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# CustomMaterial.LightingModel.lit

The entity renders using physically based rendering techniques
without a clearcoat.

```
case lit
```

## Discussion

A custom material using the
[`CustomMaterial.LightingModel.lit`](/documentation/RealityKit/CustomMaterial/LightingModel-swift.enum/lit) lighting model uses
physically based rendering techniques, but doesn’t render a
clearcoat. If a [`CustomMaterial.LightingModel.lit`](/documentation/RealityKit/CustomMaterial/LightingModel-swift.enum/lit)
material’s surface shader calls `params.surface().set_clearcoat()`
or `params.surface().set_clearcoat_roughness(),` ReallityKit ignores
it.

---

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