docs: update math API docs

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2026-03-20 02:35:15 +08:00
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# Vector4::Vector4 (from Vector3)
```cpp
explicit Vector4(const Vector3& v, float w = 0.0f)
```
从 Vector3 构造四维向量w 分量默认为 0.0f。
**参数:**
- `v` - 源 Vector3 向量
- `w` - W 分量(默认值为 `0.0f`
**返回:** 新创建的 Vector4 实例
**示例:**
```cpp
Vector3 v3(1.0f, 2.0f, 3.0f);
Vector4 v4a(v3);
Vector4 v4b(v3, 1.0f);
```
## 相关文档
- [Vector4 总览](vector4.md) - 返回类总览