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