# PSYS_PART_BF_ZERO

*LSL constant*

```lsl
integer PSYS_PART_BF_ZERO = 1;
```

Zeros out the source or destination RGBA values.

Constant groups: [ParticleBlendFunc](/constants/groups/ParticleBlendFunc/)

:::note[Documentation]
This entry is documented in the LSL definitions. No matching wiki article is present in this local collection. Its inclusion here does not establish availability on every simulator.
:::

---

From lsl.dev: https://lsl.dev/constants/PSYS_PART_BF_ZERO/