# init(scale:texture:) Creates an object from a single value or a texture. ``` init(scale: Float = 1.0, texture: PhysicallyBasedMaterial.Texture? = nil) ``` ## Parameters `scale` A value from 0.0 to 1.0 to use as the specular value for the material. `texture` An optional UV-mapped image texture. ## Discussion RealityKit automatically draws *specular highlights* for physically based materials using the values of various properties, primarily [`roughness`](/documentation/RealityKit/PhysicallyBasedMaterial/roughness-swift.property) and [`metallic`](/documentation/RealityKit/PhysicallyBasedMaterial/metallic-swift.property). Specular highlights are bright spots of reflected light that appear on shiny objects. -1@2x.png) While many real-world objects can be accurately and realistically simulated with just the core PBR properties, you can create additional realistic effects by augmenting the specular highlights. This initializer creates a [`PhysicallyBasedMaterial.Specular`](/documentation/RealityKit/PhysicallyBasedMaterial/Specular-swift.struct) object from a single value, an image texture, or both. If you specify `texture`, RealityKit calculates the `specular` for the entity by UV-mapping `texture` onto the entity and multiplying the value of each mapped pixel by `scale`. If you don’t specify `texture`, RealityKit uses `scale` as the entire entity’s specular. If you provide a color image for `texture` rather than a grayscale image, RealityKit only uses the intensity of the image’s red channel. --- 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)