hytopia/docs/server.particleemittereventpayloads._particle_emitter.set_opacity_start_variance_.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; [ParticleEmitterEventPayloads](./server.particleemittereventpayloads.md) &gt; ["PARTICLE\_EMITTER.SET\_OPACITY\_START\_VARIANCE"](./server.particleemittereventpayloads._particle_emitter.set_opacity_start_variance_.md)

## ParticleEmitterEventPayloads."PARTICLE\_EMITTER.SET\_OPACITY\_START\_VARIANCE" property

Emitted when the opacity variance of an emitted particle at the start of its lifetime is set.

**Signature:**

```typescript
[ParticleEmitterEvent.SET_OPACITY_START_VARIANCE]: {
        particleEmitter: ParticleEmitter;
        opacityStartVariance: number;
    };
```