# init(rawValue:) Creates a custom render layer with the specified runtime name. ``` init?(rawValue: String) ``` ## Parameters `rawValue` A unique name for this layer. ## Return Value A new render layer, or `nil` if `rawValue` is empty. ## Discussion Use this failable initializer when the layer name comes from a runtime string, such as user input or data loaded from a file. To define a layer constant from a string literal, use [`init(_:)`](/documentation/RealityKit/RenderLayer/init(_:)) instead. Use descriptive names with namespace prefixes such as `"com.myapp.hero"` or `"com.myapp.background"` to avoid conflicts with other layers. --- 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)