# materials

> The materials the ray tracing instances use.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.Rendering](/engine/6000.6/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public Material[] materials { readonly get; set; }
```

### Remarks

Check [RayTracingAccelerationStructure.AddInstancesIndirect](/engine/6000.6/script-reference/unityengine/rendering/raytracingaccelerationstructure/addinstancesindirect.md) method for additional information regarding how to specify ray tracing instance data that reference materials from this array.