95 lines
2.8 KiB
C#
95 lines
2.8 KiB
C#
using UnityEngine;
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[RequireComponent(typeof(Rigidbody))]
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[RequireComponent(typeof(CapsuleCollider))]
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public class CapsuleBuoyancy : MonoBehaviour
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{
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[Header("Water Settings")]
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public float waterHeight = 0f; // 水面高度
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public float waterDensity = 1000f; // 水密度
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[Header("Buoyancy Settings")]
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public int samplePoints = 8; // 采样点数量
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public float buoyancyMultiplier = 1.0f; // 浮力强度调节
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public float waterDrag = 1.5f; // 水阻力
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public float waterAngularDrag = 1.5f; // 水角阻力
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private Rigidbody rb;
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private CapsuleCollider capsule;
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private float capsuleVolume;
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private float gravity;
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void Start()
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{
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rb = GetComponent<Rigidbody>();
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capsule = GetComponent<CapsuleCollider>();
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gravity = Physics.gravity.magnitude;
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CalculateCapsuleVolume();
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}
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void FixedUpdate()
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{
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ApplyBuoyancy();
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}
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void CalculateCapsuleVolume()
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{
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float radius = capsule.radius * Mathf.Max(transform.localScale.x, transform.localScale.z);
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float height = Mathf.Max(0, capsule.height * transform.localScale.y - 2f * radius);
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float cylinderVolume = Mathf.PI * radius * radius * height;
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float sphereVolume = (4f / 3f) * Mathf.PI * radius * radius * radius;
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capsuleVolume = cylinderVolume + sphereVolume;
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}
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void ApplyBuoyancy()
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{
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float submergedRatioTotal = 0f;
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for (int i = 0; i < samplePoints; i++)
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{
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float t = (float)i / (samplePoints - 1);
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Vector3 localPoint = Vector3.up * Mathf.Lerp(
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-capsule.height * 0.5f + capsule.radius,
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capsule.height * 0.5f - capsule.radius,
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t);
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Vector3 worldPoint = transform.TransformPoint(localPoint);
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float depth = waterHeight - worldPoint.y;
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if (depth > 0f)
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{
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float normalizedDepth = Mathf.Clamp01(depth / (capsule.height / samplePoints));
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submergedRatioTotal += normalizedDepth;
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float forceMagnitude =
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waterDensity *
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gravity *
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(capsuleVolume / samplePoints) *
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normalizedDepth *
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buoyancyMultiplier;
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Vector3 buoyancyForce = Vector3.up * forceMagnitude;
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rb.AddForceAtPosition(buoyancyForce, worldPoint, ForceMode.Force);
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}
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}
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// 如果在水中，加阻力
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if (submergedRatioTotal > 0f)
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{
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rb.linearDamping = waterDrag;
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rb.angularDamping = waterAngularDrag;
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}
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else
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{
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rb.linearDamping = 0f;
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rb.angularDamping = 0.05f;
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}
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}
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} |