[Home](./index.md) > [server](./server.md) > [ParticleEmitterOptions](./server.particleemitteroptions.md) > [opacityEnd](./server.particleemitteroptions.opacityend.md) ## ParticleEmitterOptions.opacityEnd property The opacity of an emitted particle at the end of its lifetime. **Signature:** ```typescript opacityEnd?: number; ```