# Particles

CPU ParticleEmitter: sub-emitters, collision, trails, and deterministic seeding.

```{raw} html
<a class="example-run-button" href="../demos/features_3d_particles.html">▶ Run in browser</a>

```

**Tags:** `3d`

For compute-shader GPU particles see ``gpu_particles.py``.


Demonstrates:
  - Firework: upward burst, sub_emitter_death creates sparkle explosion
  - Waterfall: particles fall and bounce off ground plane
  - Comet: moving emitter with trail rendering
  - Deterministic toggle: press R to restart with same seed, proving identical replay

Run: uv run python examples/features/3d/particles.py

Controls:
    1       - Firework burst
    2       - Toggle waterfall
    3       - Toggle comet
    R       - Restart all (deterministic replay)
    A / D   - Orbit camera
    W / S   - Zoom in / out

## Source

```{literalinclude} ../../examples/features/3d/particles.py
:language: python
:linenos:
```