# init(componentNoises:selectionNoise:) Creates a noise object by combining the specified noise objects, using another noise object to select which regions of the output correspond to which input noise. ``` convenience init(componentNoises noises: [GKNoise], selectionNoise: GKNoise) ``` ## Parameters `noises` The array of noise objects to combine. `selectionNoise` A noise object whose values determine which object from the `noises` array contributes to which region of the generated output. ## Return Value A new noise object. ## Discussion This method is equivalent to the [`init(componentNoises:selectionNoise:componentBoundaries:boundaryBlendDistances:)`](/documentation/GameplayKit/GKNoise/init(componentNoises:selectionNoise:componentBoundaries:boundaryBlendDistances:)) method, but automatically determines uniformly spaced boundaries based on the number of noise objects in the `noises` array, and using a blend distance of zero for each boundary. Together with these boundaries, the `selectionNoise` parameter determines which of the input noise objects appears in which region of generated noise. For example, if the `noises` array contains two noise objects, the boundary value is zero: In regions where the `selectionNoise` field has negative values, the noise created by this method uses values from the first element of the `noises` array, and in regions where the `selectionNoise` field has positive values, the created noise uses values from the second element in the `noises` array.  --- 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)