# boundingBoxBuffers Configures a reference to a buffer where each entry contains a reference to a buffer of bounding boxes. ``` var boundingBoxBuffers: MTL4BufferRange { get set } ``` ## 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`](/documentation/Metal/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. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)