import { Extension, type ReaderContext, type WriterContext } from '@gltf-transform/core';
import { KHR_MATERIALS_DIFFUSE_TRANSMISSION } from '../constants.js';
import { DiffuseTransmission } from './diffuse-transmission.js';
/**
 * [KHR_materials_diffuse_transmission](https://github.com/KhronosGroup/gltf/blob/main/extensions/2.0/Khronos/KHR_materials_diffuse_transmission/)
 * defines diffuse transmission on a glTF PBR material.
 *
 * ![Illustration](/media/extensions/khr-materials-diffuse-transmission.png)
 *
 * > _**Figure:** Sphere using `KHR_materials_diffuse_transmission` with varying roughness (0.0, 0.2, 0.4).
 * > Source: Khronos Group._
 *
 * Adds a Lambertian diffuse transmission BSDF to the metallic-roughness
 * material. Thin, dielectric objects like leaves or paper diffusely transmit
 * incoming light to the opposite side of the surface. For optically thick
 * media (volumes) with short scattering distances and therefore dense
 * scattering behavior, a diffuse transmission lobe is a phenomenological
 * plausible and cheap approximation.
 *
 * Properties:
 * - {@link DiffuseTransmission}
 *
 * ### Example
 *
 * ```typescript
 * import { KHRMaterialsDiffuseTransmission, DiffuseTransmission } from '@gltf-transform/extensions';
 *
 * // Create an Extension attached to the Document.
 * const diffuseTransmissionExtension = document.createExtension(KHRMaterialsDiffuseTransmission);
 *
 * // Create DiffuseTransmission property.
 * const diffuseTransmission = diffuseTransmission.createDiffuseTransmission()
 *	.setDiffuseTransmissionFactor(1.0);
 *
 * // Assign to a Material.
 * material.setExtension('KHR_materials_diffuse_transmission', diffuseTransmission);
 * ```
 *
 * @experimental KHR_materials_diffuse_transmission is not yet ratified by the Khronos Group.
 */
export declare class KHRMaterialsDiffuseTransmission extends Extension {
    readonly extensionName: typeof KHR_MATERIALS_DIFFUSE_TRANSMISSION;
    static readonly EXTENSION_NAME: typeof KHR_MATERIALS_DIFFUSE_TRANSMISSION;
    /** Creates a new DiffuseTransmission property for use on a {@link Material}. */
    createDiffuseTransmission(): DiffuseTransmission;
    /** @hidden */
    read(context: ReaderContext): this;
    /** @hidden */
    write(context: WriterContext): this;
}