---
title: boundingBoxCount
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtl4accelerationstructuremotionboundingboxgeometrydescriptor/boundingboxcount
---

# boundingBoxCount

Declares the number of bounding boxes in each buffer that boundingBoxBuffer references.

## Declaration

```swift
var boundingBoxCount: Int { get set }
```

## Discussion

Discussion All keyframes share the same bounding box count.