docs: update math API docs
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# Matrix4::RotationX
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# Matrix4x4::RotationX
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```cpp
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static Matrix4 RotationX(float radians)
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static Matrix4x4 RotationX(float radians)
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```
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创建绕 X 轴旋转的矩阵。
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创建绕 X 轴旋转的矩阵。角度为正时,按右手定则逆时针旋转。
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**参数:**
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- `radians` - 旋转角度(弧度)
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**返回:** `Matrix4` - 旋转矩阵
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**返回:** 绕 X 轴旋转的矩阵
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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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Matrix4 rotX = Matrix4::RotationX(Math::HALF_PI);
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#include "XCEngine/Math/Matrix4.h"
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#include "XCEngine/Math/Vector3.h"
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using namespace XCEngine::Math;
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Matrix4 rotX = Matrix4::RotationX(3.14159265f / 2.0f); // 90 度
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Vector3 point(1.0f, 0.0f, 0.0f);
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Vector3 rotated = rotX.MultiplyVector(point);
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// point 绕 X 轴旋转 90 度
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```
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## 相关文档
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- [Matrix4](matrix4.md) - 返回类总览
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- [RotationY](rotationy.md) - 绕 Y 轴旋转
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- [RotationZ](rotationz.md) - 绕 Z 轴旋转
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