---
title: fractionPerNegativeEdge
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/clippingprimitivecomponent/feather-swift.struct/fractionpernegativeedge
---

# fractionPerNegativeEdge

Feather interval over which opacity lerps to 0 for negative edges (i.e -X, -Y, -Z) of the clip bounds. Expressed as a fraction of the smallest dimension of the clipping volume Values range from 0.0 to 1.0:

## Declaration

```swift
var fractionPerNegativeEdge: SIMD3<Float>
```

## Discussion

Discussion 0.0 means no feathering on that edge 0.1 means fade across 10% of the bounding box dimension in the negative axes 1.0 means the feather zone extends across the entire negative box dimension

## See Also

### Configuring the feather effect

- [falloff](realitykit/clippingprimitivecomponent/feather-swift.struct/falloff-swift.property.md)
- [ClippingPrimitiveComponent.Feather.Falloff](realitykit/clippingprimitivecomponent/feather-swift.struct/falloff-swift.enum.md)
- [fractionPerPositiveEdge](realitykit/clippingprimitivecomponent/feather-swift.struct/fractionperpositiveedge.md)