# setBufferOffset(offset:attributeStride:index:) Changes where the data begins and the distance between adjacent elements in a buffer already bound to the buffer argument table. ``` func setBufferOffset(offset: Int, attributeStride stride: Int, index: Int) ``` ## Parameters `offset` Where the data to bind begins, in bytes, from the start of the bound buffer. `stride` The number of bytes between the start of one element and the start of the next. `index` The index of the buffer to change in the argument table. ## Discussion> Important: > Only call this method when the buffer is part of ``doc://com.apple.metal/documentation/Metal/MTLComputePipelineDescriptor/stageInputDescriptor`` and has its stride set to ``doc://com.apple.metal/documentation/Metal/MTLBufferLayoutStrideDynamic``. _ _Prefer calling this method to unbinding and then rebinding data. For buffers binding to an argument using the `device` address space, align the offset to the data type’s size. The maximum size for an offset is `16` bytes. For buffers in the `constant` address space, the minimum alignment depends on the hardware running your app. See the [Metal feature set tables (PDF)](https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf) for information on each Apple GPU family. --- 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)