text: import { TangentSpaceNormalMap } from '../constants.js';
  import { Material } from './Material.js';
  import { Vector2 } from '../math/Vector2.js';
  
  /**
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
   *
   * parameters = {
   *  opacity: <float>,
   *
   *  bumpMap: new THREE.Texture( <Image> ),
   *  bumpScale: <float>,
   *
   *  normalMap: new THREE.Texture( <Image> ),
   *  normalMapType: THREE.TangentSpaceNormalMap,
   *  normalScale: <Vector2>,
   *
   *  displacementMap: new THREE.Texture( <Image> ),
   *  displacementScale: <float>,
   *  displacementBias: <float>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>,
   *  morphNormals: <bool>
   * }
   */
  
  function MeshNormalMaterial( parameters ) {
  
  	Material.call( this );
  
  	this.type = 'MeshNormalMaterial';
  
  	this.bumpMap = null;
  	this.bumpScale = 1;
  
  	this.normalMap = null;
  	this.normalMapType = TangentSpaceNormalMap;
  	this.normalScale = new Vector2( 1, 1 );
  
  	this.displacementMap = null;
  	this.displacementScale = 1;
  	this.displacementBias = 0;
  
  	this.wireframe = false;
  	this.wireframeLinewidth = 1;
  
  	this.fog = false;
  	this.lights = false;
  
  	this.skinning = false;
  	this.morphTargets = false;
  	this.morphNormals = false;
  
  	this.setValues( parameters );
  
  }
  
  MeshNormalMaterial.prototype = Object.create( Material.prototype );
  MeshNormalMaterial.prototype.constructor = MeshNormalMaterial;
  
  MeshNormalMaterial.prototype.isMeshNormalMaterial = true;
  
  MeshNormalMaterial.prototype.copy = function ( source ) {
  
  	Material.prototype.copy.call( this, source );
  
  	this.bumpMap = source.bumpMap;
  	this.bumpScale = source.bumpScale;
  
  	this.normalMap = source.normalMap;
  	this.normalMapType = source.normalMapType;
  	this.normalScale.copy( source.normalScale );
  
  	this.displacementMap = source.displacementMap;
  	this.displacementScale = source.displacementScale;
  	this.displacementBias = source.displacementBias;
  
  	this.wireframe = source.wireframe;
  	this.wireframeLinewidth = source.wireframeLinewidth;
  
  	this.skinning = source.skinning;
  	this.morphTargets = source.morphTargets;
  	this.morphNormals = source.morphNormals;
  
  	return this;
  
  };
  
  
  export { MeshNormalMaterial };
  