# useResources:count:usage: Specifies that an array of resources in an argument buffer can be safely used by the acceleration structure pass. ``` - (void) useResources:(id const[]) resources count:(NSUInteger) count usage:(MTLResourceUsage) usage; ``` ## Parameters `resources` An array of resources within an argument buffer. `count` The number of resource elements in `resources`. `usage` Options that indicate how a GPU function accesses each resource in `resources`. ## Discussion This method makes the array of resources resident for the duration of a compute pass and ensures that it’s in a format compatible with the compute function. Call this method before issuing any dispatch calls that may access the array of resources. Calling this method again, or calling [`useHeap(_:)`](/documentation/Metal/MTLComputeCommandEncoder/useHeap(_:)), overwrites any previously specified usage options for future dispatch calls within the same compute command encoder. > Note: > You can track resource access and dependency hazards with ``doc://com.apple.metal/documentation/Metal/MTLFence`` instances. --- 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)