---
title: falloffStart
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/clothforcevolumecomponent/falloffstart
---

# falloffStart

The depth (in meters) inside the volume at which the total force starts to linearly fall off.

## Declaration

```swift
var falloffStart: Float { get set }
```

## Discussion

Discussion For particles whose depth is greater than or equal to falloffStart, the full force is applied. For shallower particles, the force ramps linearly from zero at the volume surface to the full force at falloffStart. Must be non-negative; negative values are clamped to zero. Zero by default, which means the total force is fully applied to all intersecting particles.

## See Also

### Shaping the volume

- [shape](realitykit/clothforcevolumecomponent/shape.md)