KHRMaterialsTransmission

KHR_materials_transmission provides a common type of optical transparency: infinitely-thin materials with no refraction, scattering, or dispersion.

Figure: Sphere using KHR_materials_transmission with varying roughness (0.0, 0.2, 0.4). Source: Khronos Group.

While default PBR materials using alpha blending become invisible as their opacity approaches zero, a transmissive material continues to reflect light in a glass-like manner, even at low transmission values. When combined with KHRMaterialsVolume, transmission may be used for thicker materials and refractive effects.

Properties:

• Transmission

Example

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

import { KHRMaterialsTransmission, Transmission } from '@gltf-transform/extensions';

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

// Create a Transmission property.
const transmission = transmissionExtension.createTransmission()
    .setTransmissionFactor(1.0);

// Attach the property to a Material.
material.setExtension('KHR_materials_transmission', transmission);