# PSYS_PART_FOLLOW_VELOCITY_MASK

*LSL constant*

```lsl
integer PSYS_PART_FOLLOW_VELOCITY_MASK = 0x20;
```

Particle flag causing particles to rotate and orient their vertical 'top' toward their direction of movement or emission. Otherwise, they remain vertically oriented with the top of the texture facing up.

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_FOLLOW_VELOCITY_MASK/