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Assets/Scripts/Rope.cs

@@ -11,7 +11,7 @@ public class Rope : MonoBehaviour
 
     [SerializeField] float nodeColliderRadius = 0.2f;
     [SerializeField] float gravityStrength = 2;
-    [SerializeField, Range(1, 500)] int totalNodes = 100;
+    [SerializeField] float totalLength = 10f; // 新增总长度参数
     [SerializeField, Range(0, 1)] float velocityDampen = 0.95f;
     [SerializeField, Range(0, 0.99f)] float stiffness = 0.8f;
     [SerializeField, Range(1, 10)] int iterateCollisionsEvery = 1;
@@ -36,9 +36,20 @@ public class Rope : MonoBehaviour
     LineRenderer lineRenderer;
     GameObject nodeTester;
     SphereCollider nodeCollider;
+    int totalNodes; // 现在由代码计算
 
     void Awake()
     {
+        // 计算节点数量
+        totalNodes = Mathf.FloorToInt(totalLength / nodeDistance) + 1;
+        float remainingLength = totalLength % nodeDistance;
+
+        // 如果剩余长度大于0，增加一个节点
+        if (remainingLength > 0 && totalLength > nodeDistance)
+        {
+            totalNodes++;
+        }
+
         // 初始化数组
         currentNodePositions = new Vector3[totalNodes];
         previousNodePositions = new Vector3[totalNodes];
@@ -59,9 +70,12 @@ public class Rope : MonoBehaviour
         Vector3 startPos = transform.position;
         for (int i = 0; i < totalNodes; i++)
         {
+            // 如果是最后一个节点且有剩余长度，使用剩余长度
+            float distance = (i == totalNodes - 1 && remainingLength > 0) ? remainingLength : nodeDistance;
+
             currentNodePositions[i] = startPos;
             previousNodePositions[i] = startPos;
-            startPos.y -= nodeDistance;
+            startPos.y -= distance;
         }
 
         // 设置线渲染器
@@ -141,7 +155,6 @@ public class Rope : MonoBehaviour
 
         // 预计算所有常用值
         float halfStiffness = 0.5f * stiffness;
-        float sqrNodeDistance = nodeDistance * nodeDistance;
         int nodeCountMinusOne = totalNodes - 1;
 
         for (int i = 0; i < nodeCountMinusOne; i++)
@@ -150,13 +163,19 @@ public class Rope : MonoBehaviour
             Vector3 node2 = currentNodePositions[i + 1];
             Vector3 diff = node1 - node2;
 
+            // 计算期望的距离 - 如果是最后一个段且有剩余长度，使用剩余长度
+            float desiredDistance = (i == nodeCountMinusOne - 1 && (totalLength % nodeDistance) > 0)
+                ? (totalLength % nodeDistance)
+                : nodeDistance;
+
+            float sqrDesiredDistance = desiredDistance * desiredDistance;
             float sqrDistance = diff.x * diff.x + diff.y * diff.y + diff.z * diff.z;
 
             // 只有当距离差异超过一定阈值时才调整
-            if (Mathf.Abs(sqrDistance - sqrNodeDistance) > 0.001f)
+            if (Mathf.Abs(sqrDistance - sqrDesiredDistance) > 0.001f)
             {
                 float distance = Mathf.Sqrt(sqrDistance);
-                float difference = nodeDistance - distance;
+                float difference = desiredDistance - distance;
                 Vector3 direction = diff / distance; // 比 normalized 更快
 
                 Vector3 adjustment = direction * (difference * halfStiffness);