导入角色动画，和增加角色控制

Assets/Scripts/BobberBuoyancy.cs

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+using UnityEngine;
+
+[RequireComponent(typeof(Rigidbody))]
+public class BobberBuoyancy : MonoBehaviour
+{
+    [Header("Water")]
+    public float waterLevel = 0f;            // 水面是 0
+    public Vector3 waterFlow = Vector3.zero;
+
+    [Header("Bobber Size (origin at bottom)")]
+    public float bobberHeight = 0.18f;        // 浮漂总高度（底部原点 → 顶部）
+
+    [Header("Buoyancy")]
+    public float maxBuoyancy = 12f;           // 完全浸没浮力
+    public float buoyancyMultiplier = 1.0f;
+    public float waterDrag = 0.7f;
+    public float waterAngularDrag = 0.4f;
+
+    [Header("Vertical Damping（控制“慢慢上浮”，避免弹跳）")]
+    public float verticalDamping = 4.0f;      // 数值越大，上浮越慢、越不弹
+
+    [Header("Upright")]
+    public float uprightStrength = 8f;        // 站漂恢复力
+    public float uprightDamping = 1.2f;
+
+    [Header("Lay Down (躺漂)")]
+    public float layDownThreshold = 0.15f;    // 低于 15% 浸没 → 转入躺漂模式
+    public float layDownUprightMultiplier = 0.2f;  // 躺漂时保留多少站立力度（越小越“翘头”）
+
+    private Rigidbody rb;
+
+    private void Awake()
+    {
+        rb = GetComponent<Rigidbody>();
+        rb.useGravity = true;
+
+        // 重心稍微靠上，配合 AddForceAtPosition，才能让“底在水里、头上翘”
+        rb.centerOfMass = new Vector3(0, bobberHeight * 0.4f, 0);
+    }
+
+    private void FixedUpdate()
+    {
+        ApplyBuoyancy();
+        ApplyFlowForce();
+        ApplyOrientationControl();
+    }
+
+    void ApplyBuoyancy()
+    {
+        float bottom = rb.position.y;                      // 原点就是最底部
+        float depth = waterLevel - bottom;                 // 浸入深度 = 水面 - 底部
+
+        if (depth <= 0f) return;                           // 完全在水面上方，无浮力
+
+        // 当前浸没比例
+        float submersionRatio = Mathf.Clamp01(depth / bobberHeight);
+
+        // 基础浮力（和你之前一致）
+        float baseForce = maxBuoyancy * submersionRatio * buoyancyMultiplier;
+
+        // ⭐ 竖直速度（用你原来习惯的 linearVelocity）
+        float vy = rb.linearVelocity.y;
+
+        // ⭐ 阻尼项：速度越快，反向力越大
+        //   下沉很快 → 给一个向上的阻尼（减缓下沉）
+        //   向上很快 → 给一个向下的阻尼（防止弹出水面）
+        float damping = -vy * verticalDamping;
+
+        // 总的向上力：基础浮力 + 阻尼修正
+        float totalUpForce = baseForce + damping;
+
+        // 物理上浮力不能把它“往下按”，所以最少为 0
+        if (totalUpForce < 0f) totalUpForce = 0f;
+
+        // ⭐ 浮力作用点 = 浸没体积中心（不动，保持你之前的设计）
+        float clampedDepth = Mathf.Clamp(depth, 0, bobberHeight);
+        float centerY = bottom + clampedDepth * 0.5f;
+        Vector3 buoyancyPoint = new Vector3(rb.position.x, centerY, rb.position.z);
+
+        rb.AddForceAtPosition(Vector3.up * totalUpForce, buoyancyPoint, ForceMode.Acceleration);
+
+        // 水中阻力（保留原逻辑）
+        rb.AddForce(-rb.linearVelocity * waterDrag, ForceMode.Acceleration);
+        rb.AddTorque(-rb.angularVelocity * waterAngularDrag, ForceMode.Acceleration);
+    }
+
+    void ApplyFlowForce()
+    {
+        if (waterFlow.sqrMagnitude <= 0.0001f) return;
+        rb.AddForce((waterFlow - rb.linearVelocity) * 0.3f, ForceMode.Acceleration);
+    }
+
+    void ApplyOrientationControl()
+    {
+        float bottom = rb.position.y;
+        float depth = waterLevel - bottom;
+        float submersionRatio = Mathf.Clamp01(depth / bobberHeight);
+
+        Vector3 up = transform.up;
+        Vector3 worldUp = Vector3.up;
+
+        if (submersionRatio > layDownThreshold)
+        {
+            // 深浸 → 正常站漂
+            Vector3 uprightTorqueVec =
+                Vector3.Cross(up, worldUp) * uprightStrength
+                - rb.angularVelocity * uprightDamping;
+
+            rb.AddTorque(uprightTorqueVec, ForceMode.Acceleration);
+        }
+        else
+        {
+            // 浅浸 → “躺漂”，只保留少量站立力，让它自然斜、头上翘
+            float reduced = uprightStrength * layDownUprightMultiplier;
+
+            Vector3 uprightTorqueVec =
+                Vector3.Cross(up, worldUp) * reduced
+                - rb.angularVelocity * uprightDamping;
+
+            rb.AddTorque(uprightTorqueVec, ForceMode.Acceleration);
+        }
+    }
+}