---
title: lightingBlendDistance
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/portalcomponent/lightingblenddistance
---

# lightingBlendDistance

The lighting blend distance from the clipping/crossing plane.

## Declaration

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

## Discussion

Discussion This property controls the smooth blending between outside world environment probe lighting and portal world environment probe lighting for crossing entities. The blend is calculated based on fragment distance to the portal surface as defined by the crossing modes. Behavior: Value 0: Sharp lighting transition at portal boundary Positive values: Smooth gradient over the specified distance in meters Distance calculation: Uses the SDF (Signed Distance Field) from crossing geometry Plane mode: Distance to plane or cylindrical surface Volume mode: Distance to box boundary note: Only functional when crossing mode is enabled and target world uses blend lighting mode.