34 lines
649 B
Markdown
34 lines
649 B
Markdown
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# OBB::GetAxis
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```cpp
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Vector3 GetAxis(int index) const;
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```
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获取 OBB 在指定索引处的局部轴方向。index 取值为 0、1、2，分别对应局部坐标系的 X、Y、Z 轴。
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**参数：**
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- `index` - 轴索引（0=X轴，1=Y轴，2=Z轴）
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**返回：** 对应索引处的轴方向向量（已归一化）
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**异常：** 无
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**线程安全：** ✅
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**复杂度：** O(1)
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**示例：**
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```cpp
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#include "AABB.h"
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#include "Vector3.h"
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using namespace XCEngine::Math;
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OBB obb(Vector3(0.0f, 0.0f, 0.0f), Vector3(1.0f, 0.5f, 1.0f));
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Vector3 axisX = obb.GetAxis(0);
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Vector3 axisY = obb.GetAxis(1);
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Vector3 axisZ = obb.GetAxis(2);
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```
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