---
title: LowLevelMaterialResource.SimpleSurfaceDescriptor.OutputChannel
framework: realitykit
role: symbol
role_heading: Enumeration
path: realitykit/lowlevelmaterialresource/simplesurfacedescriptor/outputchannel-swift.enum
---

# LowLevelMaterialResource.SimpleSurfaceDescriptor.OutputChannel

The output channel that the simple surface shader writes to.

## Declaration

```swift
enum OutputChannel
```

## Topics

### Specifying output channels

- [LowLevelMaterialResource.SimpleSurfaceDescriptor.OutputChannel.baseColor](realitykit/lowlevelmaterialresource/simplesurfacedescriptor/outputchannel-swift.enum/basecolor.md)
- [LowLevelMaterialResource.SimpleSurfaceDescriptor.OutputChannel.emissiveColor](realitykit/lowlevelmaterialresource/simplesurfacedescriptor/outputchannel-swift.enum/emissivecolor.md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Escapable](swift/escapable.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Configuring the output

- [outputChannel](realitykit/lowlevelmaterialresource/simplesurfacedescriptor/outputchannel-swift.property.md)
- [outputOpacity](realitykit/lowlevelmaterialresource/simplesurfacedescriptor/outputopacity.md)