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[Home](./index.md) &gt; [@three3d/volume](./volume.md) &gt; [VolumeMaterialOptions](./volume.volumematerialoptions.md) &gt; [opacity](./volume.volumematerialoptions.opacity.md)

## VolumeMaterialOptions.opacity property

透明度

**Signature:**

```typescript
opacity?: number | null;
```

## Remarks

决定整体的透明度