# fill(buffer:range:value:) Encodes a command that fills a buffer with a constant value for each byte. ``` func fill(buffer: any MTLBuffer, range: Range, value: UInt8) ``` ## Parameters `buffer` A MTLBuffer instance the command assigns each byte in range to value. `range` A range of bytes within the buffer the command assigns value to. The range’s count property needs to be greater than 0. `value` The value to write to each byte. --- 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)