# boxThickness

> Thickness of the box to emit particles from.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.6/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

```csharp
public Vector3 boxThickness { get; set; }
```

### Remarks

When using edge and shell modes, this controls how far from the perimeter that Unity can generate particles. Additional Resources: [ParticleSystem.ShapeModule.shapeType](/engine/6000.6/script-reference/unityengine/particlesystem/shapemodule/shapetype.md).