# copyCommands(sourceBuffer:sourceRange:destinationBuffer:destinationIndex:) Encodes a command that copies commands from one indirect command buffer into another. ``` func copyCommands(sourceBuffer: any MTLIndirectCommandBuffer, sourceRange: Range, destinationBuffer: any MTLIndirectCommandBuffer, destinationIndex: Int) ``` ## Parameters `sourceRange` The range of commands in `sourceBuffer` to copy. The copy operation requires that the source range starts at a valid execution point. `destinationIndex` An index in `destinationBuffer` into where the command copies content to. The copy operation requires that the destination index is a valid execution point with enough space left in `destinationBuffer` to accommodate `sourceRange.count` commands. --- 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)