---
title: LitLightingModel.SpecularModel.ggx
framework: realitykit
role: symbol
role_heading: Case
path: realitykit/litlightingmodel/specularmodel-swift.enum/ggx
---

# LitLightingModel.SpecularModel.ggx

GGX (Trowbridge-Reitz) specular, a physically based microfacet model.

## Declaration

```swift
case ggx
```

## See Also

### Choosing a specular model

- [LitLightingModel.SpecularModel.anisotropicGGX](realitykit/litlightingmodel/specularmodel-swift.enum/anisotropicggx.md)
- [LitLightingModel.SpecularModel.blinnPhong](realitykit/litlightingmodel/specularmodel-swift.enum/blinnphong.md)
- [LitLightingModel.SpecularModel.sheen](realitykit/litlightingmodel/specularmodel-swift.enum/sheen.md)