---
title: collision0
product: Unity Editor
version: '7000.0'
latest_version: '7000.0'
status: This page documents version 7000.0. The latest version is 7000.0.
canonical: https://docs.unity.com/en-us/engine/7000.0/script-reference/unityengine/particlesystem/subemittersmodule/collision0
latest_url: https://docs.unity.com/en-us/engine/7000.0/script-reference/unityengine/particlesystem/subemittersmodule/collision0.md
last_updated: 2026-10-07
generated_at: 2026-11-10T19:39:21.797Z
locale: en-us
---

# collision0

> Sub-Particle System which spawns at the locations of the collision of the particles from the parent system.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/7000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

> **Warning:**
>
> **Deprecated.** collision0 property is deprecated. Use AddSubEmitter, RemoveSubEmitter, SetSubEmitterSystem and GetSubEmitterSystem instead.

```csharp
public ParticleSystem collision0 { get; set; }
```

### Remarks

This module's Particle System uses the first set of emission burst properties to spawn a sub-Particle System. If the system does not contain burst properties, then the system emits nothing; if the system contains more than one set of burst properties, then it ignores the additional properties.