three.js/examples/jsm/nodes/materials/MeshPhysicalNodeMaterial.js

import MeshStandardNodeMaterial from './MeshStandardNodeMaterial.js';

import { MeshPhysicalMaterial } from 'three';

const defaultValues = new MeshPhysicalMaterial();

export default class MeshPhysicalNodeMaterial extends MeshStandardNodeMaterial {

	constructor( parameters ) {

		super();

		this.isMeshPhysicalNodeMaterial = true;

		this.clearcoatNode = null;
		this.clearcoatRoughnessNode = null;
		this.clearcoatNormalNode = null;

		this.sheen = 0;
		this.clearcoat = 0;
		this.iridescence = 0;
		this.transmission = 0;

		this.setDefaultValues( defaultValues );

		this.setValues( parameters );

	}

	copy( source ) {

		this.clearcoatNode = source.clearcoatNode;
		this.clearcoatRoughnessNode = source.clearcoatRoughnessNode;
		this.clearcoatNormalNode = source.clearcoatNormalNode;

		return super.copy( source );

	}

}