KHR_materials_sheen defines a velvet-like sheen layered on a glTF PBR material.

Figure: A cushion, showing high material roughness and low sheen roughness. Soft highlights at edges of the material show backscattering from microfibers. Source: Khronos Group.

A sheen layer is a common technique used in Physically-Based Rendering to represent cloth and fabric materials.

Properties:

• Sheen

Example

The MaterialsSheen class provides a single ExtensionProperty type, Sheen, which may be attached to any Material instance. For example:

import { MaterialsSheen, Sheen } from '@gltf-transform/extensions';

// Create an Extension attached to the Document.
const sheenExtension = document.createExtension(MaterialsSheen);

// Create a Sheen property.
const sheen = sheenExtension.createSheen()
    .setSheenColorFactor([1.0, 1.0, 1.0]);

// Attach the property to a Material.
material.setExtension('KHR_materials_sheen', sheen);