@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) > [FrontUpFrame](./tools.frontupframe.md) > [binormal](./tools.frontupframe.binormal.md)
## FrontUpFrame.binormal property
副法线；作为x轴
**Signature:**
```typescript
binormal: Vector3;
```