85 lines
3.7 KiB
C#
85 lines
3.7 KiB
C#
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using UnityEngine;
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namespace SLSUtilities.General
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{
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public static class ColliderExtensions
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{
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/// <summary>
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/// 判断一个世界坐标点是否在 BoxCollider 内部（支持旋转和缩放）
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/// </summary>
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public static bool IsPointInside(this BoxCollider box, Vector3 worldPoint)
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{
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// 1. 将世界坐标转为该 Collider 的本地坐标（处理了旋转和位置）
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Vector3 localPoint = box.transform.InverseTransformPoint(worldPoint);
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// 2. 减去中心偏移
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localPoint -= box.center;
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// 3. 计算实际的半长宽高（考虑 LossyScale 缩放）
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// 注意：BoxCollider 的 size 已经包含了本地缩放，InverseTransformPoint 已经处理了缩放的影响
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Vector3 halfSize = box.size * 0.5f;
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// 4. AABB 判定
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return Mathf.Abs(localPoint.x) <= halfSize.x &&
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Mathf.Abs(localPoint.y) <= halfSize.y &&
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Mathf.Abs(localPoint.z) <= halfSize.z;
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}
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/// <summary>
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/// 判断一个世界坐标点是否在 SphereCollider 内部
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/// </summary>
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public static bool IsPointInside(this SphereCollider sphere, Vector3 worldPoint)
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{
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// 考虑中心偏移的世界坐标中心点
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Vector3 center = sphere.transform.TransformPoint(sphere.center);
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// 计算缩放后的实际半径（Unity 以三个轴中缩放最大的为准）
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Vector3 lossyScale = sphere.transform.lossyScale;
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float maxScale = Mathf.Max(lossyScale.x, Mathf.Max(lossyScale.y, lossyScale.z));
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float scaledRadius = sphere.radius * maxScale;
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// 距离平方判定，性能最高
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float sqrDistance = (worldPoint - center).sqrMagnitude;
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return sqrDistance <= (scaledRadius * scaledRadius);
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}
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/// <summary>
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/// 判断一个世界坐标点是否在 CapsuleCollider 内部
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/// </summary>
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public static bool IsPointInside(this CapsuleCollider capsule, Vector3 worldPoint)
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{
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// 转为本地坐标
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Vector3 localPoint = capsule.transform.InverseTransformPoint(worldPoint);
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localPoint -= capsule.center;
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// 计算胶囊体内部中心轴线的半高度（不含两头的半圆）
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float radius = capsule.radius;
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float halfHeight = Mathf.Max(0f, (capsule.height * 0.5f) - radius);
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// 根据方向计算点到中心线段的最短距离
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// direction: 0 = X, 1 = Y, 2 = Z
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Vector3 closestPointOnAxis = Vector3.zero;
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switch (capsule.direction)
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{
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case 0: closestPointOnAxis.x = Mathf.Clamp(localPoint.x, -halfHeight, halfHeight); break;
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case 1: closestPointOnAxis.y = Mathf.Clamp(localPoint.y, -halfHeight, halfHeight); break;
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case 2: closestPointOnAxis.z = Mathf.Clamp(localPoint.z, -halfHeight, halfHeight); break;
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}
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return (localPoint - closestPointOnAxis).sqrMagnitude <= (radius * radius);
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}
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/// <summary>
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/// 通用入口：根据 Collider 类型自动选择检测方法
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/// </summary>
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public static bool IsPointInside(this Collider collider, Vector3 worldPoint)
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{
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if (collider is BoxCollider box) return box.IsPointInside(worldPoint);
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if (collider is SphereCollider sphere) return sphere.IsPointInside(worldPoint);
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if (collider is CapsuleCollider capsule) return capsule.IsPointInside(worldPoint);
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// 如果是 MeshCollider 等复杂形状，回退到 Bounds 粗略检测
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return collider.bounds.Contains(worldPoint);
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}
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}
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}
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