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

# emission

The color emitted as radiance from a material’s surface.

## Declaration

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

## Discussion

Discussion A renderer (or other software component processing the material) might not treat the emission channel of a material as a light source illuminating the scene. Instead, an emission channel prevents affected areas of a surface from being darkened by other aspects of lighting and shading. The default emission color is light gray (80% white).

## See Also

### Working with Shading Properties

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