---
title: boundingBoxBuffers
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtl4accelerationstructuremotionboundingboxgeometrydescriptor/boundingboxbuffers
---

# boundingBoxBuffers

Configures a reference to a buffer where each entry contains a reference to a buffer of bounding boxes.

## Declaration

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

## Discussion

Discussion This property references a buffer that conceptually represents an array with one entry for each keyframe in the motion animation. Each one of these entries consists of a MTL4BufferRange that, in turn, references a vertex buffer containing the bounding box data for the keyframe. You are responsible for ensuring the buffer address is not zero for the top-level buffer, as well as for all the vertex buffers it references.