# Unlit Surface (RealityKit) A surface shader that defines properties for a RealityKit Unlit material. ## Parameter Types |Input |Type | |-----------------------------|-------------| |`Color` |Color3| |`Opacity` |Float | |`Opacity Threshold` |Float | |`Apply Post Process Tone Map`|Bool | |`Has Premultiplied Alpha` |Bool | |Output|Type | |------|-----| |`Out` |Token| ## Parameter descriptions - `Color`: The base color of the surface. - `Opacity`: The level of opaqueness of the surface. If the value of this parameter is `1.0`, the surface is fully opaque. If the value is less than `1.0`, the surface appears translucent. If the value is `0`, the surface is completely transparent. The default value is `1.0`. - `Opacity Threshold`: The threshold for whether the node renders a portion of the surface based on its opacity level. A value of `0.0` means that no additional masking occurs. If the value is greater than `0.0`, the node renders only areas of the surface with an `Opacity` value greater than the value of this parameter. This parameter can be turned on or off. The default value is `0.0`. - `Apply Post Process Tone Map`: A Boolean value that tells the node whether to apply the post process tone map. - `Has Premultiplied Alpha`: A Boolean value that tells the node if it has a premultiplied alpha. ## Discussion The `Unlit Surface` node produces a custom surface based on its input parameters. Connect the output of the `Unlit Surface` node connect to the `Custom Surface` output of your material. --- 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)