---
title: interfaceIndexOfRefraction
framework: modelio
role: symbol
role_heading: Instance Property
path: modelio/mdlscatteringfunction/interfaceindexofrefraction
---

# interfaceIndexOfRefraction

The index of refraction for a material itself.

## Declaration

```swift
var interfaceIndexOfRefraction: MDLMaterialProperty { get }
```

## Discussion

Discussion This value corresponds to the n2 parameter in Schlick’s equation for approximating Fresnel reflection effects. The default value is 1.0.

## See Also

### Working with Shading Properties

- [baseColor](modelio/mdlscatteringfunction/basecolor.md)
- [emission](modelio/mdlscatteringfunction/emission.md)
- [specular](modelio/mdlscatteringfunction/specular.md)
- [materialIndexOfRefraction](modelio/mdlscatteringfunction/materialindexofrefraction.md)
- [normal](modelio/mdlscatteringfunction/normal.md)
- [ambientOcclusion](modelio/mdlscatteringfunction/ambientocclusion.md)
- [ambientOcclusionScale](modelio/mdlscatteringfunction/ambientocclusionscale.md)