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[Home](./index.md) &gt; [server](./server.md) &gt; [ParticleEmitterEventPayloads](./server.particleemittereventpayloads.md) &gt; ["PARTICLE\_EMITTER.SET\_OPACITY\_START"](./server.particleemittereventpayloads._particle_emitter.set_opacity_start_.md)

## ParticleEmitterEventPayloads."PARTICLE\_EMITTER.SET\_OPACITY\_START" property

Emitted when the opacity of an emitted particle at the start of its lifetime is set.

**Signature:**

```typescript
[ParticleEmitterEvent.SET_OPACITY_START]: {
        particleEmitter: ParticleEmitter;
        opacityStart: number;
    };
```