---
title: "subscript(_:)"
framework: metal
role: symbol
role_heading: Instance Subscript
path: "metal/mtlaccelerationstructurepasssamplebufferattachmentdescriptorarray/subscript(_:)"
---

# subscript(_:)

## Declaration

```swift
subscript(attachmentIndex: Int) -> MTLAccelerationStructurePassSampleBufferAttachmentDescriptor! { get set }
```