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

# init()

Creates an acceleration sizes instance with default values.

## Declaration

```swift
init()
```

## See Also

### Creating an acceleration size structure

- [init(accelerationStructureSize:buildScratchBufferSize:refitScratchBufferSize:)](metal/mtlaccelerationstructuresizes/init(accelerationstructuresize:buildscratchbuffersize:refitscratchbuffersize:).md)