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