---
title: init()
framework: metal
role: symbol
role_heading: Initializer
path: metal/mtlaccelerationstructureinstancedescriptor/init()
---

# init()

Creates a default acceleration structure instance.

## Declaration

```swift
init()
```

## See Also

### Creating an instance descriptor

- [init(transformationMatrix:options:mask:intersectionFunctionTableOffset:accelerationStructureIndex:)](metal/mtlaccelerationstructureinstancedescriptor/init(transformationmatrix:options:mask:intersectionfunctiontableoffset:accelerationstructureindex:).md)