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# Matrix4 / Matrix4x4
4x4 矩阵结构体,用于表示完整的 3D 变换(平移、旋转、缩放)、视图和投影变换。
**头文件:** `#include <XCEngine/Math/Matrix4.h>`
**命名空间:** `XCEngine::Math`
## 类型别名
```cpp
using Matrix4 = Matrix4x4;
```
## 存储方式
行优先存储 (row-major)
```
m[0][0] m[0][1] m[0][2] m[0][3]
m[1][0] m[1][1] m[1][2] m[1][3]
m[2][0] m[2][1] m[2][2] m[2][3]
m[3][0] m[3][1] m[3][2] m[3][3]
```
## 静态工厂方法
### 基础变换
| 方法 | 返回值 | 描述 |
|------|--------|------|
| [Identity()](identity.md) | `Matrix4` | 单位矩阵 |
| [Zero()](zero.md) | `Matrix4` | 零矩阵 |
| [Translation(v)](translation.md) | `Matrix4` | 平移矩阵 |
| [Scale(v)](scale.md) | `Matrix4` | 缩放矩阵 |
| [Rotation(q)](rotation.md) | `Matrix4` | 旋转矩阵(四元数) |
| [TRS(translation, rotation, scale)](trs.md) | `Matrix4` | 完整变换 |
### 旋转
| 方法 | 返回值 | 描述 |
|------|--------|------|
| [RotationX(radians)](rotationx.md) | `Matrix4` | X 轴旋转 |
| [RotationY(radians)](rotationy.md) | `Matrix4` | Y 轴旋转 |
| [RotationZ(radians)](rotationz.md) | `Matrix4` | Z 轴旋转 |
### 相机变换
| 方法 | 返回值 | 描述 |
|------|--------|------|
| [LookAt(eye, target, up)](lookat.md) | `Matrix4` | 视图矩阵 |
| [Perspective(fov, aspect, near, far)](perspective.md) | `Matrix4` | 透视投影 |
| [Orthographic(left, right, bottom, top, near, far)](orthographic.md) | `Matrix4` | 正交投影 |
## 实例方法
### 乘法
| 方法 | 返回值 | 描述 |
|------|--------|------|
| `operator*(Matrix4, Matrix4)` | `Matrix4` | 矩阵乘法 |
| `operator*(Matrix4, Vector4)` | `Vector4` | 矩阵-向量乘法 |
| [MultiplyPoint(v)](multiplypoint.md) | `Vector3` | 点变换(带平移) |
| [MultiplyVector(v)](multiplyvector.md) | `Vector3` | 方向变换(不带平移) |
### 分解
| 方法 | 返回值 | 描述 |
|------|--------|------|
| [Transpose()](transpose.md) | `Matrix4` | 转置矩阵 |
| [Inverse()](inverse.md) | `Matrix4` | 逆矩阵 |
| [Determinant()](determinant.md) | `float` | 行列式 |
| [GetTranslation()](gettranslation.md) | `Vector3` | 获取平移分量 |
| [GetRotation()](getrotation.md) | `Quaternion` | 获取旋转分量 |
| [GetScale()](getscale.md) | `Vector3` | 获取缩放分量 |
| [Decompose(translation, rotation, scale)](decompose.md) | `void` | 分解所有分量 |
## 相关文档
- [Math 模块总览](../math.md) - 返回 Math 模块总览