hytopia/docs/server.particleemitter.setopacitystart.md

The HYTOPIA SDK makes it easy for developers to create massively multiplayer games using JavaScript or TypeScript.

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[Home](./index.md) &gt; [server](./server.md) &gt; [ParticleEmitter](./server.particleemitter.md) &gt; [setOpacityStart](./server.particleemitter.setopacitystart.md)

## ParticleEmitter.setOpacityStart() method

Sets the opacity of an emitted particle at the start of its lifetime.

**Signature:**

```typescript
setOpacityStart(opacityStart: number): void;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td>

opacityStart


</td><td>

number


</td><td>

The opacity of an emitted particle at the start of its lifetime.


</td></tr>
</tbody></table>
**Returns:**

void