docs: update math API docs
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# Quaternion::operator*
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```cpp
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Quaternion operator*(const Quaternion& other) const;
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Vector3 operator*(const Quaternion& q, const Vector3& v);
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```
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四元数乘法运算符。
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**成员函数版本(四元数 * 四元数):**
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- `other` - 另一个四元数
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- **返回:** 组合旋转后的四元数
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**全局函数版本(四元数 * 向量):**
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- `q` - 四元数
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- `v` - 要旋转的三维向量
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- **返回:** 旋转后的向量
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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 <XCEngine/Math/Quaternion.h>
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#include <XCEngine/Math/Vector3.h>
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using namespace XCEngine::Math;
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Quaternion q1 = Quaternion::FromAxisAngle(Vector3::Up(), Math::Radians(90.0f));
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Quaternion q2 = Quaternion::FromAxisAngle(Vector3::Right(), Math::Radians(90.0f));
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Quaternion combined = q1 * q2;
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Vector3 rotated = q1 * Vector3::Forward();
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```
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## 相关文档
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- [Quaternion](quaternion.md) - 返回类总览
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