---
title: instanceCountBuffer
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtl4indirectinstanceaccelerationstructuredescriptor/instancecountbuffer
---

# instanceCountBuffer

Provides a reference to a buffer containing the number of instances in the instance descriptor buffer, formatted as a 32-bit unsigned integer.

## Declaration

```swift
var instanceCountBuffer: MTL4BufferRange { get set }
```

## Discussion

Discussion You are responsible for ensuring that the final number of instances at build time, which you provide indirectly via this buffer reference , is less than or equal to the value of property maxInstanceCount.