@three3d/tools
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@three3d/tools 提供了 ThreeJS 常用的工具库
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[Home](./index.md) > [@three3d/tools](./tools.md) > [Azimuth](./tools.azimuth.md) > [\_up](./tools.azimuth._up.md)
## Azimuth.\_up property
**Signature:**
```typescript
protected _up?: Vector3 | null;
```