---
title: LitLightingModel.DiffuseModel.orenNayar
framework: realitykit
role: symbol
role_heading: Case
path: realitykit/litlightingmodel/diffusemodel-swift.enum/orennayar
---

# LitLightingModel.DiffuseModel.orenNayar

Oren-Nayar diffuse, a roughness-aware model suited to matte surfaces.

## Declaration

```swift
case orenNayar
```

## See Also

### Choosing a diffuse model

- [LitLightingModel.DiffuseModel.lambertian](realitykit/litlightingmodel/diffusemodel-swift.enum/lambertian.md)
- [LitLightingModel.DiffuseModel.hammon](realitykit/litlightingmodel/diffusemodel-swift.enum/hammon.md)