+            prevValue = nextValue;
         }
 
         for (int i = prevSampleIdx + 1; i < last; i++)
-            ApplyWaterSurface(i, prevSurfaceY, startUnderWater, startAdjacentIdx);
+            ApplyConstraintValue(mode, i, prevValue, startUnderWater, startAdjacentIdx);
+    }
+
+    private float GetConstraintSampleValue(SampleConstraintMode mode, int index, float constantValue)
+    {
+        switch (mode)
+        {
+            case SampleConstraintMode.GroundMinY:
+                return SampleGroundMinY(_pCurr[index]);
+            case SampleConstraintMode.WaterSurfaceY:
+                return constantValue;
+            default:
+                return constantValue;
+        }
+    }
+
+    private void ApplyConstraintValue(SampleConstraintMode mode, int index, float value, bool startUnderWater,
+        int startAdjacentIdx)
+    {
+        switch (mode)
+        {
+            case SampleConstraintMode.GroundMinY:
+                ApplyMinY(index, value);
+                break;
+            case SampleConstraintMode.WaterSurfaceY:
+                ApplyWaterSurface(index, value, startUnderWater, startAdjacentIdx);
+                break;
+        }
     }
 
     private int GetStartAdjacentNodeIndex(int last)
@@ -958,13 +937,6 @@ public class FishingNodeRope : MonoBehaviour
         int subdiv = PickRenderSubdivisions_Fast();
         TCaches tc = (subdiv == renderSubdivisionsMoving) ? _tMoving : _tIdle;
 
-        int needed = (_physicsNodes - 1) * subdiv + 1;
-        if (needed > _rCapacity)
-        {
-            _rCapacity = needed;
-            _rPoints = new Vector3[_rCapacity];
-        }
-
         int idx = 0;
         int last = _physicsNodes - 1;
 
@@ -1068,4 +1040,4 @@ public class FishingNodeRope : MonoBehaviour
         for (int i = 0; i < _physicsNodes; i++)
             Gizmos.DrawSphere(_pCurr[i], 0.01f);
     }
-}
\ No newline at end of file
+}