---
title: program
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/portalmaterial/program-swift.property
---

# program

The compiled program that defines this material’s shading behavior.

## Declaration

```swift
var program: PortalMaterial.Program { get set }
```

## See Also

### Specifying the shader program

- [PortalMaterial.Program](realitykit/portalmaterial/program-swift.struct.md)