[Home](./index.md) > [server](./server.md) > [ParticleEmitter](./server.particleemitter.md) > [alphaTest](./server.particleemitter.alphatest.md) ## ParticleEmitter.alphaTest property The alpha test value, discards particle texture pixels with alpha opacity less than this value. **Signature:** ```typescript get alphaTest(): number | undefined; ```