@three3d/tools/doc/api/tools.getincludedangle.md

@three3d/tools 提供了 ThreeJS 常用的工具库

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## getIncludedAngle() function

计算两个向量的夹角

**Signature:**

```typescript
export declare function getIncludedAngle(from: Vector3, to: Vector3): number;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  from | Vector3 | 起始向量 |
|  to | Vector3 | 目标向量 |

**Returns:**

number

返回一个 0 到 pi（弧度）的数值

## Remarks

与 `Vector3.angleTo(v)` 不同的是：当 from 或 to 为零时，会返回 0