---
title: sampleBuffer
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlaccelerationstructurepasssamplebufferattachmentdescriptor/samplebuffer
---

# sampleBuffer

A specialized memory buffer that the GPU uses to store its counter data during the acceleration structure pass.

## Declaration

```swift
var sampleBuffer: (any MTLCounterSampleBuffer)? { get set }
```

## Mentioned in

Sampling GPU data into counter sample buffers

## Discussion

Discussion The property defaults to nil, which means the GPU doesn’t save any GPU counter information during the acceleration structure pass. See Creating a counter sample buffer to store a GPU’s counter data during a pass and Sampling GPU data into counter sample buffers for more information.