docs: update math API docs
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# Matrix4::LookAt
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# Matrix4x4::LookAt
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```cpp
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static Matrix4 LookAt(const Vector3& eye, const Vector3& target, const Vector3& up)
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static Matrix4x4 LookAt(const Vector3& eye, const Vector3& target, const Vector3& up)
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```
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创建视图矩阵(观察矩阵)。
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创建视图矩阵(观察矩阵)。用于将世界空间中的点转换到摄像机视角。
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**参数:**
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- `eye` - 相机位置
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- `eye` - 摄像机位置
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- `target` - 观察目标点
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- `up` - 世界空间中的上方向
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- `up` - 摄像机上方向向量
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**返回:** `Matrix4` - 视图矩阵
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**返回:** 视图矩阵
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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 view = Matrix4::LookAt(cameraPos, target, Vector3::Up());
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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 view = Matrix4::LookAt(
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Vector3(0.0f, 1.0f, 5.0f),
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Vector3(0.0f, 0.0f, 0.0f),
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Vector3(0.0f, 1.0f, 0.0f)
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);
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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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- [Perspective](perspective.md) - 透视投影
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- [Orthographic](orthographic.md) - 正交投影
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