# init(value:texture:) Creates a custom object from a vector and texture. ``` init(value: SIMD4 = .init(repeating: 0), texture: CustomMaterial.Texture? = nil) ``` ## Parameters `value` A four-component vector. `texture` An optional texture. ## Discussion Use this initializer to create a new [`CustomMaterial.Custom`](/documentation/RealityKit/CustomMaterial/Custom-swift.struct) object from a four-component vector, a texture, or both. RealityKit passes these values automatically to your custom material’s shader functions. Custom values have no predefined meaning, and RealityKit doesn’t use them other than to make them available in your surface shader and geometry modifier. --- 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)