# PSYS_PART_BOUNCE_MASK

*LSL constant*

```lsl
integer PSYS_PART_BOUNCE_MASK = 0x4;
```

Particle flag causing particles to bounce off a plane at the emitter object's Z height.

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

:::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.
:::

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