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