Vector3.Cross

# [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html).Cross

public static [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **Cross** ([Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **lhs**, [Vector3](https://docs.unity3d.com/cn/2019.4/ScriptReference/Vector3.html) **rhs**);

## 描述

两个向量的叉积。

两个向量的叉积生成第三个向量， 该向量垂直于两个输入向量。结果的大小等于： 将两个输入的大小相乘，然后乘以输入之间角度的正弦值。 可以使用“左手规则”确定结果向量的方向。

![](/media/202206/1_1655866509.png)
*对 Cross(a, b) 应用左手规则。*

```
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    // Get the normal to a triangle from the three corner points, a, b and c.
    Vector3 GetNormal(Vector3 a, Vector3 b, Vector3 c)
    {
        // Find vectors corresponding to two of the sides of the triangle.
        Vector3 side1 = b - a;
        Vector3 side2 = c - a;

// Cross the vectors to get a perpendicular vector, then normalize it.
        return Vector3.Cross(side1, side2).normalized;
    }
}
```