/**
 * @author mrdoob / http://mrdoob.com/
 * @author alteredq / http://alteredqualia.com/
 */

THREE.DirectionalLight = function ( color, intensity ) {

	THREE.Light.call( this, color );

	this.type = 'DirectionalLight';

	this.position.set( 0, 1, 0 );
	this.target = new THREE.Object3D();

	this.intensity = ( intensity !== undefined ) ? intensity : 1;

	this.castShadow = false;
	this.onlyShadow = false;

	//

	this.shadowCameraNear = 50;
	this.shadowCameraFar = 5000;

	this.shadowCameraLeft = - 500;
	this.shadowCameraRight = 500;
	this.shadowCameraTop = 500;
	this.shadowCameraBottom = - 500;

	this.shadowCameraVisible = false;

	this.shadowBias = 0;
	this.shadowDarkness = 0.5;

	this.shadowMapWidth = 512;
	this.shadowMapHeight = 512;

	//

	this.shadowCascade = false;

	this.shadowCascadeOffset = new THREE.Vector3( 0, 0, - 1000 );
	this.shadowCascadeCount = 2;

	this.shadowCascadeBias = [ 0, 0, 0 ];
	this.shadowCascadeWidth = [ 512, 512, 512 ];
	this.shadowCascadeHeight = [ 512, 512, 512 ];

	this.shadowCascadeNearZ = [ - 1.000, 0.990, 0.998 ];
	this.shadowCascadeFarZ  = [ 0.990, 0.998, 1.000 ];

	this.shadowCascadeArray = [];

	//

	this.shadowMap = null;
	this.shadowMapSize = null;
	this.shadowCamera = null;
	this.shadowMatrix = null;

};

THREE.DirectionalLight.prototype = Object.create( THREE.Light.prototype );
THREE.DirectionalLight.prototype.constructor = THREE.DirectionalLight;

THREE.DirectionalLight.prototype.clone = function () {

	var light = new THREE.DirectionalLight();

	THREE.Light.prototype.clone.call( this, light );

	light.target = this.target.clone();

	light.intensity = this.intensity;

	light.castShadow = this.castShadow;
	light.onlyShadow = this.onlyShadow;

	//

	light.shadowCameraNear = this.shadowCameraNear;
	light.shadowCameraFar = this.shadowCameraFar;

	light.shadowCameraLeft = this.shadowCameraLeft;
	light.shadowCameraRight = this.shadowCameraRight;
	light.shadowCameraTop = this.shadowCameraTop;
	light.shadowCameraBottom = this.shadowCameraBottom;

	light.shadowCameraVisible = this.shadowCameraVisible;

	light.shadowBias = this.shadowBias;
	light.shadowDarkness = this.shadowDarkness;

	light.shadowMapWidth = this.shadowMapWidth;
	light.shadowMapHeight = this.shadowMapHeight;

	//

	light.shadowCascade = this.shadowCascade;

	light.shadowCascadeOffset.copy( this.shadowCascadeOffset );
	light.shadowCascadeCount = this.shadowCascadeCount;

	light.shadowCascadeBias = this.shadowCascadeBias.slice( 0 );
	light.shadowCascadeWidth = this.shadowCascadeWidth.slice( 0 );
	light.shadowCascadeHeight = this.shadowCascadeHeight.slice( 0 );

	light.shadowCascadeNearZ = this.shadowCascadeNearZ.slice( 0 );
	light.shadowCascadeFarZ  = this.shadowCascadeFarZ.slice( 0 );

	return light;

};