# slice(unsafeBuffer:offset:size:bytesPerRow:) Specifies a single mipmap level slice of a texture resource with pixel data that RealityKit copies from a Metal buffer. ``` static func slice(unsafeBuffer buffer: any MTLBuffer, offset: Int = 0, size: Int, bytesPerRow: Int) -> TextureResource.Contents.Slice ``` ## Parameters `buffer` The source buffer. Don’t modify this buffer while using it as the source of a copy operation. `offset` The byte position in the source buffer where the copying starts. The offset needs to be a multiple of the destination texture’s pixel size, in bytes. `size` The number of bytes in the source buffer (starting from `offset`) available for copying. `bytesPerRow` The stride in bytes between rows of texture data that RealityKit stores in the source buffer. The value needs to be a multiple of the destination texture’s pixel size, in bytes. ## Discussion> Important: A ``doc://com.apple.RealityKit/documentation/RealityKit/TextureResource/Contents/Slice`` that you create with this function and use to create a ``doc://com.apple.RealityKit/documentation/RealityKit/TextureResource`` > copies from the source buffer. That copy occurs when initializing the texture resource. The caller > is responsible for ensuring that the system doesn’t modify the source Metal buffer while copying it to a texture. --- 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)