three.js/src/materials/MeshNormalMaterial.js

/**
 * @author mr.doob / http://mrdoob.com/
 *
 * parameters = {
 *  opacity: <float>,
 
 *  shading: THREE.FlatShading,
 *  blending: THREE.NormalBlending,
 *  depthTest: <bool>,
 
 *  wireframe: <boolean>,
 *  wireframeLinewidth: <float>
 * }
 */

THREE.MeshNormalMaterial = function ( parameters ) {

	THREE.Material.call( this, parameters );

	parameters = parameters || {};

	this.shading = parameters.shading ? parameters.shading : THREE.FlatShading;

	this.wireframe = parameters.wireframe ? parameters.wireframe : false;
	this.wireframeLinewidth = parameters.wireframeLinewidth ? parameters.wireframeLinewidth : 1;

};

THREE.MeshNormalMaterial.prototype = Object.create( THREE.Material.prototype );