# RenderLayer.Set An unordered collection of unique render layers. ``` struct Set ``` ## Overview [`RenderLayer.Set`](/documentation/RealityKit/RenderLayer/Set) represents a group of layers - for example, the layers a light illuminates ([`layers`](/documentation/RealityKit/DirectionalLightComponent/layers), [`layers`](/documentation/RealityKit/PointLightComponent/layers), [`layers`](/documentation/RealityKit/SpotLightComponent/layers)) or the layers an entity participates in ([`layers`](/documentation/RealityKit/RenderLayerComponent/layers)). Create a [`RenderLayer.Set`](/documentation/RealityKit/RenderLayer/Set) using an array literal: ```swift let layers: RenderLayer.Set = [.defaultLayer, RenderLayer("com.myapp.hero")] ``` ## Topics ### Inspecting the set [`var count: Int`](/documentation/RealityKit/RenderLayer/Set/count) The number of layers in the set. [`var isEmpty: Bool`](/documentation/RealityKit/RenderLayer/Set/isEmpty) A Boolean value indicating whether the set contains no layers. [`func contains(RenderLayer) -> Bool`](/documentation/RealityKit/RenderLayer/Set/contains(_:)) Returns a Boolean value indicating whether the set contains the given layer. ### Initializers [`init()`](/documentation/RealityKit/RenderLayer/Set/init()) Creates an empty set of render layers. [`init(S)`](/documentation/RealityKit/RenderLayer/Set/init(_:)) Creates a set of render layers from a sequence. ### Instance Methods [`func insert(RenderLayer) -> (inserted: Bool, memberAfterInsert: RenderLayer)`](/documentation/RealityKit/RenderLayer/Set/insert(_:)) Inserts the given layer into the set. [`func remove(RenderLayer) -> RenderLayer?`](/documentation/RealityKit/RenderLayer/Set/remove(_:)) Removes the given layer from the set if it exists. ## Relationships ### Conforms To [`Sequence`](/documentation/Swift/Sequence) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Escapable`](/documentation/Swift/Escapable) [`Sendable`](/documentation/Swift/Sendable) [`Equatable`](/documentation/Swift/Equatable) [`ExpressibleByArrayLiteral`](/documentation/Swift/ExpressibleByArrayLiteral) [`Copyable`](/documentation/Swift/Copyable) --- 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)