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# AABB / OBB
轴对齐包围盒 (AABB) 和有向包围盒 (OBB)。
**头文件:** `#include <XCEngine/Math/AABB.h>`
**命名空间:** `XCEngine::Math`
## AABB
`AABB` 在 Math 库中通过 `Bounds` 类型实现,参见 [./bounds/bounds.md](../bounds/bounds.md)。
## OBB - 有向包围盒
OBB 是可以任意方向旋转的包围盒。
```cpp
struct OBB {
Vector3 center;
Vector3 extents;
Matrix4 transform;
};
```
### 构造函数
- `OBB()` - 默认构造
- `OBB(const Vector3& center, const Vector3& extents)` - 从中心和半长构造
### 实例方法
| 方法 | 返回值 | 描述 |
|------|--------|------|
| [GetAxis(index)](getaxis.md) | `Vector3` | 获取局部轴index 必须是 0、1 或 2 |
| [GetMin()](../box/getmin.md) | `Vector3` | 局部空间最小点 |
| [GetMax()](../box/getmax.md) | `Vector3` | 局部空间最大点 |
| [Contains(point)](../box/contains.md) | `bool` | 点是否在 OBB 内 |
| [Intersects(OBB)](intersects-obb.md) | `bool` | 与另一个 OBB 相交 |
| [Intersects(Sphere)](intersects-sphere.md) | `bool` | 与球体相交 |
## 相关文档
- [Math 模块总览](../math.md) - 返回 Math 模块总览